Engine Controls - Tests W/codes Dodge Ram Van B3500

MODEL IDENTIFICATION

Vehicle body codes are used throughout self-diagnostic tests. See BODY CODE DESIGNATION table for model identification.

BODY CODE DESIGNATION

INTRODUCTION

Perform all steps in appropriate BASIC DIAGNOSTIC PROCEDURES article. If no faults are found while performing basic diagnostic procedures, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes (system functioning properly) are found during self-diagnostics, proceed to TEST NTC-1A: NO TROUBLE CODE TEST MENU , or TROUBLE SHOOTING - NO CODES - GASOLINE article for diagnosis by symptom.

SYSTEM DIAGNOSTICS

Note. If MIL does not come on for 2-3 seconds and then go off, bulb may be defective, or problem may exist on circuit (CCD Bus) between Powertrain Control Module (PCM) and instrument cluster. If problem exists with CCD Bus, this problem may be displayed when using scan tool to retrieve DTCs.

Malfunction Indicator Light (MIL)

MIL may also be referred to as CHECK ENGINE light. MIL is located in instrument panel. When ignition is first turned on, MIL should come on and remain on for 2-3 seconds to verify bulb and circuit operation, and then go off.

PCM monitors several different engine control system circuits. PCM is located in engine compartment. See PCM LOCATION table. If a malfunction occurs which affects vehicle emissions, a Diagnostic Trouble Code (DTC) is stored in PCM and PCM enters limp-in mode. In limp-in mode, PCM substitutes values for failed component to continue engine operation, but loss of good driveability may result. When DTC is stored in PCM, PCM will turn on MIL and MIL will remain on steady.

If PCM detects active engine misfire severe enough to cause catalytic converter damage, MIL will immediately turn on to warn driver of possible damage and DTC will be stored. On manual transmission vehicles, MIL will either flash or light continuously during an active engine misfire. On all vehicles, PCM will turn off MIL when malfunction is not detected during 3 consecutive engine misfire or fuel system monitor tests. PCM performs engine misfire and fuel system monitor tests within predetermined engine speed (RPM) and load operating conditions. MIL may be turned off by PCM, however, a DTC may remain stored depending on type of malfunction detected.

PCM LOCATION

Note. For additional information about engine misfire and fuel system monitoring, see ON-BOARD DIAGNOSTICS.

On-Board Diagnostics

Powertrain Control Module (PCM) monitors several different engine control system circuits. If malfunction occurs, PCM will store a Diagnostic Trouble Code (DTC) when malfunction is detected, and PCM will enter limp-in mode. In limp-in mode, PCM substitutes values for failed component to continue engine operation, but loss of good driveability may result.

PCM contains electronic circuit monitors that monitor fuel, vehicle emissions, engine and ignition system performance. Monitors use information from various sensor circuits for system monitoring. Monitors do not indicate a specific component failure, but indicate an implied failure within a specified system, and that problem must be diagnosed. If any monitor detects a problem affecting vehicle emissions, a DTC will be stored in PCM. The following monitors are used

1. Engine Misfire Monitor
2. Fuel System Monitor
3. Oxygen Sensor Monitor
4. Oxygen Sensor Heater Monitor
5. Catalyst Monitor
6. EVAP System Leak Detection Monitor

MIL may be turned off by PCM, however, a DTC may remain stored depending on type of malfunction detected. To erase DTCs, see CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM. Once MIL is turned off, PCM must not detect recent malfunction during 40 run/stop engine cycles with engine coolant temperature at least 160°F (71.1°C) on normal operation, or 80 run/stop engine cycles with engine coolant temperature at least 160°F (71.1°C) on engine misfire or fuel system monitor.

PCM also records and stores engine operating conditions when malfunction occurred. This information is referred to as freeze frame data. If malfunction is an engine misfire or fuel system rich or fuel system lean, freeze frame data will be updated with most current information regarding these failures. Freeze frame data recorded is

1. Fuel System Status (Closed Or Open Loop)
2. Load Value (Displayed As Percent)
3. Engine Coolant Temperature
4. Short Term Adaptive (Displayed As Percent)
5. Long Term Adaptive (Displayed As Percent)
6. MAP Vacuum
7. Engine RPM
8. Vehicle Speed Sensor
9. DTC Causing Freeze Frame During Data Recording
10. Freeze Frame Priority

DTCs may be retrieved for system diagnosis by using scan tool only. See RETRIEVING DTCS under SELF-DIAGNOSTIC SYSTEM. By using scan tool, self-diagnostic capabilities of this system can simplify testing and reduce diagnostic time. Erasing DTCs also erases freeze frame data. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM. System malfunctions are identified as either hard failures or intermittent failures.

Hard Failures

Hard failures cause MIL to illuminate and remain on until problem is repaired. If MIL comes on and remains on during vehicle operation, cause of malfunction must be determined by retrieving DTCs. See RETRIEVING DTCS under SELF-DIAGNOSTIC SYSTEM. If a sensor fails, PCM will use substitute value in its calculations to continue engine operation. In this condition, commonly known as limp-in mode, vehicle runs but driveability will not be optimum.

Intermittent Failures

Intermittent failures may cause MIL to flicker or illuminate and go out after intermittent failure goes away. However, corresponding DTC will be retained in PCM memory. If related failure does not return within a certain time frame, related DTC will be erased from PCM memory. Intermittent failures may be caused by a sensor, connector or wiring related problems. See INACTIVE DTC CONDITION .

SERVICE PRECAUTIONS

Before proceeding with system diagnosis, following precautions must be followed

1. Ensure fuel pressure is released before removing fuel line or fittings, as fuel system is under pressure and may cause personal injury. See «FUEL PRESSURE RELEASE»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__fuel-pressure-release) .
2. When using self-diagnostic for diagnosis, DO NOT skip any steps, or incorrect diagnosis may result. Always perform indicated Verification (VER) test after repairs are made.
3. When using a jumper wire, ensure either jumper wire or circuit is fuse-protected.
4. Ensure ignition is off before disconnecting connector from any control module.
5. When checking voltage or continuity at any control module, probe connector for control module from pin side. DO NOT probe wire through insulation or backprobe connector (unless instructed to do otherwise in test procedure).
6. DO NOT cause short circuits when performing electrical tests. This will set additional Diagnostic Trouble Codes (DTCs), making diagnosis of original problem more difficult.
7. Use specified test equipment when performing electrical tests.
8. When checking for spark, ensure no fuel leaks exist and spark plug cable or coil wire is NOT more than 1/4" from engine ground. If spark plug or coil wire is more than 1/4" from engine ground, damage to vehicle electronics and/or Powertrain Control Module (PCM) may result.
9. DO NOT prolong testing of fuel injectors or engine may hydrostatically lock.
10. If replacing PCM, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent DTCs from being set in Anti-lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. See POWERTRAIN CONTROL MODULE PROGRAMMING.
11. If replacing PCM on models with a Sentry Key Immobilizer Module (Skim), secret key data must be updated to enable engine starting. To update secret key data, see POWERTRAIN CONTROL MODULE PROGRAMMING.

POWERTRAIN CONTROL MODULE PROGRAMMING

Connect scan tool to Data Link Connector (DLC). DLC is located below instrument panel near steering column. (Scheme 8) On models with Smart Key Immobilizer Module (SKIM), go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from the manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from SKIM to PCM. On all models, use scan tool to enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, erase DTCs from ABS and SRS modules.

Scheme 8

DIAGNOSTIC PROCEDURE

If no faults were found while performing procedures in BASIC DIAGNOSTICS PROCEDURES article, proceed with self-diagnostics. Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION. Retrieve DTCs using scan tool only. See RETRIEVING DTCS.

VISUAL INSPECTION

Most engine control system driveability problems result from faulty wiring, poor electrical connections, improper wire routing, or leaking air and vacuum hose connections. Inspect all engine control system components, hoses, connectors and wiring for damage before proceeding with system testing.

RETRIEVING DTCS

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box-III (DRB-III) scan tool. If using a generic scan tool, ensure scan tool is OBD-II certified. A generic scan tool may not be capable of performing all necessary test functions.

Note. If MIL does not come on for 3 seconds and then go off, bulb may be defective, or problem may exist on circuit (CCD Bus) between PCM and instrument cluster. If problem exists with CCD Bus, this problem may be displayed when using scan tool to retrieve DTCs.

Note. Ensure battery is fully charged before proceeding with test.

1. Attempt to start engine. Turn ignition off. Diagnostic Trouble Codes (DTCs) can only be retrieved using scan tool. Connect scan tool to Data Link Connector (DLC). DLC is located below instrument panel near steering column. (Scheme 8)
2. Turn ignition on, with engine off. Using scan tool manufacturer's instructions, read and record DTC (generic scan tool) or DTC message (DRB-III scan tool), and freeze frame data.
3. If scan tool displays NO RESPONSE, perform «TEST NS-SEL: NO START SELECTION MENU»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-sel-no-start-selection-menu). If scan tool will not power up, check for loose cable connections or bad cable. If cable connections and cable are okay, check voltage on DLC power terminal. See appropriate wiring diagram in WIRING DIAGRAMS article. Voltage should be at least 11 volts. If voltage is not as specified, check wiring circuit and necessary fuses.
4. If scan tool displays USER-REQUESTED COLD BOOT ERROR or USER-REQUESTED WARM BOOT ERROR, or any other error message, record entire displayed error message and follow scan tool manufacturer's instructions for information on correcting error.
5. If scan tool displays BUS FAILURE, indicating either a scan tool or BUS circuit failure, to diagnose and correct these conditions, see «VEHICLE COMMUNICATIONS»(/dodge/ram-van-b3500/1999-1999/remont/body-cab-control-systems/#vehicle-communications) article in ACCESSORIES & EQUIPMENT.
6. If DTCs are displayed, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. Once all repairs are made, ensure DTCs are erased from PCM memory. See CLEARING DTCS. If no DTCs are displayed, refer to one of the following: For driveability problems, perform «TEST NTC-1A: NO TROUBLE CODE TEST MENU»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ntc-1a-no-trouble-code-test). For no-start problems, perform «TEST NS-SEL: NO START SELECTION MENU»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-sel-no-start-selection-menu). For speed control problems and servicing information, see appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT. For charging system problems, see «GENERATORS & REGULATORS -- TRUCKS & RWD VANS»(/dodge/ram-van-b3500/1999-1999/remont/charging-system/#charging-system-generators-regulators) article in STARTING & CHARGING SYSTEMS.

Note. Not all DTCs listed in DTC MESSAGES & CODES table are used on all models.

DTC MESSAGES & CODES (1)

CLEARING DTCS

Ensure ignition is off, then turn ignition on, with engine off. Using scan tool manufacturer's instructions, erase DTCs from PCM memory.

INACTIVE DTC CONDITION

This procedure applies if you have been sent here from self-diagnostic tests and have just attempted to simulate condition that initially set DTC. The following additional checks may assist in identifying a possible intermittent problem

1. Visually inspect related component connectors for broken, bent, pushed-out or corroded terminals.
2. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals.
3. Visually inspect related wiring harnesses for chafed, pierced or partially broken wires.
4. Check for pertinent Technical Service Bulletins (TSBs) relating to the problem.

FUEL PRESSURE RELEASE

VEHICLES WITH FUEL RAIL TEST PORT

Loosen fuel cap. Ensure ignition is off. Remove protective cap from fuel rail test port. Place one end of Fuel Pressure Release Hose (C-4799-1) into an approved fuel container. Attach remaining end of hose to fuel rail test port. Use care, as fuel system may be under pressure. Fuel pressure will be released from fuel system. Remove hose, reinstall protective cap, and fuel cap. Wait 5 seconds. Use care when disconnecting fuel lines, as some fuel pressure may still exist in fuel lines.

VEHICLES WITHOUT FUEL RAIL TEST PORT

1. Remove fuel pump relay from Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Start and run engine until it stalls. Attempt to start engine. Continue restarting engine until it will no longer run. Turn ignition off. CAUTION: DO NOT supply power to fuel injector for more than 4 seconds, or fuel injector may be damaged.
2. Disconnect any fuel injector connector. Connect a jumper wire between either fuel injector terminal and positive battery terminal. Connect another jumper wire to other fuel injector terminal. Momentarily touch other end of jumper wire to negative battery terminal.
3. Place a shop towel under fuel line quick-connector at fuel rail. Use care when disconnecting fuel lines, as some fuel pressure may still exist in fuel lines. Disconnect fuel line quick-connector. Reinstall fuel pump relay in PDC. NOTE: One or more DTCs may set when fuel pump relay is removed.
4. Erase DTCs after fuel pressure release procedure. See CLEARING DTCS under SELF-DIAGNOSTIC SYSTEM.

CONNECTOR IDENTIFICATION

Note. The following terminals are shown as viewed from harness side of connector. Only connectors with 3 or more terminals (pins) are included. For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

CONNECTOR IDENTIFICATION

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

SELF-DIAGNOSTIC TESTS

Note. Unless otherwise indicated, self-diagnostic tests apply to gasoline engines only. Not all DTCs listed in DTC MESSAGES & CODES table are used on all models.

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box-III (DRB-III) scan tool. If using a generic scan tool, ensure scan tool is OBD-II certified. A generic scan tool may not be capable of performing all necessary test functions.

Note. Powertrain Control Module (PCM) connectors "A", "B" and "C" may also be referred to as connectors C1, C2 and C3 respectively.

Note. Sensor ground circuits may be identified as sensor return circuits.

DTC P0107: MAP SENSOR VOLTAGE TOO LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0107: MAP SENSOR VOLTAGE TOO LOW is monitored when engine speed is more than 416 RPM but less than 3520 RPM, Throttle Position (TP) sensor voltage is less than 1.13 volt and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Manifold Absolute Pressure (MAP) sensor voltage is less than .1 volt for 2 seconds with engine running. Possible causes are: defective MAP sensor, defective PCM, defective connectors or defective wiring.

Scheme 26

1. Start engine and allow it to idle. Using scan tool, read MAP sensor voltage. If voltage is less than.2 volt, turn ignition off and go to step 3). If voltage is.2 volt or more, turn ignition off and go to next step.
2. Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than 2.35 volts, go to next step. If voltage is 2.35 volts or more, go to step 8).
3. Turn ignition on, with engine off. Disconnect MAP sensor connector. (Scheme 26) Clean and/or repair connector as necessary. Using a voltmeter, check voltage on MAP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, repair open in 5-volt supply circuit. Perform TEST VER-5A.
4. Ensure MAP sensor connector is still disconnected. Ensure ignition is on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is more than 4.5 volts, replace MAP sensor. Perform TEST VER-5A. If voltage is 4.5 volts or less, go to next step.
5. Turn ignition off. Ensure MAP sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and MAP sensor connector, signal circuit (Dark Green/Red wire). If resistance is less than 5 ohms, repair short to ground in signal circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. Ensure ignition is off. Ensure MAP sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between MAP sensor connector, signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
7. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
8. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Turn ignition on, with engine off. Wiggle connectors and wiring harness from MAP sensor to PCM while monitoring MAP sensor voltage. (Scheme 26) PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If voltage changes while wiggling connectors and wiring harness, repair connectors and wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
10. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0107: MAP SENSOR VOLTAGE TOO LOW returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0107: MAP SENSOR VOLTAGE TOO LOW does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0108: MAP SENSOR VOLTAGE TOO HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0108: MAP SENSOR VOLTAGE TOO HIGH is monitored when engine speed is more than 416 RPM but less than 3520 RPM, Throttle Position (TP) sensor voltage is less than 1.13 volt and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Manifold Absolute Pressure (MAP) sensor voltage is more than 4.88 volts for 2.2 seconds with engine running. Possible causes are: defective MAP sensor, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle. Using scan tool, read MAP sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step 7).
2. Turn ignition off. Disconnect MAP sensor connector. (Scheme 26) Clean and/or repair connectors as necessary. Connect a jumper wire between ground and MAP sensor connector, sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than one volt, repair open in MAP sensor ground circuit. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
3. Turn ignition off. Ensure MAP sensor connector is still disconnected. (Scheme 26) Clean and/or repair connectors as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on MAP sensor connector, signal circuit (Dark Green/Red wire). If voltage is more than 5.5 volts, repair signal circuit shorted to voltage. Perform TEST VER-5A. If voltage is 5.5 volts or less, go to next step.
4. Turn ignition off. Ensure MAP sensor connector is still disconnected. (Scheme 26) Clean and/or repair connectors as necessary. Connect a jumper wire between MAP sensor connector, signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than one volt, replace MAP sensor. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
5. Turn engine off. Ensure MAP sensor connector is still disconnected. (Scheme 26) Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of MAP sensor connector, signal circuit (Dark Green/Red wire) between MAP sensor and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-5A.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle MAP sensor connector and wiring harness while monitoring MAP sensor voltage. If voltage goes to more than 4.6 volts while wiggling connectors and wiring harness, repair connectors and wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage stays at 4.6 volts or less, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0108: MAP SENSOR VOLTAGE TOO HIGH returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0108: MAP SENSOR VOLTAGE TOO HIGH does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0112: IAT SENSOR VOLTAGE LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0112: IAT SENSOR VOLTAGE LOW is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Intake Air Temperature (IAT) sensor voltage is less than .08 volt. Possible causes are: defective IAT sensor, defective PCM, defective connectors or defective wiring.

Scheme 27

1. Turn ignition on, with engine off. Using scan tool, read IAT sensor voltage. If voltage is less than.5 volt, go to next step. If voltage is.5 volt or more, go to step 6).
2. Turn ignition off. Disconnect IAT sensor connector. (Scheme 27) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read IAT sensor voltage. If voltage is more than 4 volts, replace IAT sensor. Perform TEST VER-5A. If voltage is 4 volts or less, go to next step.
3. Turn ignition off. Ensure IAT sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and IAT sensor connector, signal circuit (Black/Red wire). If resistance is less than 5 ohms, repair signal circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
4. Ensure ignition is off. Ensure IAT sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAT sensor connector, signal circuit (Black/Red wire) and sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
6. Turn ignition on, with engine off. Wiggle IAT sensor connector and wiring harness while monitoring IAT sensor voltage. If voltage changes while wiggling connector and wiring harness, repair connector or wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
7. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
8. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0112: IAT SENSOR VOLTAGE LOW returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0112: IAT SENSOR VOLTAGE LOW does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0113: INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0113: INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Intake Air Temperature (IAT) sensor voltage is more than 4.9 volts. Possible causes are: defective IAT sensor, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read IAT sensor voltage. If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, go to step 7).
2. Turn ignition off. Disconnect IAT sensor connector. (Scheme 27) Clean and/or repair connector as necessary. Connect a jumper wire between IAT sensor connector, signal circuit (Black/Red wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read IAT sensor voltage. If voltage is less than one volt, replace IAT sensor. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
3. Turn ignition off. Ensure IAT sensor connector is still disconnected. Connect a jumper wire between ground and IAT sensor connector, sensor ground circuit (Black/Light Blue wire). Using scan tool, read IAT sensor voltage. If voltage is less than one volt, repair open in sensor ground circuit. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
4. Turn ignition off. Ensure IAT sensor connector is still disconnected. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on IAT sensor connector, signal circuit (Black/Red wire). If voltage is more than 6 volts, repair signal circuit for short to voltage. Perform TEST VER-5A. If voltage is 6 volts or less, go to next step.
5. Ensure ignition is off. Ensure IAT sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of IAT sensor signal circuit (Black/Red wire) between IAT sensor and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-5A.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Turn ignition on, with engine off. Wiggle IAT sensor connector and wiring harness while monitoring IAT sensor voltage. If voltage changes while wiggling connector and wiring harness, repair connector or wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0113: INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0113: INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0117: ECT SENSOR VOLTAGE TOO LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0117: ECT SENSOR VOLTAGE TOO LOW is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Engine Coolant Temperature (ECT) sensor voltage is less than .8 volt for more than 3 seconds. Possible causes are: defective ECT sensor, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is less than.5 volt, go to next step. If voltage is.5 volt or more, go to step 6).
2. Turn ignition off. Disconnect ECT sensor connector. (Scheme 27) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor. Perform TEST VER-5A. If voltage is 4 volts or less, go to next step.
3. Turn ignition off. Ensure ECT sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and ECT sensor connector, signal circuit (Tan/Black wire). If resistance is less than 5 ohms, repair short to ground in signal circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
4. Ensure ignition is off. Ensure ECT and PCM connectors are still disconnected. Using ohmmeter, check resistance between ECT sensor connector, signal circuit (Tan/Black wire) and sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
6. Turn ignition on, with engine off. Wiggle ECT sensor connector and wiring harness while monitoring ECT sensor voltage. If voltage changes while wiggling connector and wiring harness, repair connector or wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
7. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
8. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0117: ECT SENSOR VOLTAGE TOO LOW returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0117: ECT SENSOR VOLTAGE TOO LOW does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0118: ECT SENSOR VOLTAGE TOO HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. P0118: ECT SENSOR VOLTAGE TOO HIGH is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Engine Coolant Temperature (ECT) sensor voltage is more than 4.98 volts for more than 3 seconds. Possible causes are: defective ECT sensor, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, go to step 7).
2. Turn ignition off. Ensure ECT sensor connector is still disconnected. Clean and/or repair connector as necessary. Connect a jumper wire between ground and ECT sensor connector, signal circuit (Tan/Black wire). Turn ignition on, with engine off. Using scan tool, read ECT voltage. If voltage is less than one volt, repair open signal circuit. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
3. Turn ignition off. Disconnect ECT sensor connector. (Scheme 27) Clean and/or repair connector as necessary. Connect a jumper wire between ECT sensor connector, signal circuit (Tan/Black wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read ECT sensor voltage. If voltage is less than one volt, replace ECT sensor. Perform TEST VER-5A. If voltage is one volt or more, go to next step.
4. Turn ignition off. Disconnect ECT sensor connector. (Scheme 27) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on ECT sensor connector, signal circuit (Tan/Black wire). If voltage is more than 6 volts, repair signal circuit for short to voltage. Perform TEST VER-5A. If voltage is 6 volts or less, go to next step.
5. Ensure ignition is off. Ensure ECT connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using ohmmeter, check resistance of ECT sensor signal circuit (Tan/Black wire) between ECT sensor and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-5A.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Turn ignition on, with engine off. Wiggle ECT sensor connector and wiring harness while monitoring ECT sensor voltage. If voltage changes while wiggling connector and wiring harness, repair connector or wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0118: ECT SENSOR VOLTAGE TOO HIGH returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0118: ECT SENSOR VOLTAGE TOO HIGH does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0121: TPS VOLTAGE DOES NOT AGREE WITH MAP

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0121: TPS VOLTAGE DOES NOT AGREE WITH MAP is monitored with engine running and no Manifold Absolute Pressure (MAP) or Throttle Position (TP) sensor DTCs present. Engine speed must be more than 1600 RPM for all TP sensor testing. Possible causes are: MAP sensor DTC present, defective connectors, defective wiring, erratic TP sensor voltage change, TP sensor voltage more than one volt or more than 3.5 volts.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If any MAP sensor DTCs are present, perform appropriate test for specified DTC(s). See DTC P0107: MAP SENSOR VOLTAGE TOO LOW or DTC P0108: MAP SENSOR VOLTAGE TOO HIGH. If no MAP sensor DTCs are present, go to next step.
2. Ensure ignition is on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than 3.5 volts, perform NTC-8A: CHECKING MAP SENSOR CALIBRATION TEST. If voltage is 3.5 volts or more, go to next step.
3. Start engine and allow it to idle. Using scan tool, read MAP sensor voltage. If voltage decreases from more than 3.5 volts to less than 2 volts, go to next step. If voltage does not decrease from more than 3.5 volts to less than 2 volts, perform NTC-8A: CHECKING MAP SENSOR CALIBRATION TEST.
4. Turn engine off. Turn ignition on, with engine off. Wiggle TP sensor connector and wiring harness while monitoring TP sensor voltage. (Scheme 26) If voltage changes while wiggling connector and wiring harness, repair connector or wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
5. Ensure ignition is on, with engine off. Open throttle plate to wide-open throttle while monitoring TP sensor voltage. If voltage is more than 3.5 volts, go to next step. If voltage is 3.5 volts or less, replace TP sensor. Perform TEST VER-5A.
6. Turn ignition off. Disconnect TP sensor connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on TP sensor connector, 5-volt supply circuit (Orange wire). If voltage is less than 5 volts, repair open 5-volt supply circuit. Perform TEST VER-5A. If voltage is 5 volts or more, go to next step.
7. Turn ignition on, with engine off. Using scan tool, read TP sensor voltage. If voltage is more than one volt, replace TP sensor. Perform TEST VER-5A. If voltage is one volt or less, go to next step. NOTE: If TP sensor connector, 5-volt supply circuit (Orange wire) and sensor ground circuit (Black/Light Blue wire) are switched at TP sensor connector, DTC P0121: TPS VOLTAGE DOES NOT AGREE WITH MAP DTC will set.
8. Turn ignition off. Check throttle plate and linkage for binding. Repair throttle plate and linkage as necessary. Disconnect TP sensor connector. Clean and/or repair connector as necessary. Inspect connector for proper wire installation in appropriate connector terminal. See «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification). Correct wire installation as necessary. Perform TEST VER-5A. If wires are properly installed, go to next step. NOTE: Throttle linkage must be moved very slowly while looking for a smooth change in voltage in this step.
9. Ensure ignition is on, with engine off. Slowly open and close throttle plate while monitoring TP sensor voltage. If voltage change is smooth, go to next step. If voltage change is erratic, replace TP sensor. Perform TEST VER-5A.
10. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0121: TPS VOLTAGE DOES NOT AGREE WITH MAP returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0121: TPS VOLTAGE DOES NOT AGREE WITH MAP does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0122: THROTTLE POSITION SENSOR VOLTAGE LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0122: THROTTLE POSITION SENSOR VOLTAGE LOW is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Throttle Position (TP) sensor voltage is .1 volt for 3.2 seconds. Possible causes are: defective TP sensor, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read TP sensor voltage. If voltage is less than.2 volt, go to next step. If voltage is.2 volt or more, go to step 7).
2. Ensure ignition is off. Disconnect TP sensor connector. (Scheme 26) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on TP sensor connector, 5-volt supply circuit (Orange wire). If voltage is less than 4 volts, repair open 5-volt supply circuit. Perform TEST VER-5A. If voltage is 4 volts or more, go to next step.
3. Turn ignition off. Ensure TP sensor connector is still disconnected. Turn ignition on with engine off. Using scan tool, read TP sensor voltage. If voltage is more than one volt, replace TP sensor. Perform TEST VER-5A. If voltage is one volt or less, go to next step.
4. Turn ignition off. Ensure TP sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and TP sensor connector, signal circuit (Orange/Dark Blue wire). If resistance is less than 5 ohms, repair signal circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
5. Ensure ignition is off. Ensure TP sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between TP sensor connector, sensor ground circuit (Black/Light Blue wire) and signal circuit (Orange/Dark Blue wire). If resistance is less than 5 ohms, repair sensor ground circuit for short to signal circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A. NOTE: Throttle linkage must be moved very slowly while looking for a smooth change in voltage in this step.
7. Ensure ignition is on, with engine off. Slowly open and close throttle plate while monitoring TP sensor voltage. If voltage change is smooth, go to next step. If voltage change is erratic, replace TP sensor. Perform TEST VER-5A.
8. Start engine and allow it to idle. Wiggle TP sensor connector and wiring harness while monitoring engine RPM. If an RPM change occurs while wiggling connector and wiring harness, repair connector or wiring harness that caused RPM to change. Perform TEST VER-5A. If no RPM change occurs, go to next step.
9. Turn engine off. Turn ignition on, with engine off. Wiggle TP sensor connector and wiring harness while monitoring TP sensor voltage. If voltage changes while wiggling connectors and wiring harness, repair connectors and wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
10. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
11. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0122: THROTTLE POSITION SENSOR VOLTAGE LOW returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0122: THROTTLE POSITION SENSOR VOLTAGE LOW does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0123: THROTTLE POSITION SENSOR VOLTAGE HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0123: THROTTLE POSITION SENSOR VOLTAGE HIGH is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses Throttle Position (TP) sensor voltage is 4.9 volts for 3.2 seconds. Possible causes are: defective TP sensor, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read TP sensor voltage. If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, go to step 7).
2. Turn ignition off. Disconnect TP sensor connector. (Scheme 26) Clean and/or repair connector as necessary. Connect a jumper wire between TP sensor connector, signal circuit (Orange/Dark Blue wire) and sensor ground circuit (Black/Light Blue wire). Using scan tool, read TP sensor voltage. If voltage is less than one volt, replace TP sensor. Perform TEST VER-5A. If voltage is more than one volt, go to next step.
3. Turn ignition off. Ensure TP sensor connector is still disconnected. Clean and/or repair connector as necessary. Connect a jumper wire between ground and TP sensor connector, signal circuit (Orange/Dark Blue wire). Using scan tool, read TP sensor voltage. If voltage is less than one volt, repair open in signal circuit. Perform TEST VER-5A. If voltage is more than one volt, go to next step.
4. Turn ignition off. Ensure TP sensor connector is still disconnected. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on TP sensor connector, signal circuit (Orange/Dark Blue wire). If voltage is more than 5.5 volts, repair signal circuit for short to voltage. Perform TEST VER-5A. If voltage is 5.5 volts or less, go to next step.
5. Turn ignition off. Ensure TP sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of sensor signal circuit (Orange/Dark Blue wire) between TP sensor and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-5A.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle TP sensor connector and wiring harness while monitoring engine RPM. If an RPM change occurs while wiggling connector and wiring harness, repair connector or wiring harness that caused RPM to change. Perform TEST VER-5A. If no RPM change occurs, go to next step. NOTE: Throttle linkage must be moved very slowly while looking for a smooth change in voltage in this step.
8. Ensure ignition is on, with engine off. Slowly open and close throttle plate while monitoring TP sensor voltage. If voltage change is smooth, go to next step. If voltage change is erratic, replace TP sensor. Perform TEST VER-5A.
9. Turn ignition on, with engine off. Wiggle TP sensor connector and wiring harness while monitoring TP sensor voltage. If voltage changes while wiggling connectors and wiring harness, repair connectors and wiring harness that caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
10. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
11. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC P0123: THROTTLE POSITION SENSOR VOLTAGE HIGH returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0123: THROTTLE POSITION SENSOR VOLTAGE HIGH does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Test is complete.

DTC P0125: CLOSED LOOP TEMP NOT REACHED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0125: CLOSED LOOP TEMP NOT REACHED is monitored for 10 minutes after engine is started. DTC may be stored in Powertrain Control Module (PCM) when PCM senses that Engine Coolant Temperature (ECT) sensor does not go to more than 18°F (-7.8°C) within 10 minutes after engine is started. Two trips are required to set this DTC. Possible causes are: defective ECT sensor, defective thermostat, defective PCM, defective connectors or defective wiring.

Note. The following test is invalid if thermostat is stuck open.

1. Start engine and allow it to idle until engine temperature is more than 180°F (82.2°C). Check thermostat operation. Replace thermostat if necessary. Perform TEST VER-5A. If thermostat is operating correctly, go to next step. NOTE: Engine temperature must be more than 80°F (26.6°C) in this step.
2. Turn ignition off. Disconnect ECT sensor connector. (Scheme 27) Clean and/or repair connector as necessary. Using an ohmmeter, check resistance across ECT sensor terminals. If resistance is less than 11,000 ohms, go to next step. If resistance is 11,000 ohms or more, replace ECT sensor. Perform TEST VER-5A.
3. Ensure ignition is off. Ensure ECT sensor connector is still disconnected. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
4. Ensure ignition is off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. Perform TEST VER-5A. If connectors are okay, go to next step.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.

DTC P0131: 1/1 O2S VOLTAGE SHORTED TO GROUND

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0131: 1/1 O2S VOLTAGE SHORTED TO GROUND is monitored after ignition is turned off and 1/1 Heated Oxygen Sensor (HO2S) cools down, and after the next time ignition is turned on, provided engine coolant temperature is less than 98°F (36.6°C) and ambient/battery temperature is within 27°F (2.8°C), plus or minus, of engine coolant temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/1 HO2S voltage is less than .156 volt for 28 seconds after engine is subsequently started. Possible causes are: defective 1/1 HO2S, defective PCM, defective connectors or defective wiring.

Note. 1/1 HO2S is located in upstream position.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 4).
2. Turn ignition off. Disconnect 1/1 HO2S connector. Clean and/or repair connector as necessary. Check for short circuit between ground and 1/1 HO2S signal circuit (Tan/White wire). If short circuit exists, go to next step. If short circuit does not exist, replace 1/1 HO2S. Perform TEST VER-5A.
3. Ensure ignition is off. Ensure 1/1 HO2S connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Check for short circuit between engine block (ground) and 1/1 HO2S signal circuit (Tan/White wire). If short circuit to ground exists, repair signal circuit for short to ground as necessary. Perform TEST VER-5A. If short circuit to ground does not exist, repair signal circuit for short to sensor ground circuit (Black/Light Blue wire). Perform TEST VER-5A.
4. Ensure ignition is off. Ensure 1/1 HO2S connector is still disconnected. Clean and/or repair connector as necessary. Wiggle 1/1 HO2S connector and wiring harness between 1/1 HO2S and PCM, while determining if short circuit exists between ground and 1/1 HO2S connector, signal circuit (Tan/White wire). If a short to ground exists, go to next step. If short to ground does not exist, go to step 6).
5. Ensure ignition is off. Ensure 1/1 HO2S and PCM connectors are still disconnected. Clean and/or repair connectors as necessary. Wiggle 1/1 HO2S connector and wiring harness while determining if short circuit exists between ground and 1/1 HO2S signal circuit (Tan/White wire). Repair short to ground in signal circuit as necessary. Perform TEST VER-5A. If short to ground does not exist, repair signal circuit for short to sensor ground circuit (Black/Light Blue wire). Perform TEST VER-5A.
6. Ensure 1/1 HO2S connector is still disconnected. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, go to next step. If DTC does not match, repair DTC using FREEZE FRAME data.
7. Road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", repeat test. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", test is complete.

DTC P0132: 1/1 O2 SEN SHORTED TO VOLTAGE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0132: 1/1 O2 SEN SHORTED TO VOLTAGE is monitored with engine running for more than 4 minutes and engine coolant temperature reaches 180°F (82.2°C). DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/1 Heated Oxygen Sensor (HO2S) voltage is more than 1.5 volts. Possible causes are: defective 1/1 HO2S, defective PCM, defective connectors or defective wiring.

Note. 1/1 HO2S is located in upstream position.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 4).
2. Turn ignition off. Disconnect 1/1 HO2S connector. Clean and/or repair connector as necessary. Start engine and allow it to idle. Using a voltmeter, check voltage between engine block (ground) and 1/1 HO2S connector, signal circuit (Tan/White wire). If voltage is more than 5.1 volts, go to next step. If voltage is 5.1 volts or less, go to step 6).
3. Ensure 1/1 HO2S connector is still disconnected. Using a voltmeter, check voltage between engine block (ground) and 1/1 HO2S connector, signal circuit (Tan/White wire). Turn ignition off, then on. If voltage is more than 5.1 volts, repair signal circuit for short to voltage with engine off, key on. Perform TEST VER-5A. If voltage is 5.1 volts or less, repair signal circuit for short to voltage with engine running. Perform TEST VER-5A.
4. Ensure ignition is off. Disconnect 1/1 HO2S connector. Clean and/or repair connector as necessary. Using a voltmeter, check voltage between engine block (ground) and 1/1 HO2S connector, signal circuit (Tan/White wire) while wiggling 1/1 HO2S connector and wiring harness between 1/1 HO2S and PCM connector. Start engine and allow it to idle. If voltage is more than 5.1 volts, go to next step. If voltage is 5.1 volts or less, go to step 6).
5. Ensure 1/1 HO2S connector is still disconnected. Using voltmeter, check voltage between engine block (ground) and 1/1 HO2S connector, signal circuit (Tan/White wire) while wiggling 1/1 HO2S connector and wiring harness between 1/1 HO2S and PCM. Turn ignition off, then on. If voltage is more than 5.1 volts, repair signal circuit for short to voltage with engine off, key on. Perform TEST VER-5A. If voltage is 5.1 volts or less, repair signal circuit for short to voltage with engine running. Perform TEST VER-5A.
6. Turn ignition off. Disconnect 1/1 HO2S connector. Clean and/or repair connector as necessary. Start engine and allow it to idle. Using a voltmeter, check voltage between ground and 1/1 HO2S connector, signal circuit (Tan/White wire). If voltage is more than 4 volts, perform DTC P0135: 1/1 O2 SENSOR HEATER FAILURE test. If voltage is 4 volts or less, go to next step.
7. Turn engine off. Ensure 1/1 HO2S connector is still disconnected. Check for open in signal circuit (Tan/White wire) between 1/1 HO2S connector and PCM connector. If open circuit exists, repair as necessary. Perform TEST VER-5A. If open circuit does not exist, go to next step.
8. Turn ignition off. Ensure 1/1 HO2S connector is still disconnected. Turn ignition on. Using voltmeter connected to engine block (ground), backprobe PCM connector, signal circuit (Tan/White wire). If voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, replace PCM. Perform TEST VER-5A.
9. Ensure 1/1 HO2S connector is still disconnected. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, go to next step. If DTC does not match, repair DTC using FREEZE FRAME data.
10. Road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", perform DTC P0135: 1/1 O2 SENSOR HEATER FAILURE test. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", test is complete.

DTC P0133: 1/1 O2S SLOW RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0133: 1/1 O2S SLOW RESPONSE is monitored with engine coolant temperature more than 147°F (63.9°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive (A/T) or Neutral (M/T). DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/1 Heated Oxygen Sensor (HO2S) voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes are: engine mechanical problem, exhaust leak, defective 1/1 HO2S, defective connectors or defective wiring.

Note. 1/1 HO2S is located in upstream position.

1. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 5). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Turn ignition on, with engine off. Using a voltmeter, backprobe sensor ground circuit (Black/Light Blue wire) between PCM and 1/1 HO2S. Wiggle sensor ground circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling sensor ground circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling sensor ground circuit, repair poor connection (high resistance) in sensor ground circuit. Perform TEST VER-5A3.
3. Ensure ignition is on, with engine off. Using voltmeter, backprobe 1/1 HO2S signal circuit (Tan/White wire) between PCM and 1/1 HO2S. Wiggle signal circuit while monitoring voltage. If voltage drops to less than .1 VDC while wiggling signal circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling signal circuit, repair poor connection (high resistance) in 1/1 HO2S signal circuit. Perform TEST VER-5A3.
4. At this time, DTC P0133: 1/1 O2S SLOW RESPONSE does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0133: 1/1 O2S SLOW RESPONSE returns, go to next step. If DTC P0133: 1/1 O2S SLOW RESPONSE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
5. Start engine and allow it to idle. Check exhaust system for excessive smoke caused by coolant or oil consumption. Repair engine mechanical problem as necessary and replace 1/1 HO2S. Perform TEST VER-5A3. If engine mechanical condition is okay, go to next step.
6. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. Perform TEST VER-5A3. If exhaust system is okay, go to next step.
7. Turn engine off. Turn ignition on, with engine off. Using a voltmeter, backprobe 1/1 HO2S signal circuit (Tan/White wire) between PCM and 1/1 HO2S. Wiggle signal circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling signal circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling signal circuit, repair poor connection (high resistance) in signal circuit. Perform TEST VER-5A3.
8. Ensure ignition is on, with engine off. Using voltmeter, backprobe sensor ground circuit (Black/Light Blue wire) between PCM and 1/1 HO2S. Wiggle sensor ground circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling sensor ground circuit, replace 1/1 HO2S. Perform TEST VER-5A3. If voltage does not drop to less than .1 VDC while wiggling sensor ground circuit, repair poor connection (high resistance) in sensor ground circuit. Perform TEST VER-5A3.

DTC P0135: 1/1 O2 SENSOR HEATER FAILURE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0135: 1/1 O2 SENSOR HEATER FAILURE is monitored with engine at idle immediately after a cold start, with engine coolant temperature less than 147°F (63.9°C) and ambient/battery temperature within 27°F (2.8°C), plus or minus, of engine coolant temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/1 Heated Oxygen Sensor (HO2S) voltage is more than 3 volts for 30-90 seconds. Possible causes are: engine mechanical problem, exhaust leak, defective 1/1 HO2S, defective connectors or defective wiring.

Note. 1/1 HO2S is located in upstream position.

1. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. Turn ignition on, with engine off. Using scan tool in SENSOR mode, wait for 1/1 HO2S voltage to reach 4.5 volts (about 3 minutes). Using scan tool in ACTUATOR mode, perform and monitor 1/1 HO2S HEATER TEST voltage for 3 minutes. If voltage is more than one volt, go to step 4). If voltage is one volt or less, go to next step.
3. At this time, DTC P0135: 1/1 O2S HEATER FAILURE does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0135: 1/1 O2S HEATER FAILURE returns, go to next step. If DTC P0135: 1/1 O2S HEATER FAILURE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Turn ignition off. Disconnect 1/1 HO2S connector. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A3. If connector is okay, go to next step.
5. Turn ignition on, with engine off. Using scan tool in ACTUATOR mode, perform 1/1 HO2S HEATER TEST. Using a voltmeter, check voltage on 1/1 HO2S connector, ASD relay output circuit (Dark Green wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-5A3.
6. Ensure 1/1 HO2S connector is still disconnected. Using an ohmmeter, check resistance across 1/1 HO2S connector (component side), heater element circuits (White wires). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace 1/1 HO2S. Perform TEST VER-5A3.
7. Ensure 1/1 HO2S connector is still disconnected. Using ohmmeter, check resistance between ground and 1/1 HO2S connector, heater ground circuit (Black wire). If resistance is less than 5 ohms, replace 1/1 HO2S. Perform TEST VER-5A3. If resistance is 5 ohms or more, repair open heater ground circuit. Perform TEST VER-5A3.

DTC P0137: 1/2 O2S VOLTS SHORTED TO GROUND

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0137: 1/2 O2S VOLTS SHORTED TO GROUND is monitored with engine coolant temperature at more than 170°F (76.7°C) on previous ignition on, after a cold start, engine coolant temperature less than 98°F (36.7°C) and ambient/battery temperature is within 27°F (2.8°C), plus or minus, of engine coolant temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/2 Heated Oxygen Sensor (HO2S) voltage is less than .156 volt for 28 seconds after engine is subsequently started. Possible causes are: defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.

Note. 1/2 HO2S is located in downstream position.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 4).
2. Turn ignition off. Disconnect 1/2 HO2S connector. Clean and/or repair connector as necessary. Check for short circuit between ground and 1/1 HO2S signal circuit (Black/Dark Green wire). If short circuit exists, go to next step. If short circuit does not exist, replace 1/2 HO2S. Perform TEST VER-5A.
3. Ensure ignition is off. Ensure 1/2 HO2S connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Check for short circuit between engine block (ground) and 1/2 HO2S signal circuit (Black/Dark Green wire). If short circuit exists, repair signal circuit for short to ground. Perform TEST VER-5A. If short to ground does not exist, repair signal circuit for short to sensor ground circuit (Black/Light Blue wire). Perform TEST VER-5A.
4. Ensure ignition is off. Ensure 1/2 HO2S connector is still disconnected. Wiggle 1/2 HO2S connector and wiring harness between 1/2 HO2S and PCM, while determining if short circuit exists between engine block (ground) and 1/2 HO2S connector, signal circuit (Black/Dark Green wire). If a short circuit exists, go to next step. If short circuit does not exist, go to step 6).
5. Ensure ignition is off. Ensure 1/2 HO2S and PCM connectors are still disconnected. Clean and/or repair connectors as necessary. Wiggle 1/2 HO2S connector and wiring harness while determining if short circuit exists between engine block (ground) and 1/2 HO2S signal circuit (Black/Dark Green wire). If a short circuit exists, repair short to ground in signal circuit. Perform TEST VER-5A. If short circuit does not exist, repair signal circuit for short to sensor ground circuit (Black/Light Blue wire). Perform TEST VER-5A.
6. Ensure 1/2 HO2S connector is still disconnected. Clean and/or repair connector as necessary. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, go to next step. If DTC does not match, repair DTC using FREEZE FRAME data.
7. Road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", repeat test. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", test is complete.

DTC P0138: 1/2 O2S SHORTED TO VOLTAGE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0138: 1/2 O2S SHORTED TO VOLTAGE is monitored with engine running for more than 4 minutes and engine coolant temperature at more than 180°F (82.2°C). DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/2 Heated Oxygen Sensor (HO2S) voltage is more than 1.5 volts. Possible causes are: defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.

Note. 1/2 HO2S is located in downstream position.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 4).
2. Turn ignition off. Disconnect 1/2 HO2S connector. Clean and/or repair connector as necessary. Start engine and allow it to idle. Using a voltmeter, check voltage between engine block (ground) and 1/2 HO2S connector, signal circuit (Black/Dark Green wire). If voltage is more than 5.1 volts, go to next step. If voltage is 5.1 volts or less, go to step 6).
3. Ensure 1/2 HO2S connector is still disconnected. Using a voltmeter, check voltage between engine block (ground) and 1/2 HO2S connector, signal circuit (Black/Dark Green wire). Turn ignition off, then on. If voltage is more than 5.1 volts, repair signal circuit for short to voltage with engine off, key on. Perform TEST VER-5A. If voltage is 5.1 volts or less, repair signal circuit for short to voltage with engine running. Perform TEST VER-5A.
4. Ensure ignition is off. Disconnect 1/2 HO2S connector. Clean and/or repair connector as necessary. Using a voltmeter, check voltage between engine block (ground) and 1/2 HO2S connector, signal circuit (Black/Dark Green wire) while wiggling 1/2 HO2S connector and wiring harness between 1/2 HO2S and PCM connector. Start engine and allow it to idle. If voltage is more than 5.1 volts, go to next step. If voltage is 5.1 volts or less, go to step 6).
5. Ensure 1/2 HO2S connector is still disconnected. Using a voltmeter, check voltage between engine block (ground) and 1/2 HO2S connector, signal circuit (Black/Dark Green wire) while wiggling 1/2 HO2S connector and wiring harness between 1/2 HO2S and PCM. Turn ignition off, then on. If voltage is more than 5.1 volts, repair signal circuit for short to voltage with engine off, key on. Perform TEST VER-5A. If voltage is 5.1 volts or less, repair signal circuit for short to voltage with engine running. Perform TEST VER-5A.
6. Turn ignition off. Disconnect 1/2 HO2S connector. Clean and/or repair connector as necessary. Start engine and allow it to idle. Using a voltmeter, check voltage between ground and 1/2 HO2S connector, signal circuit (Black/Dark Green wire). If voltage is more than 4 volts, perform DTC P0141: 1/2 O2 SENSOR HEATER FAILURE test. If voltage is 4 volts or less, go to next step.
7. Turn engine off. Ensure 1/2 HO2S connector is still disconnected. Check for open in signal circuit (Black/Dark Green wire) between 1/2 HO2S connector and PCM connector. If open circuit exists, repair as necessary. Perform TEST VER-5A. If open circuit does not exist, go to next step.
8. Turn ignition off. Ensure 1/2 HO2S connector is still disconnected. Turn ignition on. Using voltmeter connected to engine block (ground), backprobe PCM connector, signal circuit (Black/Dark Green wire). If voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, replace PCM. Perform TEST VER-5A.
9. Ensure 1/2 HO2S connector is still disconnected. Using scan tool, read and record FREEZE FRAME data. Ensure CAUSED BY DTC matches DTC on DTC screen. If DTC matches, go to next step. If DTC does not match, repair DTC using FREEZE FRAME data.
10. Road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", perform DTC P0141: 1/2 O2 SENSOR HEATER FAILURE test. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", test is complete.

DTC P0139: 1/2 O2 SENSOR SLOW RESPONSE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0139: 1/2 O2 SENSOR SLOW RESPONSE is monitored with engine coolant temperature more than 147°F (63.9°C), after reaching a vehicle speed of 10 MPH, and throttle remains open (off idle) for 2 minutes and subsequently bringing vehicle to a stop and allowing engine to idle in Drive (A/T) or Neutral (M/T). DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/2 Heated Oxygen Sensor (HO2S) voltage is switching from less than .27 volt to more than .62 volt and back less times than required. Possible causes are: engine mechanical problem, exhaust leak, defective 1/2 HO2S, defective PCM, defective connectors or defective wiring.

Note. 1/2 HO2S is located in downstream position.

1. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 5). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Turn ignition on, with engine off. Using a voltmeter, backprobe sensor ground circuit (Black/Light Blue wire) between PCM and 1/2 HO2S. Wiggle sensor ground circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling sensor ground circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling sensor ground circuit, repair poor connection (high resistance) in sensor ground circuit. Perform TEST VER-5A3.
3. Ensure ignition is on, with engine off. Using voltmeter, backprobe 1/2 HO2S signal circuit (Black/Dark Green wire) between PCM and 1/2 HO2S. Wiggle signal circuit while monitoring voltage. If voltage drops to less than .1 VDC while wiggling signal circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling signal circuit, repair poor connection (high resistance) in 1/1 HO2S signal circuit. Perform TEST VER-5A3.
4. At this time, DTC P0139: 1/2 O2S SLOW RESPONSE does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0139: 1/2 O2S SLOW RESPONSE returns, go to next step. If DTC P0139: 1/2 O2S SLOW RESPONSE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
5. Start engine and allow it to idle. Check exhaust system for excessive smoke caused by coolant or oil consumption. Repair engine mechanical problem as necessary and replace 1/2 HO2S. Perform TEST VER-5A3. If engine mechanical condition is okay, go to next step.
6. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. Perform TEST VER-5A3. If exhaust system is okay, go to next step.
7. Turn engine off. Turn ignition on, with engine off. Using a voltmeter, backprobe 1/2 HO2S signal circuit (Black/Dark Green wire) between PCM and 1/2 HO2S. Wiggle signal circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling signal circuit, go to next step. If voltage does not drop to less than .1 VDC while wiggling signal circuit, repair poor connection (high resistance) in signal circuit. Perform TEST VER-5A3.
8. Ensure ignition is on, with engine off. Using voltmeter, backprobe sensor ground circuit (Black/Light Blue wire) between PCM and 1/2 HO2S. Wiggle sensor ground circuit while monitoring voltage. If voltage drops to less than .1 Volt Direct Current (VDC) while wiggling sensor ground circuit, replace 1/2 HO2S. Perform TEST VER-5A3. If voltage does not drop to less than .1 VDC while wiggling sensor ground circuit, repair poor connection (high resistance) in sensor ground circuit. Perform TEST VER-5A3.

DTC P0141: 1/2 O2 SENSOR HEATER FAILURE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0141: 1/2 O2 SENSOR HEATER FAILURE is monitored with engine at idle immediately after a cold start, with engine coolant temperature less than 147°F (63.9°C) and ambient/battery temperature within 27°F (2.8°C), plus or minus, of engine coolant temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses that 1/2 Heated Oxygen Sensor (HO2S) voltage is more than 3 volts for 30-90 seconds. Possible causes are: engine mechanical problem, exhaust leak, defective 1/2 HO2S, defective connectors or defective wiring.

Note. 1/2 HO2S is located in downstream position.

1. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. Turn ignition on, with engine off. Using scan tool in SENSOR mode, wait for 1/2 HO2S voltage to reach 4.5 volts (about 3 minutes). Using scan tool in ACTUATOR mode, perform and monitor 1/2 HO2S HEATER TEST voltage for 3 minutes. If voltage is more than one volt, go to step 4). If voltage is one volt or less, go to next step.
3. At this time, DTC P0141: 1/2 O2 SENSOR HEATER FAILURE does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0141: 1/2 O2 SENSOR HEATER FAILURE returns, go to next step. If DTC P0141: 1/2 O2 SENSOR HEATER FAILURE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Turn ignition off. Disconnect 1/2 HO2S connector. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A3. If connector is okay, go to next step.
5. Turn ignition on, with engine off. Using scan tool in ACTUATOR mode, perform 1/2 HO2S HEATER TEST. Using a voltmeter, check voltage on 1/2 HO2S connector, ASD relay output circuit (Dark Green wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-5A3.
6. Ensure 1/2 HO2S connector is still disconnected. Using an ohmmeter, check resistance across 1/2 HO2S connector (component side), heater element circuits (White wires). If resistance is 4-7 ohms, go to next step. If resistance is not 4-7 ohms, replace 1/2 HO2S. Perform TEST VER-5A3.
7. Ensure 1/2 HO2S connector is still disconnected. Using ohmmeter, check resistance between ground and 1/2 HO2S connector, heater sensor ground circuit (Black wire). If resistance is less than 5 ohms, replace 1/2 HO2S. Perform TEST VER-5A3. If resistance is 5 ohms or more, repair open heater sensor ground circuit. Perform TEST VER-5A3.

DTC P0171: 1/1 FUEL SYSTEM LEAN

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0171: 1/1 FUEL SYSTEM LEAN is monitored with engine running in closed loop mode, ambient/battery temperature at more than 20°F (-6.7°C), and at altitude less than 8000 feet. DTC may be stored in Powertrain Control Module (PCM) when PCM senses fuel system is running too lean on 2 sequential trips. Possible causes are: defective Engine Coolant Temperature (ECT) sensor calibration, engine mechanical problem, fuel pressure out of specification, defective 1/1 Heated Oxygen Sensor (HO2S) heater or fuel system not switching from rich to lean.

Note. 1/1 HO2S is located in upstream position.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If FUEL SYSTEM LEAN or FUEL SYSTEM RICH GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If FUEL SYSTEM LEAN or FUEL SYSTEM RICH GOOD TRIP COUNTER is not displayed and/or displayed count is not "0", go to next step.
2. At this time, DTC P0171: 1/1 FUEL SYSTEM LEAN does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0171: 1/1 FUEL SYSTEM LEAN returns, go to next step. If DTC P0171: 1/1 FUEL SYSTEM LEAN does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
3. Ensure ignition is on, with engine off. Using scan tool, read ECT sensor value. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.6°C) before proceeding. If engine coolant temperature is 150°F (65.6°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82.2°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value increase is erratic, check for cooling system problems and replace ECT sensor. Perform TEST VER-5A2.
4. Using scan tool, actuate 1/1 HO2S while monitoring 1/1 HO2S voltage for 2 minutes. If 1/1 HO2S voltage is more than .1 volt, replace 1/1 HO2S. Perform TEST VER-5A2. If 1/1 HO2S voltage is .1 volt or less, go to next step.
5. Perform fuel pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure test passes, go to next step. If fuel pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
6. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector

Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.

DTC P0172: 1/1 FUEL SYSTEM RICH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0172: 1/1 FUEL SYSTEM RICH is monitored with engine running in closed loop mode, ambient/battery temperature at more than 20°F (-6.7°C), and at altitude less than 8000 feet. DTC may be stored in Powertrain Control Module (PCM) when PCM senses fuel system is running too rich on 2 sequential trips. Possible causes are: defective Engine Coolant Temperature (ECT) sensor calibration, engine mechanical problem, fuel pressure out of specification, defective 1/1 Heated Oxygen Sensor (HO2S) heater or fuel system not switching from lean to rich.

Note. 1/1 HO2S is located in upstream position.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If FUEL SYSTEM LEAN or FUEL SYSTEM RICH GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If FUEL SYSTEM LEAN or FUEL SYSTEM RICH GOOD TRIP COUNTER is not displayed and/or displayed count is not "0", go to next step.
2. At this time, DTC P0172: 1/1 FUEL SYSTEM RICH does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0172: 1/1 FUEL SYSTEM RICH returns, go to next step. If DTC P0172: 1/1 FUEL SYSTEM RICH does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
3. Ensure ignition is on, with engine off. Using scan tool, read ECT sensor value. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.6°C) before proceeding. If engine coolant temperature is 150°F (65.6°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82.2°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value increase is erratic, check for cooling system problems and replace ECT sensor. Perform TEST VER-5A2.
4. Using scan tool, actuate 1/1 HO2S while monitoring 1/1 HO2S voltage for 2 minutes. If 1/1 HO2S voltage is more than .1 volt, replace 1/1 HO2S. Perform TEST VER-5A2. If 1/1 HO2S voltage is .1 volt or less, go to next step.
5. Perform fuel pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure test passes, go to next step. If fuel pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
6. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector

Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.

DTC P0201: INJECTOR #1 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0201: INJECTOR #1 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 1 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 1. Using a 12-volt test light connected to ground, probe injector No. 1 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 1 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 1 connector, driver circuit (White/Dark Blue wire). Using scan tool, actuate injector No. 1 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 1 is actuated, replace injector No. 1. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 1 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 1 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 1 driver circuit (White/Dark Blue wire) between injector No. 1 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 1 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 1 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 1 driver circuit (White/Dark Blue wire). If resistance is less than 5 ohms, repair injector No. 1 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 1 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0201: INJECTOR #1 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0201: INJECTOR #1 CONTROL CIRCUIT does not return, DTC P0201: INJECTOR #1 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0202: INJECTOR #2 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0202: INJECTOR #2 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 2 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 2. Using a 12-volt test light connected to ground, probe injector No. 2 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 2 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 2 connector, driver circuit (Tan wire). Using scan tool, actuate injector No. 2 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 2 is actuated, replace injector No. 2. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 2 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 2 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 2 driver circuit (Tan wire) between injector No. 2 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 2 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 2 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 2 driver circuit (Tan wire). If resistance is less than 5 ohms, repair injector No. 2 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 2 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0202: INJECTOR #2 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0202: INJECTOR #2 CONTROL CIRCUIT does not return, DTC P0202: INJECTOR #2 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0203: INJECTOR #3 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0203: INJECTOR #3 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 3 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 3. Using a 12-volt test light connected to ground, probe injector No. 3 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 3 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 3 connector, driver circuit (Yellow/White wire). Using scan tool, actuate injector No. 3 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 3 is actuated, replace injector No. 3. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 3 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 3 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 3 driver circuit (Yellow/White wire) between injector No. 3 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 3 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 3 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 3 driver circuit (Yellow/White wire). If resistance is less than 5 ohms, repair injector No. 3 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 3 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0203: INJECTOR #3 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0203: INJECTOR #3 CONTROL CIRCUIT does not return, DTC P0203: INJECTOR #3 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0204: INJECTOR #4 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0204: INJECTOR #4 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 4 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 4. Using a 12-volt test light connected to ground, probe injector No. 4 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 4 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 4 connector, driver circuit (Light Blue/Brown wire). Using scan tool, actuate injector No. 4 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 4 is actuated, replace injector No. 4. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 4 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 4 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 4 driver circuit (Light Blue/Brown wire) between injector No. 4 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 4 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 4 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 4 driver circuit (Light Blue/Brown wire). If resistance is less than 5 ohms, repair injector No. 4 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 4 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0204: INJECTOR #4 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0204: INJECTOR #4 CONTROL CIRCUIT does not return, DTC P0204: INJECTOR #4 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0205: INJECTOR #5 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0205: INJECTOR #5 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 5 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 5. Using a 12-volt test light connected to ground, probe injector No. 5 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 5 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 5 connector, driver circuit (Gray wire). Using scan tool, actuate injector No. 5 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 5 is actuated, replace injector No. 5. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 5 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 5 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 5 driver circuit (Gray wire) between injector No. 5 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 5 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 5 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 5 driver circuit (Gray wire). If resistance is less than 5 ohms, repair injector No. 5 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 5 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0205: INJECTOR #5 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0205: INJECTOR #5 CONTROL CIRCUIT does not return, DTC P0205: INJECTOR #5 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0206: INJECTOR #6 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0206: INJECTOR #6 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 6 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 6. Using a 12-volt test light connected to ground, probe injector No. 6 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 6 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 6 connector, driver circuit (Brown/Dark Blue wire). Using scan tool, actuate injector No. 6 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 6 is actuated, replace injector No. 6. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 6 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 6 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 6 driver circuit (Brown/Dark Blue wire) between injector No. 6 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 6 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 6 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 6 driver circuit (Brown/Dark Blue wire). If resistance is less than 5 ohms, repair injector No. 6 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 6 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0206: INJECTOR #6 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0206: INJECTOR #6 CONTROL CIRCUIT does not return, DTC P0206: INJECTOR #6 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0207: INJECTOR #7 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0207: INJECTOR #7 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 7 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 7. Using a 12-volt test light connected to ground, probe injector No. 7 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 7 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 7 connector, driver circuit (Violet wire). Using scan tool, actuate injector No. 7 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 7 is actuated, replace injector No. 7. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 7 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 7 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 7 driver circuit (Violet wire) between injector No. 7 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 7 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 7 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 7 driver circuit (Violet wire). If resistance is less than 5 ohms, repair injector No. 7 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 7 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0207: INJECTOR #7 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0207: INJECTOR #7 CONTROL CIRCUIT does not return, DTC P0207: INJECTOR #7 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0208: INJECTOR #8 CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0208: INJECTOR #8 CONTROL CIRCUIT is monitored with battery voltage more than 10.4 volts, ASD relay energized, injector pulse width less than 10 milliseconds, and engine speed less than 3000 RPM. DTC may be stored in Powertrain Control Module (PCM) .64-10 seconds after PCM does not sense inductive kick 18 milliseconds after injector is turned off and no other injectors are turned on. Possible causes are: defective ASD relay, defective injector, defective PCM, defective connectors or defective wiring.

1. Start engine and allow it to idle for 20 seconds. Turn engine off. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 7).
2. Turn ignition off. Disconnect injector No. 8 connector. Clean and/or repair connector as necessary. Turn ignition on. Using scan tool, actuate injector No. 8. Using a 12-volt test light connected to ground, probe injector No. 8 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in ASD relay output circuit. Perform TEST VER-5A. NOTE: Use an analog voltmeter in this step. Pay careful attention to voltmeter needle when injector is actuated.
3. Turn ignition off. Ensure injector No. 8 connector is still disconnected. Connect positive voltmeter lead to 12-volt source. Connect negative voltmeter lead to injector No. 8 connector, driver circuit (Gray/Light Blue wire). Using scan tool, actuate injector No. 8 while observing voltmeter needle. If voltmeter needle fluctuates when injector No. 8 is actuated, replace injector No. 8. Perform TEST VER-5A. If voltmeter needle does not fluctuate when injector No. 8 is actuated, go to next step.
4. Ensure ignition is off. Ensure injector No. 8 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of injector No. 8 driver circuit (Gray/Light Blue wire) between injector No. 8 connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open injector No. 8 driver circuit. Perform TEST VER-5A. NOTE: A shorted injector driver circuit may also damage injector.
5. Ensure ignition is off. Ensure injector No. 8 and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and injector No. 8 driver circuit (Gray/Light Blue wire). If resistance is less than 5 ohms, repair injector No. 8 driver circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Start engine and allow it to idle. Wiggle wiring harness from injector No. 8 to PCM. If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to misfire or stall. Perform TEST VER-5A. If engine does not misfire or stall while wiggling wiring harness, go to next step.
8. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
9. Ensure ignition is on, with engine off. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0208: INJECTOR #8 CONTROL CIRCUIT returns, visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If DTC P0208: INJECTOR #8 CONTROL CIRCUIT does not return, DTC P0208: INJECTOR #8 CONTROL CIRCUIT does not exist or is an intermittent problem. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P0300: MULTIPLE CYLINDER MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0300: MULTIPLE CYLINDER MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10- 30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0300: MULTIPLE CYLINDER MIS-FIRE returns, go to next step. If DTC P0300: MULTIPLE CYLINDER MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0301: CYLINDER #1 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0301: CYLINDER #1 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0301: CYLINDER #1 MIS-FIRE returns, go to next step. If DTC P0301 CYLINDER #1 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0302: CYLINDER #2 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0302: CYLINDER #2 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0302: CYLINDER #2 MIS-FIRE returns, go to next step. If DTC P0302 CYLINDER #2 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0303: CYLINDER #3 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0303: CYLINDER #3 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0303: CYLINDER #3 MIS-FIRE returns, go to next step. If DTC P0303 CYLINDER #3 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0304: CYLINDER #4 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0304: CYLINDER #4 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0304: CYLINDER #4 MIS-FIRE returns, go to next step. If DTC P0304 CYLINDER #4 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0305: CYLINDER #5 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0305: CYLINDER #5 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0305: CYLINDER #5 MIS-FIRE returns, go to next step. If DTC P0305 CYLINDER #5 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0306: CYLINDER #6 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0306: CYLINDER #6 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0306: CYLINDER #6 MIS-FIRE returns, go to next step. If DTC P0306 CYLINDER #6 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is less than 3000 RPM and engine coolant temperature is not within normal range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0307: CYLINDER #7 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0307: CYLINDER #7 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0307: CYLINDER #7 MIS-FIRE returns, go to next step. If DTC P0307: CYLINDER #7 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is 3000 RPM or less and engine coolant temperature is within normal operating range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Repair as necessary. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0308: CYLINDER #8 MIS-FIRE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0308: CYLINDER #8 MIS-FIRE is monitored with engine running, after successfully performing Crankshaft Position (CKP) sensor learn procedure. DTC may be stored in Powertrain Control Module (PCM) when PCM senses more than 2 percent misfire rate is measured during 2 trips or with a 10-30 percent misfire rate during one trip. Possible causes are: misfire does not return, defective Camshaft Position (CMP) or CKP sensor, improper valve timing, vacuum leak, defective ignition system, engine mechanical problem, fuel contamination, improper fuel pressure or capacity, or defective fuel pump.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If MIS-FIRE GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If MIS-FIRE GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 3).
2. At this time, conditions required to set DTC are present. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Operate vehicle using data in SIMILAR CONDITIONS. While in SIMILAR CONDITIONS screen, go to WHICH CYLINDER IS MIS-FIRING monitor. If scan tool is not counting misfires at this time, go to next step. If scan tool is counting misfires at this time, go to step 4).
3. At this time, engine misfire does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME and SIMILAR CONDITIONS data. Road test vehicle under conditions in FREEZE FRAME and SIMILAR CONDITIONS data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0308: CYLINDER #8 MIS-FIRE returns, go to next step. If DTC P0308: CYLINDER #8 MIS-FIRE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
4. Using scan tool, read and record FREEZE FRAME data. Using freeze frame data, attempt to determine cause of misfire. If adaptive fuel percentages are -15 to 15 percent, go to next step. If adaptive fuel percentages are not -15 to 15 percent, go to step 10).
5. Check for contaminated fuel. Replace fuel and clean fuel system as necessary. Perform TEST VER-5A2. If fuel is okay, go to next step.
6. Perform fuel pressure leak-down test. See «FUEL PRESSURE LEAKDOWN TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-leakdown-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pressure leak-down test passes, go to next step. If fuel pressure leak-down test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
7. Perform fuel pump amperage test. See «FUEL PUMP AMPERAGE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-amperage-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump amperage test passes, go to next step. If fuel pump amperage test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
8. Perform fuel pump capacity test. See «FUEL PUMP CAPACITY TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pump-capacity-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump capacity test passes, go to next step. If fuel pump capacity test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
9. Perform fuel pump pressure test. See «FUEL PRESSURE TEST»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-basic-engine-testing-gasoline__fuel-pressure-test) under FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES - TRUCKS & RWD VANS - GASOLINE article. If fuel pump pressure test passes, test is complete. If fuel pump pressure test does not pass, repair fuel system as necessary. Perform TEST VER-5A2.
10. Using scan tool, read and record FREEZE FRAME and LOAD VALUE data. Using freeze frame data, attempt to determine cause of misfire. If load value is more than 50 percent and engine coolant temperature is within normal operating range, go to next step. If load value is 50 percent or less, and/or engine coolant temperature is not within normal operating range, go to step 14). NOTE: Refer to manufacturer's operation manual for instructions in use of engine analyzer.
11. Ensure engine is off. Connect engine analyzer to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Remove any spark plug wire while observing secondary kV line. If secondary voltage is at least 25,000 volts, go to next step. If secondary voltage is not at least 25,000 volts, replace ignition coil. Perform TEST VER-5A2. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
12. Ensure engine is off. Ensure engine analyzer is still connected to engine. Start engine and allow it to idle. If engine will not idle, maintain constant engine speed at more than idle. Set engine analyzer to read display or parade pattern. Check secondary ignition pattern. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not okay, repair indicated secondary ignition system component as necessary. Perform TEST VER-5A2.
13. Check the following additional items as possible mechanical problems: Engine Vacuum Must Be At Least 13" In Neutral Engine Valve Timing Must Be Within Specification Engine Compression Must Be Within Specification Engine Exhaust System Must Be Free Of Restrictions Engine PCV System Must Flow Freely Engine Drive Sprockets Must Be Properly Positioned Torque Converter Stall Speed Must Be Within Specification Power Brake Booster Must Have No Internal Leaks Fuel Must Be Free Of Contamination Fuel Injectors Must Be Free Of Restrictions Fuel Injector Control Wires Must Be Installed On Correct Injector Repair mechanical problems as necessary. Perform TEST VER-5A2. If no mechanical problems exist, test is complete.
14. Using scan tool, read and record FREEZE FRAME and ENGINE RPM data. Using freeze frame data, attempt to determine cause of misfire. If engine speed is 3000 RPM or less and engine coolant temperature is within normal operating range, go to next step. If engine speed is more than 3000 RPM and engine coolant temperature is within normal operating range, use lab scope to test CMP and CKP sensors, and check valve timing and engine vacuum. Repair as necessary. Perform TEST VER-5A2.
15. Check following items for possible causes of cylinder misfire: Injector Harness Connectors Ignition Coil Circuit Spark Plugs Engine Mechanical Problem PCM Power Grounds Irregular CMP Sensor Signal Irregular CKP Sensor Signal Fuel Injectors Restricted Exhaust Intake Restriction PCM EVAP System EGR System Damaged Trigger Wheel Accessory Drive Belts If any listed possible cause exists, repair as necessary. Perform TEST VER-5A2. If no listed possible cause exists, test is complete.

DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM is monitored during engine cranking. DTC may be stored in Powertrain Control Module (PCM) when PCM senses no Crankshaft Position (CKP) sensor signal during engine cranking, and at least 3 Camshaft Position (CMP) sensor signals have occurred. Possible causes are: defective PCM, defective CKP sensor, defective CMP sensor, defective connectors or defective wiring harness.

Scheme 28

Scheme 29

1. Turn ignition on, with engine off. Using scan tool, read current CKP count and attempt to start engine. If current CKP count changes while attempting to start engine, go to next step. If current CKP count does not change while attempting to start engine, go to step 5).
2. Start engine and allow it to idle. Wiggle wiring harness from CKP sensor and CMP sensor to PCM. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. For CKP sensor location (Scheme 28) For CMP sensor location (Scheme 29) If engine misses or stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to stall. Perform TEST VER-2A. If engine does not miss or stall while wiggling wiring harness, go to next step.
3. Start engine and allow it to idle. Using scan tool in lab scope mode, probe CKP sensor signal circuit (Gray/Black wire). With engine running, wiggle CKP sensor wiring harness and connectors. If lab scope pattern is steady, go to next step. If lab scope pattern is irregular, repair wiring harness or connectors as necessary where wiggling caused an irregular lab scope pattern. If connectors and wiring harness are okay, replace CKP sensor. Perform TEST VER-2A.
4. Turn ignition off. Connect lab scope to CMP sensor. Turn ignition on, with engine off. Check for CMP sensor pulses on lab scope. If CMP sensor does not generate pulses, replace CMP sensor. Perform TEST VER-2A. If CMP sensor generates pulses, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition).
5. Turn ignition off. Disconnect CKP sensor connector. (Scheme 28) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on CKP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4 volts, go to next step. If voltage is 4 volts or less, go to step 11).
6. Ensure ignition is off. Ensure CKP sensor connector is still disconnected. Connect one end of a jumper wire to CKP sensor connector, signal circuit (Gray/Black wire). Turn ignition on, with engine off. Using scan tool, monitor current CKP count when tapping other end of jumper wire to sensor ground circuit (Black/Light Blue wire) several times. If CKP count changes, go to next step. If CKP count does not change, go to step 8).
7. Ensure ignition is off. Remove CKP sensor. (Scheme 28) Inspect flywheel for damage. If flywheel is damaged, repair as necessary. Perform TEST VER-2A. If flywheel is not damaged, replace CKP sensor. Perform TEST VER-2A.
8. Ensure ignition is off. Ensure CKP sensor connector is still disconnected. Connect one end of test light to 12-volt source. Touch other end of test light to sensor ground circuit (Black/Light Blue wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair sensor ground circuit for open or high resistance. Perform TEST VER-2A.
9. Ensure ignition is off. Ensure CKP sensor is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of CKP signal circuit (Gray/Black wire) between CKP sensor and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair CKP signal circuit for open or high resistance. Perform TEST VER-2A.
10. Ensure ignition is off. Ensure CKP sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and CKP sensor, signal circuit (Gray/Black wire). If resistance is less than 5 ohms, repair signal circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, test all power and sensor ground circuits at PCM. Repair as necessary. If circuits are okay, replace PCM. Perform TEST VER-2A.
11. Turn ignition off. Ensure CKP sensor is still disconnected. Disconnect CMP sensor connector. For CMP sensor location (Scheme 29) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on CKP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4 volts, replace CMP sensor. Perform TEST VER-2A. If voltage is 4 volts or less, go to next step.
12. Turn ignition off. Ensure CKP sensor, CMP sensor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and CKP sensor connector, 5-volt supply circuit (Orange wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair CKP sensor 5-volt supply circuit for short to ground. Perform TEST VER-2A.
13. Turn ignition off. Ensure CKP sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance of 5-volt supply circuit (Orange wire) between CKP sensor and PCM. If resistance is 5 ohms or more, repair open 5-volt supply circuit. Perform TEST VER-2A. If resistance is less than 5 ohms, test all power and sensor ground circuits at PCM. Repair as necessary. If circuits are okay, replace PCM. Perform TEST VER-2A.

DTC P0340: NO CAM SIGNAL AT PCM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0340: NO CAM SIGNAL AT PCM is monitored with ignition DTC may be stored in Powertrain Control Module (PCM) when PCM senses 96 Crankshaft Position (CKP) sensor signals and no Camshaft Position (CMP) sensor signal. Possible causes are: no-start condition present, defective camshaft sprocket, defective CMP sensor, defective CKP sensor, defective PCM, defective connectors or defective wiring harness.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 11).
2. Using scan tool, go to sensors screen. While cranking engine, read CAM sensor count. If CAM sensor count changes, go to step 11). If CAM sensor count does not change, go to next step.
3. Turn ignition off. Disconnect CMP sensor connector. (Scheme 29) Clean and/or repair connector as necessary. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
4. Turn ignition off. Ensure CMP sensor connector is still disconnected. Turn ignition on, with engine off. Monitor CAM sensor count while connecting jumper wire between CMP sensor connector, signal circuit (Tan/Yellow wire) and sensor ground circuit (Black/Light Blue wire). If CAM sensor count changes, go to next step. If CAM sensor count does not change, go to step 6).
5. Turn ignition off. Ensure CMP sensor is still disconnected. Turn ignition on, with engine off. Using a voltmeter, check voltage on CMP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4 volts, ensure distributor is turning. Repair as necessary. If distributor is turning, replace CMP sensor. Perform TEST VER-5A. If voltage is 4 volts or less, repair 5-volt supply circuit for open, short to ground or high resistance. Perform TEST VER-5A.
6. Ensure ignition is off. Ensure CMP sensor connector is still disconnected. Connect one end of test light to 12-volt source. Touch other end of test light to CMP sensor connector, sensor ground (Black/Light Blue wire). If test light illuminates, go to next step. If test light does not illuminate, repair open sensor ground circuit (Black/Light Blue wire). Perform TEST VER-5A.
7. Ensure ignition is off. Ensure CMP sensor is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of CMP sensor connector, signal circuit (Tan/Yellow wire) between CMP sensor connector and PCM. If resistance is 5 ohms or more, repair open signal circuit. Perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
8. Ensure ignition is off. Ensure CMP sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and CMP sensor connector, signal circuit (Tan/Yellow wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair signal circuit for short to ground. Perform TEST VER-5A.
9. Ensure ignition is off. Ensure CMP sensor and PCM connectors are still disconnected. Using ohmmeter, check resistance between CMP sensor connector, signal circuit (Tan/Yellow wire) and sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
10. Ensure ignition is off. Ensure CMP sensor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between CMP sensor connector, signal circuit (Tan/Yellow wire) and 5-volt supply circuit (Orange wire). If resistance is less than 5 ohms, repair signal circuit for short to 5-volt supply circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-5A.
11. Attempt to start engine. If engine starts, go to next step. If engine does not start, perform TEST NS-SEL: NO START SELECTION MENU.
12. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
13. Start engine and allow it to idle. Using scan tool in lab scope mode, probe CMP sensor connector, signal circuit (Tan/Yellow wire). While engine is running, wiggle wiring harness and connectors. If lab scope pattern is normal, go to next step. If lab scope pattern is irregular, repair wiring harness or connectors as necessary where wiggling caused an irregular lab scope pattern. If wiring harness and connectors are okay, replace CMP sensor. Perform TEST VER-5A
14. Turn engine off. Connect lab scope to CKP sensor. Turn ignition on, with engine off. Check for pulses generated by CKP sensor. If CKP sensor pulses change, replace CKP sensor. Perform TEST VER-5A. If CKP sensor pulses do not change, using scan tool, go to FREEZE FRAME screen. Use FREEZE FRAME data to determine when fault DTC occurred. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition). Perform TEST VER-5A.

DTC P0351: IGNITION COIL #1 PRIMARY CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0351: IGNITION COIL #1 PRIMARY CIRCUIT is monitored with battery voltage more than 8 volts during engine cranking or more than 12 volts with engine running at less than 2016 RPM, and no coils in dwell when checked. DTC may be stored in Powertrain Control Module (PCM) when PCM senses peak current is not achieved with battery based dwell plus 1.5 milliseconds of diagnostic offset. DTC P0351: IGNITION COIL #1 PRIMARY CIRCUIT takes less than 3 seconds to set with engine cranking, or up to 6 seconds with engine running. Possible causes are: defective ignition coil, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If WARM UP CYCLE COUNTER is displayed and displayed count is "0", go to next step. If WARM UP CYCLE COUNTER is not displayed or displayed count is not "0", go to step 8).
2. Turn ignition off. Disconnect ignition coil No. 1 connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, actuate ignition coil No. 1. Connect one end of test light to ground source. Touch other end of test light to ignition coil No. 1 connector, ASD relay output circuit (Dark Green/Orange wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair ASD relay output circuit for open or high resistance. Perform TEST VER-5A.
3. Turn ignition off. Ensure ignition coil connector is still disconnected. Connect one end of test light to 12-volt source. Touch other end of test light to ignition coil No. 1 connector, driver circuit (Gray wire) while cranking engine. If test light does not blink or flicker, go to next step. If test light blinks or flickers, replace ignition coil. Perform TEST VER-5A.
4. Turn ignition off. Ensure ignition coil connector is still disconnected. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
5. Ensure ignition is off. Ensure ignition coil No. 1 connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of ignition coil No. 1 driver circuit (Gray wire) between ignition coil No. 1 and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in ignition coil No. 1 driver circuit. Perform TEST VER-5A.
6. Ensure ignition is off. Ensure ignition coil and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and ignition coil No. 1 connector, driver circuit (Gray wire). If resistance is 5 ohms or more, repair driver circuit for short to ground. Perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
7. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
8. Turn ignition off. Disconnect coil wire at distributor cap. Connect spark plug cable to spark tester. Connect spark tester to known-good ground. Turn ignition on, with ignition off. Using scan tool, actuate ignition coil No. 1 while wiggling wiring harness from ignition coil No. 1 to PCM. If spark becomes erratic or stops, repair wiring harness where wiggling caused spark to become erratic or stop. Perform TEST VER-5A. If spark does not become erratic or stop, go to next step.
9. Turn ignition off. Ensure ignition coil No. 1 connector is still disconnected. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Inspect wiring harness. Repair harness and/or connector as necessary. Perform TEST VER-5A. If connector is okay, test is complete.

DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY is monitored after engine warms up to 147°F (63.8°C), throttle has been open for 180 seconds at vehicle speed more than 20 MPH, with engine speed 1200-1700 RPM and MAP vacuum 15-20 in. Hg. DTC may be stored in Powertrain Control Module (PCM) when PCM senses catalyst efficiency deteriorated to a predetermined value. Possible causes are: exhaust leak, engine mechanical problem, defective catalytic converter or upstream Heated Oxygen Sensor (HO2S) older than downstream HO2S.

Note. On vehicles equipped with 2 catalytic converters, 1/1 catalytic converter is located behind left exhaust down pipe.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. At this time, DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY returns, go to next step. If DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
3. Start engine and allow it to idle. Check for exhaust leaks between engine and downstream HO2S. Repair exhaust system as necessary. Perform TEST VER-5A3. If exhaust system is okay, go to next step.
4. Check exhaust system for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary and replace catalytic converter. Perform TEST VER-5A3. If engine mechanical condition is okay, go to next step. NOTE: A new downstream HO2S along with an aging upstream HO2S may cause DTC P0420: 1/1 CATALYTIC CONVERTER EFFICIENCY to set.
5. If downstream HO2S has been replaced without replacing upstream HO2S, replace upstream HO2S. Perform TEST VER-5A3. If downstream HO2S has been replaced along with upstream HO2S, replace catalytic converter. Perform TEST VER-5A3.

DTC P0441: EVAP PURGE FLOW MONITOR FAILURE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0441: EVAP PURGE FLOW MONITOR FAILURE is monitored after engine warms up to more than 170°F (76.7°C) in closed loop mode, at idle for 2 minutes and vacuum more than 9.7 in. Hg, transmission in Park (A/T) or Neutral (M/T), at least 1/4 tank of fuel and at altitude less than 8000 feet. DTC may be stored in Powertrain Control Module (PCM) when PCM senses no airflow through Evaporative Emission (EVAP) system. Possible causes are: damaged EVAP purge canister line, defective EVAP purge solenoid, defective EVAP canister, damaged or plugged vacuum hoses.

Note. EVAP purge solenoid may also be referred to as EVAP canister purge solenoid or duty cycle EVAP purge solenoid.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. At this time, DTC P0441: EVAP PURGE FLOW MONITOR FAILURE does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0441: EVAP PURGE FLOW MONITOR FAILURE returns, go to next step. If DTC P0441: EVAP PURGE FLOW MONITOR FAILURE does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.
3. Carefully inspect vacuum hoses for proper routing and pinched or plugged hoses from engine to EVAP purge solenoid and to fuel tank. EVAP purge solenoid is located on a bracket mounted to left front inner fender. A vacuum hose routing schematic can be found on Vehicle Emission Control Information (VECI) label. VECI label is located in engine compartment, in front of radiator. Repair hoses as necessary. Perform TEST VER-5A3. If hoses are okay, go to next step.
4. Remove EVAP purge solenoid. Tap EVAP purge solenoid ports against a clean, solid surface. If foreign material falls out of ports, replace EVAP purge solenoid. Perform TEST VER-5A3. If no foreign material falls out of ports, go to next step.
5. Inspect fuel line from EVAP purge solenoid to EVAP canister for proper connections, cuts or rips. All vehicles are equipped with 2 EVAP canisters. Both canisters are located on a bracket mounted below driver's door well. Repair fuel line as necessary and replace EVAP purge solenoid. Perform TEST VER-5A3. If fuel line is okay, ensure fuel line is clean. Replace EVAP purge solenoid and EVAP canister. Perform TEST VER-5A3.

DTC P0442: EVAP LEAK MONITOR SMALL LEAK DETECTED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0442: EVAP LEAK MONITOR SMALL LEAK DETECTED is monitored immediately after a cold start, with ambient temperature 40-90°F (4.4-32.2°C) and engine coolant temperature within 10°F of ambient temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses a leak .04-.08" (.01-.02 mm) in Evaporative Emission (EVAP) system. Possible causes are: damaged EVAP hose, leaking EVAP system component, leaking Leak Detection Pump (LDP), loose fuel cap, defective secondary seal in fuel filler neck, defective connectors or defective wiring.

Note. EVAP purge solenoid may also be referred to as EVAP canister purge solenoid or duty cycle EVAP purge solenoid.

Note. Replacing PCM will not correct this problem.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. At this time, DTC P0442: EVAP LEAK MONITOR SMALL LEAK DETECTED does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0442: EVAP LEAK MONITOR SMALL LEAK DETECTED returns, go to next step. If DTC P0442: EVAP LEAK MONITOR SMALL LEAK DETECTED does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete. CAUTION: When performing test procedures, keep lighted cigarettes, sparks, flames and other ignition sources away from test area. Ensure fuel tank is at least 1/2 full. Pressurizing fuel tank with less than 3 gallons of gasoline may result in an explosion caused by ignition of fumes. Wear safety glasses during test. If vehicle is not being tested on a hoist, ensure parking brake is applied and all wheels are blocked before starting test. NOTE: Miller EVAP System Testing Kit (6872A) and Supply Hose (6922) are required to perform EVAP system pressure self-test.
3. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Turn ignition on, with engine off. Using scan tool, go to ENGINE SYSTEM TESTS and select LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. At LEAK DETECTION PUMP TEST, select #3 HOLD PSI. Using hand-held vacuum pump, apply 20 in. Hg to vacuum hose going to LDP. LDP is located on a bracket mounted to left front inner fender. Remove fuel cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Connect EVAP system testing kit positive lead to positive battery terminal. Connect EVAP system testing kit negative lead to negative battery terminal. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reads 14 in. H20, turn PRESSURE HOLD valve to CLOSED. Turn timer off. Note time and pressure. If pressure drops more than 6 in. H20 in 2 minutes, go to next step. If pressure drops 6 in. H20 or less in 2 minutes, go to step 5). NOTE: In addition to Miller EVAP System Testing Kit (6872A) and Supply Hose (6922), Ultrasonic Leak Detector (6904) is required to perform this step.
4. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Turn ignition on, with engine off. Using scan tool, go to ENGINE SYSTEM TESTS and select LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. At LEAK DETECTION PUMP TEST, select #3 HOLD PSI. Using hand-held vacuum pump, apply 20 in. Hg to vacuum hose going to LDP. Remove fuel cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Connect EVAP system testing kit positive lead to positive battery terminal. Connect EVAP system testing kit negative lead to negative battery terminal. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to OPEN. Turn EVAP testing kit pump timer on. Move EVAP system kit pressure gauge away from vehicle. Using ultrasonic leak detector, check for leaks at fuel cap, rollover valve, EVAP canister, LDP and EVAP purge solenoid . Repair or replace leaking component(s) as necessary. Perform TEST VER-6A. If no leaks exist, replace LDP. Perform TEST VER-6A.
5. At this time, conditions required to set DTC are not present. Turn ignition off. Visually inspect related connectors, hoses and wiring harness for damage. Repair connectors, hoses and wiring harness as necessary. Perform TEST VER-6A. If connectors, hoses and wiring harness are okay, test is complete.

DTC P0443: EVAP PURGE SOLENOID CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0443: EVAP PURGE SOLENOID CIRCUIT is monitored immediately after ignition is turned on with battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) if actual state of EVAP purge solenoid does not match the intended state when requested to operate by PCM. Possible causes are: defective EVAP purge solenoid, defective PCM, defective connectors or defective wiring.

Note. EVAP purge solenoid may also be referred to as EVAP canister purge solenoid or duty cycle EVAP purge solenoid.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Turn ignition on, with engine off. Using scan tool, determine if DTC matches FREEZE FRAME DTC. If DTC is equal to FREEZE FRAME DTC, go to next step. If DTC is not equal to FREEZE FRAME DTC, repair DTC using FREEZE FRAME data.
3. Turn ignition on, with engine off. Using scan tool, read and record FREEZE FRAME data. Try to duplicate conditions in FREEZE FRAME data. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 9).
4. Turn engine off. Disconnect EVAP purge solenoid connector. EVAP purge solenoid is located on a bracket mounted to left front inner fender. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on EVAP purge solenoid connector, fused ignition switch output circuit (White wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused ignition switch output circuit. Perform TEST VER-5A.
5. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on PCM connector, EVAP purge solenoid control circuit (Pink/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, replace EVAP purge solenoid. Perform TEST VER-5A.
6. Turn ignition off. Ensure EVAP purge solenoid and PCM connectors are still disconnected. Using an ohmmeter, check resistance of EVAP purge solenoid control circuit (Pink/Black wire) between EVAP purge solenoid connector and PCM. If resistance is 5 ohms or more, repair open EVAP purge solenoid circuit . Perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
7. Ensure ignition is off. Ensure EVAP purge solenoid and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, EVAP purge solenoid control circuit (Pink/Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair EVAP purge solenoid control circuit for short to ground. Perform TEST VER-5A.
8. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
9. Turn ignition on, with engine off. Using scan tool, actuate EVAP purge solenoid and wiggle wiring harness from EVAP purge solenoid to PCM. If EVAP purge solenoid stopped actuating while wiggling wiring harness, repair wiring harness where wiggling caused problem to appear. Perform TEST VER-5A. If EVAP purge solenoid did not stop actuating while wiggling wiring harness, go to next step.
10. Turn ignition off. Visually inspect related connectors, hoses and wiring harness for damage. Repair connectors, hoses and wiring harness as necessary. Perform TEST VER-5A. If connectors, hoses and wiring harness are okay, test is complete.

DTC P0455: EVAP LEAK MONITOR LARGE LEAK DETECTED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0455: EVAP LEAK MONITOR LARGE LEAK DETECTED is monitored immediately after a cold start, with ambient temperature 40 -90°F (4.4-32.2°C) and engine coolant temperature within 10°F of ambient temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses a leak .04-.08" (.01-.02 mm) in Evaporative Emission (EVAP) system. Possible causes are: damaged EVAP hose, leaking EVAP system component, leaking Leak Detection Pump (LDP), loose fuel cap, defective secondary seal in fuel filler neck, defective connectors or defective wiring.

Note. Replacing PCM will not correct this problem.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. At this time, DTC P0455: EVAP LEAK MONITOR LARGE LEAK DETECTED does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P0455: EVAP LEAK MONITOR LARGE LEAK DETECTED returns, go to next step. If DTC P0455: EVAP LEAK MONITOR LARGE LEAK DETECTED does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete. CAUTION: When performing test procedures, keep lighted cigarettes, sparks, flames and other ignition sources away from test area. Ensure fuel tank is at least 1/2 full. Pressurizing fuel tank with less than 3 gallons of gasoline may result in an explosion caused by ignition of fumes. Wear safety glasses during test. If vehicle is not being tested on a hoist, ensure parking brake is applied and all wheels are blocked before starting test. NOTE: Miller EVAP System Testing Kit (6872A) and Supply Hose (6922) are required to perform EVAP system pressure self-test.
3. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Turn ignition on, with engine off. Using scan tool, go to ENGINE SYSTEM TESTS and select LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. At LEAK DETECTION PUMP TEST, select #3 HOLD PSI. Using hand-held vacuum pump, apply 20 in. Hg to vacuum hose going to LDP. LDP is located on a bracket mounted to left front inner fender. Remove fuel cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Connect EVAP system testing kit positive lead to positive battery terminal. Connect EVAP system testing kit negative lead to negative battery terminal. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reads 14 in. H20, turn PRESSURE HOLD valve to CLOSED. Turn timer off. Note time and pressure. If pressure drops more than 6 in. H20 in 2 minutes, go to next step. If pressure drops 6 in. H20 or less in 2 minutes, go to step 5). NOTE: In addition to Miller EVAP System Testing Kit (6872A) and Supply Hose (6922), Ultrasonic Leak Detector (6904) is required to perform this step.
4. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Turn ignition on, with engine off. Using scan tool, go to ENGINE SYSTEM TESTS and select LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. At LEAK DETECTION PUMP TEST, select #3 HOLD PSI. Using hand-held vacuum pump, apply 20 in. Hg to vacuum hose going to LDP. Remove fuel cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Connect EVAP system testing kit positive lead to positive battery terminal. Connect EVAP system testing kit negative lead to negative battery terminal. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to OPEN. Turn EVAP testing kit pump timer on. Move EVAP system kit pressure gauge away from vehicle. Using ultrasonic leak detector, check for leaks at fuel cap, rollover valve, EVAP canister, LDP and EVAP purge solenoid. Repair or replace leaking component(s) as necessary. Perform TEST VER-6A. If no leaks exist, replace LDP. Perform TEST VER-6A.
5. At this time, conditions required to set DTC are not present. Turn ignition off. Visually inspect related connectors, hoses and wiring harness for damage. Repair connectors, hoses and wiring harness as necessary. Perform TEST VER-6A. If connectors, hoses and wiring harness are okay, test is complete.

DTC P0460: FUEL LEVEL UNIT NO CHANGE OVER MILES

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0460: FUEL LEVEL UNIT NO CHANGE OVER MILES is monitored with engine running and fuel level is less than 15 percent or more than 85 percent capacity. DTC may be stored in Powertrain Control Module (PCM) when PCM senses low fuel for more than 120 miles, or high fuel level that does not change by at least 10 percent for more than 100 miles. Possible causes are: defective fuel level sensor, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read and record FUEL LEVEL SENDING UNIT voltage. If voltage is 7.0-9.4 volts, go to step 4). If voltage is not 7.0-9.4 volts, go to next step.
2. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
3. Turn ignition off. Add 5 gallons of fuel to fuel tank. Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage decreased at least .2 volt, test is complete. If voltage did not decrease at least .2 volt, replace fuel level sensor. Fuel level sensor is located in fuel pump module, in fuel tank. Perform TEST VER-2A.
4. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
5. Ensure ignition is off. Remove at least 5 gallons of fuel from fuel tank. Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage increased at least .2 volt, test is complete. If voltage did not increase at least .2 volt, replace fuel level sensor. Fuel level sensor is located in fuel pump module, in fuel tank. Perform TEST VER-2A.

DTC P0462: FUEL LEVEL SENDING UNIT VOLTS TOO LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0462: FUEL LEVEL SENDING UNIT VOLTS TOO LOW is monitored with ignition on and with battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses fuel level sensor signal less than .4 volt for 2 seconds. Possible causes are: defective fuel level sensor, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage is less than .4 volt, go to next step. If voltage is .4 volt or more, go to step 8).
2. Turn ignition off. Disconnect fuel pump module connector. Fuel pump module is located in fuel tank. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage is more than 9 volts, go to next step. If voltage is 9 volts or less, go to step 5). NOTE: Fuel tank must be lowered to remove fuel pump module. Partially draining fuel tank may be necessary prior to removal. Fuel system may be under high pressure. Release fuel pressure prior to opening fuel system.
3. Turn ignition off. Ensure fuel pump module connector is still disconnected. Remove fuel pump module. Position fuel gauge float in down (empty) position. Using an ohmmeter, check resistance between low fuel sensor circuit (Light Blue/Black wire) and sensor ground circuit (Black/Light Blue wire). If resistance is not 210-230 ohms, go to next step. If resistance is 210-230 ohms, replace fuel pump module wiring harness. Perform TEST VER-2A.
4. At this time, fuel level sensor is assumed defective. Replace fuel level sensor. Perform TEST VER-2A.
5. Turn ignition off. Ensure fuel pump module connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and PCM connector, fuel level sensor signal circuit (Light Blue/Black wire). If resistance is less than 5 ohms, repair fuel level sensor circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Ensure ignition is off. Ensure fuel pump module and PCM connectors are still disconnected. Using ohmmeter, check resistance between PCM connector, fuel level sensor signal circuit (Light Blue/Black wire) and sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair fuel level sensor signal circuit for short to sensor ground circuit. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
7. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.
8. Turn ignition on, with engine off. Using scan tool, monitor FUEL LEVEL SENDING UNIT voltage while wiggling fuel pump module connector and wiring harness. If voltage changes while wiggling wiring harness, repair wiring harness where wiggling caused voltage to change. Perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
9. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, test is complete.

DTC P0463: FUEL LEVEL SENDING UNIT VOLTS TOO HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0463: FUEL LEVEL SENDING UNIT VOLTS TOO HIGH is monitored with ignition on and with battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses fuel level sensor signal more than 9.4 volts for 2 seconds. Possible causes are: defective fuel level sensor, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage is more than 9.4 volts, go to next step. If voltage is 9.4 volts or less, go to step 8).
2. Turn ignition off. Disconnect fuel pump module connector. Fuel pump module is located in fuel tank. Clean and/or repair connector as necessary. Connect a jumper wire between fuel pump module connector, fuel sensor signal circuit (Light Blue/Black wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage is less than one volt, go to next step. If voltage is one volt or more, go to step 5). NOTE: Fuel tank must be lowered to remove fuel pump module. Partially draining fuel tank may be necessary prior to removal. Fuel system may be under high pressure. Release fuel pressure prior to opening fuel system.
3. Turn ignition off. Ensure fuel pump module connector is still disconnected. Remove fuel pump module. Position fuel gauge float in up (full) position. Using an ohmmeter, check resistance between fuel pump module, fuel level sensor signal circuit (Light Blue/Black wire) and sensor ground circuit (Black/Light Blue wire). If resistance is not 10-30 ohms, go to next step. If resistance is 10-30 ohms, replace fuel pump module wiring harness. Perform TEST VER-2A.
4. At this time, fuel level sensor is assumed defective. Replace fuel level sensor. Fuel sensor is located in fuel pump module. Perform TEST VER-2A.
5. Turn ignition off. Disconnect fuel pump module connector. Clean and/or repair connector as necessary. Connect a jumper wire between ground and fuel pump module connector, fuel level sensor signal circuit (Light Blue/Black wire). Turn ignition on, with engine off. Using scan tool, read FUEL LEVEL SENDING UNIT voltage. If voltage is less than one volt, repair open sensor ground circuit. Perform TEST VER-2A. If voltage is one volt or more, go to next step.
6. Turn ignition off. Ensure fuel pump module connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of fuel level sensor signal circuit (Light Blue/Black wire) between fuel pump module connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open fuel level sensor signal circuit. Perform TEST VER-2A.
7. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.
8. Turn ignition on, with engine off. Using scan tool, monitor FUEL LEVEL SENDING UNIT voltage while wiggling fuel pump module connector and wiring harness. If voltage changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused voltage to change. Perform TEST VER-2A. If voltage does not change while wiggling wiring harness, go to next step.
9. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, test is complete.

DTC P0500: NO VEHICLE SPEED SENSOR SIGNAL

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0500: NO VEHICLE SPEED SENSOR SIGNAL is monitored continuously with engine running. DTC may be stored in Powertrain Control Module (PCM) when PCM senses output shaft speed more than 64 RPM, engine coolant temperature more than 104°F (40°C), MAP vacuum 15-16 in. Hg, engine speed more than 1500 RPM and no vehicle speed signal from Controller Anti-Lock Brake (CAB) module for more than 15 seconds for 2 consecutive trips. Possible causes are: CAB module DTCs are present, defective CAB module, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step. WARNING: Keep hands and feet clear of rotating wheels.
2. Turn ignition off. This DTC is an intermittent condition. DTC is displayed in WARM UP CYCLE screen. Raise and support vehicle so wheels are free to rotate. Start engine and allow it to idle. Using scan tool, read VSS signal. Place transmission in any forward gear and allow wheels to rotate. If scan tool displays more than zero MPH, go to next step. If scan tool displays zero MPH, go to step 4).
3. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair wiring harness and connectors as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, test is complete.
4. Ensure engine is still idling. Using scan tool, read DTCs. If any CAB module DTCs are present, see appropriate ANTI-LOCK article in BRAKES section. If no CAB module DTCs are present, go to next step.
5. Ensure ignition is off. Disconnect CAB module connector. CAB module is located on top of Hydraulic Control Unit (HCU). HCU is mounted to left front inner fender, near brake master cylinder. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Connect one end of a jumper wire to CAB module connector, VSS signal circuit (White/Orange wire). Using scan tool, read VSS signal while briefly tapping other end of jumper wire to ground. If scan tool displays zero MPH, go to next step. If scan tool displays more than zero MPH, replace CAB module. Perform TEST VER-5A.
6. Turn ignition off. Ensure CAB module connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and PCM connector, VSS signal circuit (White/Orange wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair VSS signal circuit for short to ground. Perform TEST VER-5A.
7. Ensure ignition is off. Ensure CAB module connector is still disconnected. Turn ignition on, with engine off. Using a voltmeter, check voltage on VSS signal circuit (White/Orange wire) between ground and CAB module connector. If voltage is more than 6 volts, repair VSS signal circuit for short to voltage. Perform TEST VER-5A. If voltage is 6 volts or less, go to next step.
8. Ensure ignition is off. Ensure CAB module and PCM connectors are still disconnected. Using an ohmmeter, check resistance of VSS signal circuit (White/Orange wire) between CAB module connector and PCM connector. If resistance is more than 5 ohms, repair open VSS signal circuit. Perform TEST VER-5A. If resistance is 5 ohms or less, go to next step.
9. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.

DTC P0505: IAC MOTOR CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0505: IAC MOTOR CIRCUIT is monitored immediately after ignition is turned on with battery voltage more than 11.5 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses a short to ground or battery voltage on any of 4 IAC driver circuits for 100 milliseconds while IAC motor is active. Possible causes are: DTC does not match freeze frame DTC, defective IAC motor, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Determine if DTC matches FREEZE FRAME DTC. If DTC is equal to FREEZE FRAME DTC, go to next step. If DTC is not equal to FREEZE FRAME DTC, repair DTC using FREEZE FRAME data.
3. Road test vehicle under conditions in FREEZE FRAME data. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER displayed count changes to "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER displayed count does not change to "0", go to step 26).
4. Start engine and allow it to idle. Disconnect IAC motor connector. IAC motor is located on throttle body. Clean and/or repair connector as necessary. Using a voltmeter, check voltage on IAC motor connector, driver No. 1 circuit (Gray/Red wire). If voltage goes to more than 5 volts at any time, go to next step. If voltage does not go to more than 5 volts at any time, go to step 24).
5. Turn ignition off. Ensure IAC motor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and IAC motor connector, driver No. 4 circuit (Violet/Black wire). If resistance is less than 5 ohms, repair driver No. 4 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. Start engine and allow it to idle. Ensure IAC motor connector is still disconnected. Using a voltmeter, check voltage on IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If voltage goes to more than 5 volts at any time, go to next step. If voltage does not go to more than 5 volts at any time, go to step 21).
7. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and IAC motor connector, driver No. 1 circuit (Gray/Red wire). If resistance is less than 5 ohms, repair driver No. 1 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
8. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair driver No. 2 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
9. Start engine and allow it to idle. Ensure IAC motor connector is still disconnected. Using a voltmeter, check voltage on IAC motor connector, driver No. 3 circuit (Brown/White wire). If voltage goes to more than 5 volts at any time, go to next step. If voltage does not go to more than 5 volts at any time, go to step 19).
10. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and IAC motor connector, driver No. 3 circuit (Brown/White wire). If resistance is less than 5 ohms, repair driver No. 3 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
11. Start engine and allow it to idle. Ensure IAC motor connector is still disconnected. Using a voltmeter, check voltage on IAC motor connector, driver No. 4 circuit (Violet/Black wire). If voltage goes to more than 5 volts at any time, go to next step. If voltage does not go to more than 5 volts at any time, go to step 18).
12. Ensure engine is still idling. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. While monitoring IAC motor operation, wiggle wiring harness from IAC motor to PCM. If idle speed increases and decreases, go to next step. If idle speed does not increase and decrease, go to step 17).
13. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between IAC motor connector, driver No. 1 circuit (Gray/Red wire) and each remaining driver circuit. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together. Perform TEST VER-5A. If resistance is 5 ohms or more between all driver circuits, go to next step.
14. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAC motor connector, driver No. 2 circuit (Yellow/Black wire) and each remaining driver circuit. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together. Perform TEST VER-5A. If resistance is 5 ohms or more between all driver circuits, go to next step.
15. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAC motor connector, driver No. 3 circuit (Brown/White wire) and driver circuit No. 4 (Violet/Black wire). If resistance is less than 5 ohms, repair driver No. 3 circuit for short to driver No. 4 circuit. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
16. Start engine and allow it to idle. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. While monitoring IAC motor operation, wiggle wiring harness from IAC motor to PCM. If IAC motor stops operating at any time while wiggling wiring harness, repair wiring harness where wiggling caused IAC motor to stop operating. Perform TEST VER-5A. If IAC motor does not stop operating at any time while wiggling wiring harness, go to next step.
17. At this time, IAC motor is assumed to be defective. Replace IAC motor. Perform TEST VER-5A.
18. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance of IAC motor connector, driver No. 4 circuit (Violet/Black wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A. If resistance is 5 ohms or more, repair open driver No. 4 circuit. Perform TEST VER-5A.
19. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and IAC motor connector, driver No. 3 circuit (Brown/White wire). If resistance is less than 5 ohms, repair driver No. 3 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
20. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance of IAC motor connector, driver No. 3 circuit (Brown/White wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A. If resistance is 5 ohms or more, repair open driver No. 3 circuit. Perform TEST VER-5A.
21. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and IAC motor connector, driver No. 1 circuit (Gray/Red wire). If resistance is less than 5 ohms, repair driver No. 1 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
22. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If resistance is less than 5 ohms, repair driver No. 2 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
23. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance of IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A. If resistance is 5 ohms or more repair open driver No. 2 circuit. Perform TEST VER-5A.
24. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and IAC motor connector, driver No. 4 circuit (Violet/Black wire). If resistance is less than 5 ohms, repair driver No. 4 circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
25. Turn ignition off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance of IAC motor connector, driver No. 1 circuit (Gray/Red wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A. If resistance is 5 ohms or more, repair open driver No. 1 circuit. Perform TEST VER-5A.
26. Start engine and allow it to idle. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. While monitoring IAC motor operation, wiggle wiring harness from IAC motor to PCM. If IAC motor stops operating at any time while wiggling wiring harness, repair wiring harness where wiggling caused IAC motor to stop operating. Perform TEST VER-5A. If IAC motor does not stop operating at any time while wiggling wiring harness, test is complete.

DTC P0601: INTERNAL CONTROLLER FAILURE

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0601: INTERNAL CONTROLLER FAILURE is monitored with ignition on. DTC may be stored in Powertrain Control Module (PCM) when PCM senses internal checksum for software failed, does not match calculated value. Possible causes are: defective PCM.

Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC P0601: INTERNAL CONTROLLER FAILURE is present, replace PCM. Perform TEST VER-2A. If DTC P0601: INTERNAL CONTROLLER FAILURE is not present, test is complete.

DTC P0622: GENERATOR FIELD NOT SWITCHING PROPERLY

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0622: GENERATOR FIELD NOT SWITCHING PROPERLY is monitored with engine running. DTC may be stored in Powertrain Control Module (PCM) when PCM senses attempts to regulate generator field indicate no result during monitoring. Possible causes are: defective generator, defective PCM, defective connector or defective wiring.

Scheme 30

1. Turn ignition on, with engine off. Using scan tool, read and record DTCs and FREEZE FRAME data, and then erase DTCs. Turn ignition off. Visually inspect related connectors for corroded, damaged, pushed-out or miswired terminals. Clean and/or repair connectors as necessary. Turn ignition on, with engine off. Using scan tool, actuate Generator (GEN) field driver circuit. Using a 12-volt test light connected to ground, probe GEN field driver circuit (Dark Green/White wire) at back of generator. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair GEN field driver circuit for open or high resistance. Perform TEST VER-3A.
2. Turn ignition on, with engine off. Using scan tool, actuate Generator (GEN) field driver circuit. Using a 12-volt test light connected to ground, probe GEN field driver circuit (Dark Green/White wire) at back of generator. If test light blinks, go to next step. If test light does not blink, go to step 5).
3. Turn ignition on, with engine off. Using scan tool, actuate GEN field driver circuit. Read and record DTCs. Wiggle wiring harness from generator to PCM while actuating GEN field driver circuit. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If DTC P0622: GENERATOR FIELD NOT SWITCHING PROPERLY returns, repair wiring harness where wiggling caused DTC to return. Perform TEST VER-3A. If DTC P0622: GENERATOR FIELD NOT SWITCHING PROPERLY does not return, go to next step.
4. Turn ignition off. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-3A. If connectors and wiring harness are okay, test is complete.
5. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Disconnect GEN field terminals connector at back of generator. Disconnect battery. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance across GEN field terminals. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair or replace generator as necessary. Perform TEST VER-3A.
6. Ensure ignition is off. Ensure PCM and GEN field terminal connectors are still disconnected. Ensure battery is still disconnected. Using ohmmeter, check resistance of GEN field driver circuit (Dark Green/White wire) between PCM and generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open GEN field driver circuit. Perform TEST VER-3A.
7. Ensure ignition is off. Ensure PCM and GEN field terminal connectors are still disconnected. Ensure battery is still disconnected. Using ohmmeter, check resistance between ground and GEN connector, field driver circuit (Dark Green/White wire). If resistance is less than 5 ohms, repair field driver circuit for short to ground. Perform TEST VER-3A. If resistance is 5 ohms or more, go to next step.
8. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.

DTC P0645: A/C CLUTCH RELAY CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P0645: A/C CLUTCH RELAY CIRCUIT is monitored with ignition switch in RUN position and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses an open or short in A/C clutch relay control circuit. Possible causes are: defective A/C clutch relay, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, actuate A/C clutch relay. A/C clutch relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. If A/C clutch relay clicks, go to next step. If A/C clutch relay does not click, go to step 4).
2. Ensure ignition is on, with engine off. Wiggle wiring harness from A/C clutch relay to PCM while actuating A/C clutch relay. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If A/C clutch relay stops clicking at any time while wiggling wiring harness, repair wiring harness where wiggling caused A/C clutch relay to stop clicking. Perform TEST VER-2A. If A/C clutch relay does not stop clicking at any time while wiggling wiring harness, go to next step.
3. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, test is complete.
4. Turn ignition off. Remove A/C clutch relay. A/C clutch relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance between A/C clutch relay terminals No. 85 and 86. If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace A/C clutch relay. Perform TEST VER-2A.
5. Ensure ignition is off. Ensure A/C clutch relay is still removed. Turn ignition on, with engine off. Using a 12-volt test light connected to ground, probe A/C clutch relay connector, fused ignition switch output circuit (Red/Yellow wire). If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in fused ignition switch output circuit. Perform TEST VER-2A.
6. Ensure ignition is off. Ensure A/C clutch relay is still removed. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of A/C clutch relay control circuit (Dark Blue/Orange wire) between A/C clutch relay and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open A/C clutch relay control circuit. Perform TEST VER-2A.
7. Ensure ignition is off. Ensure A/C clutch relay and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, A/C clutch relay control circuit (Dark Blue/Orange wire). If resistance is less than 5 ohms, repair A/C clutch relay control circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
8. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.

DTC P1195: SLOW 1/1 O2S DURING CATALYST MONITOR

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1195: SLOW 1/1 O2S DURING CATALYST MONITOR is monitored with engine running, engine coolant temperature more than 170°F (76.7°C), open throttle, vehicle speed is steadily increased more than 18 MPH but less than 55 MPH, and light engine load exists for at least 5 minutes. DTC may be stored in Powertrain Control Module (PCM) when PCM senses 1/1 Heated Oxygen Sensor (HO2S) is switching from less than .39 volt to more than .6 volt fewer times than required. Possible causes are: oil or coolant consumption, defective 1/1 HO2S, defective connector or defective wiring.

Note. 1/1 HO2S is located in upstream position.

1. Start engine and allow it to idle. Check exhaust system for excessive smoke caused by oil or coolant consumption. Repair engine mechanical condition as necessary and replace 1/1 HO2S. Perform TEST VER-5A. If engine mechanical condition is okay, go to next step.
2. Ensure engine is still idling. Check exhaust system for leaks between engine and catalytic converter. Repair exhaust system as necessary. Perform TEST VER-5A. If exhaust system is okay, go to next step.
3. Turn ignition off. Disconnect 1/1 HO2S connector. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance between ground and 1/1 HO2S connector, sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open sensor ground circuit. Perform TEST VER-5A.
4. Turn ignition off. Ensure 1/1 HO2S connector is still disconnected. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
5. Ensure ignition is off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. Perform TEST VER-5A. If connectors are okay, go to next step.
6. At this time, 1/1 HO2S is assumed to be defective. Replace 1/1 HO2S. Perform TEST VER-5A.

DTC P1281: ENGINE IS COLD TOO LONG

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1281: ENGINE IS COLD TOO LONG is monitored with engine running. DTC may be stored in Powertrain Control Module (PCM) when PCM senses engine coolant temperature does not reach 176°F (80°C) while driving for 20 minutes after start. Possible causes are: defective thermostat or cooling system problem.

Start engine and allow it to idle. Road test vehicle under normal operating conditions for 20 minutes. Using scan tool, read engine coolant temperature. If scan tool does not read at least 176°F (80°C), check thermostat and cooling system for probable causes. If scan tool reads at least 176°F (80°C), test is complete.

DTC P1282: FUEL PUMP RELAY CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1282: FUEL PUMP RELAY CONTROL CIRCUIT is monitored with ignition on and battery voltage more than 10 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses an open or short condition in fuel pump relay control circuit. Possible causes are: defective fuel pump relay, defective PCM, defective connector or defective wiring

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If WARM UP CYCLE COUNTER is displayed and displayed count is "0", go to step 5). If WARM UP CYCLE COUNTER is not displayed or displayed count is not "0", go to next step.
2. Turn ignition on, with engine off. Using scan tool, actuate fuel pump relay. Fuel pump relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. If fuel pump relay clicks, go to next step. If fuel pump relay does not click, go to step 5).
3. Ensure ignition is on, with engine off. Wiggle wiring harness from fuel pump relay to PCM while actuating fuel pump relay. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If fuel pump relay stops clicking at any time while wiggling wiring harness, repair wiring harness where wiggling caused fuel pump relay to stop clicking. Perform TEST VER-2A. If fuel pump relay does not stop clicking at any time while wiggling wiring harness, go to next step.
4. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
5. Ensure ignition is off. Remove fuel pump relay. Fuel pump relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance between fuel pump relay terminals No. 85 and 86. If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace fuel pump relay. Perform TEST VER-2A.
6. Ensure ignition is off. Ensure fuel pump relay is still removed. Turn ignition on, with engine off. Using a voltmeter, check voltage on fuel pump relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused ignition switch output circuit. Perform TEST VER-2A.
7. Ensure ignition is off. Ensure fuel pump relay is still removed. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of fuel pump relay control circuit (Brown wire) between fuel pump relay and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open fuel pump relay control circuit. Perform TEST VER-2A.
8. Ensure ignition is off. Ensure fuel pump and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, fuel pump relay control circuit (Brown wire). If resistance is less than 5 ohms, repair fuel pump relay control for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. At this time PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.

DTC P1294: TARGET IDLE NOT REACHED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1294: TARGET IDLE NOT REACHED is monitored with engine idling, transmission in Drive (A/T), and no MAP or TP sensor DTCs present. DTC may be stored in Powertrain Control Module (PCM) when PCM senses engine speed more than 200 RPM above or 100 RPM below target idle speed for 14 seconds. Three separate failures are required to set a bad trip. Two bad trips are required to set DTC. Possible causes are: vacuum leak, defective throttle body, throttle plate or linkage improperly positioned, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Determine if DTC matches FREEZE FRAME data. If DTC is equal to FREEZE FRAME data, go to next step. If DTC is not equal to FREEZE FRAME DTC, repair DTC using FREEZE FRAME data. Perform TEST VER-5A.
3. Using scan tool, read FREEZE FRAME data. Road test vehicle and try to duplicate conditions in FREEZE FRAME data. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", conditions required to set DTC are not present at this time. Operate vehicle for one DTC SPECIFIC GOOD TRIP, and then erase DTCs.
4. Start engine and allow it to idle for 60 seconds. Using scan tool, go to SYSTEM TESTS and select IAC WIGGLE TEST. If idle speed raises and lowers during wiggle test, go to next step. If idle speed does not raise and lower during wiggle test, perform DTC P0505: IAC MOTOR CIRCUIT test. NOTE: The following step is invalid if engine has any vacuum leaks.
5. Ensure engine is still idling. Check engine, brake booster and vacuum hoses for leaks. Ensure PCV valve is operating properly. Repair vacuum leaks or replace PCV valve as necessary. Perform TEST VER-5A. If PCV valve is okay and no vacuum leaks exist, go to next step.
6. Turn engine off. Turn ignition on, with engine off. Ensure throttle plate is fully closed against stop. Check throttle plate and linkage for binding. Repair throttle plate and linkage as necessary. Perform TEST VER-5A. If throttle plate and linkage are okay, go to next step.
7. Turn ignition off. Disconnect PCV valve from intake manifold. Cap vacuum port at intake manifold. Disconnect idle purge hose from throttle body. Install Orifice Tool (6714) on idle purge hose from throttle body. Start engine and allow it to reach normal operating temperature. Using scan tool, actuate MIN AIRFLOW. If engine speed is less than 550 RPM, go to next step. If engine speed is 550 RPM or more, replace throttle body. Perform TEST VER-5A. WARNING: Clean throttle body in well ventilated area and wear rubber gloves.
8. Remove throttle body. While holding throttle open, spray entire throttle body bore with carburetor/throttle body cleaner. Using soft scuff pad, clean throttle body bore and throttle plate. Using compressed air, dry throttle body. Install throttle body. Start engine and allow it to idle. Using scan tool, actuate MIN AIRFLOW. If engine speed is less than 550 RPM, replace throttle body. Perform TEST VER-5A. If engine speed is 550 RPM or more, test is complete.

DTC P1296: NO 5 VOLTS TO MAP SENSOR

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1296: NO 5 VOLTS TO MAP SENSOR is monitored with ignition off and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses MAP sensor voltage drop to less than 2.35 volts with key off for 5 seconds. Possible causes are: defective MAP sensor, defective PCM, defective connectors or defective wiring.

1. Start engine and allow to idle. Using scan tool, read MAP sensor voltage. If voltage is less than.2 volt, go to next step. If voltage is.2 volt or more, go to step 5).
2. Turn engine off. Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than 2.35 volts, go to next step. If voltage is 2.35 volts or more, go to step 7).
3. Turn ignition off. Disconnect MAP sensor connector. (Scheme 26) Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on MAP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4.5 volts, replace MAP sensor. Perform TEST VER-5A. If voltage is 4.5 volts or less, go to next step.
4. Turn ignition off. Ensure MAP sensor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of MAP sensor 5-volt supply circuit (Orange wire) between MAP sensor and PCM. If resistance is less than 5 ohms, go to step 6). If resistance is 5 ohms or more, repair open 5-volt supply circuit. Perform TEST VER-5A.
5. Turn ignition on, with engine off. Using scan tool, read MAP sensor voltage. If voltage is less than 2.35 volts, go to next step. If voltage is 2.35 volts or more, go to step 7).
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
7. Turn ignition off. Inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
8. Turn ignition on, with engine off. Wiggle MAP sensor connector and wiring harness while using scan tool to monitor MAP sensor voltage. If MAP sensor voltage changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused voltage to change. Perform TEST VER-5A. If voltage does not change, go to next step.
9. Conditions required to set DTC are not present at this time. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, test is complete.

DTC P1297: NO CHANGE IN MAP FROM START TO RUN

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1297: NO CHANGE IN MAP FROM START TO RUN is monitored with engine speed 400-1500 RPM and throttle closed. DTC may be stored in Powertrain Control Module (PCM) when PCM senses too small a difference between barometric pressure at ignition on and manifold vacuum with engine running for 8.8 seconds. Possible causes are: defective MAP sensor, defective or restricted vacuum ports, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC P0107: MAP SENSOR VOLTAGE TOO LOW is present, perform DTC P0107: MAP SENSOR VOLTAGE TOO LOW test. If DTC P0107: MAP SENSOR VOLTAGE TOO LOW is not present, go to next step.
2. Start engine and allow it to idle for 30 seconds. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 6).
3. Turn ignition off. Disconnect MAP sensor connector. (Scheme 26) Clean and/or repair connector as necessary. Using a voltmeter, check voltage on MAP sensor connector, 5-volt supply circuit (Orange wire). If voltage is more than 4.5 volts, go to next step. If voltage is 4.5 volts or less, repair open 5-volt supply circuit. Perform TEST VER-5A.
4. Turn ignition off. Remove MAP sensor. Inspect MAP sensor vacuum port for restrictions. Remove restrictions as necessary. Perform TEST VER-5A. If no restrictions exist, go to next step.
5. At this time, MAP sensor is assumed to be defective. Replace MAP sensor. Perform TEST VER-5A.
6. Start engine and allow it to idle. Using scan tool, monitor engine vacuum while snapping throttle open and closed. If vacuum drops rapidly to less than one in. Hg, check for restricted or leaking vacuum to MAP sensor. Check for defective MAP sensor or PCM. Repair as necessary. If vacuum does not drop rapidly to less than one in. Hg, go to next step.
7. Start engine and allow it to idle. Using scan tool, set engine speed to 1500 RPM and read MAP sensor voltage. Wiggle connectors and wiring harness from MAP sensor to PCM. (Scheme 26) PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If engine stall or voltage becomes erratic while wiggling wiring harness, repair connectors and wiring harness as necessary where wiggling caused engine to stall or voltage to become erratic. Perform TEST VER-5A. If engine does not stall and voltage does not become erratic, go to next step.
8. Turn ignition off. Inspect intake manifold and MAP sensor vacuum port and hose for restrictions. Repair restrictions as necessary. Perform TEST VER-5A. If no restrictions exist, go to next step.
9. At this time, MAP sensor is assumed to be defective. Replace MAP sensor. Perform TEST VER-5A.

DTC P1388: ASD RELAY CONTROL CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1388: ASD RELAY CONTROL CIRCUIT is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses an open or short condition in ASD relay circuit. Possible causes are: defective ASD relay, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, actuate ASD relay. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. If ASD relay is clicking, go to next step. If ASD relay is not clicking, go to step 5).
2. Turn ignition off. Inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
3. Start engine and allow it to idle. Wiggle wiring harness from ASD relay to PCM. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If engine stalls while wiggling wiring harness, repair wiring harness as necessary where wiggling caused engine to stall. Perform TEST VER-2A. If engine does not stall while wiggling wiring harness, go to next step.
4. Check FREEZE FRAME data to determine conditions when DTC was set. Road test vehicle to attempt to duplicate FREEZE FRAME conditions. If conditions do not exist, conditions required to set DTC are not present at this time. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, test is complete.
5. Turn ignition off. Remove ASD relay. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on ASD relay connector, fused ignition switch output circuit (Light Green/Black wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused ignition switch output circuit. Perform TEST VER-2A.
6. Turn ignition off. Ensure ASD relay is still removed. Using an ohmmeter, check resistance between ASD relay terminals No. 85 and 86. If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace ASD relay. Perform TEST VER-2A.
7. Ensure ignition is off. Ensure ASD relay is still removed. PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using ohmmeter, check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ASD relay control circuit. Perform TEST VER-2A.
8. Ensure ignition is off. Ensure ASD relay is still removed. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, ASD relay control circuit (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair ASD relay control circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
9. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.

DTC P1389: NO ASD RELAY OUTPUT VOLTAGE AT PCM

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1389: NO ASD RELAY OUTPUT VOLTAGE AT PCM is monitored with ignition on, battery voltage more than 10.4 volts and engine speed more than 40 RPM. DTC may be stored in Powertrain Control Module (PCM) when PCM senses no voltage when ASD relay is energized. Possible causes are: DTC does not match freeze frame DTC, defective ASD relay, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Determine if DTC matches FREEZE FRAME DTC. If DTC is equal to FREEZE FRAME DTC, go to next step. If DTC is not equal to FREEZE FRAME DTC, repair DTC using FREEZE FRAME data.
3. Using scan tool, read and record FREEZE FRAME data. Road test vehicle to try to duplicate FREEZE FRAME data conditions. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 11).
4. Attempt to start engine. If engine starts, go to next step. If engine does not start, go to step 7).
5. Turn ignition off. Remove ASD relay. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Disconnect PCM Gray connector. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance at ASD relay, output circuit (Dark Green/Orange wire) between ASD relay connector and PCM. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open ASD relay output circuit. Perform TEST VER-2A.
6. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.
7. Ensure ignition is off. Remove ASD relay. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on ASD relay connector, fused B+ circuit (Red/White wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused B+ circuit. Perform TEST VER-2A.
8. Ensure ignition is off. Substitute a known-good ASD relay. Attempt to start engine. If engine does not start, go to next step. If engine starts, replace ASD relay. Perform TEST VER-2A.
9. Turn ignition off. Remove ASD relay. Disconnect PCM Gray connector. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of ASD relay, output circuit (Dark Green/Orange wire) between ASD relay connector and PCM. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open ASD relay output circuit. Perform TEST VER-2A.
10. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.
11. Turn ignition off. Conditions required to set DTC are not present at this time. Visually inspect related connectors and wiring harness for damage. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
12. Using scan tool, erase DTCs. Start engine and allow it to idle. Wiggle wiring harness from ASD relay to PCM while monitoring scan tool. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If DTC P1389: NO ASD RELAY OUTPUT VOLTAGE AT PCM returns, repair wiring harness where wiggling caused DTC to return. Perform TEST VER-2A. If DTC P1389: NO ASD RELAY OUTPUT VOLTAGE AT PCM does not return, go to next step.
13. At this time, problem is assumed to be intermittent or inactive. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P1391: INTERMITTENT LOSS OF CMP OR CKP

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1391: INTERMITTENT LOSS OF CMP OR CKP is monitored with engine running or cranking. DTC may be stored in Powertrain Control Module (PCM) when PCM senses FAILURE COUNTER reach 20 failures for 2 consecutive trips. Possible causes are: Crankshaft Position (CKP) sensor improperly installed, defective CKP sensor, defective distributor, defective Camshaft Position (CMP) sensor, recorded lab scope pattern not irregular, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 5).
2. Using scan tool, proceed to FREEZE FRAME screen. If vehicle can be operated under FREEZE FRAME conditions, go to next step. If vehicle cannot be operated under FREEZE FRAME conditions, go to step 5).
3. Using scan tool, read and record FREEZE FRAME data. Using scan tool in LAB SCOPE mode, probe both CMP and CKP sensors. Operate vehicle under FREEZE FRAME parameters. While driving vehicle, wiggle wiring harness (if possible) to try and duplicate condition. If any irregularities in lab scope pattern are present, go to next step. If no irregularities in lab scope pattern are present, go to step 5).
4. Turn engine off. Visually inspect wiring harness for any signs of external damage. Inspect sensor and PCM connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, replace sensor which showed irregular lab scope pattern. Perform TEST VER-5A.
5. Using scan tool, proceed to FREEZE FRAME screen. Read and record FREEZE FRAME data. Change scan tool to LAB SCOPE mode. Set both channel No. 1 and channel No. 2 to LAB SCOPE. Using FREEZE FRAME data, operate vehicle under FREEZE FRAME conditions. Use recording function of lab scope. If any irregularities in lab scope pattern are present, go to next step. If no irregularities in lab scope pattern are present, conditions required to set DTC are not present at this time. Erase DTC. Perform TEST VER-5A.
6. Remove connector from sensor which displayed irregular lab scope pattern. Inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, replace sensor which displayed irregular lab scope pattern. Perform TEST VER-5A.

DTC P1398: MISFIRE ADAPTIVE NUMERATOR AT LIMIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1398: MISFIRE ADAPTIVE NUMERATOR AT LIMIT is monitored under closed throttle deceleration, with A/C off, engine coolant temperature more than 176°F (80°C) and more than 50 seconds after engine start. Speed at which deceleration occurs must be with vehicle at more than 36 MPH in first gear or 65 MPH in fourth gear. DTC may be stored in Powertrain Control Module (PCM) when PCM senses one of Crankshaft Position (CKP) sensor target windows has more than 2 percent variance from CKP sensor reference window. Possible causes are: improperly installed CKP sensor, defective CKP sensor, defective flywheel, defective crankshaft, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 5).
2. Ensure ignition is off. Disconnect CKP sensor connector. For CKP sensor location (Scheme 28) Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-5A. If connector is okay, go to next step.
3. Ensure ignition is off. Remove CKP sensor. Inspect flywheel for damage or misalignment. Repair flywheel as necessary. Perform TEST VER-5A. If flywheel is okay, go to next step.
4. At this time, CKP sensor is assumed to be defective. Replace CKP sensor. Perform TEST VER-5A.
5. Turn ignition off. Inspect CKP sensor and connector for damage and proper installation. (Scheme 28) Repair connector or replace CKP sensor as necessary. Perform TEST VER-5A. If CKP sensor and connector are okay, go to next step.
6. Turn ignition on, with engine off. Using scan tool in miscellaneous menu, choose CLEAR PCM. Using scan tool, proceed to MISFIRE PRETEST screen. Road test vehicle to perform relearn adaptive numerator procedure. If relearn adaptive numerator procedure is successful, test is complete. If relearn adaptive numerator procedure is not successful, repeat test. Perform TEST VER-5A.

DTC P1486: EVAP LEAK MON PINCHED HOSE FOUND

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1486: EVAP LEAK MON PINCHED HOSE FOUND is monitored after cold start with ambient temperature of 40-90°F (4.4 -32°C) and engine coolant temperature is within 10°F (-12°C) of ambient temperature. If PCM detects a pinched hose, DTC will not set until system monitors EVAP purge flow. If system does not pass, DTC will set. DTC may be stored in Powertrain Control Module (PCM) when EVAP monitor senses no airflow through EVAP system. Possible causes are: blocked fuel tank -to-EVAP canister hose, blocked Leak Detection Pump (LDP) hose, pinched EVAP purge solenoid-to-EVAP canister hose, blocked LDP or blocked EVAP canister.

Note. Replacing PCM will not correct this problem.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 3). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. At this time, DTC P1486: EVAP LEAK MON PINCHED HOSE FOUND does not exist or is an intermittent problem. Using scan tool, read and record FREEZE FRAME data. Road test vehicle under conditions in FREEZE FRAME data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Using scan tool, read DTCs. If DTC P1486: EVAP LEAK MON PINCHED HOSE FOUND returns, go to next step. If DTC P1486: EVAP LEAK MON PINCHED HOSE FOUND does not return, see «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete. CAUTION: When performing test procedures, keep lighted cigarettes, sparks, flames and other ignition sources away from test area. Ensure fuel tank is at least 1/2 full. Pressurizing fuel tank with less than 3 gallons of gasoline may result in an explosion caused by ignition of fumes. Wear safety glasses during test. If vehicle is not being tested on a hoist, ensure parking brake is applied and all wheels are blocked before starting test. NOTE: Miller EVAP System Testing Kit (6872A) and Supply Hose (6922) are required to perform EVAP system pressure self-test.
3. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Remove fuel tank cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Start engine and allow it to idle. Using scan tool, go to LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reads 14 in. H20, remove vacuum connector from EVAP purge solenoid. EVAP purge solenoid is located on a bracket mounted to left front inner fender. If pressure drops when vacuum connector is removed, go to next step. If pressure does not drop when vacuum is remove, go to step 6).
4. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Remove fuel tank cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Start engine and allow it to idle. Using scan tool, go to LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reads 14 in. H20, remove LDP pump pressure hose from LDP. LDP is located on a bracket mounted to right front inner fender. If pressure drops when pressure hose is removed, replace LDP. Perform TEST VER-6A. If pressure does not drop when pressure hose is removed, go to next step.
5. Inspect LDP hose for damage. Replace LDP hose if necessary. Perform TEST VER-6A. If LDP hose is okay, replace EVAP canister. Perform TEST VER-6A.
6. Reconnect vacuum connector at EVAP purge solenoid. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Remove fuel tank cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Start engine and allow it to idle. Using scan tool, go to LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reads 14 in. H20, remove EVAP canister-to-EVAP purge solenoid hose. If pressure drops when hose is removed, repair pinched hose. Perform TEST VER-6A. If pressure does not drop when hose is removed, go to next step.
7. Using EVAP system testing kit, supply hose and instructions printed on EVAP system testing kit cover, perform EVAP system pressure pump self-test. Remove fuel tank cap. Install one end of supply hose on fuel cap, and then install fuel cap on vehicle. Install other end of supply hose on EVAP system testing kit. Start engine and allow it to idle. Using scan tool, go to LEAK DETECTION PUMP TEST. Read instructions on scan tool and then press ENTER. Set EVAP system testing kit PRESSURE/HOLD valve to OPEN. Set VENT valve to CLOSED. While monitoring EVAP system testing kit pressure gauge, turn EVAP system testing kit pump timer on. When pressure gauge reads 14 in. H20, remove EVAP canister-to-fuel tank hose. If pressure drops when hose is removed, replace EVAP canister. Perform TEST VER-6A. If pressure does not drop when hose is removed, repair pinched hose. Perform TEST VER-6A.

DTC P1492: AMBIENT/BTS V TOO HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1492: AMBIENT/BTS V TOO HIGH is monitored with ignition on. DTC may be stored in Powertrain Control Module (PCM) when PCM senses voltage from Battery Temperature Sensor (BTS) less than .5 volt or more than 4.9 volts for 3 seconds. Possible causes are: defective BTS, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is less than .5 volt, go to next step. If voltage is .5 volt or more, go to step 6).
2. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is 4 volts or less, go to next step. If voltage is more than 4 volts, replace BTS. Perform TEST VER-5A.
3. Turn ignition off. Ensure BTS connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and BTS signal circuit (Pink/Yellow wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair BTS signal circuit for short to ground. Perform TEST VER-5A.
4. Turn ignition off. Ensure BTS and PCM connectors are still disconnected. Using ohmmeter, check resistance between BTS connector, signal circuit (Pink/Yellow wire) and sensor ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
6. Ensure ignition is on, with engine off. Using scan tool, read BTS voltage. If voltage is more than 4.9 volts, go to next step. If voltage is 4.9 volts or less, go to step 12).
7. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Connect a jumper wire between BTS connector, signal circuit (Pink/Yellow wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace BTS. Perform TEST VER-5A.
8. Turn ignition off. Ensure BTS connector is still disconnected. Connect a jumper wire between ground and BTS connector, sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, repair open sensor ground circuit. Perform TEST VER-5A.
9. Turn ignition off. Ensure BTS connector is still disconnected. Turn ignition on, with engine off. Using a voltmeter, check voltage on BTS connector, signal circuit (Pink/Yellow wire). If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair signal circuit for short to voltage. Perform TEST VER-5A.
10. Turn ignition off. Ensure BTS connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of BTS signal circuit (Pink/Yellow wire) between BTS connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open BTS signal circuit. Perform TEST VER-5A.
11. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
12. Turn ignition on, with engine off. Using scan tool, read and monitor BTS voltage while wiggling sensor wiring harness and connector. If sensor voltage changes, repair wiring harness or connector where wiggling caused voltage change. Perform TEST VER-5A. If sensor voltage does not change, go to next step.
13. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, test is complete.

DTC P1493: AMBIENT/BTS V TOO LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1493: AMBIENT/BTS V TOO LOW is monitored with engine running at more than 1500 RPM for more than 25 seconds. DTC may be stored in Powertrain Control Module (PCM) when PCM senses voltage from Battery Temperature Sensor (BTS) less than .5 volt or more than 4.9 volts for 3 seconds. Possible causes are: defective BTS defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is less than .5 volt, go to next step. If voltage is .5 volt or more, go to step 6).
2. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is 4 volts or less, go to next step. If voltage is more than 4 volts, replace BTS. Perform TEST VER-5A.
3. Turn ignition off. Ensure BTS connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and BTS signal circuit (Pink/Yellow wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair BTS signal circuit for short to ground. Perform TEST VER-5A.
4. Turn ignition off. Ensure BTS and PCM connectors are still disconnected. Using ohmmeter, check resistance between BTS connector, signal circuit (Pink/Yellow wire) and sensor ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair signal circuit for short to sensor ground circuit. Perform TEST VER-5A.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
6. Ensure ignition is on, with engine off. Using scan tool, read BTS voltage. If voltage is more than 4.9 volts, go to next step. If voltage is 4.9 volts or less, go to step 12).
7. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Connect a jumper wire between BTS connector, signal circuit (Pink/Yellow wire) and sensor ground circuit (Black/Light Blue wire). Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace BTS. Perform TEST VER-5A.
8. Turn ignition off. Ensure BTS connector is still disconnected. Connect a jumper wire from sensor ground to engine ground. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, repair open sensor ground circuit. Perform TEST VER-5A.
9. Turn ignition off. Ensure BTS connector is still disconnected. Turn ignition on, with engine off. Using a voltmeter, check voltage on BTS connector, signal circuit (Pink/Yellow wire). If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair signal circuit for short to voltage. Perform TEST VER-5A.
10. Turn ignition off. Ensure BTS connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of BTS signal circuit (Pink/Yellow wire) between BTS connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open BTS signal circuit. Perform TEST VER-5A.
11. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
12. Turn ignition on, with engine off. Using scan tool, read and monitor BTS voltage while wiggling sensor wiring harness and connector. If sensor voltage changes, repair wiring harness or connector where wiggling caused voltage change. Perform TEST VER-5A. If sensor voltage does not change, go to next step.
13. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, test is complete.

DTC P1494: LEAK DETECTION PUMP SW OR MECH FAULT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1494: LEAK DETECTION PUMP SW OR MECH FAULT is monitored immediately after a cold start, with ambient temperature 40 -90°F (4.4-32.2°C) and engine coolant temperature within 10°F (-12.2°C) of ambient temperature. DTC may be stored in Powertrain Control Module (PCM) when PCM senses state of Leak Detection Pump (LDP) switch is not in expected state at ignition on, with engine off, or following an engine start if a change in switch state is not sensed when LDP solenoid is energized to pull LDP diaphragm to up position. Possible causes are: defective LDP, defective PCM, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Determine if DTC matches FREEZE FRAME DTC. If DTC is equal to FREEZE FRAME DTC, go to next step. If DTC is not equal to FREEZE FRAME DTC, repair DTC using FREEZE FRAME data.
3. Using scan tool, read and record FREEZE FRAME data. Road test vehicle to try to duplicate FREEZE FRAME data conditions. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 10).
4. Turn ignition off. Disconnect LDP connector. Disconnect engine vacuum supply hose at LDP. LDP is located on a bracket mounted to right front inner fender, near battery. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on ASD relay connector, fused ignition switch output circuit (Light Green/Black wire). ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused ignition switch output circuit. Perform TEST VER-5A. NOTE: LDP pressure switch sense circuit may also be referred to as LDP switch sense circuit.
5. Turn ignition off. Ensure LDP connector and vacuum hose are still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and PCM connector, LDP pressure switch sense circuit (Orange wire). If resistance is less than 5 ohms, repair LDP pressure switch sense circuit for short to ground. Perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
6. Ensure ignition is off. Ensure LDP connector and vacuum hose are still disconnected. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance of LDP pressure switch sense circuit (Orange wire) between LDP and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open LDP pressure switch sense circuit. Perform TEST VER-5A.
7. Ensure ignition is off. Reconnect LDP connector. Ensure vacuum hose is still disconnected. Ensure PCM connectors are still disconnected. Connect a jumper wire between ground and PCM connector, LDP solenoid control circuit (White/Dark Green wire). Turn ignition on, with engine off. Connect a hand-held vacuum pump to LDP. Using a voltmeter, monitor voltage on PCM connector, LDP pressure switch sense circuit (Orange wire) while applying vacuum to LDP. If voltage changes when vacuum is applied, go to next step. If voltage does not change when vacuum is applied, replace LDP. Perform TEST VER-5A.
8. Turn ignition off. Disconnect LDP connector. Ensure vacuum hose are still disconnected. Ensure PCM connectors are still disconnected. Connect a vacuum gauge between engine vacuum supply hose and LDP. Start engine and allow it to idle. Read vacuum gauge. If vacuum gauge reads within one in. Hg of engine vacuum, go to next step. If vacuum gauge does not read within one in. Hg of engine vacuum, repair leak or obstruction in engine vacuum supply hose. Perform TEST VER-5A.
9. At this time PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
10. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
11. Start engine and allow it to idle. Using scan tool, go to LEAK DETECTION PUMP TEST. Select LDP SWITCH TEST. While monitoring LDP switch state, wiggle wiring harness from LDP to PCM. If LDP switch state does not stop toggling while wiggling wiring harness, test is complete. If LDP switch state stops toggling while wiggling wiring harness, repair wiring harness where wiggling caused toggling to stop. Perform TEST VER-5A.

DTC P1495: LEAK DETECTION PUMP SOLENOID CIRCUIT

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1495: LEAK DETECTION PUMP SOLENOID CIRCUIT is monitored with ignition on and battery voltage more than 10.4 volts. DTC may be stored in Powertrain Control Module (PCM) when PCM senses state of Leak Detection Pump (LDP) solenoid does not change. Possible causes are: defective LDP, defective PCM, defective LDP solenoid, defective connectors or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, read DTCs. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to step 4). If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to next step.
2. Determine if DTC matches FREEZE FRAME DTC. If DTC is equal to FREEZE FRAME DTC, go to next step. If DTC is not equal to FREEZE FRAME DTC, repair DTC using FREEZE FRAME data.
3. Using scan tool, read and record FREEZE FRAME data. Road test vehicle to try to duplicate FREEZE FRAME data conditions. If DTC SPECIFIC GOOD TRIP COUNTER is displayed and displayed count is "0", go to next step. If DTC SPECIFIC GOOD TRIP COUNTER is not displayed or displayed count is not "0", go to step 9).
4. Turn ignition off. Disconnect LDP connector. LDP is located on a bracket mounted to right front inner fender, near battery. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on ASD relay connector, fused ignition switch output circuit (Light Green/Black wire). ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused ignition switch output circuit. Perform TEST VER-5A.
5. Turn ignition off. Ensure LDP connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Turn ignition on, with engine off. Using a voltmeter, check voltage on PCM connector, LDP control circuit (White/Dark Green wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, replace LDP. Perform TEST VER-5A.
6. Turn ignition off. Ensure LDP connector is still disconnected. Ensure PCM connectors are still disconnected. Using an ohmmeter, check resistance between ground and PCM connector, LDP control circuit (White/Dark Green wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair LDP control circuit for short to ground. Perform TEST VER-5A.
7. Ensure ignition is off. Ensure LDP connector is still disconnected. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance of LDP control circuit (White/Dark Green wire) between LDP and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open LDP control circuit. Perform TEST VER-5A.
8. At this time PCM is assumed to be defective. Replace PCM. Perform TEST VER-5A.
9. Turn ignition on, with engine off. Using scan tool, actuate LDP solenoid. LDP solenoid is built into LDP. LDP is located on a bracket mounted to right front inner fender, near battery. While wiggling LDP wiring harness from LDP solenoid to PCM, listen to LDP solenoid. If solenoid stops or starts clicking, repair wiring harness where wiggling caused solenoid to stop or start clicking. Perform TEST VER-5A. If solenoid does not stop or start clicking, go to next step.
10. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-5A. If connectors and wiring harness are okay, go to next step.
11. At this time, problem is assumed to be intermittent or inactive. See «INACTIVE DTC CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__inactive-dtc-condition) . Test is complete.

DTC P1594: CHARGING SYSTEM VOLTAGE TOO HIGH

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1594: CHARGING SYSTEM VOLTAGE TOO HIGH is monitored with engine running. DTC may be stored in Powertrain Control Module (PCM) when PCM senses attempts to regulate generator field indicate no field problems but voltage output does not decrease. Possible causes are: defective Battery Temperature Sensor (BTS), defective generator, defective PCM, defective connector or defective wiring.

1. Turn ignition on, with engine off. Using scan tool, actuate Generator (GEN) field driver circuit. Using a voltmeter, backprobe GEN field driver circuit (Dark Green/White wire) at back of generator. If voltage shifts from low to high, go to next step. If voltage does not shift from low to high, go to step 6).
2. Start engine and allow it to idle. Using scan tool, read TARGET CHARGING voltage. If voltage is more than zero, go to next step. If voltage is zero, go to step 4).
3. With engine running, manually set engine speed to 1600 RPM. Using scan tool, read TARGET CHARGING voltage and BATTERY VOLTAGE. Compare readings and monitor voltage for 5 minutes (if necessary). If voltage difference is more than one volt, replace PCM. Perform TEST VER-3A. If voltage difference is not more than one volt, test is complete.
4. Turn ignition on, with engine off. Using scan tool, read Battery Temperature Sensor BTS temperature. Using a thermometer, measure underhood temperature near battery tray. If BTS temperature is within 10 degrees of underhood temperature, go to next step. If BTS temperature is not within 10 degrees of underhood temperature, replace BTS. BTS is located under battery. Perform TEST VER-3A.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.
6. Turn ignition off. Disconnect GEN field terminals connector at back of generator. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance across GEN field terminals. If resistance is less than 5 ohms, repair or replace shorted generator. Perform TEST VER-3A. If resistance is 5 ohms or more, go to next step.
7. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Disconnect GEN field terminals connector at back of generator. (Scheme 30) Disconnect battery. Clean and/or repair connectors as necessary. Using ohmmeter, check resistance between ground and PCM connector, GEN field driver circuit (Dark Green/White wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair GEN field driver circuit for short to ground. Perform TEST VER-3A.
8. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.

DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW is monitored with engine running at more than 1500 RPM for more than 25 seconds. DTC may be stored in Powertrain Control Module (PCM) when PCM senses attempts to regulate generator field indicate no field problems but voltage output does not increase. Possible causes are: defective Battery Temperature Sensor (BTS), defective generator, defective PCM, defective connector or defective wiring.

1. Turn ignition off. Ensure battery is fully charged and generator belt and tension are okay. Start engine and allow it to idle. Using scan tool, read TARGET CHARGING voltage. If voltage is more than 15.1 volts, go to next step. If voltage is 15.1 volts or less, go to step 5).
2. Turn ignition on, with engine off. Start engine and allow it to idle. Using scan tool, read BTS temperature. Using a thermometer, measure underhood temperature near battery tray. If BTS temperature is not within 10 degrees of underhood temperature, go to next step. If BTS temperature is within 10 degrees of underhood temperature, go to step 5).
3. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Connect jumper wire across BTS terminals. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is zero, replace BTS. Perform TEST VER-3A. If voltage is not zero, go to next step.
4. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.
5. Ensure engine is still idling Turn all accessories off. Manually set engine speed to 1600 RPM. Using scan tool, read TARGET CHARGING voltage and CHARGING voltage. Compare readings and monitor voltage. If voltage difference is more than one volt, go to next step. If voltage difference is not more than one volt, go to step 13).
6. Ensure engine is still idling Using a voltmeter, check voltage between positive battery terminal on generator and positive battery post. If voltage is more than .4 volt, repair power circuit between generator and battery for high resistance. Perform TEST VER-3A. If voltage is .4 volt or less, go to next step.
7. Turn engine off. Turn ignition on, with engine off. Using scan tool, actuate Generator (GEN) field driver circuit. Using a voltmeter, check voltage on both generator field terminals. If voltage is less than 3 volts at either terminal, go to next step. If voltage is 3 volts or more at both terminals, charging system is okay at this time. Perform TEST VER-3A.
8. Turn ignition off. Using a voltmeter, check voltage between generator case and negative battery post. Start engine and run to normal operating temperature. If voltage is .1 volt or less, go to next step. If voltage is more than .1 volt, repair generator ground circuit for high resistance. Perform TEST VER-3A.
9. Turn ignition off. Disconnect battery cables and PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Using an ohmmeter, check resistance between ground and PCM connector, GEN field driver circuit (Dark Green/White wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair GEN field driver circuit for short to ground and replace PCM. Perform TEST VER-3A.
10. Turn ignition off. Ensure battery cables and PCM connectors are still disconnected. Using ohmmeter, check resistance of GEN field driver circuit between PCM and generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open GEN field driver circuit. Perform TEST VER-3A.
11. Turn ignition off. Ensure battery cables and PCM connectors are still disconnected. Using ohmmeter, check resistance of GEN field source circuit (White/Dark Blue wire) between PCM and generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open GEN field source circuit. Perform TEST VER-3A.
12. Turn ignition off. Ensure battery cables and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, GEN field source circuit (White/Dark Blue wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair GEN field source circuit for short to ground and replace PCM. Perform TEST VER-3A.
13. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.
14. Start engine and allow it to idle. Using a voltmeter, check voltage between positive battery terminal on generator and positive battery post. If voltage is more than .4 volt, repair power circuit between generator and battery for high resistance. Perform TEST VER-3A. If voltage is .4 volt or less, go to next step.
15. Turn ignition off. Using a voltmeter, check voltage between generator case and negative battery post. Start engine and run to normal operating temperature. If voltage is .1 volt or less, test is complete. If voltage is more than .1 volt, repair generator ground circuit for high resistance. Perform TEST VER-3A.

DTC P1696: PCM FAILURE EEPROM WRITE DENIED

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1696: PCM FAILURE EEPROM WRITE DENIED is monitored with ignition on. DTC may be stored in Powertrain Control Module (PCM) when PCM's attempt to program/write to internal EEPROM fails. Possible cause is: defective PCM.

1. Turn ignition on, with engine off. Using scan tool, perform SRI MEMORY TEST. If scan tool displays WRITE REFUSED, go to next step. If scan tool does not display WRITE REFUSED, test is complete.
2. Using scan tool, repeat SRI MEMORY TEST. If scan tool displays WRITE REFUSED, replace PCM. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Perform TEST VER-5A. If scan tool does not display WRITE REFUSED, test is complete.

TEST NTC-1A: NO TROUBLE CODE TEST MENU

Select symptom that most accurately describes vehicle's driveability problem. See NO TROUBLE CODE SYMPTOM table. Perform NTC tests that pertain to this symptom. See NO TROUBLE CODE TEST MENU table. Perform NTC test in specified sequence until driveability problem is found.

NO TROUBLE CODE SYMPTOM

NO TROUBLE CODE TEST MENU (1)

NTC-2A: CHECKING SECONDARY IGNITION

Note. Refer to manufacturer's operation manual for instructions in use of engine analyzer.

1. Connect engine analyzer to engine. Start engine and allow engine to idle. If engine will not idle, maintain engine speed at more than idle. Set scope on engine analyzer to read display or parade pattern. Using spray bottle with water, spray spark plug wires while monitoring secondary ignition pattern. If secondary ignition pattern does not change with water being applied, go to next step. If secondary ignition pattern changes with water being applied, replace spark plug wire as necessary. Perform TEST VER-2A. NOTE: Refer to manufacturer's operation manual for pattern analysis procedure.
2. With engine idling, analyze secondary ignition pattern. If engine will not idle, maintain engine speed at more than idle. If secondary ignition pattern is okay, go to next step. If secondary ignition pattern is not correct, repair indicated component in secondary ignition system. Perform TEST VER-2A.
3. With engine idling, momentarily remove and reinstall spark plug wires from spark plugs while observing the secondary ignition kilovolt line. If engine will not idle, maintain engine speed at more than idle. If open circuit secondary ignition voltage is at least 25 kilovolt, secondary ignition system is okay and test is complete. If open circuit secondary ignition voltage is not at least 25 kilovolt, replace ignition coil. Perform TEST VER-2A.

NTC-3A: CHECKING PCM POWER & GROUND CIRCUITS

1. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using a 12-volt test light connected to ground, probe PCM connector, B+ circuit. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open B+ circuit. Perform TEST VER-2A.
2. Ensure ignition is off. Ensure PCM connectors are still disconnected. Turn ignition on, with engine off. Using 12-volt test light connected to ground, probe PCM connector, fused ignition switch output circuit. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open fused ignition switch output circuit. Perform TEST VER-2A.
3. Turn ignition off. Ensure PCM connectors are still disconnected. Using 12-volt test light connected to ground, probe both PCM connector, ground circuits. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly on both circuits, go to next step. If test light does not illuminate brightly on both circuits, repair open ground circuit(s). Perform TEST VER-2A.

NTC-3B: CHECKING ECM POWER & GROUND CIRCUITS

1. Turn ignition off. Disconnect ECM connector. Clean and/or repair connector as necessary. Using a 12-volt test light connected to ground, probe both ECM connector, B+ circuits. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly on both circuits, go to next step. If test light does not illuminate brightly, repair open B+ circuit(s).
2. Ensure ignition is off. Ensure ECM connector is still disconnected. Turn ignition on, with engine off. Using 12-volt test light connected to ground, probe ECM connector, fused ignition switch output circuit. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open fused ignition switch output circuit. 3) Turn ignition off. Ensure ECM connector is still disconnected. Using 12-volt test light connected to ground, probe both ECM connector, ground circuits. For wire color, see WIRING DIAGRAMS article. If test light illuminates brightly on both circuits, go to next step. If test light does not illuminate brightly on both circuits, repair open ground circuit(s).

NTC-4A: CHECKING ENGINE VACUUM

Note. Normal vacuum readings vary according to altitude.

Connect vacuum gauge to engine vacuum source. Start engine and allow engine to idle. Note engine vacuum reading. Engine vacuum should be steady and 13-22 in. Hg with engine at idle. While monitoring engine vacuum reading, quickly open and close the throttle several times and then allow engine to idle. If engine vacuum is within specification, test is complete. If engine vacuum is not within specification, perform NTC-13A: CHECKING ENGINE MECHANICAL SYSTEMS test.

NTC-5A: CHECKING FUEL DELIVERY/PRESSURE

1. Turn ignition off. Inspect fuel lines for leaks, kinks or restrictions. Release fuel pressure and repair or replace fuel lines as necessary. Perform TEST VER-2A. If fuel lines are okay, go to next step.
2. Release fuel pressure. Connect fuel pressure gauge to fuel pressure test port. Using scan tool, actuate fuel system test and note fuel pressure. Fuel pressure should be 44.2-54.2 psi (3.23-3.96 kg/cm 2 ). If fuel pressure is within specification, test is complete. If fuel pressure is not within specification, release fuel pressure and replace fuel pump module. Fuel pump module is located in fuel tank. Perform TEST VER-2A.

NTC-6A: CHECKING ECT SENSOR CALIBRATION

1. Turn ignition on, with engine off. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.6°C) before proceeding. If engine coolant temperature is 150°F (65.6°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82.2°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value increase is erratic, check for cooling system problems and replace ECT sensor. Perform TEST VER-2A.
2. If coolant temperature reaches 180°F (82.2°C) or more, test is complete. If coolant temperature does not reach 180°F (82.2°C) or more, check for cooling system problems and replace ECT sensor. Perform TEST VER-2A.

NTC-6B: CHECKING ECT SENSOR CALIBRATION

Turn ignition on, with engine off. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine coolant temperature is more than 180°F (82.2°C), allow engine coolant temperature to cool down to 150°F (65.6°C) before proceeding. If engine coolant temperature is 150°F (65.6°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82.2°C). If coolant temperature reaches 180°F (82.2°C) or more, test is complete. If coolant temperature does not reach 180°F (82.2°C) or more, check for cooling system problems and replace ECT sensor.

NTC-7A: CHECKING TP SENSOR CALIBRATION

1. Start engine and allow it to idle. Using scan tool, monitor engine speed (RPM) while wiggling Throttle Position (TP) sensor connector and wiring harness. TP sensor is located on throttle body. If RPM changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused RPM to change. Perform TEST VER-2A. If RPM does not change while wiggling connector and wiring harness, go to next step.
2. Turn engine off. Turn ignition on, with engine off. Using scan tool, monitor TP sensor voltage while wiggling TP sensor connector and wiring harness. If TP sensor voltage changes while wiggling connector and wiring harness, repair connector and wiring harness where wiggling caused TP sensor voltage to change. Perform TEST VER-2A. If TP sensor voltage does not change while wiggling connector and wiring harness, go to next step.
3. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. Perform TEST VER-2A. If connectors and wiring harness are okay, go to next step.
4. Turn ignition on with engine off. Using scan tool, monitor TPS voltage while slowly moving throttle from closed position to fully open position. If TPS voltage changes smoothly, go to next step. If TPS voltage does not change smoothly, replace TPS. Perform TEST VER-2A.
5. Ensure ignition is on, with engine off. Close throttle. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TPS voltage with throttle fully closed. If TPS voltage is 1.5 volts or more, replace TPS. Perform TEST VER-2A. If TPS voltage is less than specified, go to next step.
6. Ensure ignition is on, with engine off. Close throttle. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TPS voltage with throttle fully closed. If TPS voltage is 1.5 volts or more, replace TPS. Perform TEST VER-2A. If TPS voltage is less than specified test is complete.

NTC-7B: CHECKING APPS CALIBRATION

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

1. Turn ignition off. Ensure Accelerator Pedal Position Sensor (APPS) and Engine Control Module (ECM) are correctly wired. Rewire miswired connector(s) as necessary. If connectors are correctly wired, go to next step.
2. Turn ignition on, with engine off. Using scan tool, select SENSORS. Monitor APPS voltage while moving throttle lever between upper and lower stops. If voltage varies between one volt with throttle closed and 3 volts with throttle open, test is complete. If voltage does not vary as specified, go to next step.
3. Ensure ignition is on, with engine off. Ensure throttle pedal moves freely between upper and lower stops. If throttle pedal moves freely, go to next step. If throttle pedal does not move freely, repair as necessary.
4. At this time, APPS is assumed to be defective. Replace APPS.

NTC-8A: CHECKING MAP SENSOR CALIBRATION

Turn ignition off. Install vacuum "T" fitting and vacuum gauge at vacuum source on intake manifold. Start engine and allow engine to idle. If engine will not idle, maintain a constant RPM above idle. Note engine vacuum on vacuum gauge. Using scan tool, read MAP sensor vacuum. If MAP sensor vacuum is within one in. Hg of engine vacuum on vacuum gauge, MAP sensor is operating properly. Test is complete. If MAP sensor vacuum is not within one in. Hg of engine vacuum on vacuum gauge, replace MAP sensor. Perform TEST VER-2A.

NTC-8B: CHECKING MAP SENSOR CALIBRATION

Turn ignition off. Install vacuum "T" fitting and pressure gauge at manifold pressure source. Start engine and allow engine to idle. If engine will not idle, maintain a constant RPM above idle. Note engine pressure on pressure gauge. Using scan tool, read MAP sensor pressure. If MAP sensor pressure is within one inch of engine pressure on pressure gauge, MAP sensor is operating properly. Test is complete. If MAP sensor pressure is not within one inch of engine pressure on pressure gauge, replace MAP sensor.

NTC-9A: CHECKING MINIMUM IDLE AIR FLOW

1. Remove air cleaner. Disconnect vacuum hose from PCV valve. Install Vacuum Fitting (6714) in disconnected hose. Disconnect 3/16" EVAP hose from throttle side of body. Cap 3/16" nipple. Start engine and allow it to idle. Allow engine to reach normal operating temperature. Using scan tool, actuate minimum idle airflow and wait for system to stabilize. If engine speed is 500-900 RPM, stop actuation test. Minimum idle airflow is normal. Test is complete. If engine speed is not as specified, go to next step. WARNING: Clean throttle body in well ventilated area and wear rubber gloves.
2. Stop actuation test. Turn engine off. Remove throttle body. While holding throttle open, spray entire throttle body bore with carburetor/throttle body cleaner. Using soft scuff pad, clean throttle body bore and throttle plate. Using compressed air, dry throttle body. Install throttle body. Start engine and allow it to idle. Using scan tool, actuate minimum idle airflow. If engine speed is 500-900 RPM, test is complete. If engine speed is not as specified, go to next step. NOTE: A vacuum leak may cause IAC motor not to perform correctly.
3. Start engine and allow it to idle. Check engine, brake booster and vacuum hoses for leaks. Repair vacuum leaks as necessary. Perform TEST VER-2A. If no vacuum leaks exist at this time, throttle body is assumed to be defective. Replace throttle body. Perform TEST VER-2A.

NTC-10A: CHECKING HO2S SWITCHING

Note. 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models with 2 upstream HO2S, 1/1 HO2S is located in left upstream position. 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position. 2/1 HO2S is located in right upstream position on models with 2 upstream HO2S.

Note. 1/2 and 1/3 HO2S switching should be slower than 1/1 or 2/1 HO2S switching.

1. Start engine and allow it to idle. Allow engine to reach normal operating temperature. Using scan tool, read HO2S states. If HO2S states are switching between RICH and LEAN, system is functioning properly. Test is complete. If either HO2S is not switching between RICH and LEAN, go to next step.
2. If either HO2S is locked on LEAN, go to next step. If neither HO2S is locked on LEAN, go to step 8).
3. Ensure engine is still idling. Check engine, brake booster and vacuum hoses for leaks. Repair vacuum leaks as necessary. Perform TEST VER-2A. If no vacuum leaks exist, go to next step.
4. Ensure engine is still idling. Using scan tool, read HO2S voltages. If voltage is less than .1 volt for any HO2S, go to next step. If voltage is more than l1 volt for all HO2S, go to step 7). NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
5. Turn ignition off. Disconnect suspected HO2S connector. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and suspected HO2S connector, signal circuit. If resistance is less than 5 ohms, repair signal circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. At this time, suspected HO2S is assumed to be defective. Replace HO2S. Perform TEST VER-2A. NOTE: 1/2 and 1/3 HO2S switching should be slower than 1/1 or 2/1 HO2S switching.
7. Turn ignition on, with engine off. Using scan tool, reset adaptive fuel memory. Start engine and allow it to idle for at least 3 minutes. Ensure engine is at normal operating temperature. Using scan tool, read HO2S states. If 1/2 and 1/3 HO2S are switching states slower than 1/1 or 2/1 HO2S, test is complete. If HO2S switching is not as specified, perform NTC-13A: CHECKING ENGINE MECHANICAL SYSTEMS. WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See «FUEL PRESSURE RELEASE»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__fuel-pressure-release) .
8. Turn engine off. Release fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on, with engine off. Using scan tool, actuate fuel system test. Allow fuel pressure gauge to stabilize. Stop fuel system actuation test. Monitor fuel pressure gauge for one minute. If fuel pressure gauge reading drops more than 10 psi (.7 kg/cm 2 ), replace leaking fuel pump, fuel lines or injector(s) as necessary. Perform TEST VER-2A. If fuel pressure does not drop as specified, go to next step.
9. Inspect air cleaner and inlet ducts for restrictions. Repair air cleaner and inlet ducts as necessary. Perform TEST VER-2A. If no restrictions exist, perform «NTC-13A: CHECKING ENGINE MECHANICAL SYSTEMS»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__ntc-13a-checking-engine-mechanical-systems) .

NTC-11A: CHECKING HO2S HEATER

Note. 1/1 Heated Oxygen Sensor (HO2S) is located in upstream position. On models with 2 upstream HO2S, 1/1 HO2S is located in left upstream position. On AN body (2WD) with 5.9L engine and BE/BR bodies with 8.0L medium-duty engine, 1/2 Heated Oxygen Sensor (HO2S) is located in pre-catalyst position. On all other bodies, 1/2 HO2S is located in downstream position. On models equipped with 4 HO2S, 1/2 HO2S is located in left downstream position. 1/3 HO2S is used on BE/BR bodies with 8.0L medium-duty engine only and is located in post-catalyst position. 2/1 HO2S is located in right upstream position on models with 2 upstream HO2S.

1. Turn ignition on, with engine off. Using scan tool, actuate HO2S heater test. Wait 2 minutes for HO2S voltages to stabilize. Using scan tool, read HO2S signal voltage. If voltage is one volt or less on all HO2S, stop actuation test. Test is complete. If voltage is more than one volt on any HO2S, stop actuation test and go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
2. Turn ignition off. Disconnect suspected HO2S connector. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance between ground and HO2S connector, heater ground circuit. If resistance is less than one ohm, go to next step. If resistance is one ohm or more, repair open heater ground circuit. Perform TEST VER-2A. NOTE: Voltage remaining above one volt on any HO2S, indicates a problem with that HO2S. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
3. Turn ignition on, with engine off. Using scan tool, read HO2S signal voltage. If voltage is one volt or less on all HO2S, stop actuation test. Test is complete. If voltage is more than one volt on any HO2S, turn ignition off. Disconnect suspect HO2S connector. Clean and/or repair connector as necessary. Using a voltmeter, check voltage on HO2S connector, ASD relay output circuit. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-2A.
4. At this time, suspected HO2S is assumed to be defective. Replace HO2S. Perform TEST VER-2A.

NTC-12A: CHECKING IAC MOTOR

1. Start engine an allow it to reach normal operating temperature. Using scan tool, actuate IAC motor to 1400 RPM. If engine speed is 1300-1500 RPM, stop actuation. IAC motor is operating properly. If engine speed is not 1300-1500 RPM, go to next step.
2. Start engine and allow it to idle. Check engine, brake booster and vacuum hoses for leaks. Repair vacuum leaks as necessary. Perform TEST VER-2A. If no vacuum leaks exist, go to next step.
3. Turn ignition off. Disconnect IAC motor connector. IAC motor is located on throttle body. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector and terminals as necessary. Perform TEST VER-2A. If connector and terminals are okay, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
4. Ensure ignition is off. Ensure IAC motor connector is still disconnected. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and PCM connector, IAC driver No. 1 circuit. If resistance is less than 5 ohms, repair driver No. 1 circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
5. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, IAC driver No. 2 circuit. If resistance is less than 5 ohms, repair driver No. 2 circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
6. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, IAC driver No. 3 circuit. If resistance is less than 5 ohms, repair driver No. 3 circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step.
7. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, IAC driver No. 4 circuit. If resistance is less than 5 ohms, repair driver No. 4 circuit for short to ground. Perform TEST VER-2A. If resistance is 5 ohms or more, go to next step. NOTE: Voltage may switch or remain constant in this step.
8. Ensure ignition is off. Ensure IAC motor connector is still disconnected. Reconnect PCM connectors. Turn ignition on, with engine off. Using scan tool in actuator tests mode, actuate IAC stepper motor. Using a voltmeter, check voltage on IAC motor connector, driver No. 1 circuit. If voltage is more than 5 volts at any time, go to next step. If voltage is not 5 volts or more at any time, perform appropriate DTC P0505: IAC MOTOR CIRCUIT test. NOTE: Voltage may switch or remain constant in this step.
9. Ensure ignition is off. Ensure IAC motor connector is still disconnected. Ensure ignition is on, with engine off. Using scan tool in actuator tests mode, actuate IAC stepper motor. Using voltmeter, check voltage on IAC motor connector, driver No. 2 circuit. If voltage is more than 5 volts at any time, go to next step. If voltage is not 5 volts or more at any time, perform appropriate DTC P0505: IAC MOTOR CIRCUIT test. NOTE: Voltage may switch or remain constant in this step.
10. Ensure ignition is off. Ensure IAC motor connector is still disconnected. Ensure ignition is on, with engine off. Using scan tool in actuator tests mode, actuate IAC stepper motor. Using voltmeter, check voltage on IAC motor connector, driver No. 3 circuit. If voltage is more than 5 volts at any time, go to next step. If voltage is not 5 volts or more at any time, perform appropriate DTC P0505: IAC MOTOR CIRCUIT test. NOTE: Voltage may switch or remain constant in this step.
11. Ensure ignition is off. Ensure IAC motor connector is still disconnected. Ensure ignition is on, with engine off. Using scan tool in actuator tests mode, actuate IAC stepper motor. Using voltmeter, check voltage on IAC motor connector, driver No. 4 circuit. If voltage is more than 5 volts at any time, go to next step. If voltage is not 5 volts or more at any time, perform appropriate DTC P0505: IAC MOTOR CIRCUIT test.
12. Turn ignition off. Disconnect PCM connectors. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors and terminals as necessary. Perform TEST VER-2A. If connectors and terminals are okay, go to next step.
13. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using an ohmmeter, check resistance between IAC motor connector, driver No. 2 circuit, and driver No. 3 and driver No. 4 circuits. If resistance is 5 ohms or more between all circuits, go to next step. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together. Perform TEST VER-2A.
14. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAC motor connector, driver No. 1 circuit and each remaining driver circuit. If resistance is 5 ohms or more between all circuits, go to next step. If resistance is less than 5 ohms between any 2 circuits, repair driver circuits that are shorted together. Perform TEST VER-2A.
15. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAC motor connector, driver No. 3 circuit (Brown/White wire) and driver No. 4 circuit (Violet/Black wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair driver No. 3 circuit for short to driver No. 4 circuit. Perform TEST VER-2A.
16. At this time, IAC motor is assumed to be defective. Replace IAC motor. Perform TEST VER-2A.

NTC-13A: CHECKING ENGINE MECHANICAL SYSTEMS

Note. If coming to this test from a Heated Oxygen Sensor (HO2S) test, and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM). Perform TEST VER-2A.

1. At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes: Ensure engine vacuum is at least 13 in. Hg In Neutral: Check valve timing: Check engine compression: Check for exhaust system restrictions: Check PCV system for proper function: Ensure engine drive sprocket is properly positioned: Check torque converter stall speed (A/T): Check power brake booster for internal vacuum leak: Check for fuel contamination: Ensure injector control wire is connected to correct fuel injector and injector is not plugged or restricted: Check for pertinent Technical Service Bulletins (TSBs): If equipped with distributor, set distributor position. Go to next step. WARNING: Avoid contact with moving engine parts. NOTE: Setting distributor position does not adjust ignition timing. Ignition timing is controlled by PCM.
2. Connect scan tool to data link connector. Select SET SYNC from scan tool menu. Start engine and allow it to idle. Observe scan tool display. If scan tool does not display IN RANGE, loosen distributor hold-down clamp bolt and rotate distributor until reading is as close to zero degrees as possible, and IN RANGE message is displayed. Tighten hold-down clamp bolt to 16.7 ft. lbs. (22.5 N.m).

NTC-13B: CHECKING ENGINE MECHANICAL SYSTEMS

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes

1. Check fuel injection pump for malfunction, misadjustment or incorrect pump timing
2. Check for air in fuel system
3. Check for restricted or damaged injector nozzle
4. Check for improper fuel
5. Check for clogged fuel filter
6. Check for blocked or restricted fuel injection lines
7. Check for leaking or damaged fuel injection lines or loose connections
8. Check for empty fuel tank or blocked fuel tank vent
9. Check for clogged or restricted air filter
10. Check for blocked or leaking intercooler
11. Check for low or uneven engine compression
12. Check for misadjusted low idle
13. Check for throttle lever not reaching full throttle position.

NTC-14A: CHECKING BTS

Turn ignition on, engine off. Using scan tool, read and record Battery Temperature Sensor (BTS) value. Using a thermometer, read ambient temperature near battery. If BTS value is not within 10 degrees of thermometer reading, replace BTS. BTS is located under battery. Perform TEST VER-2A. If BTS value is within 10 degrees of thermometer reading, BTS is operating properly. Test passed.

NTC-15A: CHECKING BRAKE SWITCH

1. If vehicle is not equipped with Speed Control (S/C), go to step 5). If vehicle is equipped with S/C, go to next step. NOTE: For circuit identification and wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS article.
2. Turn ignition on, with engine off. Ensure brake pedal is not pressed. Using scan tool, actuate S/C solenoids. Using a 12-volt test light connected to ground, probe brake switch connector, s/C brake switch output circuit. Press brake pedal. If test light goes off when brake pedal is pressed and comes on when pedal is released, go to step 5). If test light does not go off when pedal is pressed and come on when pedal is released, go to next step.
3. Check brake switch adjustment. Adjust brake switch as necessary. Perform TEST VER-2A. If brake switch adjustment is okay, go to next step.
4. At this time, brake switch is assumed to be defective. Replace brake switch. Perform TEST VER-2A.
5. Using scan tool, read brake switch input while pressing and releasing brake pedal. If scan tool reading corresponds to position of brake pedal, brake switch is functioning properly. Test passed. If scan tool reading does not correspond to position of brake pedal (PRESSED or RELEASED) on TJ and XJ body, replace brake switch. Perform TEST VER-2A. On all other bodies, go to next step. NOTE: For circuit identification and wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS article.
6. Disconnect brake switch connector. Clean and/or repair connector as necessary. Perform TEST VER-2A. Using an ohmmeter, check resistance between ground and brakelight switch connector, ground circuit. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
7. Turn ignition off. Reconnect brake switch connector. Turn ignition on, with engine off. Ensure brake pedal is not pressed. Using a 12-volt test light connected to ground, backprobe brake switch connector, B+ circuit. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open B+ circuit. Perform TEST VER-2A.
8. Turn ignition off. Disconnect brake switch connector. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of brake switch sense circuit between brake switch connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open brake switch sense circuit. Perform TEST VER-2A.
9. Ensure ignition is off. Ensure brake switch connector is still disconnected. Reconnect PCM connector. Connect a jumper wire between ground and brakelight switch connector, brake switch sense circuit. Using scan tool, read brake switch status. If scan tool displays RELEASED, replace brake switch. Perform TEST VER-2A. If scan tool does not display RELEASED, go to next step.
10. Check brake switch adjustment. Adjust brake switch as necessary. Perform TEST VER-2A. If brake switch adjustment is okay, go to next step.
11. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A.

NTC-16A: CHECKING EVAP SYSTEM

1. Carefully inspect vacuum hoses for proper routing and pinched or plugged hoses from engine to EVAP purge solenoid and to fuel tank. EVAP purge solenoid is located on a bracket mounted in engine compartment. See EVAP PURGE LOCATION table. A vacuum hose routing schematic can be found on Vehicle Emission Control Information (VECI) label. VECI label is located in engine compartment, in front of radiator. Repair hoses as necessary. Perform TEST VER-6. If hoses are okay, go to next step. FUEL PRESSURE SPECIFICATIONS Application Location AB Body Left Front Inner Fender
2. Start engine and allow it to idle until engine coolant temperature is at least 170°F (76.7°C). Turn engine off. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose at EVAP purge solenoid. Start engine and allow it to idle. There should be no vacuum flow through EVAP purge solenoid for 1-2 minutes. If vacuum flow exists through EVAP purge solenoid within one minute, go to next step. If no vacuum flow exists through EVAP purge solenoid within one minute, go to step 6).
3. Turn engine off. Inspect vacuum hose and line from EVAP purge solenoid to EVAP canister for being disconnected, ripped or cut. If vacuum hose or line is disconnected, ripped or cut open, go to next step. If vacuum hose or line is not disconnected, ripped or cut open, ensure vacuum hose and line are clean and replace EVAP canister. Perform TEST VER-6.
4. Ensure ignition is off. Inspect vacuum hose and line from EVAP purge solenoid to EVAP canister for being disconnected, ripped or cut. If vacuum hose or line is disconnected, ripped or cut open, repair vacuum line or hose as necessary and replace EVAP purge solenoid. Perform TEST VER-6. If vacuum hose or line is not ripped or cut open, go to next step.
5. Ensure ignition is off. Remove EVAP purge solenoid. Tap EVAP purge solenoid ports against a clean, solid surface. If foreign material falls out of ports, replace EVAP purge solenoid. Perform TEST VER-6. If no foreign material falls out of ports, go to next step. CAUTION: DO NOT apply more than 5 psi (.35 kg/cm 2 ) air pressure on vacuum hose.
6. Turn engine off. Ensure EVAP purge solenoid-to-EVAP canister vacuum hose is still disconnected at EVAP purge solenoid. Attempt to blow air through EVAP solenoid-to-EVAP canister hose. If air flows, go to next step. If air does not flow, go to step 8).
7. Start engine and allow it to idle until engine coolant temperature is at least 170°F (76.7°C). Turn engine off. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose at EVAP purge solenoid. Start engine and allow it to idle. After 90 seconds, ensure vacuum flow cycles intermittently through EVAP purge solenoid. If vacuum flow cycles intermittently through EVAP purge solenoid after 90 seconds, test is complete. If vacuum flow does not cycle intermittently through EVAP purge solenoid after 90 seconds, replace EVAP purge solenoid. Perform TEST VER-6. CAUTION: DO NOT apply more than 5 psi (.35 kg/cm 2 ) air pressure on vacuum hose.
8. Ensure ignition is off. Disconnect EVAP purge solenoid-to-EVAP canister vacuum hose at EVAP canister. Attempt to blow air through EVAP solenoid-to-EVAP canister hose. If air flows, go to next step. If air does not flow, go to step replace EVAP canister. Perform TEST VER-6. If air does not flow, repair or replace vacuum line. Perform TEST VER-6.

NTC-17A: CHECKING IAT SENSOR

Note. When performing this test, DO NOT allow more than 5 minutes between measuring temperature of Intake Air Temperature (IAT) sensor with scan tool and measuring the air temperature inside of intake manifold with temperature probe.

Turn ignition on, engine off. Using scan tool, read and record IAT sensor value. Remove IAT sensor. Using a thermometer, read temperature inside IAT sensor opening. If IAT sensor value is within 10 degrees of thermometer reading, reinstall IAT sensor. IAT sensor is operating properly. Test is complete. If IAT sensor value is not within 10 degrees of thermometer reading, replace IAT sensor. Perform TEST VER-2A.

NTC-18A: CHECKING P/N SWITCH (A/T)

1. Apply parking brake. Turn ignition on, with engine off. Using scan tool, read Park/Neutral (P/N) position switch input state. Move gear selector in and out of Park and Drive while observing scan tool display. If display corresponds with gear selector position, system is functioning properly. Test is complete. If display does not correspond with gear selector position, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
2. Turn ignition off. Place gear selector in Park. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and P/N switch sense circuit. Move gear selector in and out of Park and Drive while observing scan tool display. If resistance stays less than 5 ohms at all times, go to next step. If resistance does not stay less than 5 ohms at all times, repair P/N switch sense circuit for short to ground. Perform TEST VER-2A.
3. Ensure ignition is off. Ensure PCM connectors are still disconnected. Disconnect P/N switch connector. P/N switch is located on side of transmission. Clean and/or repair connector as necessary. Using ohmmeter, check resistance of P/N switch sense circuit between P/N switch connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open P/N switch sense circuit. Perform TEST VER-2A.
4. Ensure ignition is off. Ensure PCM connectors are still disconnected. Reconnect P/N switch connector. Using an ohmmeter, check resistance between ground and P/N switch sense circuit. Move gear selector in and out of Park and Drive while observing scan tool display. If resistance switches from less than 5 ohms to more than 5 ohms, replace PCM. Perform TEST VER-2A. If resistance does not switch from less than 5 ohms to more than 5 ohms, go to next step.
5. At this time, P/N switch is assumed to be defective. Replace P/N switch. Perform TEST VER-2A.

NTC-19A: CHECKING OIL PRESSURE SENSOR

1. Turn ignition off. Check and correct oil level as necessary. While holding down TRIP ODOMETER button and observing oil pressure gauge, turn ignition on, with engine off. Instrument cluster self-test will now run for all gauges and lamps. If oil pressure gauge does not reach calibration points 0, 1/2 and FULL, replace oil pressure gauge. Perform TEST VER-2A. If oil pressure gauge reaches calibration points, go to next step.
2. Turn ignition off. Turn ignition on, with engine off. If oil pressure gauge reads FULL at all times with ignition on, go to next step. If oil pressure gauge does not read FULL at all times with ignition on, go to step 4). NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
3. Turn ignition off. Disconnect oil pressure sensor connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. If oil pressure gauge does not read FULL at all times with ignition on, replace oil pressure sensor. Perform TEST VER-2A. If oil pressure gauge reads FULL at all times with ignition on, repair short to ground in oil pressure sensor connector, signal circuit. Perform TEST VER-2A.
4. Turn ignition off. Disconnect oil pressure sensor connector. Clean and/or repair connector as necessary. Connect a jumper wire across oil pressure sensor connector. Turn ignition on, with engine off. If oil pressure gauge does not read FULL at all times with ignition on, go to step 7).
5. Turn ignition off. Remove oil pressure sensor. Install oil pressure gauge in oil pressure sensor opening. Start engine and allow it to idle. Record oil pressure. If oil pressure is 4 psi (.28 kg/cm 2 ) or more at idle, go to next step. If oil pressure is 4 psi (.28 kg/cm 2 ) or less with engine at idle, repair mechanical engine oil pressure problem as necessary. Perform TEST VER-2A.
6. Turn engine off. Ensure oil pressure sensor is still removed. Install oil pressure gauge in oil pressure sensor opening. Start engine and allow it to reach normal operating temperature. Read oil pressure. If oil pressure is not at least 4 psi (.28 kg/cm 2 ), repair mechanical engine oil pressure problem as necessary. Perform TEST VER-2A. If oil pressure is at least 4 psi (.28 kg/cm 2 ), replace oil pressure sensor. Perform TEST VER-2A. NOTE: For circuit identification and wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS article.
7. Using a 12-volt test light connected to battery voltage, probe oil pressure sensor connector, sensor ground circuit. If test light does not illuminate, go to next step. If test light illuminates, repair open oil pressure sensor signal circuit. Perform TEST VER-2A.
8. At this time, sensor ground circuit is assumed to be open. Repair open sensor ground circuit. Perform TEST VER-2A.

NTC-20A: CHECKING A/C SYSTEM

1. If DTC P0645: A/C CLUTCH RELAY CIRCUIT is present, perform appropriate DTC P0645: A/C CLUTCH RELAY CIRCUIT test. If DTC P0645: A/C CLUTCH RELAY CIRCUIT is not present, go to next step.
2. Turn ignition on, with engine off. Using scan tool, monitor A/C REQUEST state. Turn A/C switch on and A/C fan on high. If A/C REQUEST state does not change, go to step 10). If A/C REQUEST state changes, go to next step.
3. Ensure ignition is on, with engine off. Using scan tool, monitor A/C SELECT state. Turn A/C switch on and off several times. If A/C SELECT state does not change, repair open A/C select circuit. Perform TEST VER-2A. If A/C SELECT state changes, go to next step.
4. Ensure ignition is on, with engine off. Using scan tool, actuate A/C clutch relay. If A/C clutch actuates, A/C clutch is operating properly at this time. Test is complete. If A/C clutch does not actuate, go to next step.
5. Turn ignition off. Disconnect A/C clutch connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, actuate A/C clutch relay. Connect a 12-volt test light across A/C clutch connector terminals. If test light blinks, replace A/C clutch coil. Perform TEST VER-2A. If test light does not blink, go to next step. NOTE: For circuit identification and wiring diagram, see appropriate wiring diagram in WIRING DIAGRAMS article.
6. Turn ignition off. Remove A/C clutch relay. A/C clutch relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Disconnect A/C clutch connector. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance of A/C clutch relay output circuit from A/C clutch relay connector to A/C clutch coil. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open A/C clutch relay output circuit. Perform TEST VER-2A.
7. Ensure ignition is off. Ensure A/C clutch relay is still removed. Reconnect A/C clutch connector. Using a 12-volt test light connected to ground, probe A/C clutch relay connector, fused B+ circuit. If test light does not illuminate brightly, repair open fused B+ circuit. Perform TEST VER-2A. If test light illuminates brightly, go to next step.
8. Ensure ignition is off. Disconnect A/C clutch connector. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance between ground and A/C clutch connector, ground circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-2A.
9. At this time, A/C clutch relay is assumed to be defective. Replace A/C clutch relay. Perform TEST VER-2A.
10. Turn ignition off. Ensure A/C system is properly charged. Recharge system as necessary. Perform TEST VER-2A. If A/C system is properly charged, go to next step
11. Check high pressure cut-off switch. See «HIGH PRESSURE CUT-OUT SWITCH»(/dodge/ram-van-b3500/1999-1999/remont/manual-hvac-system/#ac-heater-system) in MANUAL A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. Replace high pressure cut-off switch as necessary Perform TEST VER-2A. If high pressure cutoff switch is okay, go to next step.
12. Check fin sensing cycling clutch switch operation. See «FIN SENSOR CYCLING CLUTCH SWITCH»(/dodge/ram-van-b3500/1999-1999/remont/manual-hvac-system/#ac-heater-system) in A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. Replace fin sensing cycling clutch switch as necessary. Perform TEST VER-2A. If fin sensing cycling clutch switch is okay, go to next step.
13. Check low pressure cut-off switch. See «LOW PRESSURE CUT-OUT SWITCH»(/dodge/ram-van-b3500/1999-1999/remont/manual-hvac-system/#ac-heater-system) in A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING. Replace low pressure cut-off switch as necessary. Perform TEST VER-2A. If low pressure cutoff switch is okay, go to next step.
14. At this time, A/C clutch relay is assumed to be defective. Replace A/C clutch relay. Perform TEST VER-2A.

NTC-21A: CHECKING RADIATOR FAN OPERATION

1. Turn ignition on, with engine off. Using scan tool, actuate radiator fan relay. If radiator fan comes on and off, radiator fan SYSTEM is operating properly. Test is complete. Perform TEST VER-2A. If radiator fan does not come on and off, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
2. Ensure ignition is on, with engine off. Using a 12-volt test light connected to ground, backprobe radiator fan motor connector, control output circuit. If test light blinks, go to next step. If test light does not blink, go to step 5).
3. Turn ignition off. Disconnect radiator fan motor connector. Clean and/or repair connector and terminals as necessary. Using an ohmmeter, check resistance between ground and radiator fan motor connector, ground circuit. If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-2A. If resistance is less than 5 ohms, go to next step.
4. At this time, radiator fan motor is assumed to be defective. Replace radiator fan motor. Perform TEST VER-2A.
5. Turn ignition off. Remove radiator fan relay. Radiator fan relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Using a 12-volt test light connected to ground, probe radiator fan relay connector, fused B+ circuit. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, check radiator fan fuse in PDC and repair open B+ circuit. Perform TEST VER-2A.
6. Ensure ignition is off. Ensure radiator fan relay is still remove. Disconnect radiator fan motor connector. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of output circuit between radiator fan relay and radiator fan motor. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open output circuit. Perform TEST VER-2A.
7. At this time, radiator fan relay is assumed to be defective. Replace radiator fan relay. Perform TEST VER-2A.

NTC-22A: CHECKING CHARGING SYSTEM

1. Ensure battery is in good condition and fully charged before proceeding with test procedure. Inspect generator belt for damage and proper adjustment. If generator belt is in good condition and properly adjusted, go to next step. If generator belt is not in good condition or not properly adjusted, repair as necessary. Perform TEST VER-3A.
2. Start engine and allow it to idle. Using scan tool, set engine speed to 2000 RPM for 30 seconds, and then return engine to idle. Using scan tool, check for DTCs. If any charging system DTCs exist, perform appropriate test for specified DTC(s) proceed to appropriate DTC test. See . If no charging system DTCs exist, go to next step.
3. Turn engine off. Turn ignition on, with engine off. Using scan tool, read and record battery voltage. Using voltmeter, check and record voltage between positive and negative battery terminals. Compare 2 voltage readings. If difference between voltage readings is one volt or more, go to next step. If difference between voltage readings is less than on volt, test is complete. Perform TEST VER-3A. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
4. Ensure ignition is on, with engine off. Using scan tool, actuate Generator (GEN) field driver. Using a 12-volt test light connected to ground, probe GEN field driver circuit at back of generator. Test light should cycle on and off every 1.4 seconds. While monitoring test light, wiggle wiring harness and connectors from generator to the PCM. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If no interruption of the voltage cycle exists while wiggling wiring harness and connectors, go to next step. If interruption of the voltage cycle exists while wiggling wiring harness and connectors, repair wiring or connector where wiggling caused interruption of voltage cycle. Perform TEST VER-3A. CAUTION: Ensure all wires are clear of engine's moving parts.
5. Ensure ignition is on with engine off. Stop GEN field driver actuation. Start engine and allow it to idle. Using a voltmeter, check voltage between battery positive and generator B+ terminals. f voltage is more than .4 volt, repair B+ circuit for high resistance between generator and battery. Perform TEST VER-3A. If voltage is .4 volt or less, go to next step.
6. Turn engine off. Turn ignition on, with engine off. Using scan tool, check for DTCs. If any charging system DTCs exist, perform appropriate test for specified DTC(s) proceed to appropriate DTC test. See . If no charging system DTCs exist, go to next step.
7. Turn ignition off. Using a voltmeter, check voltage between battery negative terminal and generator case. If voltage is more than .1 volt, repair generator ground circuit for high resistance between generator case and battery. Perform TEST VER-3A. If voltage is .1 volt or less, go to next step.
8. Turn ignition on, with engine off. Using scan tool, read and record battery voltage. Turn ignition off. Disconnect PCM connectors. Clean and/or repair connectors as necessary. Turn ignition on, with engine off. Using voltmeter, check and record voltage at PCM connector B+ circuit. Compare 2 voltage readings. If difference between voltage readings is within one volt, go to next step. If difference between voltage readings is not within on volt, repair B+ circuit for high resistance between PCM and battery. Perform TEST VER-3A.
9. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.

TEST NS-SEL: NO START SELECTION MENU

1. If PCM has not been replaced, go to next step. If PCM has been replaced, correct VIN and mileage must be reprogrammed. Using scan tool, enter correct VIN and mileage into PCM. Erase codes in ABS and air bag modules. Go to next step.
2. If vehicle is not equipped with Smart Key Immobilizer Module (SKIM), go to step 4). If vehicle is equipped with SKIM, secret key data must be updated to enable starting. Go to next step.
3. Using scan tool, select ENGINE MISC and then SKIM. Select SECURED ACCESS MODE and enter appropriate PIN code for this vehicle. Select UPDATE SECRET CODE data. Data will be transferred from SKIM to PCM. Go to next step.
4. Ensure battery is fully charged. Attempt to crank engine. If engine will not crank, perform TEST NS-9A: REPAIRING NO CRANK CONDITION. If engine cranks, but does not start and scan tool displays NO RESPONSE, perform «TEST NS-6B: REPAIRING NO RESPONSE CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-6b-repairing-no-response-condition) . If engine starts and scan tool displays NO RESPONSE, perform «TEST NS-6C: REPAIRING NO RESPONSE CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-6c-repairing-no-response-condition) . If engine starts and scan tool does not display NO RESPONSE, go to next step.
5. Turn ignition off. Turn ignition on, but do not crank engine. Using scan tool, read DTCs. If any DTCs are displayed, perform appropriate test for specified DTC(s) proceed to appropriate DTC test. See DTC MESSAGES & CODES table. If no DTCs are displayed, refer to one of the following: For gasoline engines with no start problem, perform TEST NS-1A: QUALIFYING NO START CONDITION

TEST NS-1A: QUALIFYING NO START CONDITION

Note. When checking for spark, consider 1-2 sparks as a no-spark condition.

1. Turn ignition off. Disconnect spark plug cable at spark plug No. 1. Connect cable terminal to a spark tester. Connect spark tester to engine ground. While cranking engine for 10 seconds, observe for spark. If a good spark occurs, go to next step. If a good spark does not occur, reconnect spark plug cable and go to step 4).
2. If engine starts and stalls, perform «TEST NS-8A: REPAIRING START & STALL CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-8a-repairing-start-stall) . If engine does not start and stall, go to next step.
3. Using scan tool, read SECONDARY INDICATORS while cranking engine. If any DTCs are displayed, perform appropriate test for specified DTC(s) proceed to appropriate DTC test. See DTC MESSAGES & CODES table. If no DTCs are displayed, perform TEST NS-2A: CHECKING FUEL SYSTEM.
4. Check valve timing. Correct valve timing as necessary. Perform TEST VER-1A. If valve timing is okay, go to next step.
5. Ensure ignition is off. Using scan tool, actuate Generator (GEN) field. Using a 12-volt test light, probe ignition coil connector, ASD relay output circuit. If test light does not illuminate brightly, repair ASD relay output circuit as necessary. Perform TEST VER-1A. If test light illuminates brightly, go to next step.
6. Ensure ignition is off. Remove ignition coil secondary cable. Using an external ohmmeter, check resistance between both ends of ignition coil secondary cable. If resistance is more than 15,000 ohms, replace ignition coil secondary cable. Perform TEST VER-1A. If resistance is 15,000 ohms or less, go to next step.
7. Ensure ignition is off. Remove distributor cap and observe distributor rotor while cranking engine. If rotor does not turn, repair distributor drive system as necessary. Perform TEST VER-1A. If rotor turns, go to next step.
8. Turn ignition off. Reinstall distributor cap and ignition coil secondary cable. Disconnect ignition coil connector. Visually inspect connector for corroded, damaged, pushed-out or miswired terminals. Repair connector and terminals as necessary. Perform TEST VER-1A. If connector and terminals are okay, go to next step.
9. Ensure ignition is off. Remove coil secondary cable from distributor. Connect cable terminal to a spark tester. Connect spark tester to engine ground. While cranking engine for 10 seconds, observe for spark. If a good spark does not occur, go to step 12). If a good spark occurs, repair or replace distributor cap, rotor and/or spark plug cables as necessary. Perform TEST VER-1A.
10. Turn ignition off. Ensure ignition coil connector is still disconnected. Turn ignition on, with engine off. Using scan tool, actuate ignition coil. Using a voltmeter, check voltage on ignition coil connector, ASD relay output circuit. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ASD relay output circuit. Perform TEST VER-1A.
11. Turn ignition off. Ensure ignition coil connector is still disconnected. Disconnect PCM Black connector. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance between ground and PCM connector, ignition coil driver circuit. If resistance is less than 5 ohms, repair short to ground in ignition coil driver circuit. Perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
12. Ensure ignition is off. Ensure ignition coil connector is still disconnected. Using ohmmeter, check resistance across ignition coil primary terminals. If resistance is 0.95-1.20 ohms on TJ and XJ bodies, or 0.60-1.40 ohms on all other bodies, go to next step. If resistance is not as specified, replace ignition coil. Perform TEST VER-1A.
13. Ensure ignition is off. Ensure ignition coil connector is still disconnected. Ensure coil secondary cable is still removed. Using ohmmeter, check resistance across ignition coil primary and secondary terminals. If resistance is not 11,300-15,300 ohms, replace ignition coil. Perform TEST VER-1A. If resistance is as specified, go to next step.
14. Ensure ignition is off. Ensure ignition coil and PCM Black connectors are still disconnected. Using ohmmeter, check resistance of ignition coil driver circuit between ignition coil connector and PCM. If resistance is more than 5 ohms, repair open ignition coil driver circuit. Perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
15. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.

TEST NS-2A: CHECKING FUEL SYSTEM

1. Turn ignition on, with engine off. Using scan tool, actuate ASD fuel system test. Using a mechanic's stethoscope, listen for fuel pump operation at fuel tank. If fuel pump operation can be heard, stop ASD fuel system test and go to next step. If fuel pump operation cannot be heard, stop ASD fuel system test. Perform «TEST NS-5A: CHECKING FUEL PUMP»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-5a-checking-fuel-pump) .
2. On all bodies except AB body, go to next step. On AB body, ensure ignition is on, with engine off. Using scan tool in inputs/outputs mode, read VEH THEFT SECURITY status. If scan tool displays FUEL ON, go to next step. If scan tool does not display FUEL ON, see «VEHICLE THEFT/SECURITY SYSTEM»(/dodge/ram-van-b3500/1999-1999/remont/body-cab-control-systems/#body-control-computer) in BODY CONTROL COMPUTER TESTS - RAM VAN & RAM WAGON article in ACCESSORIES & EQUIPMENT.
3. Ensure throttle cable is not holding throttle open. Repair throttle cable as necessary. Perform TEST VER-1A. If throttle cable is okay, go to next step. WARNING: High fuel pressure may be present in fuel lines. Open fuel system with caution. See FUEL PRESSURE RELEASE.
4. Turn engine off. Release fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on, with engine off. Using scan tool, actuate ASD fuel system test. Allow fuel pressure gauge to stabilize. Stop ASD fuel system test. If fuel pressure is more than 54.2 psi (3.96 kg/cm 2 ), replace fuel filter/pressure regulator. Perform TEST VER-1A. If fuel pressure is 54.2 psi (3.96 kg/cm 2 ) or less, go to next step.
5. Turn ignition off. If fuel pressure is less than 44.2 psi (3.23 kg/cm 2 ), perform TEST NS-4A: REPAIRING LOW FUEL PRESSURE. If fuel pressure is 44.2 psi (3.23 kg/cm 2 ) or more, go to next step.
6. Ensure ignition is off. Attempt to start engine. If engine starts and stalls, perform «TEST NS-8A: REPAIRING START & STALL CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-8a-repairing-start-stall) . If engine does not start and stall, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
7. Turn ignition on, with engine off. Using scan tool, actuate any fuel injector. Listen for fuel injector operation. If fuel injector is operating, perform TEST NS-3A: CHECKING ENGINE MECHANICAL SYSTEM. If fuel injector is not operating, repair open ASD output circuit to fuel injectors. Perform TEST VER-1A.

TEST NS-3A: CHECKING ENGINE MECHANICAL SYSTEM

1. Turn ignition off. Inspect spark plug cables for correct placement. Reposition cables as necessary. See appropriate illustration under «FIRING ORDER & TIMING MARKS»(/dodge/ram-van-b3500/1999-1999/remont/specifications/#engine-controls-service-adjustment-specifications) in SERVICE & ADJUSTMENT SPECIFICATIONS - TRUCKS article. Perform TEST VER-1A. If spark plug cables are installed correctly, go to next step.
2. Ensure ignition is off. Check valve timing. Correct valve timing as necessary. Perform TEST VER-1A. If valve timing is okay, go to next step.
3. Ensure ignition is off. Start engine and allow it to idle. Check exhaust system for restrictions. Repair exhaust system as necessary. Perform TEST VER-1A. If exhaust system is okay, go to next step.
4. Remove ASD relay. ASD relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Remove spark plugs. Check engine compression. For compression specifications, see «ENGINE COMPRESSION»(/dodge/ram-van-b3500/1999-1999/remont/specifications/#engine-controls-service-adjustment-specifications__engine-compression) in SERVICE & ADJUSTMENT SPECIFICATIONS - TRUCKS article. Repair engine mechanical condition as necessary. Perform TEST VER-1A. If compression is okay, go to next step.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.

TEST NS-4A: REPAIRING LOW FUEL PRESSURE

1. Turn ignition off. Inspect fuel lines from fuel filter/pressure regulator to fuel rail for restrictions. Repair restricted fuel lines as necessary. Perform TEST VER-1A. If fuel lines are okay, go to next step.
2. At this time, fuel pump module is assumed to be defective. Replace fuel pump module. Fuel pump module is located in fuel tank. Perform TEST VER-1A.

TEST NS-5A: CHECKING FUEL PUMP

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

1. Ensure ignition is off. Remove fuel pump relay. Fuel pump relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Substitute a known-good fuel pump relay and attempt to start engine. If engine starts, replace original fuel pump relay. Perform TEST VER-1A. If engine does not start, go to next step.
2. Ensure ignition is off. Ensure fuel pump relay is still removed. Turn ignition on, with engine off. Using a voltmeter, check voltage on fuel pump relay connector, fused B+ circuit. If voltage is 10 volts or less, repair open fused B+ circuit. Perform TEST VER-1A. If voltage is more than 10 volts, reinstall original relay and go to next step.
3. Turn ignition off. Disconnect fuel pump connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, actuate fuel system. On AB body, go to next step. On all other bodies, use an external voltmeter to check voltage on fuel pump relay output circuit between fuel pump relay and PCM. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. If voltage is 10 volts or less, repair open fuel pump relay output circuit. Perform TEST VER-1A. If voltage is more than 10 volts, go to step 8).
4. Ensure ignition is on, with engine off. Using a 12-volt test light connected to ground, probe fuel pump connector, fuel pump relay output circuit. If test light does not illuminate brightly, repair open fuel pump relay output circuit. Perform TEST VER-1A. Of test light illuminates brightly, go to next step.
5. Turn ignition off. Ensure fuel pump connector is still disconnected. Using scan tool, stop fuel system actuation. Using an ohmmeter, check resistance between ground and fuel pump connector, fuel pump ground circuit. If resistance is 5 ohms or more, repair open fuel pump ground circuit. Perform TEST VER-1A. If resistance is less than 5 ohms, go to next step. WARNING: Fuel system may be under pressure. Release fuel pressure before opening system for testing or component replacement. See FUEL PRESSURE RELEASE.
6. Ensure ignition is off. Ensure fuel pump connector is still disconnected. Visually inspect fuel pump connector and wiring harness for damage. Repair fuel pump connector and wiring harness as necessary. Perform TEST VER-1A. If fuel pump connector and wiring harness are okay, go to next step.
7. At this time, fuel pump is assumed to be defective. Replace fuel pump module. Perform TEST VER-1A.

TEST NS-6B: REPAIRING NO RESPONSE CONDITION

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) Black connector. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Turn ignition on. Using a 12-volt test light connected to ground, probe PCM Black connector, fused ignition switch output circuit. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair fused ignition switch output circuit for open or high resistance. Perform TEST VER-1A.
2. Turn ignition off. Ensure PCM Black connector is still disconnected. Using 12-volt test light connected to battery voltage, probe both PCM Black connector, ground circuits. If test light illuminates brightly on both circuits, go to next step. If test light does not illuminate brightly on both circuits, repair ground circuit(s) for open or high resistance. Perform TEST VER-1A.
3. Ensure ignition is off. Ensure PCM Black connector is still disconnected. Using 12-volt test light connected to ground, probe PCM Black connector, B+ circuit. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, go to step 16).
4. Ensure ignition is off. Ensure scan tool is still connected to Data Link Connector (DLC). Disconnect transmission solenoid connector (if equipped). Clean and/or repair connector as necessary. Turn ignition on, with engine off. If scan tool responds, replace transmission governor/temperature pressure sensor. Perform TEST VER-1A. If scan tool does not respond, go to next step.
5. Turn ignition off. Ensure scan tool is still connected to DLC. Disconnect PCM White connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. If scan tool responds, repair PCM White connector, 5-volt secondary circuit for short to ground. Perform TEST VER-1A. If scan tool does not respond, go to next step.
6. Ensure ignition is off. Using a voltmeter, backprobe Throttle Position (TP) sensor connector, 5-volt supply circuit. TP sensor is located on throttle body. Turn ignition on, with engine off. If voltage is less than 4 volts, go to next step. If voltage is 4 volts or more, go to step 14).
7. Turn ignition off. Disconnect TP sensor connector. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using voltmeter, check voltage on TP sensor connector, 5-volt supply circuit. If voltage is less than 4 volts, replace TP sensor. Perform TEST VER-1A. If voltage is 4 volts or more, go to next step.
8. Turn ignition off. Ensure TP sensor connector is still disconnected. Turn ignition on, with engine off. Connect voltmeter between ground and TP sensor connector, 5-volt supply circuit. Disconnect Crankshaft Position (CKP) sensor connector. Clean and/or repair connector as necessary. Read voltmeter. If voltage is less than 4 volts, go to next step. If voltage is 4 volts or more, replace CKP sensor. Perform TEST VER-1A.
9. Turn ignition off. Ensure TP sensor connector is still disconnected. Turn ignition on, with engine off. Connect voltmeter between ground and TP sensor connector, 5-volt supply circuit. Disconnect Camshaft Position (CMP) sensor connector. Clean and/or repair connector as necessary. Read voltmeter. If voltage is less than 4 volts, go to next step. If voltage is 4 volts or more, replace CMP sensor. Perform TEST VER-1A.
10. Turn ignition off. Ensure TP sensor connector is still disconnected. Turn ignition on, with engine off. Connect voltmeter between ground and TP sensor connector, 5-volt supply circuit. Disconnect MAP sensor connector. Clean and/or repair connector as necessary. Read voltmeter. If voltage is less than 4 volts, go to next step. If voltage is 4 volts or more, replace MAP sensor. Perform TEST VER-1A.
11. Turn ignition off. Ensure TP sensor connector is still disconnected. Turn ignition on, with engine off. Using voltmeter, check voltage on TP sensor connector, sensor ground circuit. If voltage is more than one volt, repair sensor ground circuit for short to voltage. Perform TEST VER-1A. If voltage is one volt or less, go to next step.
12. Turn ignition off. Disconnect PCM connectors. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and PCM connector, 5-volt primary supply circuit. If resistance is less than 5 ohms, repair 5-volt primary supply circuit for short to ground. Perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
13. Ensure ignition is off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, 5-volt secondary supply circuit. If resistance is less than 5 ohms, repair 5-volt secondary supply circuit for short to ground. Perform TEST VER-1A. If resistance is 5 ohms or more, perform TEST NS-6C: REPAIRING NO RESPONSE CONDITION.
14. Ensure ignition is off. Disconnect TP sensor connector. Clean and/or repair connector as necessary. Using voltmeter, check voltage on TP sensor connector, 5-volt supply circuit. Turn ignition on, with engine off. If voltage is more than 5.5 volts, repair 5-volt supply circuit for short to voltage. Perform TEST VER-1A. If voltage is 5.5 volts or less, go to next step.
15. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.
16. Ensure ignition is off. Remove and inspect fuse in Power Distribution Center (PDC) that supplies fused B+ voltage to PCM connector C1, terminal No. A22. PDC is located next to battery. If fuse is defective, go to next step. If fuse is okay, go to step 19).
17. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal No. A22 is still removed. Using a test light connected to ground, probe B+ side of fuse connector. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open fused B+ circuit from fuse to battery. Perform TEST VER-1A. If voltage is 10 volts or less, repair B+ circuit from fuse to battery. Perform TEST VER-1A.
18. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal No. A22 is still removed. Using a test light connected to ground, probe B+ side of fuse connector. If test light illuminates brightly, repair fused B+ circuit from fuse to PCM as necessary. Perform TEST VER-1A. If test light does not illuminate brightly, test is complete.
19. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal A22 is still removed. Remove ASD relay from PDC. Refer to label under PDC cover for relay location. Disconnect Heated Oxygen Sensor (HO2S) connectors. Disconnect ignition coil connector. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and ASD relay connector, output circuit. Monitor resistance while disconnecting each fuel injector connector. If resistance goes to more than 5 ohms when disconnecting fuel injectors, go to next step. If resistance does not go to more than 5 ohms when disconnecting fuel injectors, repair ASD relay output circuit for short to ground, and replace fuse. Perform TEST VER-1A.
20. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal A22 and ASD relay are still removed. Ensure HO2S and ignition coil connectors are still disconnected. Using ohmmeter, check resistance between ground and ASD relay connector, output circuit. If resistance is more than 5 ohms, replace ignition coil, and replace fuse. Perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
21. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal A22 and ASD relay are still removed. Ensure HO2S and ignition coil connectors are still disconnected. Using ohmmeter, check resistance between ground and ASD relay connector, output circuit. Monitor resistance while disconnecting each fuel injector connector. If resistance goes to more than 5 ohms when disconnecting fuel injectors, replace fuel injector(s) that caused change in resistance, and replace fuse. Perform TEST VER-1A. If resistance does not go to more than 5 ohms when disconnecting fuel injectors, go to next step.
22. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal No. A22 and ASD relay are still removed. Ensure HO2S connectors are still disconnected. Remove TRANS relay from PDC (if equipped). Refer to label under PDC cover for relay location. Disconnect PCM Black connector. Clean and/or repair connector as necessary. Using ohmmeter, check resistance between ground and PCM Black connector, fused B+ circuit. If resistance is more than 5 ohms, repair fused B+ circuit for short to ground, and replace fuse. Perform TEST VER-1A. If resistance is 5 ohms or less, go to next step. NOTE: An intermittent ASD relay output circuit short to ground may exist.
23. Ensure ignition is off. Ensure fuse in PDC that supplies fused B+ voltage to PCM connector C1, terminal No. A22 and ASD relay are still removed. Ensure HO2S connectors are still disconnected. Using ohmmeter, check resistance between ground and each HO2S connector, ASD relay output circuit. If resistance is more than 5 ohms on any ASD relay output circuit, repair ASD relay output circuit(s) or replace defective HO2S, and replace fuse. Perform TEST VER-1A. If resistance is 5 ohms or less on all ASD relay output circuits, test is complete.

TEST NS-6C: REPAIRING NO RESPONSE CONDITION

1. If ignition is not on when NO RESPONSE message is displayed, turn ignition on to get a response. Test is complete. If ignition is on when NO RESPONSE message is displayed, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
2. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Disconnect scan tool from Data Link Connector (DLC). Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of SCI receive circuit between DLC connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open SCI receive circuit. Perform TEST VER-1A.
3. Ensure ignition is off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, SCI receive circuit. If resistance is less than 5 ohms, repair SCI receive circuit for short to ground. Perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
4. Ensure ignition is off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance of SCI transmit circuit between DLC connector and PCM. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open SCI transmit circuit. Perform TEST VER-1A.
5. Ensure ignition is off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, SCI transmit circuit. If resistance is less than 5 ohms, repair SCI transmit circuit for short to ground. Perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
6. Ensure ignition is off. Connect scan tool to functional DLC on another vehicle. Turn ignition on. Using scan tool, attempt to read DTCs. If scan tool does not display NO RESPONSE, replace initial vehicle's PCM. Perform TEST VER-1A. If scan tool displays NO RESPONSE, go to next step.
7. Ensure ignition is off. Substitute another scan tool adapter cable. Using scan tool, attempt to read DTCs. If scan tool does not display NO RESPONSE, replace original scan tool adapter cable. If scan tool displays NO RESPONSE, go next step.
8. At this time, scan tool is assumed to be defective. Replace scan tool. Perform TEST VER-1A.

TEST NS-7A: CHECKING IDLE AIR CONTROL MOTOR

1. Holding throttle 1/4 way down, attempt to start engine. If engine does not start and stay running, and then stall when throttle is released, perform TEST NS-8A: REPAIRING START & STALL CONDITION. If engine starts and stays running, and then stalls when throttle is released, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
2. Turn ignition off. Disconnect IAC motor connector. IAC motor is located on throttle body. Clean and/or repair connector as necessary. Turn ignition on, with engine off. Using scan tool, actuate IAC motor. Using a voltmeter, check voltage on IAC motor connector, No. 3 driver circuit. If voltage stays less than one volt, go to next step. If voltage does not stay less than one volt, go to step 6).
3. Turn ignition off. Ensure IAC motor connector is still disconnected. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of IAC motor connector, No. 3 driver circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open No. 3 driver circuit. Perform TEST VER-1A.
4. Ensure ignition is off. Ensure PCM connectors are still disconnected. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors and terminals as necessary. Perform TEST VER-1A. If connectors and terminals are okay, go to next step.
5. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.
6. Turn ignition off. Ensure IAC motor connector is still disconnected. Turn ignition on, with engine off. Using scan tool, actuate IAC motor. Using a voltmeter, check voltage on IAC motor connector, No. 1 driver circuit. If voltage stays less than one volt, go to next step. If voltage does not stay less than one volt, go to step 10).
7. Turn ignition off. Ensure IAC motor connector is still disconnected. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of IAC motor connector, No. 1 driver circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open No. 1 driver circuit. Perform TEST VER-1A.
8. Ensure ignition is off. Ensure PCM connectors are still disconnected. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors and terminals as necessary. Perform TEST VER-1A. If connectors and terminals are okay, go to next step.
9. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.
10. Turn ignition off. Ensure IAC motor connector is still disconnected. Turn ignition on, with engine off. Using scan tool, actuate IAC motor. Using a voltmeter, check voltage on IAC motor connector, No. 4 driver circuit. If voltage stays less than one volt, go to next step. If voltage does not stay less than one volt, go to step 14).
11. Turn ignition off. Ensure IAC motor connector is still disconnected. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of IAC motor connector, No. 4 driver circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open No. 4 driver circuit. Perform TEST VER-1A.
12. Ensure ignition is off. Ensure PCM connectors are still disconnected. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors and terminals as necessary. Perform TEST VER-1A. If connectors and terminals are okay, go to next step.
13. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.
14. Turn ignition off. Ensure IAC motor connector is still disconnected. Turn ignition on, with engine off. Using scan tool, actuate IAC motor. Using a voltmeter, check voltage on IAC motor connector, No. 2 driver circuit. If voltage stays less than one volt, go to next step. If voltage does not stay less than one volt, go to step 18).
15. Turn ignition off. Ensure IAC motor connector is still disconnected. Disconnect Powertrain Control Module (PCM) connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of IAC motor connector, No. 2 driver circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open No. 2 driver circuit. Perform TEST VER-1A.
16. Ensure ignition is off. Ensure PCM connectors are still disconnected. Visually inspect connectors for corroded, damaged, pushed-out or miswired terminals. Repair connectors and terminals as necessary. Perform TEST VER-1A. If connectors and terminals are okay, go to next step.
17. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-1A.
18. Turn ignition off. Remove IAC motor from throttle body. Reconnect IAC motor and PCM connectors. Turn ignition on, with engine off. Using scan tool, actuate IAC motor. If IAC motor tip does not move in and out, go to step 20). If IAC motor tip moves in and out, go to next step.
19. Turn ignition off. Inspect throttle body for restriction or carbon build-up. Repair throttle body as necessary. Perform TEST VER-1A. If throttle body is okay, perform TEST NS-8A: REPAIRING START & STALL CONDITION.
20. Ensure ignition is off. Disconnect IAC motor and PCM connectors. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between IAC motor connector, No. 3 and No. 4 driver circuits. If resistance is less than 5 ohms, repair No. 3 driver circuit for short to No. 4 driver circuit. Perform TEST VER-1A. If resistance is 5 ohms or more, go to next step.
21. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAC motor connector, No. 1 driver circuit and each remaining driver circuit on IAC motor connector. If resistance is less than 5 ohms between any 2 driver circuits, repair driver circuits that are shorted together. Perform TEST VER-1A. If resistance is 5 ohms or more between all driver circuits, go to next step.
22. Ensure ignition is off. Ensure IAC motor and PCM connectors are still disconnected. Using ohmmeter, check resistance between IAC motor connector, No. 2 driver circuit, and No. 3 and No. 4 driver circuits. If resistance is less than 5 ohms between any 2 driver circuits, repair driver circuits that are shorted together. Perform TEST VER-1A. If resistance is 5 ohms or more between all driver circuits, go to next step.
23. At this time, IAC motor is assumed to be defective. Replace IAC motor. Perform TEST VER-1A.

TEST NS-8A: REPAIRING START & STALL CONDITION

1. If PCM has not been replaced, go to next step. If PCM has been replaced, correct VIN and mileage must be reprogrammed. Using scan tool, enter correct VIN and mileage into PCM. Erase codes in ABS and air bag modules. Go to next step.
2. If vehicle is not equipped with Smart Key Immobilizer Module (SKIM), go to next step. If vehicle is equipped with SKIM, secret key data must be updated to enable starting. Using scan tool, select ENGINE MISC and then SKIM. Select SECURED ACCESS MODE and enter appropriate PIN code for this vehicle. Select UPDATE SECRET CODE data. Data will be transferred from SKIM to PCM. Go to next step.
3. At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a driveability problem. Following additional items should be checked as possible causes: Ensure engine vacuum is at least 13 in. Hg In Neutral Check valve timing: Check engine compression: Check for exhaust system restrictions: Check PCV system for proper function: Ensure engine drive sprocket is properly positioned: Check torque converter stall speed (A/T): Check power brake booster for internal vacuum leak: Check for fuel contamination: Ensure injector control wire is connected to correct fuel injector and injector is not plugged or restricted: Check for pertinent Technical Service Bulletins (TSBs): If equipped with distributor, set distributor position. Go to next step. WARNING: Avoid contact with moving engine parts. NOTE: Setting distributor position does not adjust ignition timing. Ignition timing is controlled by PCM.
4. Connect scan tool to data link connector. Select SET SYNC from scan tool menu. Start engine and allow it to idle. Observe scan tool display. If scan tool does not display IN RANGE, loosen distributor hold-down clamp bolt and rotate distributor until reading is as close to zero degrees as possible, and IN RANGE message is displayed. Tighten hold-down clamp bolt to 16.7 ft. lbs. (22.5 N.m).

TEST NS-9A: REPAIRING NO CRANK CONDITION (A/T)

Note. If vehicle is equipped with Manual Transmission (M/T), perform TEST NS-10A: REPAIRING NO CRANK CONDITION. Vehicles equipped with Automatic Transmission (A/T) may use a Park/Neutral (P/N) position switch or a transmission range sensor. For purposes of this test, transmission range sensor will be referred to as P/N position switch.

1. Turn ignition on, with engine off. Ensure gear selector is in Park or Neutral position. Using scan tool, select INPUTS/OUTPUTS and read P/N state. If scan tool does not display P/N, repair P/N switch or transmission range sensor as necessary. Perform TEST VER-1A. If scan tool displays P/N, go to next step. NOTE: For connector terminal identification, see «CONNECTOR IDENTIFICATION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__connector-identification) . For circuit identification and wiring diagram, see «RAM VAN & RAM WAGON»(/dodge/ram-van-b3500/1999-1999/remont/wiring-diagrams-engine-performance/#engine-performance-wiring-diagrams) wiring diagram in WIRING DIAGRAMS article.
2. Turn ignition off. Remove starter relay. Starter relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Using a 12-volt test light connected to ground, probe starter relay connector, fused B+ circuit. If test light illuminates brightly, go to next step. If test light does illuminate brightly, repair fused B+ circuit for open or high resistance. Perform TEST VER-1A.
3. Ensure ignition is off. Ensure starter relay is still removed. Using 12-volt test light connected to ground, probe starter relay connector, ignition switch output circuit while holding ignition key in START position. If test light illuminates brightly, go to next step. If test light does illuminate brightly, repair ignition switch output circuit for open or high resistance. Perform TEST VER-1A. WARNING: Engine may crank in following step. Keep away from moving engine parts.
4. Ensure ignition is off. Ensure starter relay is still removed. Ensure gear selector is in Park or Neutral position and parking brake is set. Briefly connect a jumper wire between starter relay connector, fused B+ and ignition switch output circuits. If starter motor cranks, go to next step. If starter motor does not crank, go to step 7).
5. Ensure ignition is off. Disconnect jumper wire. Ensure starter relay is still removed. Using an ohmmeter, check resistance of starter relay connector, P/N position switch output circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open P/N position switch output circuit. Perform TEST VER-1A.
6. At this time, starter relay is assumed to be defective. Replace starter relay. Perform TEST VER-1A.
7. Ensure ignition is off. Ensure starter relay is still removed. Ensure engine is able to turn over manually. If engine is not seized, go to next step. If engine is seized, repair mechanical condition preventing engine from cranking. Perform TEST VER-1A.
8. Ensure ignition is off. Ensure starter relay is still removed. Disconnect starter relay output circuit connector from starter solenoid. Clean and/or repair connector as necessary. Using an ohmmeter, check resistance of starter relay output circuit between starter relay connector and starter solenoid. If resistance is 5 ohms or more, repair open starter relay output circuit. Perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
9. Ensure ignition is off. Reinstall starter relay. Check battery cables for high resistance. If either cable has a voltage drop of more than 0.2 volt, replace battery cable(s). Perform TEST VER-1A. If battery cables are okay, go to next step.
10. At this time, starter is assumed to be defective. Replace starter. Perform TEST VER-1A.

TEST NS-10A: REPAIRING NO CRANK CONDITION (M/T)

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see RAM VAN & RAM WAGON wiring diagram in WIRING DIAGRAMS article.

1. Turn ignition off. Remove starter relay. Starter relay is located in Power Distribution Center (PDC). PDC is located next to battery. Refer to label under PDC cover for relay location. Clean and/or repair connector as necessary. Using a voltmeter, check voltage on starter relay connector, ignition switch output circuit while holding ignition key in START position and depressing clutch pedal. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, go to step 11).
2. Ensure ignition is off. Ensure starter relay is still removed. Using voltmeter, check voltage on starter relay connector, fused B+ circuit. If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open fused B+ circuit . Perform TEST VER-1A. WARNING: Engine may crank in following step. Keep away from moving engine parts.
3. Ensure ignition is off. Ensure starter relay is still removed. Ensure gear selector is in Neutral position and parking brake is set. Briefly connect a jumper wire between starter relay connector, fused B+ and ignition switch output circuits. If starter motor cranks, go to next step. If starter motor does not crank, go to step 6).
4. Ensure ignition is off. Ensure starter relay is still removed. Using an ohmmeter, check resistance of starter relay connector, ground circuit. If resistance is more than 5 ohms, repair open ground circuit. Perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
5. At this time, starter relay is assumed to be defective. Replace starter relay. Perform TEST VER-1A.
6. Ensure ignition is off. Ensure starter relay is still removed. Ensure engine is able to turn over manually. If engine is not seized, go to next step. If engine is seized, repair mechanical condition preventing engine from cranking. Perform TEST VER-1A.
7. Ensure ignition is off. Ensure starter relay is still removed. Using an ohmmeter, check resistance of starter relay connector, ground circuit. If resistance is more than 5 ohms, repair open ground circuit. Perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
8. Ensure ignition is off. Ensure starter relay is still removed. Disconnect starter relay output circuit connector from starter solenoid. Clean and/or repair connector as necessary. Using ohmmeter, check resistance of starter relay output circuit between starter relay connector and starter solenoid. If resistance is 5 ohms or more, repair open starter relay output circuit. Perform TEST VER-1A. If resistance is less than 5 ohms, go to next step.
9. Ensure ignition is off. Reinstall starter relay. Check battery cables for high resistance. If either cable has a voltage drop of more than 0.2 volt, replace battery cable(s). Perform TEST VER-1A. If battery cables are okay, go to next step.
10. At this time, starter is assumed to be defective. Replace starter. Perform TEST VER-1A.
11. Ensure ignition is off. Ensure starter relay is still removed. Using voltmeter, check voltage on starter relay connector, fused B+ circuit. If voltage is 10 volts or more, go to next step. If voltage is less than 10 volts, repair open fused B+ circuit . Perform TEST VER-1A.
12. Ensure ignition is off. Ensure starter relay is still removed. Disconnect Clutch Pedal Position (CPP) switch connector. Clean and/or repair connector as necessary. CPP switch is located on clutch master cylinder. Clean and/or repair connector as necessary. Using voltmeter, check voltage on CPP switch connector, ignition switch output circuit while holding ignition key in START position. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open ignition switch output circuit. Perform TEST VER-1A.
13. Ensure ignition is off. Ensure starter relay is still removed. Using an ohmmeter, check resistance of starter relay connector, ground circuit. If resistance is more than 5 ohms, repair open ground circuit. Perform TEST VER-1A. If resistance is 5 ohms or less, go to next step.
14. Ensure ignition is off. Ensure starter relay is still removed. Ensure CPP switch connector is still disconnected. Connect a jumper wire across CPP switch connector terminals. Using a voltmeter, check voltage on CPP switch connector, ignition switch output circuit while holding ignition key in START position. If voltage is more than 10 volts, replace clutch master cylinder. Perform TEST VER-1A. If voltage is 10 volts or less, go to next step.
15. At this time, ignition switch output circuit between CPP switch and starter relay is assumed to be open. Repair open ignition switch output circuit. Perform TEST VER-1A.

TEST VER-1A

Note. If Powertrain Control Module (PCM) is replaced, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. To program PCM and erase DTCs from ABS and SRS modules, proceed to appropriate procedure listed below. On models equipped with a Smart Key Immobilizer Module (SKIM), if replacing Powertrain Control Module (PCM), secret key data must also be updated to enable engine starting. To update secret key data, proceed to appropriate procedure listed below.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS Modules - Connect scan tool to Data Link Connector (DLC). Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules. Go to FINAL PROCEDURE.

Procedure For Updating Secret Key Data - Connect scan tool to Data Link Connector (DLC). Go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from Smart Key Immobilizer Module (SKIM) to PCM. Go to FINAL PROCEDURE.

Final Procedure

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Inspect engine oil for fuel contamination. Change engine oil and filter as necessary. Attempt to start engine.
2. If engine does not start, check for Technical Service Bulletins (TSBs) that apply to vehicle and return to «TEST NS-1A: QUALIFYING NO START CONDITION»(/dodge/ram-van-b3500/1999-1999/remont/testing-diagnostics/#engine-controls-tests-wcodes__test-ns-1a-qualifying-no-start-condition) if necessary. If engine starts, repair is complete. Go to next step.
3. Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.

TEST VER-2A

Note. If Powertrain Control Module (PCM) is replaced, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. To program PCM and clear DTCs from ABS and SRS modules, proceed to appropriate procedure listed below. On models equipped with a Smart Key Immobilizer Module (SKIM), if replacing Powertrain Control Module (PCM), secret key data must also be updated to enable engine starting. To update secret key data, proceed to appropriate procedure listed below.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS Modules Connect scan tool to Data Link Connector (DLC). Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules. Go to FINAL PROCEDURE.

Procedure For Updating Secret Key Data Connect scan tool to Data Link Connector (DLC). Go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from Smart Key Immobilizer Module (SKIM) to PCM. Go to FINAL PROCEDURE.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If test is being performed after performing a NO TROUBLE CODE (NTC) test, go to next step. If test is being performed after performing an OBD-II TROUBLE CODE test, perform TEST VER-5A. If test is being performed after any other TROUBLE CODE test, go to step 3).
2. Check if initial symptom still exists. If initial or another symptom exists, repair is not complete. Check for Technical Service Bulletins (TSBs) that apply to symptom and return to TEST NTC-1A: NO TROUBLE CODE TEST MENU, or appropriate TROUBLE SHOOTING - NO CODES article for diagnosis by symptom. If initial symptom no longer exists, test is complete. Go to step 8).
3. If any DTCs have not been diagnosed, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If all DTCs have been diagnosed and repaired, go to next step.
4. If Powertrain Control Module (PCM) has not been replaced, use scan tool to clear DTCs from PCM. Using scan tool, reset all values in adaptive memory. To ensure no other DTCs remain, go to next step.
5. If PCM has not been replaced, and TEST VER-2A is being performed after an A/C relay control circuit DTC test, ensure A/C is on and go to next step.
6. Road test vehicle for at least 5 minutes. Road test vehicle at a speed of at least 40 MPH at some point during road test. Stop vehicle. Turn engine off for at least 10 seconds. Start engine and continue road test. Ensure transmission shifts through all gears. After road test, turn engine off and go to next step.
7. Using scan tool, read DTCs. If any DTC returns, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to next step.
8. Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.

TEST VER-3A

Note. If Powertrain Control Module (PCM) is replaced, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. To program PCM and clear DTCs from ABS and SRS modules, proceed to appropriate procedure listed below. On models equipped with a Smart Key Immobilizer Module (SKIM), if replacing Powertrain Control Module (PCM), secret key data must also be updated to enable engine starting. To update secret key data, proceed to appropriate procedure listed below.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS Modules - Connect scan tool to Data Link Connector (DLC). Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules. Go to FINAL PROCEDURE.

Procedure For Updating Secret Key Data - Connect scan tool to Data Link Connector (DLC). Go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from Smart Key Immobilizer Module (SKIM) to PCM. Go to FINAL PROCEDURE.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If Powertrain Control Module (PCM) has not been replaced, use scan tool to erase DTCs. To ensure no charging system problem exists, start engine. Increase engine speed to 2000 RPM for at least 30 seconds. Allow engine to idle. Turn engine off. Turn ignition on, with engine off and go to next step.
2. Using scan tool, read DTCs. If any DTC returns, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to next step.
3. Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.

TEST VER-4A

Note. TEST VER-4A is related to cruise control system diagnostics. See appropriate CRUISE CONTROL SYSTEMS in ACCESSORIES & EQUIPMENT section.

TEST VER-5A

Note. If Powertrain Control Module (PCM) is replaced, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. To program PCM and clear DTCs from ABS and SRS modules, proceed to appropriate procedure listed below. On models equipped with a Smart Key Immobilizer Module (SKIM), if replacing Powertrain Control Module (PCM), secret key data must also be updated to enable engine starting. To update secret key data, proceed to appropriate procedure listed below.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS Modules Connect scan tool to Data Link Connector (DLC). Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules. Go to FINAL PROCEDURE.

Procedure For Updating Secret Key Data Connect scan tool to Data Link Connector (DLC). Go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from Smart Key Immobilizer Module (SKIM) to PCM. Go to FINAL PROCEDURE.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, return to appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table and finish diagnosing remaining DTCs as necessary. If all DTCs have been diagnosed and repaired, go to next step.
2. Connect scan tool to Data Link Connector (DLC) if not previously done. Ensure fuel tank is at least 1/4 full. Ensure A/C is off. Go to next step.
3. Proper way to ensure DTC is repaired is to allow Powertrain Control Module (PCM) to run monitor. Monitor operation may be observed on scan tool. All specified enabling conditions for specified DTC must be met before PCM will operate monitor. Go to next step.
4. Using scan tool, monitor pretest enabling conditions until all conditions have been met. Once all enabling conditions are met, observe appropriate monitor for DTC on scan tool. If repaired DTC has reset or the OBDII monitor failed while on road test, repair is not complete. Check for related Technical Service Bulletins (TSBs) and return to appropriate test listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to step 6).
5. If another DTC exists, return to appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to next step.
6. Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.

TEST VER-5A2

1. Connect scan tool to Data Link Connector (DLC). Using scan tool, monitor SIMILAR CONDITIONS to attempt to duplicate conditions that vehicle was operating at when DTC was set. If conditions can be duplicated, GOOD TRIP COUNTER will change to one or more. If conditions cannot be duplicated, use scan tool to erase DTCs. Disconnect scan tool from DLC. Go to next step.
2. If the repaired OBD-II DTC was reset, or OBD-II monitor failed after running, the repair is not complete. Check for related Technical Service Bulletins (TSBs) or flash updates. If repaired DTC or another DTC exists, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete.

TEST VER-5A3

1. Using scan tool, monitor pretest enabling conditions until all conditions have been met to run the appropriate monitor. Run appropriate monitor for repaired DTC. Go to next step.
2. If the repaired OBD-II DTC was reset, or the OBD-II monitor failed after running, the repair is not complete. Check for related Technical Service Bulletins (TSBs) or flash updates. If repaired DTC or another DTC exists, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If no DTCs return, test is complete. Go to next step.
3. Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.

TEST VER-6A

Note. If Powertrain Control Module (PCM) is replaced, correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into PCM to prevent Diagnostic Trouble Codes (DTCs) from being set in Anti-Lock Brake System (ABS) module and Supplemental Restraint System (SRS) module. To program PCM and clear DTCs from ABS and SRS modules, proceed to appropriate procedure listed below. On models equipped with a Smart Key Immobilizer Module (SKIM), if replacing Powertrain Control Module (PCM), secret key data must also be updated to enable engine starting. To update secret key data, proceed to appropriate procedure listed below.

Procedure For Programming PCM & Clearing DTCs From ABS & SRS Modules Connect scan tool to Data Link Connector (DLC). Using scan tool, enter correct VIN and mileage into PCM. Using scan tool manufacturer's instructions, clear DTCs from ABS and SRS modules. Go to FINAL PROCEDURE.

Procedure For Updating Secret Key Data Connect scan tool to Data Link Connector (DLC). Go to ENGINE and then MISC menus on scan tool. Place SKIM in SECURED ACCESS MODE by using appropriate Personal Identification Number (PIN) for this vehicle. PIN may be obtained from owner, vehicle's invoice, or from manufacturer. Select UPDATE THE SECRET KEY DATA. Data will be transferred from Smart Key Immobilizer Module (SKIM) to PCM. Go to FINAL PROCEDURE.

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If all DTCs have been diagnosed and repaired, go to next step. NOTE: Engine must remain at idle with shift lever in Park, and throttle at idle position when performing LDP dealer test. This test will only store a small leak DTC to indicate there is a problem with system. System failure may have been caused by a large leak, but PCM will only set small leak DTC to indicate that a failure occurred during test. NOTE: LDP DEALER TEST MODE is used when performing this test to verify repairs and check operation of leak detection pump system. When performing this test, operating mode of Powertrain Control Module (PCM) will be changed. It is critical that LDP dealer test mode not be interrupted. If LDP dealer test mode is interrupted, PCM will remain in changed mode. This will cause PCM to illuminate MIL for 8-10 miles of driving and no DTCs will be stored in PCM. Clearing DTCs from PCM will not change MIL operation. If a vehicle is found with PCM stuck in this changed mode, LDP dealer test should be performed in its entirety so proper PCM operating mode may be obtained.
2. Connect scan tool to Data Link Connector (DLC) if not previously done. Ensure all accessories are off. Start engine and allow it to idle. Ensure shift lever is in Park and throttle is in idle position. Place scan tool in LDP DEALER TEST MODE and follow instructions as displayed on scan tool. If a DTC for a small leak is set, repair is not complete. Check for related Technical Service Bulletins (TSBs) and return to DTC test from which you came. If another DTC exists, perform appropriate test(s) listed under SELF-DIAGNOSTIC TESTS. See DTC MESSAGES & CODES table. If all DTCs have been diagnosed and repaired, test is complete. Go to next step.
3. Turn ignition on, with engine off. Using scan tool, erase DTCs. Turn ignition off. Disconnect scan tool. Test is complete.

SUMMARY

If no Diagnostic Trouble Codes (DTCs) or only pass codes (system functioning properly) are found during self-diagnostics, proceed to TEST NTC-1A: NO TROUBLE CODE TEST MENU , or TROUBLE SHOOTING - NO CODES - GASOLINE article for diagnosis by symptom.

See also:
• TROUBLE SHOOTING - NO CODES - GASOLINE
• VEHICLE COMMUNICATIONS
• GENERATORS & REGULATORS -- TRUCKS & RWD VANS
• RAM VAN & RAM WAGON
• FUEL PRESSURE TEST
• FUEL PRESSURE LEAKDOWN TEST
• FUEL PUMP AMPERAGE TEST
• FUEL PUMP CAPACITY TEST
• HIGH PRESSURE CUT-OUT SWITCH
• VEHICLE THEFT/SECURITY SYSTEM
• FIRING ORDER & TIMING MARKS
• ENGINE COMPRESSION
• TEST NTC-1A: NO TROUBLE CODE TEST MENU
• INACTIVE DTC CONDITION
• FUEL PRESSURE RELEASE
• TEST NS-SEL: NO START SELECTION MENU
• P0107
• P0108
• P0112
• P0113
• P0117
• P0118
• P0121
• P0122
• P0123
• P0125
• P0131
• P0132
• P0133
• P0135
• P0137
• P0138
• P0139
• P0141
• P0171
• P0172
• P0201
• P0202
• P0203
• P0204
• P0205
• P0206
• P0207
• P0208
• P0300
• P0301
• P0302
• P0303
• P0304
• P0305
• P0306
• P0307
• P0308
• P0320
• P0340
• P0351
• P0420
• P0441
• P0442
• P0443
• P0455
• P0460
• P0462
• P0463
• P0500
• P0505
• P0601
• P0622
• P0645
• P1195
• P1281
• P1282
• P1294
• P1296
• P1297
• P1388
• P1389
• P1391
• P1398
• P1486
• P1492
• P1493
• P1494
• P1495
• P1594
• P1682
• P1696
• CONNECTOR IDENTIFICATION
• 2A
• 4A
• 9A
• 12A
• 13A
• 16A
• 17A
• 3A
• 5A
• 18A
• 10A
• 8A
• NTC-6A
• NTC-7A
• NTC-11A
• NTC-14A
• NTC-15A
• NTC-19A
• NTC-20A
• NTC-21A
• NTC-22A
• TEST NS-6B: REPAIRING NO RESPONSE CONDITION
• TEST NS-6C: REPAIRING NO RESPONSE CONDITION
• TEST NS-8A: REPAIRING START & STALL CONDITION
• TEST NS-5A: CHECKING FUEL PUMP
• TEST NS-1A: QUALIFYING NO START CONDITION