Engine Controls - Tests W/codes - 3.9l Dodge Ram Van B2500 B pre

INTRODUCTION

If no faults were found while performing procedures in the BASIC TESTING - 3.9L article, proceed with self-diagnostics. If no trouble codes or only pass codes are present after entering self-diagnostics, proceed to TEST NTC-1A in this article and to appropriate TESTS W/O CODES - GASOLINE article below for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

1. «TESTS W/O CODES - GASOLINE»(ref-11123) (for Dakota)
2. «TESTS W/O CODES - GASOLINE»(ref-11131) (for Ram Pickup)
3. «TESTS W/O CODES - GASOLINE»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wo-codes-gasoline) (for Ram Van/Wagon)

SYSTEM DIAGNOSTICS

Note. Self-diagnostic tests are written specifically for Chrysler's Diagnostic Readout Box (DRB). A generic scan tool may not be capable of performing all necessary test functions. Malfunction Indicator Light (MIL), also known as CHECK ENGINE light can be used, but has limited diagnostic capability.

The self-diagnostic capabilities of this system, if properly utilized, can simplify testing. The Powertrain Control Module (PCM) monitors several different engine control system circuits.

If a problem is sensed with a monitored circuit, PCM memory stores a trouble code, the Malfunction Indicator Light (MIL) glows and PCM enters limp-in mode. In limp-in mode, PCM compensates for component failure by substituting information from other sources. This allows vehicle operation until repairs can be made.

Test circuits and repair or replace components as required. If problem is repaired or ceases to exist, the PCM cancels trouble code after approximately 50 ignition on/off cycles.

A specific trouble code results from a particular system failure. A trouble code does not condemn a specific component; component is not necessarily the reason for failure. Trouble codes only call out a probable malfunction area.

Hard Failures

Hard failures cause MIL to glow and remain on until the malfunction is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using self-diagnostic tests. If a sensor fails, PCM will use a substitute value in its calculations, allowing engine to operate in limp-in mode. In this condition, vehicle will run, but driveability may be poor.

Intermittent Failures

Intermittent failures may cause MIL to flicker or stay on until the intermittent trouble code goes away. However, the corresponding trouble code will be retained in PCM memory. If related trouble code does not reoccur within a certain time frame, related trouble code will be erased from PCM memory. Intermittent failures can be caused by a faulty sensor, bad connector or wiring related problems.

MODEL IDENTIFICATION

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

BODY CODE DESIGNATION

SERVICE PRECAUTIONS

Before proceeding with diagnosis, the following precautions must be followed

1. Always check if any Technical Service Bulletins (TSBs) apply to vehicle.
2. ALWAYS relieve fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. See «FUEL PRESSURE RELEASE»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__fuel-pressure-release) .
3. When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See «COMPUTER RELEARN PROCEDURES»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/computer-relearn/#computer-relearn-procedures) article in GENERAL INFORMATION section before disconnecting battery.
4. Vehicle must have a fully charged battery and functional charging system.
5. Probe PCM 60-pin connector from pin side. DO NOT backprobe PCM connector.
6. DO NOT cause short circuits when performing electrical tests. This will set additional trouble codes, making diagnosis of original problem more difficult.
7. DO NOT use a test light instead of a voltmeter.
8. When checking for spark, ensure coil wire is NO more than 1/4" from ground. If coil wire is more than 1/4" from ground, damage to vehicle electronics and/or PCM may result.
9. DO NOT prolong testing of fuel injectors, or engine may hydro-statically (liquid) lock.
10. Always repair lowest trouble code number (MIL) or first trouble code message displayed (scan tool) first.
11. Always perform verification procedure test after repairs are made.
12. Always disconnect scan tool after use.
13. Always disconnect scan tool before charging battery.

VISUAL INSPECTION

Most driveability problems in the engine control system result from faulty wiring, poor electrical connections, or leaking air and vacuum hose connections. To avoid unnecessary component testing, perform a visual inspection before beginning self-diagnostic tests.

DIAGNOSTIC PROCEDURE

Note. DO NOT skip any steps in self-diagnostic tests, or incorrect diagnosis may result. Ensure self-diagnostic tests apply to engine being tested.

If no trouble codes were found while performing BASIC DIAGNOSTIC PROCEDURES, proceed with self-diagnostics. Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION . Enter on-board diagnostics, and retrieve trouble code(s) using MIL or scan tool. Refer to the ENTERING ON-BOARD DIAGNOSTICS . If trouble codes are not present and/or scan tool is used, proceed to TEST TC-1A. Perform indicated VERIFICATION PROCEDURE test after repairs.

ENTERING ON-BOARD DIAGNOSTICS

Note. Although other scan testers are available, manufacturer recommends using DRB (Diagnostic Readout Box) to diagnose the system. Malfunction Indicator Light (MIL), also known as CHECK ENGINE light function can be used, but has limited diagnostic capability.

Malfunction Indicator Light (MIL) Mode

1. Start engine (if possible). Move transmission shift lever through all positions, ending in Park. Turn A/C switch on and then off (if equipped).
2. Turn engine off. Without starting engine again, turn ignition on, off, on, off and on within 5 seconds. Record 2-digit trouble codes as displayed by flashing MIL.
3. For example, Trouble Code 23 is displayed as flash, flash, 4-second pause, flash, flash, flash. After a slightly longer pause, other codes stored are displayed in numerical order.
4. When MIL begins to flash trouble codes, it cannot be stopped. Start over if count is lost. Code 55 indicates end of trouble code display.
5. Refer to «TROUBLE CODES/MESSAGES»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__trouble-codesmessages) to translate trouble code number to a scan tool trouble code message. Once trouble area is identified, proceed to TEST TC-1A. Use scan tool trouble codes to find appropriate test.
6. As an example, a 3.0L engine starts and runs but has a driveability problem. MIL indicates a Code 14. Refer to «TROUBLE CODES/MESSAGES»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__trouble-codesmessages) to translate trouble code number to a scan tool trouble code message.
7. When scan tool trouble code message is obtained, refer to appropriate test number. To clear trouble codes, see «CLEARING TROUBLE CODES»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__clearing-trouble-codes) .

Scan Tool Diagnostic Mode

1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). See «DATA LINK CONNECTOR (DLC)»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l) table for connector location. (Scheme 1)-3. DATA LINK CONNECTOR (DLC) Application DLC Location Dakota & Ram Pickup Right Rear Corner Of Engine Compartment Ram Van/Wagon Center Of Dash Panel In Engine Compartment, Near PCM
2. Start engine (if possible). With foot on brake, move transmission shift lever through all positions, ending in Park. Turn A/C switch on and then off (if equipped).
3. Turn engine off. Without starting engine again, turn ignition on. Using scan tool, access and record trouble codes.
4. When scan tool trouble code message is obtained, refer to appropriate test number. To clear trouble codes, see «CLEARING TROUBLE CODES»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__clearing-trouble-codes).

Scheme 1

Scheme 2

Scheme 3

CLEARING TROUBLE CODES

1. If scan tool is not available, go to next step. If scan tool is available, follow prompts to erase trouble codes.
2. Trouble codes may be cleared by disconnecting negative battery cable for at least 15 seconds, allowing PCM to clear trouble codes.

INACTIVE TROUBLE CODE CONDITION

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

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

FUEL PRESSURE RELEASE

1. Turn ignition off. Disconnect negative battery cable. Slowly open fuel tank cap to release pressure in tank. Remove fuel rail pressure test port cap. Obtain fuel pressure gauge/hose assembly from Fuel Pressure Gauge Set (5069).
2. Place open end of fuel pressure gauge/hose assembly in an approved gasoline container. Connect other end of pressure gauge/hose assembly to test port. As fuel pressure gauge/hose is tightened onto fuel rail pressure test port, fuel pressure will bleed-off into container.

TROUBLE CODES/MESSAGES

Note. Not all trouble codes apply to all vehicles. Some trouble codes have more than one meaning. When a trouble code has more than one meaning, MIL is unable to distinguish between different failures.

CODE 11

DRB displays NO CRANK REFERENCE SIGNAL AT PCM. Condition is: no crankshaft reference signal detected during cranking.

CODE 12

On AB and AN bodies, DRB displays BATTERY DISCONNECT. On BR body, DRB display is blank. Condition is: Direct battery input to Powertrain Control Module (PCM) disconnected within last 50 key-on cycles.

CODE 13

DRB displays NO CHANGE IN MAP FROM START TO RUN. Condition is: no difference recognized between Manifold Absolute Pressure (MAP) reading and barometric (atmospheric) pressure reading at start-up.

CODE 14

DRB displays MAP SENSOR VOLTAGE TOO LOW. Condition is: Manifold Absolute Pressure (MAP) sensor input less than minimum acceptable voltage.

DRB displays MAP SENSOR VOLTAGE TOO HIGH. Condition is: Manifold Absolute Pressure (MAP) sensor input more than maximum acceptable voltage.

CODE 15

DRB displays NO VEHICLE SPEED SENSOR SIGNAL. Condition is: no Vehicle Speed Sensor (VSS) signal detected with road load conditions.

CODE 17

DRB displays ENGINE IS COLD TOO LONG. Condition is: coolant temperature stays less than normal operating temperature during vehicle operation.

CODE 21

DRB displays O2S STAYS AT CENTER. Condition is: no rich or lean signal detected from oxygen sensor input. DRB will display left or right O2S (if equipped).

DRB displays O2S SHORTED TO VOLTAGE. Condition is: oxygen sensor input voltage maintained at more than normal operating range. DRB will display left or right O2S (if equipped).

CODE 22

DRB displays ECT SENSOR VOLTAGE TOO LOW. Condition is: Engine Coolant Temperature (ECT) sensor input less than minimum acceptable voltage.

DRB displays ECT SENSOR VOLTAGE TOO HIGH. Condition is: Engine Coolant Temperature (ECT) sensor input more than maximum acceptable voltage.

CODE 23

On AB and AN bodies, DRB displays INTAKE AIR TEMPERATURE SENSOR VOLTAGE LOW. Condition is: Intake Air Temperature (IAT) sensor input less than minimum acceptable voltage.

On AB and AN bodies, DRB displays INTAKE AIR TEMPERATURE SENSOR VOLTAGE HIGH. Condition is: Intake Air Temperature (IAT) sensor input more than maximum acceptable voltage.

CODE 24

DRB displays THROTTLE POSITION SENSOR VOLTAGE LOW. Condition is: Throttle Position (TP) sensor input less than minimum acceptable voltage.

DRB displays THROTTLE POSITION SENSOR VOLTAGE HIGH. Condition is: Throttle Position (TP) sensor input more than maximum acceptable voltage.

CODE 25

DRB displays IDLE AIR CONTROL MOTOR CIRCUITS. Condition is: open or shorted condition detected in one or more Idle Air Control (IAC) motor circuits.

CODE 27

DRB displays INJECTOR (#1-#8) CONTROL CIRCUIT. Condition is: injector output driver does not respond properly to Powertrain Control Module (PCM) control signal.

CODE 31

DRB displays EVAP SOLENOID CIRCUIT. Condition is: open or shorted condition detected in purge solenoid circuit.

CODE 32

DRB displays EGR SOLENOID CIRCUIT. Condition is: open or shorted condition detected in EGR solenoid circuit.

DRB displays EGR SYSTEM FAILURE. Condition is: required change in air/fuel ratio not detected during diagnostic test.

CODE 33

DRB displays A/C CLUTCH RELAY CIRCUIT. Condition is: open or shorted condition detected in A/C clutch relay circuit.

CODE 34

DRB displays SPEED CONTROL SOLENOID CIRCUITS. Condition is: open or shorted condition detected in speed control vacuum or vent solenoid circuits.

DRB displays SPEED CONTROL SWITCH ALWAYS LOW. Condition is: speed control switch input less than minimum acceptable level.

DRB displays SPEED CONTROL SWITCH ALWAYS HIGH. Condition is: speed control switch input more than maximum acceptable level.

CODE 35

On AN body, DRB displays RADIATOR FAN RELAY CIRCUIT. Condition is: open or shorted condition detected in radiator fan relay circuit.

CODE 37

On BR body, DRB displays TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT. Condition is: open or shorted condition detected in torque converter clutch solenoid circuit.

On BR body, DRB displays TRANS TEMP SENSOR VOLTAGE TOO LOW. Condition is: voltage low at transmission temperature sensor.

On BR body, DRB displays TRANS TEMP SENSOR VOLTAGE TOO HIGH. Condition is: voltage high at transmission temperature sensor.

CODE 41

DRB displays GENERATOR FIELD NOT SWITCHING PROPERLY. Condition is: open or shorted condition detected in alternator field circuit.

CODE 42

DRB displays AUTO SHUTDOWN RELAY CONTROL CIRCUIT. Condition is: open or shorted condition detected in Auto Shutdown (ASD) relay circuit.

DRB displays NO ASD RELAY OUTPUT VOLTAGE AT PCM. Condition is: Powertrain Control Module (PCM) did not receive message in Auto Shutdown (ASD) relay circuit.

CODE 43

On BR body, DRB displays IGNITION COIL (#1-#5) PRIMARY CIRCUIT. Condition is: peak primary circuit current not achieved with maximum dwell time.

CODE 44

DRB displays BATTERY TEMP SENSOR VOLTS OUT OF LIMIT. Condition is: an open or short condition exists in Engine Coolant Temperature (ECT) sensor circuit or a problem is present in Powertrain Control Module (PCM) battery temperature sensor voltage circuit.

CODE 45

On BR body, DRB displays TRANS OVERDRIVE SOLENOID CIRCUIT. Condition is: open or shorted condition detected in transmission overdrive solenoid circuit.

CODE 46

DRB displays CHARGING SYSTEM VOLTAGE TOO HIGH. Condition is: battery voltage sense input more than target charging voltage during engine operation.

CODE 47

DRB displays CHARGING SYSTEM VOLTAGE TOO LOW. Condition is: battery voltage sense input less than target charging voltage during engine operation and no significant change detected in battery voltage during active test of generator output.

CODE 51

On AB and AN bodies, DRB displays O2S STAYS BELOW CENTER (LEAN). Condition is: oxygen sensor input indicates lean air/fuel ratio during engine operation.

On BR body, DRB displays SYSTEM LEAN L-IDLE ADAP AT RICH LIMIT. Condition is: oxygen sensor signal input indicates lean air/fuel ratio condition at left O2S during engine operation. If vehicle is equipped with dual O2S, DRB will identify left or right O2S.

On BR body, DRB displays SYSTEM LEAN R-IDLE ADAP AT RICH LIMIT. Condition is: oxygen sensor signal input indicates lean air/fuel ratio condition at right O2S during engine operation. If vehicle is equipped with dual O2S, DRB will identify left or right O2S.

CODE 52

On AB and AN bodies, DRB displays O2S STAYS ABOVE CENTER (RICH). Condition is: oxygen sensor input indicates rich air/fuel ratio during engine operation.

On BR body, DRB displays SYSTEM RICH L-IDLE ADAP AT LEAN LIMIT. Condition is: oxygen sensor signal input indicates rich air/fuel ratio condition at left O2S during engine operation. If vehicle is equipped with dual O2S, DRB will identify left or right O2S.

On BR body, DRB displays SYSTEM RICH R-IDLE ADAP AT LEAN LIMIT. Condition is: oxygen sensor signal input indicates rich air/fuel ratio condition at right O2S during engine operation. If vehicle is equipped with dual O2S, DRB will identify left or right O2S.

CODE 53

DRB displays INTERNAL PCM FAILURE. Condition is: Powertrain Control Module (PCM) detects internal failure.

DRB displays PCM FAILURE SPI COMMUNICATION. Condition is: Powertrain Control Module (PCM) detects Serial Peripheral Interface (SPI) communications failure.

CODE 54

DRB displays NO CAM SYNC SIGNAL AT PCM. Condition is: open or shorted condition detected in cam sync signal circuit.

CODE 55

DRB display will be blank. Indicates completion of trouble code display by MIL.

CODE 62

DRB displays PCM FAILURE SRI MILES NOT STORED. Condition is: Powertrain Control Module (PCM) has had an unsuccessful attempt to update Service Reminder Indicator (SRI) miles in PCM EEPROM.

CODE 63

DRB displays PCM FAILURE EEPROM WRITE DENIED. Condition is: unsuccessful attempt to write to an EEPROM location by Powertrain Control Module (PCM).

CONNECTOR IDENTIFICATION

CONNECTOR IDENTIFICATION DIRECTORY

A/C CLUTCH RELAY CONNECTOR TERMINAL ID (AB BODY)

Scheme 4

A/C CLUTCH RELAY CONNECTOR TERMINAL ID (AN BODY)

Scheme 5

A/C CLUTCH RELAY CONNECTOR TERMINAL ID (BR BODY)

Scheme 6

ASD RELAY CONNECTOR TERMINAL ID (AB BODY)

Scheme 7

Scheme 8

ASD RELAY CONNECTOR TERMINAL IDENTIFICATION (AN BODY)

ASD RELAY CONNECTOR TERMINAL IDENTIFICATION (BR BODY)

Scheme 9

CAMSHAFT POSITION SENSOR CONNECTOR TERM ID (ALL MODELS)

Scheme 10

CRANKSHAFT POSITION SENSOR CONNECTOR TERMINAL ID

Scheme 11

EGR SOLENOID CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 12

ECT SENSOR CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 13

EVAPORATIVE PURGE SOLENOID CONNECTOR TERM ID (ALL MODELS)

Scheme 14

FUEL PUMP CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 15

FUEL PUMP RELAY CONNECTOR TERMINAL ID (AB & AN BODIES)

Scheme 16

Scheme 17

FUEL PUMP RELAY CONNECTOR TERMINAL ID (BR BODY)

Scheme 18

IAC MOTOR CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 19

IAT SENSOR CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 20

MAP SENSOR CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 21

O2S CONNECTOR TERMINAL ID (SINGLE O2S) (ALL MODELS)

Scheme 22

TCC RELAY CONNECTOR TERMINAL ID (ALL MODELS)

Scheme 23

TPS CONNECTOR TERMINAL IDENTIFICATION (ALL MODELS)

Scheme 24

TCC/OVERDRIVE SOLENOID CONNECTOR TERMINAL ID (AB BODY)

Scheme 25

TCC/OVERDRIVE SOLENOID CONNECTOR TERMINAL ID (AN BODY)

TCC/OVERDRIVE SOLENOID CONNECTOR TERMINAL ID (BR BODY)

TRANSMISSION TEMP SENSOR CONNECTOR TERM ID (ALL MODELS)

Scheme 26

Scheme 27

SELF-DIAGNOSTIC TESTS

Note. In following self-diagnostic tests, illustrations are courtesy of Chrysler Corp.

TEST TC-1A - CHECKING SYSTEM FOR TROUBLE CODES

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

Note. Battery must be fully charged before proceeding.

1. Battery must be fully charged before proceeding. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds. Connect scan tool to engine diagnostic connector. Record scan tool trouble codes.
2. If scan tool has a blank screen or displays an error message, this indicates a scan tool failure. To diagnose and correct these conditions, see SELF-DIAGNOSTIC TESTS in TESTS W/CODES - BODY CONTROL COMPUTER article in ENGINE PERFORMANCE section. «TESTS W/CODES - BODY CONTROL COMPUTER»(ref-11147-S09232599652000111300000) (for Dakota) «TESTS W/CODES - BODY CONTROL COMPUTER»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-body-control-computer__self-diagnostic-tests) (for Ram Pickup & Ram Van/Wagon)
3. If scan tool displays NO RESPONSE, go to TEST NS-6A. If trouble codes are displayed, see TROUBLE CODES table. If no trouble codes are displayed and a driveability problem is present, go to TEST NTC-1A. If no trouble codes are displayed and a no-start problem is present, go to TEST NS-1A.

TROUBLE CODES

TROUBLE CODES ARTICLE REFERENCES

1. «GENERATOR & REGULATOR»(ref-11148) (for Dakota)
2. «GENERATOR & REGULATOR»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/charging-system/#generator-regulator) (for Ram Pickup & Ram Van/Wagon)
3. «CRUISE CONTROL SYSTEM»(ref-123662) (for Dakota)
4. «CRUISE CONTROL SYSTEM»(ref-123663) (for Ram Pickup)
5. «CRUISE CONTROL SYSTEM»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/cruise-control-systems/#cruise-control-system) (for Ram Van/Wagon)

TEST TC-2A - NO CRANK REFERENCE SIGNAL AT PCM (DTC 11)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes. Turn ignition off and then on. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
2. Using scan tool, read trouble codes. If scan tool does not display NO CRANK REFERENCE SIGNAL AT PCM, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays NO CRANK REFERENCE SIGNAL AT PCM, go to step 6).
3. NO CRANK REFERENCE SIGNAL AT PCM trouble code sets if Powertrain Control Module (PCM) does not see a Crankshaft Position (CKP) sensor signal with Camshaft Position (CMP) sensor signal present or CKP sensor is not present during engine cranking. Possible causes are: open or shorted CKP sensor 8-volt supply circuit (Orange wire), open CKP sensor ground circuit (Black/Light Blue wire), open or shorted CKP sensor signal circuit (Gray/Black wire), improperly adjusted CKP sensor, damaged flywheel, failed CKP sensor or failed PCM. Go to next step.
4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
5. Start engine. Wiggle wiring harness from CKP sensor to PCM. If engine misfires or stalls, repair wiring harness as necessary. Perform TEST VER-2. If engine does not misfire or stall, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2. If engine does not misfire or stall, test is complete.
6. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Using scan tool in voltmeter mode, check voltage on CKP sensor connector, 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, go to TEST TC-2B.
7. If voltage is more than 7 volts, connect a jumper wire to CKP sensor signal circuit (Gray/Black wire) on CKP sensor connector harness side.
8. Using scan tool, read trouble codes. Turn ignition off and then on. Using other end of jumper wire, make and break connection at CKP sensor ground circuit (Black/Light Blue wire) on sensor connector several times while observing scan tool. If scan tool displays NO CAM SYNC SIGNAL AT PCM, replace CKP. Perform TEST VER-2.
9. If scan tool does not display NO CAM SYNC SIGNAL AT PCM, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CKP sensor connector ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2.
10. If resistance is less than 5 ohms, disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of CKP signal circuit (Gray/Black wire) between CKP sensor connector harness side and PCM connector terminal No. 24. If resistance is more than 5 ohms, repair open Gray/Black or Red/Light Green wire. Perform TEST VER-2.
12. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM connector terminal No. 24, CKP sensor signal circuit (Gray/Black wire). If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Red/Light Green or Gray/Black wire. Perform TEST VER-2.

TEST TC-2B - NO CRANK REFERENCE SIGNAL AT PCM

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. Inspect CMP sensor connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If CMP sensor connector terminals are okay, go to next step.
2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on CMP sensor connector 8-volt supply circuit (Orange wire). If voltage is more than 7 volts, replace CMP sensor. Perform TEST VER-2.
3. If voltage is less than 7 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
4. Using scan tool in ohmmeter mode, check resistance of Crankshaft Position Sensor (CKP) connector, 8-volt supply circuit (Orange wire). If resistance is less than 5 ohms, repair short to ground in Orange or White/Black wire. Perform TEST VER-2.
5. If resistance is more than 5 ohms, check resistance of 8-volt supply circuit (Orange wire) between CKP sensor harness side connector and PCM connector terminal No. 7 using an external ohmmeter. If resistance is more than 5 ohms, repair open Orange or White/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-3A - NO CAM SYNC SIGNAL AT PCM (DTC 54)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
2. Using scan tool, read trouble codes. If scan tool does not display NO CAM SYNC SIGNAL AT PCM, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays NO CAM SYNC SIGNAL AT PCM, go to step 6).
3. NO CAM SYNC SIGNAL AT PCM trouble code sets if Powertrain Control Module does not see Camshaft Position (CMP) sensor signal with Crankshaft Position (CKP) signal present. Possible causes are: failed CMP sensor, open or shorted CMP sensor signal circuit (Tan/Yellow wire), open CMP sensor 8-volt supply circuit (Orange wire), open CMP sensor ground circuit (Black/Light Blue wire), damaged pulse ring or failed PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
5. Start engine. Wiggle wiring harness from CMP sensor to PCM. If engine misfires or stalls, repair wiring harness as necessary. Perform TEST VER-2. If engine does not misfire or stall, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2. If engine does not misfire or stall, test is complete.
6. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. Using scan tool in voltmeter mode, check voltage on CMP sensor connector, 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, repair open Orange or White/Black wire. Perform TEST VER-2.
7. If voltage is more than 7 volts, connect a jumper wire to CMP signal circuit (Tan/Yellow wire) on CMP sensor connector harness side. Using other end of jumper wire, make and break connection at CMP sensor ground circuit (Black/Light Blue wire) on sensor connector several times. Without turning ignition off, attempt to start engine. If engine starts, replace CMP sensor. Perform TEST VER-2. If engine does not start, go to next step.
8. Turn ignition off. Remove distributor cap. While observing distributor rotor, have an assistant crank engine. If rotor does not turn as engine is cranked, repair distributor drive system as necessary. Perform TEST VER-2.
9. If rotor turns, turn ignition off. Check resistance of CMP sensor connector ground circuit (Black/Light Blue wire) using scan tool in ohmmeter mode. If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2.
10. If resistance is less than 5 ohms, disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
11. Using an external ohmmeter, check resistance of CMP signal circuit (Tan/Yellow wire) between CMP sensor connector harness side and PCM connector terminal No. 44. If resistance is more than 5 ohms, repair open Tan/Yellow wire or Gray/Black wire. Perform TEST VER-2.
12. If resistance is less than 5 ohms, check resistance of PCM connector terminal No. 44 (Tan/Yellow wire) using scan tool in ohmmeter mode. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Tan/Yellow wire or Gray/Black wire. Perform TEST VER-2.

TEST TC-4A - SLOW CHANGE IN IDLE MAP SENSOR SIGNAL OR NO CHANGE IN MAP FROM START TO RUN (DTC 13)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition on with engine off. Using scan tool, read trouble codes. If scan tool displays MAP SENSOR VOLTAGE TOO LOW, go to TEST TC-5A. If scan tool does not display MAP SENSOR VOLTAGE TOO LOW, go to next step.
2. Using scan tool, erase trouble codes. Start engine. Allow engine to idle for 30 seconds. With engine running, use scan tool to read trouble codes. If scan tool displays NO CHANGE IN MAP FROM START TO RUN or SLOW CHANGE IN IDLE MAP SENSOR SIGNAL, go to step 7).
3. If scan tool does not display NO CHANGE IN MAP FROM START TO RUN or SLOW CHANGE IN IDLE MAP SENSOR SIGNAL, use scan tool to set engine speed to 1500 RPM. With engine running at 1500 RPM, read Manifold Absolute Pressure (MAP) sensor voltage on scan tool. While monitoring MAP sensor voltage, wiggle MAP sensor connector and wiring harness.
4. If engine stalls or MAP sensor voltage becomes erratic, inspect all related wiring and connectors. Repair wiring or connectors as necessary. Perform TEST VER-2. If engine does not stall and MAP sensor voltage does not become erratic, snap throttle open and closed while monitoring scan tool.
5. If engine vacuum rapidly drops to less than one in. Hg, condition required to set trouble code is not present at this time. NO CHANGE IN MAP FROM START TO RUN trouble code sets if too small a difference is seen between barometric pressure at key on and manifold vacuum after engine start. SLOW CHANGE IN IDLE MAP SENSOR SIGNAL trouble code sets if variation in MAP signal is less than .157 volt and engine is at 600-1500 RPM. Possible causes for both these trouble codes are: restricted or leaking vacuum/pressure hose to MAP sensor, ice in MAP sensor or passage, MAP sensor failure or failed PCM. Perform TEST VER-2.
6. If engine vacuum does not rapidly drop to less than one in. Hg, remove MAP sensor. Inspect MAP sensor vacuum port and vacuum connector. If restriction exists, repair as necessary. Perform TEST VER-2. If restriction does not exist, replace MAP sensor. Perform TEST VER-2.
7. Turn ignition off. Tee a vacuum gauge into Manifold Absolute Pressure (MAP) sensor vacuum hose. Start engine. With engine at idle, read vacuum gauge. If reading is zero in. Hg at idle, repair leak in vacuum hose to MAP sensor. Perform TEST VER-2. If reading is not zero in. Hg, snap throttle open and closed while monitoring scan tool.
8. If engine vacuum does not rapidly drop, repair restricted vacuum hose. Perform TEST VER-2. If engine vacuum drops rapidly, turn ignition off. Disconnect MAP sensor connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector, 5-volt sensor feed circuit (Violet/White wire). If voltage is less than 4 volts, repair open Violet/White wire. Perform TEST VER-2. If voltage is more than 4 volts, replace MAP sensor. Perform TEST VER-2.

TEST TC-5A - MAP SENSOR VOLTAGE TOO LOW (DTC 14)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If voltage is less than 0.2 volt, go to step 5). If voltage is more than 0.2 volt, turn engine off. Turn ignition on.
2. Using scan tool, read MAP sensor voltage. If voltage is less than 1.2 volts, go to step 5). If voltage is more than 1.2 volts, wiggle MAP sensor connector and wiring harness while watching scan tool display. If voltage changes, repair connector or wiring harness as necessary. Perform TEST VER-2.
3. If voltage does not change, condition required to set trouble code is not present at this time. MAP SENSOR VOLTAGE TOO LOW trouble code sets if MAP sensor output is less than 1.2 volts at start or less than 0.2 volt with engine running. Engine speed must be more than 400 but less than 1500 RPM, and Throttle Position (TP) sensor voltage must be less than one volt. Possible causes are: short to ground in MAP sensor signal circuit (Dark Green/Red wire), loss of MAP sensor 5-volt supply circuit (Violet/White wire), failed MAP sensor or failed PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, test is complete. Perform TEST VER-2.
5. Turn ignition on with engine off. Disconnect MAP sensor connector. Using scan tool, read MAP sensor voltage. If voltage is more than 4 volts, replace MAP sensor. Perform TEST VER-2.
6. If voltage is less than 4 volts, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is less than 4 volts, repair open Violet/White wire. Perform TEST VER-2.
7. If voltage is more than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between MAP sensor connector signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire).
8. If resistance is less than 5 ohms, repair Dark Green/Red wire or Red/White wire for a short to Black/Light Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-6A - MAP SENSOR VOLTAGE TOO HIGH (DTC 14)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If MAP sensor voltage is more than 4.6 volts, go to step 4). If MAP sensor voltage is less than 4.6 volts, wiggle MAP sensor connector and wiring harness while watching scan tool display. If MAP sensor voltage changes, repair connector or wiring harness as necessary. Perform TEST VER-2.
2. If MAP sensor voltage does not change, condition required to set trouble code is not present at this time. MAP SENSOR VOLTAGE TOO HIGH trouble code sets if MAP sensor output is more than 4.6 volts at start or with engine running. Engine speed must be more than 400 but less than 1500 RPM, and Throttle Position (TP) sensor voltage must be less than one volt. Possible causes are: open MAP sensor signal circuit (Dark Green/Red wire), MAP sensor open internally, open MAP sensor ground circuit (Black/Light Blue wire) or short to voltage in MAP sensor signal circuit (Dark Green/Red wire). Go to next step.
3. Inspect all related wiring and connectors. Repair wiring or connectors as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, test is complete. Perform TEST VER-2.
4. Turn ignition off. Disconnect MAP sensor connector. Connect a jumper wire between signal circuit (Dark Green/Red wire) and ground circuit (Black/Light Blue wire) on MAP sensor connector. Turn ignition on. Using scan tool, read MAP sensor voltage. If scan tool displays NO RESPONSE, repair MAP sensor signal circuit (Dark Green/Red wire) for a short to 5-volt supply circuit (Violet/White wire). Perform TEST VER-2. If scan tool does not display NO RESPONSE, go to next step.
5. If voltage is less than one volt, replace MAP sensor. Perform TEST VER-2. If MAP sensor voltage is more than one volt, move jumper wire from MAP sensor connector, ground circuit (Black/Light Blue wire) to an engine ground. Using scan tool, read MAP sensor voltage.
6. If MAP sensor voltage is less than one volt, repair open Black/Light Blue wire. Perform TEST VER-2. If MAP sensor voltage is more than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
7. Using an external ohmmeter, check resistance of signal circuit (Dark Green/Red wire) between MAP sensor connector and PCM connector terminal No. 1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Dark Green/Red wire or Red/White wire. Perform TEST VER-2.

TEST TC-7A - NO VEHICLE SPEED SENSOR SIGNAL (DTC 15)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Raise vehicle so drive wheels are free to spin. Start engine. Using scan tool, read Vehicle Speed Sensor (VSS) signal. Put transmission in any forward gear. If scan tool displays more than zero MPH, go to next step. If scan tool does not display more than zero MPH, go to step 4).
2. Condition required to set trouble code is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL trouble code sets if Powertrain Control Module (PCM) does not see a VSS signal at PCM terminal No. 47 (White/Orange wire) for more than 11 seconds. Possible causes are: open or shorted VSS signal circuit (White/Orange wire), open VSS sensor 8-volt supply circuit (Orange wire), open VSS sensor ground circuit (Black/Light Blue wire), failed VSS sensor, damaged speedometer pinion or failed PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
4. Turn ignition off. Disconnect Vehicle Speed Sensor (VSS) connector. Inspect VSS connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
5. Turn ignition on. Using scan tool in voltmeter mode, check voltage on VSS connector, 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, repair open Orange wire or White/Black wire. Perform TEST VER-2.
6. If voltage is more than 7 volts, check voltage on VSS connector, signal circuit (White/Orange wire). If voltage is less than 4 volts, go to TEST TC-7B. If voltage is more than 4 volts, connect a jumper wire between VSS signal circuit (White/Orange wire) and ground circuit (Black/Light Blue wire) on VSS sensor connector.
7. Turn ignition on. Using scan tool, read VSS signal. Make and break connection at VSS sensor connector several times while observing scan tool display. If scan tool does not display more than zero MPH, go to TEST TC-7B. If scan tool displays more than zero MPH, remove VSS from vehicle.
8. Inspect speedometer pinion gear. Repair as necessary. Perform TEST VER-2. If pinion gear is okay, replace VSS. Perform TEST VER-2.

TEST TC-7B - NO VEHICLE SPEED SENSOR SIGNAL

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of VSS connector, sensor ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2. If resistance is less than 5 ohms, go to next step.
2. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
3. Using an external ohmmeter, check resistance of VSS signal circuit (White/Orange) wire between VSS connector and PCM connector terminal No. 47. If resistance is more than 5 ohms, repair open White/Orange wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, check resistance of PCM connector terminal No. 47 (White/Orange wire) using scan tool in ohmmeter mode. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in White/Orange wire. Perform TEST VER-2.

TEST TC-8A - O2S STAYS AT CENTER OR LEFT O2S STAYS AT CENTER (DTC 21)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read O2S state.
2. If O2S is not switching from rich to lean, go to step 7). If O2S is switching from rich to lean, wiggle sensor connector and wiring harness while watching scan tool display.
3. If O2S stopped switching, inspect all related wiring, paying particular attention to O2S signal circuit (Black/Dark Green wire) and connectors. Repair as necessary. Perform TEST VER-2. If O2S did not stop switching, condition required to set trouble code is not present at this time. Go to next step.
4. O2S STAYS AT CENTER trouble code sets if O2S output voltage stays at 0.5 volt for 1.5 minutes with engine temperature more than 170°F (77°C) and engine running for 2 minutes. Possible causes are: open O2S circuit or O2S failure. Go to next step.
5. LEFT O2S STAYS AT CENTER trouble code sets if O2S signal voltage is more than 4.8 volts with engine temperature more than 170°F (77°C) and engine running for 2 minutes. Possible causes are: O2S failure, open O2S signal circuit or open O2S ground circuit. Go to next step.
6. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, test is complete. Perform TEST VER-2. NOTE: When performing steps 7)-10) on dual O2S systems, disconnect left O2S connector.
7. Turn ignition off. Disconnect O2S connector (on dual O2S system, disconnect left O2S connector). Turn ignition on. Using scan tool in voltmeter mode, check voltage on O2S signal circuit (Black/Dark Green wire) at O2S connector harness side. If voltage is less than 10 volts, go to next step. If voltage is more than 10 volts, repair appropriate wire for a short to voltage. Perform TEST VER-2.
8. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of O2S ground circuit (Black/Light Blue wire) at O2S connector harness side. If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2.
9. If resistance is less than 5 ohms, connect a jumper wire between O2S signal circuit (Black/Dark Green wire) at O2S connector harness side and ground. Using scan tool, read O2S voltage. If O2S voltage is less than 0.2 volt, replace O2S. Perform TEST VER-2.
10. If O2S voltage is more than 0.2 volt, disconnect jumper wire. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of O2S signal circuit (Black/Dark Green wire) between O2S connector harness side and PCM connector terminal No. 41. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open O2S signal circuit. Perform TEST VER-2.

TEST TC-9A - RIGHT O2S STAYS AT CENTER (DTC 21)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read RT O2S voltage. If RT O2S voltage is switching between less than 0.4 volt to more than 0.6 volt, go to next step. If RT O2S is not switching between less than 0.4 volt to more than 0.6 volt, go to step 5).
2. Wiggle RT O2S connector and wiring harness while watching scan tool display. If RT O2S voltage goes to more than 4.8 volts at any time, repair wiring and connectors as necessary. Perform TEST VER-2. If voltage does not go to more than 4.8 volts at any time, condition required to set trouble code is not present at this time. Go to next step.
3. RIGHT O2S STAYS AT CENTER trouble code sets if RT O2S signal circuit voltage is more than 4.8 volts after engine is running for more than 2 minutes with engine temperature more than 176°F (80°C). Possible causes are: RT O2S failure, open RT O2S signal circuit (Black/Dark Green wire) or open RT O2S ground circuit (Black/Light Blue wire). Go to next step.
4. Inspect all related wiring and connectors. Repair wiring or connectors as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Test is complete. Perform TEST VER-2.
5. Turn ignition on with engine off. Disconnect RT O2S connector. Using scan tool in voltmeter mode, check voltage of RT O2S signal circuit (Black/Dark Green wire) on RT O2S harness connector. If voltage is less than 10 volts, go to next step. If voltage is more than 10 volts, repair short to voltage on Black/Dark Green wire. Perform TEST VER-2.
6. Put scan tool in ohmmeter mode. Using scan tool, check resistance on RT O2S ground circuit (Black/Light Blue wire) on RT O2S harness connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
7. Connect a jumper wire between RT O2S signal circuit (Black/Dark Green wire) and ground. Using scan tool, read RT O2S voltage. If voltage is more than 0.2 volt, go to next step. If voltage is less than 0.2 volt, replace RT O2S. Perform TEST VER-2.
8. Disconnect jumper wire. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of RT O2S signal circuit (Black/Dark Green wire) between RT O2S connector harness side and PCM connector terminal No. 41. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Black/Dark Green wire. Perform TEST VER-2.

TEST TC-10A - O2S STAYS ABOVE CENTER (RICH) OR LEFT O2S STAYS ABOVE CENTER (RICH) (DTC 52)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM.
2. With engine speed still set at 1500 RPM, read O2S voltage. If O2S voltage is always more than 0.5 volt, a condition causing engine to run rich is indicated. Perform TEST NTC-1A. If O2S voltage is not always more than 0.5 volt, condition required to set code is not present at this time. Go to next step.
3. O2S STAYS ABOVE CENTER (RICH) trouble code sets if O2S output voltage stays at more than 0.5 volt, but less than 1.2 volts, for at least 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or mechanical engine problem. Perform TEST NTC-1A.

TEST TC-11A - RIGHT O2S STAYS ABOVE CENTER (RICH) (DTC 52)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM. Go to next step.
2. Using scan tool, read RT O2S sensor voltage. Snap throttle several times while monitoring scan tool. If RT O2S voltage is not always more than 0.5 volt, condition required to set trouble code is not present at this time. Go to next step. If RT O2S voltage is always more than 0.5 volt, go to step 4).
3. RIGHT O2S STAYS ABOVE CENTER (RICH) trouble code sets if RT O2S output voltage stays at more than 0.5 volt, but less than 1.2 volts without switching for 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or mechanical engine problem. Go to TEST NTC-1A.
4. If LEFT O2S STAYS ABOVE CENTER (RICH) trouble code is not also set, replace leaking injector for right intake manifold bank. Perform TEST VER-2. If LEFT O2S STAYS ABOVE CENTER (RICH) trouble code is also set, a condition causing engine to run rich in all cylinders is indicated. Go to TEST NTC-1A.

TEST TC-12A - O2S STAYS BELOW CENTER (LEAN) OR LEFT O2S STAYS BELOW CENTER (LEAN) (DTC 51)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run until normal operating temperature is reached.
2. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read O2S voltage. If O2S voltage is not always less than 0.5 volt, condition required to set trouble code is not present at this time. Go to next step. If O2S voltage is always less than 0.5 volt, a condition causing engine to run lean in all cylinders is indicated. Go to TEST NTC-1A.
3. O2S STAYS BELOW CENTER (LEAN) trouble code sets if O2S output voltage stays at less than 0.5 volt without switching for 8 minutes. Possible causes are: major vacuum leak, low fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or mechanical engine problem. Go to TEST NTC-1A.

TEST TC-13A - RIGHT O2S STAYS BELOW CENTER (LEAN) (DTC 51)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM. Go to next step.
2. Using scan tool, read RT O2S voltage. Snap throttle open several times while monitoring scan tool. If RT O2S voltage is not always less than 0.5 volt, condition required to set trouble code is not present at this time. Go to next step. If voltage is always less than 0.5 volt, go to step 4).
3. RIGHT O2S STAYS BELOW CENTER (LEAN) trouble code sets if RT O2S output voltage stays less than 0.5 volt without switching for more than 8 minutes. Possible causes are: large vacuum leak, low fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or mechanical engine problem. Go to TEST NTC-1A.
4. If LEFT O2S STAYS BELOW CENTER (LEAN) message is not also set, a possible cause could be a shorted injector control circuit or a restricted injector. Go to TEST NTC-1A. If LEFT O2S STAYS BELOW CENTER (LEAN) trouble code is also set, a condition causing engine to run lean in all cylinders is indicated. Go to TEST NTC-1A.

TEST TC-14A - LEFT O2S SHORTED TO VOLTAGE (DTC 21)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Allow engine to run for one minute. Using scan tool, read LT O2S voltage. If LT O2S voltage is less than 1.5 volts, go to next step. If LT O2S is more than 1.5 volts, go to step 5).
2. Wiggle LT O2S connector and wiring harness while watching scan tool display. If LT O2S voltage goes to more than 1.5 volts at any time, repair wiring and connectors as necessary. Perform TEST VER-2. If voltage does not go to more than 1.5 volts at any time, condition required to set trouble code is not present at this time. Go to next step.
3. LEFT O2S SHORTED TO VOLTAGE trouble code sets if LT O2S signal circuit voltage is 1.5-4.8 volts for 1.5 minutes after engine is running for 2 minutes with engine temperature more than 176°F (80°C). Possible causes are: LT O2S failure, LT O2S signal circuit (Tan/White wire) shorted to another circuit, or dirty/wet LT O2S connector causing voltage tracking. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring or connectors as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Test is complete. Perform TEST VER-2.
5. Turn ignition off. Disconnect LT O2S connector. Disconnect Powertrain Control Module (PCM) connector. Turn ignition on with engine off. Using scan tool in voltmeter mode, check voltage of LT O2S signal circuit (Tan/White wire) on LT O2S connector harness side. If voltage is less than one volt, replace LT O2S. Perform TEST VER-2. If voltage is more than one volt, repair short to voltage in Tan/White wire. Perform TEST VER-2.

TEST TC-15A - RIGHT O2S SHORTED TO VOLTAGE (DTC 21)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Start engine. Using scan tool, read RT O2S voltage. If RT O2S voltage is less than 1.5 volts, go to next step. If RT O2S is more than 1.5 volts, go to step 5).
2. Wiggle RT O2S connector and wiring harness while watching scan tool display. If RT O2S voltage goes to more than 1.5 volts at any time, repair wiring and/or connectors for an intermittent short to voltage. Perform TEST VER-2. If voltage does not go to more than 1.5 volts at any time, condition required to set trouble code is not present at this time. Go to next step.
3. RIGHT O2S SHORTED TO VOLTAGE trouble code sets if RT O2S signal circuit voltage is 1.5-4.8 volts for 1.5 minutes after engine is running for 2 minutes with engine temperature more than 176°F (80°C). Possible causes are: RT O2S failure, RT O2S signal circuit (Black/Dark Green wire) shorted to another circuit, or dirty/wet RT O2S connector causing voltage tracking. Go to next step.
4. Inspect all related wiring and connectors. Repair wiring or connectors as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Test is complete. Perform TEST VER-2.
5. Turn ignition off. Disconnect RT O2S connector. Disconnect Powertrain Control Module (PCM) connector. Turn ignition on with engine off. Using scan tool in voltmeter mode, check voltage of RT O2S signal circuit (Black/Dark Green wire) on RT O2S connector harness side. If voltage is less than one volt, replace RT O2S. Perform TEST VER-2. If voltage is more than one volt, repair short to voltage in Black/Dark Green wire. Perform TEST VER-2.

TEST TC-16A - LEFT OR RIGHT IDLE ADAPTIVE MEM AT LEAN OR RICH LIMIT (DTC 52 or 51)

These trouble codes may set for several reasons not related to Powertrain Control Module (PCM) electronics. Idle adaptive memory is designed to aid in air/fuel control. Its function is to adapt air/fuel mixture to correct for fuel pressure differences and mechanical changes such as engine wear and mechanical malfunctions.

These trouble codes affect following systems

1. Dual O2S System

PCM reaches its operating limit when one O2S indicates a continuous lean or rich exhaust gas mixture. O2S responsible is disabled and other O2S takes over. If both sensors are indicating excessive lean or rich readings, fuel control system goes into open loop mode.

1. Single O2S System

Fuel control system goes into open loop when O2S indicates a continuous lean or rich exhaust gas mixture.

Following definitions apply to RIGHT (or LEFT) IDLE ADAPTIVE MEM AT LEAN (or RICH) message

1. RIGHT (Or LEFT) IDLE ADAPTIVE MEM AT LEAN PCM tries to adapt air/fuel mixture richer.
2. RIGHT (Or LEFT) IDLE ADAPTIVE MEM AT RICH PCM tries to adapt air/fuel mixture leaner. Possible causes of RIGHT (or LEFT) IDLE ADAPTIVE MEM AT LEAN (or RICH) message are
3. Ignition coil and secondary wires.
4. Catalyst.
5. EGR valve assembly.
6. MAP sensor.
7. Fuel pump and filter.
8. Fuel injectors.
9. O2S.
10. Fuel pressure regulator.
11. Exhaust system.
12. Wiring harness/connectors.
13. Excessive engine wear.
14. Engine mechanical malfunctions.

Perform following tests in order given until problem is found

1. Fuel pressure, perform TEST NTC-3A.
2. Ignition system, perform TEST NTC-2A.
3. Coolant Temperature Sensor (CTS), perform TEST NTC-4A.
4. MAP sensor, perform TEST NTC-6A.
5. EGR system, perform TEST NTC-13A.
6. O2S switching, perform TEST NTC-7A.
7. Engine mechanical, perform TEST NTC-16A.

TEST TC-17A - ECT SENSOR VOLTAGE TOO LOW (DTC 22)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is less than 0.5 volt, go to step 4). If voltage is more than 0.5 volt, wiggle wiring harness from ECT sensor to Powertrain Control Module (PCM) while observing scan tool. If voltage changes, repair wiring harness or connector as necessary. Perform TEST VER-2.
2. If voltage does not change, condition required to set trouble code is not present at this time. ECT SENSOR VOLTAGE TOO LOW trouble code sets if ECT sensor signal circuit (Tan/Black wire) is less than 0.5 volt for more than 3 seconds. Possible causes are: short to ground in ECT sensor signal circuit (Tan/Black wire), ECT sensor shorted internally or PCM failure. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
4. Disconnect ECT sensor connector. Using scan tool, read ECT sensor voltage. If voltage is more than 4 volts, replace ECT sensor. Perform TEST VER-2. If voltage is less than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
5. Using scan tool in ohmmeter mode, check resistance of ECT sensor connector, signal circuit (Tan/Black wire). If resistance is less than 5 ohms, repair short to ground in Tan/Black wire. Perform TEST VER-2.
6. If resistance is more than 5 ohms, check resistance between ECT sensor connector, signal circuit (Tan/Black wire) and ground circuit (Black/Light Blue wire) using an external ohmmeter. If resistance is less than 5 ohms, repair Tan/Black wire shorted to Black/Light Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-18A - ECT SENSOR VOLTAGE TOO HIGH (DTC 22)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is more than 4.9 volts, go to step 4). If voltage is less than 4.9 volts, wiggle wiring harness from ECT sensor to Powertrain Control Module (PCM) while observing scan tool. If voltage changes, repair wiring harness or connector as necessary. Perform TEST VER-2.
2. If voltage does not change, condition required to set trouble code is not present at this time. ECT SENSOR VOLTAGE TOO HIGH trouble code sets if ECT sensor signal circuit (Tan/Black wire) is more than 4.9 volts for more than 3 seconds. Possible causes are: open ECT sensor signal circuit (Tan/Black wire), ECT sensor open internally, open ECT sensor ground circuit (Black/Light Blue wire) or PCM failure.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
4. Disconnect ECT sensor connector. Connect a jumper wire between signal circuit (Tan/Black wire) and ground circuit (Black/Light Blue wire) on ECT sensor connector. Using scan tool, read ECT sensor voltage.
5. If voltage is less than one volt, replace ECT sensor. Perform TEST VER-2. If voltage is more than one volt, move jumper wire from ECT sensor connector, ground circuit (Black/Light Blue wire), to engine ground.
6. Using scan tool, read ECT sensor voltage. If voltage is less than one volt, repair open Black/Light Blue wire. Perform TEST VER-2. If voltage is more than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
7. Using an external ohmmeter, check resistance of signal circuit (Tan/Black wire) between ECT sensor connector and PCM connector terminal No. 2. If resistance is more than 5 ohms, repair open Tan/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-19A - INTAKE AIR TEMP SENSOR VOLTAGE LOW (DTC 23)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If IAT sensor voltage is less than 0.5 volt, go to step 4). If IAT sensor voltage is more than 0.5 volt, wiggle wiring harness from IAT sensor to Powertrain Control Module (PCM) while observing scan tool. If voltage changes, repair wiring harness or connector as necessary.
2. If voltage does not change, condition required to set trouble code is not present at this time. INTAKE AIR TEMP SENSOR VOLTAGE LOW trouble code sets if IAT sensor signal circuit (Black/Red wire) is less than 0.5 volt. Possible causes are: short to ground in IAT signal circuit (Black/Red wire) or IAT sensor shorted internally. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
4. Disconnect IAT sensor connector. Using scan tool, read IAT sensor voltage. If voltage is more than 4 volts, replace IAT sensor. Perform TEST VER-2. If voltage is less than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
5. Using an external ohmmeter, check resistance between IAT sensor connector, signal circuit (Black/Red wire) and ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair Black/Red wire shorted to Black/Light Blue wire. Perform TEST VER-2.
6. If resistance is more than 5 ohms, use scan tool in ohmmeter mode to check resistance of IAT sensor connector, signal circuit (Black/Red wire). If resistance is less than 5 ohms, repair short to ground in Black/Red wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-20A - INTAKE AIR TEMP SENSOR VOLTAGE HIGH (DTC 23)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If IAT sensor voltage is more than 4.5 volts, go to step 4). If IAT sensor voltage is less than 4.5 volts, wiggle wiring harness from IAT sensor to Powertrain Control Module (PCM) while observing scan tool display. If voltage changes, repair wiring harness or connector as necessary.
2. If voltage does not change, condition required to set trouble code is not present at this time. INTAKE AIR TEMP SENSOR VOLTAGE HIGH trouble code sets if IAT sensor signal circuit (Black/Red wire) is more than 4.5 volts. Possible causes are: open IAT sensor signal circuit (Black/Red wire), IAT sensor open internally or open IAT sensor ground circuit (Black/Light Blue wire). Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
4. Disconnect IAT sensor connector. Connect jumper wire between signal circuit (Black/Red wire) and ground circuit (Black/Light Blue wire) on IAT sensor connector. Using scan tool, read IAT sensor voltage. If voltage is less than one volt, replace IAT sensor. Perform TEST VER-2.
5. If voltage is more than one volt, move jumper wire from IAT sensor connector, ground circuit (Black/Light Blue wire), to an engine ground. Using scan tool, read IAT sensor voltage. If voltage is less than one volt, repair open Black/Light Blue wire. If voltage is more than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
6. Using an external ohmmeter, check resistance of signal circuit (Black/Red wire) between IAT sensor connector and PCM connector terminal No. 21. If resistance is more than 5 ohms, repair open Black/Red wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-21A - THROTTLE POSITION SENSOR VOLTAGE LOW (DTC 24)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read Throttle Position (TP) sensor voltage. If TP sensor voltage is less than 0.2 volt, go to step 5). If TP sensor voltage is more than 0.2 volt, slowly open and close throttle while observing scan tool.
2. If voltage change is not smooth, replace TP sensor. Perform TEST VER-2. If voltage change is smooth, wiggle wiring harness from TP sensor to Powertrain Control Module (PCM) while observing scan tool. If voltage changes, repair wiring harness or connector as necessary. Perform TEST VER-2.
3. If voltage does not change, condition required to set trouble code is not present at this time. THROTTLE POSITION SENSOR VOLTAGE LOW trouble code sets if TP sensor signal circuit (Orange/Dark Blue wire) is less than 0.2 volt for .704 seconds or if vehicle speed is more than 20 MPH, engine speed is more than 1500 RPM and vacuum is less than 2 in. Hg with TP sensor signal circuit (Orange/Dark Blue wire) less than 0.5 volt. Possible causes are: short to ground in TP sensor signal circuit (Orange/Dark Blue wire), TP sensor failure or open TP sensor 5-volt supply circuit (Violet/White wire). Go to next step.
4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, condition required to set trouble code is not present at this time. Perform TEST VER-2.
5. Disconnect TP sensor connector. Using scan tool, read TP sensor voltage. If voltage is more than one volt, replace TP sensor. Perform TEST VER-2. If voltage is less than one volt, go to next step.
6. Using scan tool, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is less than 4 volts, repair open Violet/White wire. Perform TEST VER-2.
7. If voltage is more than 4 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of TP sensor connector, signal circuit (Orange/Dark Blue wire). If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Orange/Dark Blue wire. Perform TEST VER-2.

TEST TC-22A - THROTTLE POSITION SENSOR VOLTAGE HIGH (DTC 24)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read Throttle Position (TP) sensor voltage. If voltage is more than 4.5 volts, go to step 5). If TP sensor voltage is less than 4.5 volts, slowly open and close throttle while observing scan tool.
2. If voltage change is not smooth, replace TP sensor. Perform TEST VER-2. If voltage change is smooth, wiggle wiring harness from TP sensor to Powertrain Control Module (PCM) while observing scan tool. If voltage changes, repair wiring harness or connector as necessary. Perform TEST VER-2.
3. If voltage does not change, condition required to set trouble code is not present at this time. THROTTLE POSITION SENSOR VOLTAGE HIGH trouble code sets if TP sensor signal circuit (Orange/Dark Blue wire) is more than 4.5 volts for .704 seconds. Possible causes are: open TP sensor signal circuit (Orange/Dark Blue wire), open TP sensor ground circuit (Black/Light Blue wire) or TP sensor failure. Go to next step.
4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, condition required to set trouble code is not present at this time. Perform TEST VER-2.
5. Disconnect TP sensor connector. Connect a jumper wire between TP sensor signal circuit (Orange/Dark Blue wire) and TP sensor ground circuit (Black/Light Blue wire) on TP sensor connector. Using scan tool, read TP sensor voltage. If scan tool displays NO RESPONSE, repair Orange/Dark Blue wire shorted to Violet/White wire. Perform TEST VER-2. If scan tool does not display NO RESPONSE, go to next step.
6. If voltage is less than one volt, replace TP sensor. Perform TEST VER-2. If voltage is more than one volt, move jumper wire from TP sensor connector, ground circuit (Black/Light Blue wire), to an engine ground. Using scan tool, read TP sensor voltage.
7. If voltage is less than one volt, repair open Black/Light Blue wire. Perform TEST VER-2. If voltage is more than one volt, turn ignition off. Disconnect Powertrain Control Module (PCM) connector.
8. Using an external ohmmeter, check resistance of TP sensor signal circuit (Orange/Dark Blue wire) between TP sensor connector and PCM connector terminal No. 22. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Orange/Dark Blue wire. Perform TEST VER-2.

TEST TC-23A - IDLE AIR CONTROL MOTOR CIRCUITS (DTC 25)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition on with engine off. Start engine. Allow engine to idle for 20 seconds. Using scan tool, actuate Idle Air Control (IAC) motor to 1400 RPM. If tachometer does not read 1300-1500 RPM, go to step 6).
2. If tachometer reads 1300-1500 RPM, use scan tool to actuate IAC motor to 900 RPM. If tachometer does not read 800-1000 RPM, go to step 6). If tachometer reads 800-1000 RPM, condition required to set trouble code is not present at this time. Go to next step. NOTE: PCM cannot detect an open IAC driver circuit or a stuck IAC motor.
3. IDLE AIR CONTROL MOTOR CIRCUITS trouble code sets if any of 4 Idle Air Control (IAC) motor wires is shorted to ground or battery voltage for 2.75 seconds while IAC motor is active. Possible causes are: IAC driver circuit shorted to ground, IAC driver circuit shorted to voltage, IAC driver circuits shorted together, failed PCM or IAC motor internally shorted. Go to next step.
4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, actuate IAC wiggle test. Idle speed should increase and decrease in relation to scan tool display. If engine speed does not change as specified, go to step 6).
5. If engine speed changes as specified, wiggle wiring harness from IAC motor to Powertrain Control Module (PCM) while observing IAC motor operation. If IAC motor stops operating at any time, repair wiring harness as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see the «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
6. Turn ignition off. Disconnect Idle Air Control (IAC) motor connector. Inspect IAC motor connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
7. Using scan tool, check resistance of all wires on IAC motor connector. If resistance for any wire is less than 5 ohms, repair appropriate wire for a short to ground. Perform TEST VER-2. NOTE: Voltage may switch or remain constant during step 8).
8. If resistance for all wires is more than 5 ohms, use scan tool to actuate IAC motor. Using scan tool in voltmeter mode, check voltage on each IAC motor connector wire. If voltage for any wire is less than 5 volts at any time, go to appropriate test. See IAC DRIVER TEST table. If voltage for all wires is more than 5 volts at any time, go to next step. IAC DRIVER TEST Driver No. Wire Color Go To 1 Brown/White «TEST TC-23B»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-23b-iac-driver-1) 2 Yellow/Black «TEST TC-23C»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-23c-iac-driver-2) 3 Gray/Red «TEST TC-23D»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-23d-iac-driver-3) 4 Violet/Black «TEST TC-23E»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-23e-iac-driver-4)
9. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check and record resistance readings between following driver circuits. See IAC DRIVER CIRCUIT IDENTIFICATION table: IAC driver circuit No. 1 and circuits No. 2, 3 and 4. IAC driver circuit No. 2 and circuits No. 3 and 4. IAC driver circuit No. 3 and circuit No. 4. IAC DRIVER CIRCUIT IDENTIFICATION Driver No. Wire Color 1 Brown/White 2 Yellow/Black 3 Gray/Red 4 Violet/Black
10. If resistance between any 2 wires is less than 5 ohms, repair those 2 wires for shorting together. Perform TEST VER-2. If resistance between all pairs of wires is more than 5 ohms, replace IAC motor. Perform TEST VER-2.

TEST TC-23B - IAC DRIVER #1 CONTROL CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
2. Using an external ohmmeter, check resistance of Idle Air Control (IAC) motor driver No. 1 circuit (Brown/White wire) between IAC motor connector and PCM terminal No. 40. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Brown/White wire. Perform TEST VER-2.

TEST TC-23C - IAC DRIVER #2 CONTROL CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
2. Using an external ohmmeter, check resistance of Idle Air Control (IAC) motor driver No. 2 circuit (Yellow/Black wire) between IAC motor connector and PCM terminal No. 60. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Yellow/Black wire or Violet/Black wire. Perform TEST VER-2.

TEST TC-23D - IAC DRIVER #3 CONTROL CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
2. Using an external ohmmeter, check resistance of Idle Air Control (IAC) motor driver No. 3 circuit (Gray/Red wire) between IAC motor connector and PCM terminal No. 39. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Gray/Red wire or Yellow/Black wire. Perform TEST VER-2.

TEST TC-23E - IAC DRIVER #4 CONTROL CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
2. Using an external ohmmeter, check resistance of Idle Air Control (IAC) motor driver No. 4 circuit (Violet/Black wire) between IAC motor connector and PCM terminal No. 59. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Violet/Black wire or Gray/Red wire. Perform TEST VER-2.

TEST TC-24A - INJECTOR CONTROL CIRCUITS (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
2. Using scan tool, read trouble codes. If engine starts, allow engine to idle for at least 20 seconds. If scan tool does not display INJECTOR CONTROL CIRCUIT, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays INJECTOR CONTROL CIRCUIT, go to appropriate test. See INJECTOR TROUBLE CODES table. INJECTOR TROUBLE CODES Trouble Code Go To INJECTOR #1 CONTROL CIRCUIT «TC-24B»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-24b-injector-1-control) INJECTOR #2 CONTROL CIRCUIT «TC-25A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-25a-injector-2-control) INJECTOR #3 CONTROL CIRCUIT «TC-26A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-26a-injector-3-control) INJECTOR #4 CONTROL CIRCUIT «TC-27A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-27a-injector-4-control) INJECTOR #5 CONTROL CIRCUIT «TC-28A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-28a-injector-5-control) INJECTOR #6 CONTROL CIRCUIT «TC-29A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-29a-injector-6-control) INJECTOR #7 CONTROL CIRCUIT «TC-30A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-30a-injector-7-control) INJECTOR #8 CONTROL CIRCUIT «TC-31A»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__test-tc-31a-injector-8-control)
3. INJECTOR CONTROL CIRCUIT trouble code sets if Powertrain Control Module (PCM) does not detect an inductive kick .18ms after injector turn-off with no other injectors on. Battery voltage must be more than 12 volts, ASD relay energized, injector pulse width less than 10ms with engine speed less than 3000 RPM. Possible causes are: open or shorted injector control circuit, open injector power supply circuit, open injector or failed PCM. Go to next step.
4. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
5. Start engine. Wiggle wiring harness from injectors to PCM. If engine misfires or stalls, repair wiring harness as necessary. Perform TEST VER-2. If engine does not misfire or stall, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.

TEST TC-24B - INJECTOR #1 CONTROL CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 1 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 1. Using scan tool in voltmeter mode, check voltage on injector No. 1 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 1 driver circuit (White/Dark Blue wire) between injector connector (harness side) and PCM connector terminal No. 16. If resistance is more than 5 ohms, repair open White/Dark Blue wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM terminal No. 16 (White/Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in White/Dark Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-25A - INJECTOR #2 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 2 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 2. Using scan tool in voltmeter mode, check voltage on injector No. 2 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 2 driver circuit (Tan wire) between injector connector (harness side) and PCM connector terminal No. 15. If resistance is more than 5 ohms, repair open Tan wire. Perform TEST VER-1.
4. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM terminal No. 15 (Tan wire). If resistance is less than 5 ohms, repair short to ground in Tan wire. Perform TEST VER-1. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-1.

TEST TC-26A - INJECTOR #3 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 3 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 3. Using scan tool in voltmeter mode, check voltage on injector No. 3 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 3 driver circuit (Yellow/White wire) between injector connector (harness side) and PCM connector terminal No. 14. If resistance is more than 5 ohms, repair open Yellow/White wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, check resistance of PCM terminal No. 14 (Yellow/White wire) using scan tool in ohmmeter mode. If resistance is less than 5 ohms, repair short to ground in Yellow/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-27A - INJECTOR #4 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 4 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 4. Using scan tool in voltmeter mode, check voltage on injector No. 4 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 4 driver circuit (Light Blue/Brown wire) between injector connector (harness side) and PCM connector terminal No. 13. If resistance is more than 5 ohms, repair open Light Blue/Brown wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM terminal No. 13 (Light Blue/Brown wire). If resistance is less than 5 ohms, repair short to ground in Light Blue/Brown wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-28A - INJECTOR #5 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 5 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 5. Using scan tool in voltmeter mode, check voltage on injector No. 5 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 5 driver circuit (Pink/Black wire on AB and AN bodies; Gray wire on BR body) between injector connector (harness side) and PCM connector terminal No. 38. If resistance is more than 5 ohms, repair open Pink/Black wire or Gray wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM terminal No. 38 (Pink/Black wire on AB and AN bodies; Gray wire on BR body). If resistance is less than 5 ohms, repair short to ground in Pink/Black wire or Gray wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-29A - INJECTOR #6 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 6 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 6. Using scan tool in voltmeter mode, check voltage on injector No. 6 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 6 driver circuit (Light Green/Black wire on AB and AN bodies; Brown/Dark Blue wire on BR body) between injector connector (harness side) and PCM connector terminal No. 58. If resistance is more than 5 ohms, repair open Light Green/Black wire, Brown/Dark Blue wire or Brown/Yellow wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM terminal No. 58 (Light Green/Black wire on AB and AN bodies; Brown/Dark Blue wire on BR Body). If resistance is less than 5 ohms, repair short to ground in Light Green/Black wire, Brown/Dark Blue wire or Brown/Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-30A - INJECTOR #7 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 7 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 7. Using scan tool in voltmeter mode, check voltage on injector No. 7 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 7 driver circuit (Dark Blue/Tan wire) between injector connector (harness side) and PCM connector terminal No. 17. If resistance is more than 5 ohms, repair open Dark Blue/Tan wire or Dark Blue/White wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM terminal No. 17 (Dark Blue/Tan wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Tan or Dark Blue/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-31A - INJECTOR #8 CONTROL CIRCUIT (DTC 27)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect injector No. 8 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 10-16 ohms, replace injector. Perform TEST VER-2. If resistance is 10-16 ohms, turn ignition on.
2. Using scan tool, actuate injector No. 8. Using scan tool in voltmeter mode, check voltage on injector No. 8 connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
3. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of injector No. 8 driver circuit (Dark Blue/Gray wire on AB and AN bodies; Red/Yellow wire on BR body) between injector connector (harness side) and PCM connector terminal No. 18. If resistance is more than 5 ohms, repair open Dark Blue/Gray wire, Red/Yellow wire, or Dark Blue/Yellow wire. Perform TEST VER-2.
4. If resistance is less than 5 ohms, check resistance of PCM terminal No. 18 (Dark Blue/Gray wire on AB and AN bodies; Red/Yellow wire on BR body) using scan tool in ohmmeter mode. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Gray wire, Red/Yellow wire or Dark Blue/Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-32A - EGR SYSTEM FAILURE (DTC 32)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Inspect condition and proper routing of all EGR system vacuum hoses. If EGR system vacuum hoses are okay, go to next step. If EGR system vacuum hoses are damaged or misrouted, repair as necessary. Perform TEST VER-2.
2. Start engine. Allow engine to idle for at least 2 minutes. Disconnect Exhaust Gas Recirculation (EGR) solenoid electrical connector. Leave EGR solenoid electrical connector disconnected for remainder of test. Disconnect vacuum supply hose from EGR solenoid.
3. Connect a vacuum gauge to end of disconnected hose. If vacuum gauge indicates less than 10 in. Hg, repair vacuum supply to EGR solenoid. Perform TEST VER-2.
4. If vacuum gauge indicates more than 10 in. Hg, reconnect vacuum hose to EGR solenoid. Disconnect vacuum hose from EGR valve. Connect a vacuum gauge to end of disconnected hose. While observing vacuum gauge, momentarily raise engine speed to more than 2000 RPM.
5. If vacuum gauge indicates less than 5 in. Hg while throttle is open, replace EGR valve assembly. Perform TEST VER-2. If vacuum gauge indicates more than 5 in. Hg while throttle is open, remove vacuum gauge.
6. Connect a vacuum pump to EGR valve. With engine idling, slowly apply vacuum to EGR valve. If engine idle becomes rough as vacuum is applied, go to next step. If engine idle does not become rough, remove EGR valve and inspect manifold and EGR backpressure tube for restrictions. If restrictions are present, clean as necessary. Perform TEST VER-2. If no restrictions are present, replace EGR valve assembly. Perform TEST VER-2.
7. Turn ignition off. Apply 10 in. Hg vacuum to EGR valve. Observe Vacuum gauge. If vacuum was not held for at least 10 seconds, replace EGR valve assembly. Perform TEST VER-2.
8. If vacuum was held for at least 10 seconds, condition required to set trouble code is not present at this time. EGR SYSTEM FAILURE trouble code sets when Powertrain Control Module (PCM) performs a test of EGR system and does not see a significant change in oxygen sensor signal. Possible causes are: open or blocked vacuum supply to EGR valve, blocked exhaust transfer tubes to intake manifold, blocked backpressure tube to transducer, failed EGR valve, failed EGR solenoid/transducer or failed PCM. Go to next step.
9. Inspect all related vacuum hoses and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with vacuum hoses and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.

TEST TC-33A - EGR SOLENOID CIRCUIT (DTC 32)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes and actuate EGR solenoid. Using scan tool, read trouble codes. If scan tool does not display EGR SOLENOID CIRCUIT, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays EGR SOLENOID CIRCUIT, go to step 5).
2. EGR SOLENOID CIRCUIT trouble code sets if EGR solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted EGR solenoid, open EGR solenoid power supply circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body), open or shorted EGR solenoid ground circuit (Gray/Yellow wire) or failed PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
4. Using scan tool, read trouble codes. EGR actuation test should still be running. Wiggle wiring harness from EGR solenoid to PCM. If EGR SOLENOID CIRCUIT trouble code returns, repair wiring harness as necessary. Perform TEST VER-2. If EGR SOLENOID CIRCUIT trouble code does not return, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
5. Turn ignition off. Disconnect EGR solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on EGR solenoid connector, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue wire. Perform TEST VER-2.
6. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using external ohmmeter, check resistance of ground circuit (Gray/Yellow wire) between EGR solenoid connector and PCM connector terminal No. 35. If resistance is more than 5 ohms, repair open Gray/Yellow wire. Perform TEST VER-2.
7. If resistance is less than 5 ohms, use scan tool in ohmmeter mode to check resistance of PCM connector terminal No. 35 (Gray/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Gray/Yellow wire. Perform TEST VER-2.
8. If resistance is more than 5 ohms, reconnect EGR solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 35 (Gray/Yellow wire). If voltage is less than 10 volts, replace EGR solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.

TEST TC-34A - EVAP SOLENOID CIRCUIT (DTC 31)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes and actuate Evaporative (EVAP) solenoid. Using scan tool, read trouble codes. If scan tool does not display EVAP SOLENOID CONTROL CIRCUIT, condition required to set trouble code is not present at this time. Go to next step. If scan tool displays EVAP SOLENOID CONTROL CIRCUIT, go to step 5).
2. EVAP SOLENOID CONTROL CIRCUIT trouble code sets if EVAP solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or shorted EVAP solenoid, open EVAP solenoid power supply circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body), open or shorted EVAP solenoid control circuit (Pink/Black wire) or failed PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
4. Using scan tool, read trouble codes. EVAP solenoid actuation test should still be running. Wiggle wiring harness from EVAP solenoid to PCM. If EVAP SOLENOID CONTROL CIRCUIT trouble code returns, repair wiring harness. Perform TEST VER-2. If EVAP SOLENOID CONTROL CIRCUIT trouble code does not return, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
5. Turn ignition off. Disconnect EVAP solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on EVAP solenoid connector, power supply circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue wire. Perform TEST VER-2.
6. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of EVAP solenoid control circuit (Pink/Black wire) between EVAP solenoid connector and PCM connector terminal No. 52. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open in Pink/Black wire. Perform TEST VER-2.
7. Put scan tool in ohmmeter mode. Using scan tool, check resistance on PCM connector terminal No. 52 (Pink/Black wire). If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, repair short to ground in Pink/Black wire. Perform TEST VER-2.
8. Reconnect EVAP solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 52 (Pink/Black wire). If voltage is less than 10 volts, replace EVAP solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.

TEST TC-35A - TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT (DTC 37)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes. On models with overdrive switch on instrument panel, go to TEST TC-35B. On models without overdrive switch on instrument panel, use scan tool to actuate Torque Converter Clutch (TCC) relay. If TCC relay does not click, go to step 5). If TCC relay clicks, condition required to set trouble code is not present at this time. Go to next step.
2. TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT trouble code sets if an open or short is detected in solenoid control circuit (Orange/Black wire). Possible causes are: open or shorted solenoid or relay control circuit (Orange/Black wire), open or shorted solenoid or relay coil, or open fused ignition switch output circuit (Dark Blue wire) to solenoid or relay. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring or connectors, go to next step.
4. Using scan tool, read trouble codes. TCC actuation test should still be running. Wiggle wiring harness from TCC solenoid relay to PCM. If TCC RELAY CONTROL CIRCUIT trouble code returns, repair wiring harness as necessary. Perform TEST VER-2. If TCC RELAY CONTROL CIRCUIT trouble code does not return, test is complete. Perform TEST VER-2.
5. Disconnect TCC relay connector. Using scan tool in voltmeter mode, check voltage on TCC solenoid connector terminal "A", fused ignition switch output circuit (Dark Blue wire).
6. If voltage is less than 10 volts, repair open Dark Blue wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 54, TCC solenoid control circuit (Orange/Black wire).
7. If resistance is less than 5 ohms, repair short to ground in Orange/Black wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
8. Using an external ohmmeter, check resistance of TCC solenoid control circuit (Orange/Black wire) between PCM connector terminal No. 54 and TCC solenoid connector. If resistance is more than 5 ohms, repair open Orange/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, reconnect TCC solenoid connector. Turn ignition on.
9. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 54, TCC solenoid control circuit (Orange/Black wire). If voltage is more than 10 volts, replace PCM. Perform TEST VER-2. If resistance is less than 10 volts, replace TCC relay. Perform TEST VER-2.

TEST TC-35B - TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, actuate Torque Converter Clutch (TCC) solenoid. Wait 10 seconds. Using scan tool, read trouble codes. If TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT trouble code does not return, go to next step. If TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT trouble code returns, go to step 4).
2. TCC actuation test should still be running. Wiggle wiring harness from TCC solenoid relay to PCM. Using scan tool, read trouble codes. If TCC RELAY CONTROL CIRCUIT trouble code returns, repair wiring harness as necessary. Perform TEST VER-2. If TCC RELAY CONTROL CIRCUIT trouble code does not return, condition required to set trouble code is not present at this time.
3. TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT trouble code sets if an open or short is detected in TCC solenoid control circuit. Possible causes are: open or shorted TCC solenoid control circuit (Orange/Black wire) open or shorted TCC solenoid coil, or open fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body) to solenoid. Test is complete. Perform TEST VER-2.
4. Disconnect TCC solenoid connector. Using scan tool in voltmeter mode, check voltage on TCC solenoid connector, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair Dark Blue wire, Light Green/Black wire or Light Blue wire as necessary. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
5. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 54, TCC solenoid control circuit (Orange/Black wire). If resistance is less than 5 ohms, repair short to ground in Orange/Black wire or Violet/Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
6. Using an external ohmmeter, check resistance of TCC solenoid control circuit (Orange/Black wire) between PCM connector terminal No. 54 and TCC solenoid connector. If resistance is more than 5 ohms, repair open Orange/Black wire or Violet/Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, reconnect transmission solenoid connector. Turn ignition on.
7. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 54, TCC solenoid control circuit (Orange/Black wire). If voltage is more than 10 volts, replace PCM. Perform TEST VER-2. If resistance is less than 10 volts, replace TCC solenoid. Perform TEST VER-2.

TEST TC-36A - TRANS OVERDRIVE SOLENOID CIRCUIT (DTC 45)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes and actuate Overdrive (OD) solenoid. Wait 10 seconds. Using scan tool, read trouble codes. If TRANS OVERDRIVE SOLENOID CIRCUIT trouble code does not return, go to next step. If TRANS OVERDRIVE SOLENOID CIRCUIT trouble code returns, go to step 4).
2. OD solenoid actuation test should still be running. While monitoring scan tool, wiggle wiring harness from OD solenoid connector to Powertrain Control Module (PCM). If TRANS OVERDRIVE SOLENOID CIRCUIT trouble code does not return, condition required to set trouble code is not present at this time. Go to next step. If TRANS OVERDRIVE SOLENOID CIRCUIT trouble code returns, go to step 4).
3. TRANS OVERDRIVE SOLENOID CIRCUIT trouble codes sets if OD solenoid is not in its proper state when monitored by PCM. Possible causes are: open or shorted OD solenoid control circuit (Orange/White wire on AB body; Orange/Light Green wire on AN body; Brown wire on BR body), open fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body), open or shorted OD solenoid coil, or failed PCM. Test is complete. Perform TEST VER-2.
4. Disconnect OD solenoid connector. Using scan tool in voltmeter mode, check voltage on OD solenoid connector, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
5. Disconnect Powertrain Control Module (PCM). Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 55, OD solenoid control circuit (Orange/White wire on AB body; Orange/Light Green wire on AN body; Brown wire on BR body). If resistance is less than 5 ohms, repair short to ground in Orange/White wire, Orange/Light Green wire, Brown wire or Brown/Light Green wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
6. Using an external ohmmeter, check resistance of OD solenoid control circuit (Orange/White wire on AB body; Orange/Light Green wire on AN body; Brown wire on BR body) between PCM connector terminal No. 55 and OD solenoid connector. If resistance is more than 5 ohms, repair open Orange/White wire, Orange/Light Green wire, Brown wire or Brown/Light Green wire. Perform TEST VER-2. If resistance is less than 5 ohms, reconnect OD solenoid connector.
7. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 55, OD solenoid control circuit (Orange/White wire on AB body; Orange/Light Green wire on AN body; Brown wire on BR body). If voltage is more than 10 volts, replace PCM. Perform TEST VER-2. If voltage is less than 10 volts, replace OD solenoid. Perform TEST VER-2.

TEST TC-37A - A/C CLUTCH RELAY CIRCUIT (DTC 33)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, actuate A/C clutch relay. If A/C clutch relay is clicking, go to next step. If A/C clutch relay is not clicking, go to step 5).
2. Condition required to set trouble code is not present at this time. A/C CLUTCH RELAY CIRCUIT trouble code sets if A/C clutch relay control circuit (Dark Blue/Orange wire) is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or short in A/C clutch relay coil windings, open or short in A/C clutch relay control circuit (Dark Blue/Orange wire), open or short in A/C clutch relay ignition switch output circuit (Dark Blue wire), or failed driver in PCM. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
4. While still actuating A/C clutch relay, wiggle wiring harness from A/C clutch relay to PCM. If wiggling interrupts A/C clutch relay clicking, repair wiring harness as necessary. Perform TEST VER-2. If wiggling does not interrupt A/C clutch relay clicking, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition). Perform TEST VER-2.
5. Remove A/C clutch relay. Using scan tool in voltmeter mode, check voltage on A/C clutch relay connector, ignition switch output circuit (Dark Blue wire). If voltage is less than 10 volts, repair open Dark Blue wire or Yellow/Dark Green wire. Perform TEST VER-2.
6. If voltage is more than 10 volts, use an external ohmmeter to check resistance across A/C clutch relay terminals. (Scheme 28) If resistance is more than 100 ohms, replace A/C clutch re lay. Perform TEST VER-2. If resistance is less than 100 ohms, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of A/C clutch relay connector, control circuit (Dark Blue/Orange wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire or Dark Blue/Red wire. Perform TEST VER-2.
8. If resistance is more than 5 ohms, check resistance of control circuit (Dark Blue/Orange wire) between A/C clutch relay connector and PCM connector terminal No. 34 using an external ohmmeter. If resistance is more than 5 ohms, repair open Dark Blue/Orange wire or Dark Blue/Red wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

Testing TC-37A Relay (All Models). Scheme 28

TEST TC-38A - AUTO SHUTDOWN RELAY CONTROL CIRCUIT (DTC 42)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, actuate Auto Shutdown (ASD) relay. If ASD relay is not clicking, go to step 5). If ASD relay is clicking, condition required to set trouble code is not present at this time.
2. AUTO SHUTDOWN RELAY CONTROL CIRCUIT trouble code sets if an open or short is detected in ASD relay circuit. Possible causes are: open or short in ASD relay control circuit (Dark Blue/Yellow wire), open or short in ASD relay fused ignition switch output circuit (Dark Blue wire) ASD relay coil open or shorted, inoperative circuit driver in Powertrain Control Module (PCM) or PCM failure. Go to next step.
3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
4. Start engine. Wiggle wiring harness from ASD relay to PCM. If engine stalls while wiggling wiring harness, repair wiring harness as necessary. Perform TEST VER-2. If engine did not stall while wiggling wiring harness, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) in this article.
5. Remove ASD relay. Using scan tool in voltmeter mode, check voltage on ASD relay connector, fused ignition switch output circuit (Dark Blue wire). If voltage is less than 10 volts, repair open Dark Blue wire or Light Blue/Red wire. Perform TEST VER-2.
6. If voltage is more than 10 volts, use an external ohmmeter to check resistance across ASD relay terminals. (Scheme 28) If resistance is more than 100 ohms, replace ASD relay. Perform TEST VER-2. If resistance is less than 100 ohms, go to next step.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 51 (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire or Pink wire. Perform TEST VER-2.
8. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between ASD relay connector and PCM connector terminal No. 51. If resistance is more than 5 ohms, repair open Dark Blue/Yellow wire or Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-39A - NO ASD RELAY OUTPUT VOLTAGE AT PCM (DTC 42)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. If scan tool also displays AUTO SHUTDOWN RELAY CONTROL CIRCUIT, go to TEST TC-38A. If scan tool does not display AUTO SHUTDOWN RELAY CONTROL CIRCUIT, clear trouble codes. Attempt to start engine. Allow engine to idle. If engine starts and NO ASD RELAY OUTPUT VOLTAGE AT PCM trouble code does not reset, go to next step.
2. Condition required to set trouble code is not present at this time. NO ASD RELAY OUTPUT VOLTAGE AT PCM trouble code sets if no voltage is sensed at Powertrain Control Module (PCM) when Auto Shutdown (ASD) relay is energized. Possible causes are: open or short in ASD relay and fuel pump relay control circuits (Dark Blue/Yellow wire), open or short in ASD relay ignition feed circuit (Dark Blue wire), or failed driver in Powertrain Control Module (PCM). Go to next step.
3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, go to next step.
4. While engine is running, wiggle wiring harness from ASD relay to Powertrain Control Module (PCM). Using DRB, read trouble codes. If NO ASD RELAY OUTPUT VOLTAGE AT PCM trouble code returned, repair wiring harness as necessary. Perform TEST VER-2. If NO ASD RELAY OUTPUT VOLTAGE AT PCM trouble code did not return, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
5. Disconnect Auto Shutdown (ASD) relay. Using scan tool in voltmeter mode, check voltage on ASD relay connector, battery feed circuit (Red wire on AB body; Red/White wire on AN body; Gray/White wire on BR body). If voltage is less than 10 volts, repair open in Red wire, Red/White wire or Gray/White wire. Perform TEST VER-2.
6. If voltage is more than 10 volts, install a known-good ASD relay. Attempt to start engine. If engine started, replace ASD relay. Perform TEST VER-2. If engine did not start, turn ignition off.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of ASD relay output circuit (Dark Green/Orange wire) between ASD relay connector and PCM connector terminal No. 57. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire or Dark green/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-40A - TRANS TEMP SENSOR VOLTAGE TOO LOW (DTC 37)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes. Start engine. Allow engine to idle for 30 seconds. Using scan tool, read trouble codes. If scan tool displays TRANS TEMP SENSOR VOLTAGE TOO LOW, go to step 5). If scan tool does not display TRANS TEMP SENSOR VOLTAGE TOO LOW, go to next step.
2. Wiggle wiring harness from transmission temperature sensor to PCM. If wiggling causes TRANS TEMP SENSOR VOLTAGE TOO LOW trouble code to set, repair wiring harness as necessary. Perform TEST VER-2. If wiggling does not cause TRANS TEMP SENSOR TOO LOW trouble to set, condition required to set trouble code is not present at this time.
3. TRANS TEMP SENSOR VOLTAGE TOO LOW trouble code sets if Powertrain Control Module (PCM) sees less than .5 volt at PCM terminal No. 42 (Violet wire) with ignition on. Possible causes are: short in transmission temperature sensor signal circuit (Violet wire), transmission temperature sensor shorted internally shorted or PCM failed. Go to next step.
4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
5. Turn ignition on with engine off. Disconnect transmission temperature sensor connector. Using DRB, read TRANS TEMP SENSOR voltage. If voltage is more than 4 volts, replace transmission temperature sensor. Perform TEST VER-2. If voltage is less than 4 volts, turn ignition off.
6. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using DRB in ohmmeter mode, check resistance of transmission temperature sensor signal circuit (Violet wire). If resistance is less than 5 ohms, repair short to ground in Violet wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-41A - TRANSMISSION TEMPERATURE SENSOR VOLTAGE HIGH (DTC 37)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, erase trouble codes. Start engine. Allow engine to idle for 30 seconds. Using scan tool, read trouble codes. If scan tool displays TRANS TEMP SENSOR VOLTAGE TOO LOW, go to step 5). If scan tool does not display TRANS TEMP SENSOR VOLTAGE TOO LOW, go to next step.
2. Wiggle wiring harness temperature sensor connector and wiring harness while monitoring scan tool display. If scan tool displays TRANS TEMP SENSOR VOLTAGE TOO HIGH trouble code to set, go to step 5). If scan tool does not display TRANS TEMP SENSOR TOO HIGH, go to next step.
3. Condition required to set trouble code is not present at this time. TRANS TEMP SENSOR VOLTAGE TOO HIGH trouble code sets if Powertrain Control Module (PCM) sees less than 4.9 volt at PCM terminal No. 42 (Violet wire) with ignition on. Possible causes are: open in transmission temperature sensor signal circuit (Violet wire), transmission temperature sensor open internally, open sensor ground circuit (Black/Light Blue wire) or PCM failed. Go to next step.
4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, see «INACTIVE TROUBLE CODE CONDITION»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wcodes-39l__inactive-trouble-code-condition) . Perform TEST VER-2.
5. Turn ignition on with engine off. Disconnect transmission temperature sensor connector. With transmission temperature sensor at room temperature, measure resistance across sensor terminals. If resistance is less than 14,000 ohms, go to next step. If resistance is more than 14,000 ohms, replace transmission temperature sensor. Perform TEST VER-2.
6. With scan tool in ohmmeter mode, measure resistance of transmission temperature sensor connector (harness side) ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2.
7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of transmission temperature sensor signal circuit (Violet wire) between transmission temperature sensor connector and PCM terminal No. 42. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open Violet wire. Perform TEST VER-2.

TEST TC-42A - PCM FAILURE SRI MILE NOT STORED OR PCM FAILURE EEPROM WRITE DENIED (DTC 62 OR 63)

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition on. Using scan tool, perform SRI memory test. If DRB displays WRITE FAILURE, replace Powertrain Control Module (PCM). Perform TEST VER-2. If scan tool does not display WRITE FAILURE, go to next step.
2. If scan tool displays WRITE REFUSED, go to step 4). If scan tool does not display WRITE REFUSED, go to next step.
3. If scan tool displays SRI MILEAGE INVALID, update mileage and retest SRI memory. Perform TEST VER-2. If scan tool does not display SRI MILEAGE INVALID, compare SRI mileage stored with instrument panel odometer. If mileage is same, retest SRI memory. Perform TEST VER-2. If mileage is not same, update mileage and retest SRI memory. Perform TEST VER-2.
4. When scan tool displays WRITE REFUSED, PCM is busy. Using scan tool, perform SRI memory test. Retest SRI memory 2 more times if necessary. If scan tool displays WRITE REFUSED, replace PCM. Perform TEST VER-2. If scan tool does not display WRITE REFUSED, vehicle is functioning properly. Perform TEST VER-2.

No Trouble Code Complete Test

Check Tech Service Bulletins (TSBs) for any pertinent information. If a TSB exists, perform corrective action. If TSB does not exist or if driveability problem still exists, perform tests NTC-2A through NTC-15A in sequence until driveability problem is found. See NO TROUBLE CODE TEST MENU table.

NO TROUBLE CODE TEST MENU

No Trouble Code Quick Individual Test

If it is suspected that any item listed in NO TROUBLE CODE TEST MENU table is cause of a vehicle's driveability problem, perform associated test individually. Return to NO TROUBLE CODE TEST MENU table if driveability problem still exists, or perform NO TROUBLE CODE COMPLETE TEST.

No Trouble Code Quick Symptom Test

Symptom checks cannot be used properly unless driveability problem characteristic actually happens while vehicle is being tested. To reduce diagnostic time, ensure that TEST TC-1A is reviewed before attempting to diagnose a symptom.

Select symptom that most accurately describes vehicle's driveability problem and then perform test pertaining to this symptom. Perform each test in sequence until problem is found. See NO TROUBLE CODE QUICK SYMPTOM TEST MENU table.

NO TROUBLE CODE QUICK SYMPTOM TEST MENU

TEST NTC-2A - CHECKING SECONDARY IGNITION & TIMING

1. Turn engine off. Connect engine analyzer to engine. Start engine, and let it idle. If engine will not idle, maintain a constant RPM above idle. Set scope to read display or parade pattern. Follow equipment manufacturer's procedure for pattern analysis.
2. If secondary ignition pattern is not okay, repair indicated component in secondary ignition system. Perform TEST VER-2. If secondary ignition pattern is okay, disconnect any spark plug wire. Observe secondary kilovolt line.
3. If open circuit secondary voltage is not at least 25 kilovolts, replace electronic ignition coil. Perform TEST VER-2. If open circuit secondary voltage is at least 25 kilovolts, reinstall spark plug wire.
4. Ensure engine temperature is more than 180°F (82°C) before proceeding. Using DRB, read total spark advance. Increase engine speed to 2000 RPM. If spark advance does not change with increase in RPM, replace Powertrain Control Module (PCM). Perform TEST VER-2. If spark advance changes with increase in RPM, ignition timing is functioning properly. Test is complete.

TEST NTC-3A - CHECKING FUEL PRESSURE

1. Release fuel pressure. Connect fuel pressure gauge to fuel rail. Turn ignition on. Using DRB, actuate fuel system. If fuel pressure is 34-45 psi (2.5-3.3 kg/cm 2 ), fuel pressure is normal. Test is complete. If fuel pressure is not 34-45 psi (2.5-3.3 kg/cm 2 ), record fuel pressure reading.
2. If pressure is more than 45 psi (3.3 kg/cm 2 ), replace filter/regulator. Perform TEST VER-2. If pressure is more than 45 psi (3.3 kg/cm 2 ). Stop fuel system actuation if pressure is not more than 45 psi (3.3 kg/cm 2 ). Turn ignition off.
3. Inspect fuel lines for kinked or restricted lines. Repair fuel lines as necessary. Perform TEST VER-2. If no kinked or restricted lines exist, replace filter/regulator and primary filter. Perform TEST VER-2.
4. Remove fuel pressure gauge from fuel rail. Install fuel pressure gauge between fuel tank and fuel filter. Turn ignition on. Using DRB, actuate fuel system. If fuel pressure is at least 10 psi (.7 kg/cm 2 ) more than previously recorded pressure, replace fuel filter. Perform TEST VER-2. CAUTION: DO NOT allow fuel pressure to exceed 60 psi (4.2 kg/cm 2 ) when squeezing fuel return hose.
5. If fuel pressure is not at least 10 psi (.7 kg/cm 2 ) more than previous reading, gently squeeze fuel return hose while observing fuel pressure gauge. Ensure fuel pressure does not exceed 60 psi (4.2 kg/cm 2 ). If fuel pressure increases, replace fuel pressure regulator. Perform TEST VER-2. If fuel pressure does not increase, replace fuel pump and sock assembly. Perform TEST VER-2.

TEST NTC-3B - CHECKING FUEL PRESSURE

1. Using DRB, stop fuel system actuation. Release fuel pressure. Ensure fuel tank is at least 1/4 full before performing following test. Install fuel pressure gauge and adapter between fuel tank and filter at rear of vehicle.
2. Remove fuel return line from fuel pump at fuel tank. Connect Fuel Pressure Test Adapter (6541) to fuel return line. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on.
3. Using DRB, actuate fuel system. Observe fuel pressure gauge. If fuel pressure is 34-45 psi (2.5-3.3 kg/cm 2 ), repair fuel return line for a restriction at fuel tank. Perform TEST VER-2.
4. If fuel pressure is not 34-45 psi (2.5-3.3 kg/cm 2 ), stop fuel system actuation. Release fuel pressure. Reconnect fuel return line to fuel tank. Disconnect fuel return line from fuel rail.
5. Attach Fuel Pressure Test Adapter (6541) to fuel return line nipple at fuel rail. Place other end of adapter hose into an approved 2-gallon gasoline can. Turn ignition on. Using DRB, actuate fuel system. Observe fuel pressure gauge.
6. If fuel pressure is 34-45 psi (2.5-3.3 kg/cm 2 ), repair fuel return line for a restriction to fuel tank. Perform TEST VER-2. If fuel pressure is not 34-45 psi (2.5-3.3 kg/cm 2 ), inspect fuel pressure damper line for any restrictions. Replace fuel pressure damper line if necessary. Perform TEST VER-2. If no restrictions exist, replace fuel pressure regulator. Perform TEST VER-2.

TEST NTC-4A - CHECKING COOLANT SENSOR CALIBRATION

1. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If ECT sensor temperature is more than 180°F (82°C), allow engine coolant to cool to 150°F (66°C). Start engine. Allow engine to reach normal operating temperature of more than 180°F (82°C). If ECT sensor value does not increase smoothly, repair cooling system as necessary and replace ECT sensor. Perform TEST VER-2. If ECT sensor value increases smoothly, go to next step.
2. If ECT sensor value did not reach 180°F (82°C) or more, repair cooling system as necessary and replace ECT sensor. Perform TEST VER-2. If ECT sensor value reached 180°F (82°C) or more, system is functioning properly. Test is complete.

TEST NTC-5A - CHECKING TP SENSOR CALIBRATION

1. Turn engine off. Turn ignition on. Using scan tool, read Throttle Position (TP) sensor voltage. Ensure throttle is fully closed and against throttle stop. If voltage is not 1.5 volts or less with throttle closed, replace TP sensor. Perform TEST VER-2.
2. If voltage is 1.5 volts or less with throttle closed, monitor voltage while slowly opening throttle wide open. If voltage change is not smooth, replace TP sensor. Perform TEST VER-2. If voltage change is smooth, go to next step.
3. If maximum voltage is not at least 3.4 volts at wide open throttle, replace TP sensor. Perform TEST VER-2. If maximum voltage is at least 3.4 volts at wide open throttle, TP sensor is functioning properly. Test is complete.

TEST NTC-6A - CHECKING MAP SENSOR CALIBRATION

1. Turn engine off. Install vacuum "T" in Manifold Absolute Pressure (MAP) sensor vacuum hose. Install vacuum gauge. Start engine, and let it idle. If engine will not idle, maintain a constant RPM above idle.
2. Using scan tool, read MAP sensor value. If reading is within one in. Hg of vacuum gauge reading, MAP sensor is functioning properly. Test is complete. If reading is not within one in. Hg of vacuum gauge reading, replace MAP sensor. Perform TEST VER-2.

TEST NTC-7A - CHECKING O2S SWITCHING

1. Allow engine to reach normal operating temperature. Using scan tool, read O2S state. If O2S state is switching, system is functioning properly. Test is complete. If O2S state is not switching, check if O2S is locked on lean. If O2S is locked on lean, go to TEST NTC-7B. If O2S is not locked on lean, turn engine off.
2. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using scan tool, actuate fuel system. Allow fuel pressure to stabilize. Stop fuel system actuation. Monitor fuel gauge for one minute. If fuel pressure drops more than 10 psi (.7 kg/cm 2 ), replace leaking injector(s) or "O" ring(s) as necessary. Perform TEST VER-2.
3. If fuel pressure does not drop more than 10 psi (.7 kg/cm 2 ), inspect air filter and air inlet ducts for restrictions. Clean restricted air inlet system as necessary. Perform TEST VER-2. If no restrictions exist, go to TEST NTC-16A.

TEST NTC-7B - CHECKING O2S SWITCHING

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Allow engine to idle. Inspect engine for vacuum leaks. Repair vacuum leaks as necessary. Perform TEST VER-2. If no vacuum leaks exist, read O2S signal voltage using scan tool.
2. If voltage is more than 0.1 volt, go to step 4). If voltage is less than 0.1 volt, turn ignition off. Disconnect O2S connector. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of O2S connector (harness side), signal circuit (Black/Dark Green wire) bodies.
3. If resistance is less than 5 ohms, repair short to ground in Black/Dark Green wire or Black/Orange wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace O2S. Perform TEST VER-2.
4. Turn engine off. Replace O2S. Turn ignition on. Using scan tool, reset adaptive fuel memory. Start engine. Allow engine to reach normal operating temperature.
5. Using scan tool, read O2S state. If O2S state is switching, repair is complete. Perform TEST VER-2. If O2S state is not switching, go to TEST NTC-16A.

TEST NTC-8B - CHECKING O2S HEATER

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition on. Using scan tool, actuate ASD fuel system. Wait 2 minutes for O2S voltage to stabilize. Using scan tool, read O2S voltage. If voltage is less than 4.8 volts, O2S is functioning properly. Test is complete. If voltage is more than 4.8 volts, go to next step.
2. Disconnect O2S connector. Using scan tool in voltmeter mode, check voltage on O2S connector (harness side), ASD relay output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire or Orange/Dark Blue wire. Perform TEST VER-2.
3. If voltage is more than 10 volts, use scan tool to stop ASD fuel system actuation. Using scan tool in ohmmeter mode, check resistance on O2S connector (harness side), heater ground (Black/White wire). If resistance is more than 5 ohms, repair open Black/White wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace O2S. Perform TEST VER-2.

TEST NTC-9A - CHECKING IDLE AIR CONTROL MOTOR

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, set engine speed to 1100 RPM. If engine speed set at 1050-1150 RPM, Idle Air Control (IAC) motor is operating properly. Test is complete. If engine speed did not set at 1050-1150 RPM, return engine to normal idle speed. Disconnect Idle Air Control (IAC) motor connector.
2. Using scan tool in voltmeter mode, check voltage on IAC motor connector, driver No. 1 circuit (Brown/White wire) while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
3. Using scan tool, check voltage on IAC motor connector, driver No. 2 circuit (Yellow/Black wire) while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
4. Using scan tool, check voltage on IAC motor connector, driver No. 3 circuit (Gray/Red wire) while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
5. Using scan tool, check voltage on IAC motor connector, driver No. 4 circuit (Violet/Black wire) while momentarily opening and closing throttle. If voltage is less than one volt, go to TEST NTC-9B. If voltage is more than one volt, go to next step.
6. Check engine for vacuum leaks. Repair as required. Perform TEST VER-2. If no vacuum leaks are observed, replace IAC motor. Perform TEST VER-2.

TEST NTC-9B - CHECKING IDLE AIR CONTROL MOTOR

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

Turn engine off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of each wire between Idle Air Control (IAC) motor connector and PCM connector. See PCM TERMINAL IDENTIFICATION table. If resistance for any wire is more than 5 ohms, repair open on appropriate wire. Perform TEST VER-2. If resistance for all wires is less than 5 ohms, replace PCM. Perform TEST VER-2.

PCM TERMINAL IDENTIFICATION

TEST NTC-10A - CHECKING SOLENOID OPERATION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, actuate purge solenoid. While touching top of purge solenoid, feel for operation. If purge solenoid does not operate, replace purge solenoid. Perform TEST VER-2.
2. If purge solenoid operates, actuate EGR solenoid. While touching top of EGR solenoid, feel for operation. If EGR solenoid does not operate, replace EGR solenoid. Perform TEST VER-2. If EGR solenoid operates, test is complete.

TEST NTC-11A - CHECKING PARK/NEUTRAL SWITCH

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, read park/neutral switch input state. While watching scan tool display, move gear selector in and out of Park and Reverse. If scan tool displays P/N and D/R, system is functioning properly. Test is complete.
2. If scan tool does not display P/N and D/R, turn ignition off. Place gear selector in Park. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 30, park/neutral switch sense circuit (Brown/Orange wire on AB body; Brown/Yellow wire on AN body; Black/White wire on BR body). Observe scan tool display while moving gear selector in and out of Park and Reverse.
3. If display switches from less than 5 ohms to more than 5 ohms, replace PCM. Perform TEST VER-2. If display does not switch from less than 5 ohms to more than 5 ohms, check if display always stays less than 5 ohms. If display always stays less than 5 ohms, repair short to ground in Brown/Orange wire, Brown/Yellow wire or Black/White wire. Perform TEST VER-2. If display does not always stay less than 5 ohms, go to next step.
4. Disconnect park/neutral switch connector. Using external ohmmeter, check resistance of sense circuit (Brown/Orange wire on AB body; Brown/Yellow wire on AN body; Black/White wire on BR Body) between park/neutral switch connector and PCM connector terminal No. 30. If resistance is less than 10 ohms, replace park/neutral switch. Perform TEST VER-2. If resistance is more than 10 ohms, repair open Brown/Orange wire, Brown/Yellow wire or Black/White wire. Perform TEST VER-2.

TEST NTC-12A - CHECKING PCM GROUNDS & POWER CIRCUITS

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 11, ground circuit (Black/Tan wire). If resistance is more than 5 ohms, repair open Black/Tan wire. Perform TEST VER-2. If resistance is less than 5 ohms, go to next step.
2. Using scan tool, check resistance of PCM connector terminal No. 12, ground circuit (Black/Tan wire). If resistance is more than 5 ohms, repair open Black/Tan wire. Perform TEST VER-2. If resistance is less than 5 ohms, go to next step.
3. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 9, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off. Reconnect PCM connector. PCM grounds and power circuits are okay. Test is complete.

TEST NTC-13A - CHECKING EGR SYSTEM

1. Using scan tool, read module information. If module information indicates vehicle is equipped with California emissions, this test does not apply, however this test can still be performed. Go to next step. If module information indicates vehicle is not equipped with California emissions, go to next step.
2. Inspect condition of EGR hoses and routing. If EGR hoses are damaged or misrouted, repair as necessary. Perform TEST VER-2. If EGR hoses are not damaged or misrouted, go to next step.
3. Disconnect vacuum hose from EGR solenoid. Connect vacuum gauge to disconnected vacuum hose. Start engine. If vacuum is more than 10 in. Hg at idle, go to step 5).
4. If vacuum is less than 10 in. Hg at idle, disconnect EGR vacuum signal hose at intake manifold. Connect a vacuum gauge to intake nipple. Read vacuum gauge at idle. If vacuum is more than 10 in. Hg at idle, repair restriction or leak in vacuum hose to EGR solenoid. Perform TEST VER-2. If vacuum is less than 10 in. Hg at idle, repair plugged vacuum nipple at intake manifold. Perform TEST VER-2.
5. Disconnect vacuum gauge. Reconnect vacuum hose to EGR solenoid. Disconnect vacuum hose from EGR valve. Connect vacuum gauge to disconnected hose. While observing vacuum gauge, momentarily snap throttle open. If vacuum is less than 5 in. Hg at any time, replace EGR valve assembly. Perform TEST VER-2. If vacuum is more than 5 in. Hg at any time, go to next step.
6. Turn ignition off. Disconnect hose to EGR valve backpressure signal tube. Adjust a shop air hose to 20 psi (1.4 kg/cm 2 ). Connect shop air to nipple on base of EGR valve. Listen for a tone change while opening and closing throttle.
7. If tone changes, replace EGR valve. Perform TEST VER-2. If tone does not change, remove vacuum gauge. Cap open nipple at EGR valve base. Connect hand vacuum pump to EGR valve. Listen for engine RPM change while slowly applying vacuum to EGR valve. If engine RPM does not change, replace EGR valve. Perform TEST VER-2.
8. If engine RPM changes, turn ignition off. Apply 10 in. Hg and hold for 30 seconds. If vacuum holds for 30 seconds, EGR system is functioning properly. Test is complete. If vacuum does not hold for 30 seconds, replace EGR valve. Perform TEST VER-2.

TEST NTC-14A - CHECKING ENGINE VACUUM

Connect a vacuum gauge to engine manifold vacuum source. Start engine. Allow engine to idle. Normal vacuum reading will vary depending on altitude. Observe vacuum gauge at idle. If vacuum gauge reading is steady 13-22 in. Hg, engine vacuum is normal. Test is complete. If vacuum gauge reading is not steady 13-22 in. Hg, perform TEST NTC-16A.

TEST NTC-15A - CHECKING MINIMUM IDLE AIR FLOW

1. Turn ignition off. Remove air cleaner. Disconnect PCV valve hose from vacuum nipple. Install Vacuum Fitting (6714) to intake manifold PCV nipple. Disconnect 3/16" evaporative emission hose from either side of throttle body. Cap 3/16" hose nipple on throttle body. Start engine. Allow engine to reach normal operating temperature of more than 180°F (82°C).
2. Using scan tool, actuate minimum idle airflow. Wait for system to stabilize. If engine speed is 500-900 RPM, minimum airflow is normal. Test is complete. If engine speed is not 500-900 RPM, go to next step.
3. Turn engine off. Using an approved cleaner, clean throttle body. Start engine. Using scan tool, actuate minimum airflow. If engine speed is 500-900 RPM, minimum airflow is normal. Test is complete. Perform TEST VER-2. If engine speed is not 500-900 RPM, replace throttle body. Perform TEST VER-2.

TEST NTC-16A - NO TROUBLE CODE MECHANICAL TEST

Note. If coming to this test from O2S test, and rich or lean condition is not corrected after checking items listed below, replace Powertrain Control Module (PCM).

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 distributor position. See CHECKING DISTRIBUTOR POSITION.
2. Check if any Technical Service Bulletins (TSBs) apply to vehicle.
3. Check engine vacuum. It must be at least 13 in. Hg in Neutral.
4. Check valve timing.
5. Check engine compression.
6. Check for exhaust system restriction.
7. Ensure PCV system is functioning properly.
8. Check camshaft and crankshaft sprockets.
9. Check torque converter stall speed.
10. Check power booster for internal vacuum leak.
11. Check for fuel contamination.
12. Ensure injector control circuit is connected to correct fuel injector and injector is not plugged or restricted.

Checking Distributor Position

Note. Adjusting distributor position does not adjust ignition timing. Ignition timing is controlled by Powertrain Control Module (PCM).

Connect scan tool to data link connector. Select SET SYNC. Start engine and observe scan tool display. If distributor is correctly positioned, an IN RANGE message will appear along with 0° (zero degrees). If distributor needs to be adjusted, loosen distributor hold-down bolt. Rotate distributor until reading is as close to 0° (zero degrees) as possible and IN RANGE message is displayed. Tighten distributor hold-down bolt to 17 ft. lbs. (23 N.m).

TEST NS-1A - QUALIFYING NO-START CONDITION

1. Attempt to crank engine. If engine does not crank, go to TEST NS-9A. If engine cranks, turn ignition off. Disconnect spark plug cable at No. 1 spark plug. Insert an insulated screwdriver in spark plug cable terminal. Hold screwdriver within 1/4" of ground. NOTE: When checking for spark, consider one or two sparks as a no spark condition.
2. While cranking engine for 10 seconds, watch for spark. If a good spark occurs, go to TEST NS-2A. If a good spark does not occur, reconnect spark plug cable. Turn ignition off. Disconnect ignition coil secondary cable. Hold coil cable end within 1/4" of ground. While cranking engine for 10 seconds, watch for spark.
3. If good spark occurs, repair secondary ignition system as necessary. Perform TEST VER-1. If a good spark does not occur, turn ignition off. Remove ignition coil secondary cable. Using an external ohmmeter, check resistance of ignition coil secondary cable. If resistance is more than 15 k/ohms, replace ignition coil secondary cable. Perform TEST VER-1.
4. If resistance is less than 15 k/ohms, remove distributor cap. While watching distributor rotor, crank engine. If rotor does not turn, repair distributor drive system. Perform TEST VER-1.
5. If rotor turns, reinstall distributor cap. Reinstall ignition coil secondary cable. Disconnect ignition coil electrical connector. Inspect all terminals. Repair as required. Perform TEST VER-1.
6. If terminals are okay, turn ignition on. Using scan tool, actuate ASD fuel system. Using scan tool in voltmeter mode, check voltage on ignition coil connector, ASD relay output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire or Dark Green/Black wire. Perform TEST VER-1.
7. If voltage is more than 10 volts, check voltage on ignition coil connector, driver circuit (Gray wire on AB and AN bodies; Black/Gray wire on BR body). If voltage is more than 10 volts, go to next step. If voltage is less than 10 volts, go to step 9).
8. Check valve timing. Adjust valve timing as necessary. Perform TEST VER-1. If valve timing is okay, replace ignition coil. Perform TEST VER-1.
9. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 19 (Gray wire on AB and AN bodies; Black/Gray wire on BR body). If resistance is less than 5 ohms, repair short to ground in Gray wire, Black/Gray wire or Gray/White wire. Perform TEST VER-1.
10. If resistance is more than 5 ohms, check resistance of ignition coil driver circuit (Gray wire on AB and AN bodies; Black/Gray wire on BR body) between ignition coil connector and PCM connector terminal No. 19 using an external ohmmeter. If resistance is more than 5 ohms, repair open Gray wire, Black/Gray wire or Gray/White wire. Perform TEST VER-1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1.

TEST NS-2A - INSPECTING FUEL SYSTEM

1. Ensure throttle cables are not holding throttle open. If throttle is held open, repair as required. Perform TEST VER-1. If throttle is not held open, go to next step.
2. Using scan tool, read Throttle Position (TP) sensor voltage. If voltage is less than 1.5 volts, go to next step. If voltage is more than 1.5 volts, disconnect TP sensor connector. Inspect terminals. Repair as required. Perform TEST VER-1. If terminals are okay, replace TP sensor. Perform TEST VER-1.
3. Using scan tool, actuate fuel system. Listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, go to TEST NS-5A. If fuel pump operation can be heard, turn ignition off.
4. Ensure fuel tank is at least 1/4 full. Release fuel pressure. Install a fuel pressure gauge in fuel supply line. Turn ignition on. Using scan tool, actuate fuel system. Read fuel pressure gauge reading.
5. If fuel pressure is more than 44 psi (3.3 kg/cm 2 ), replace fuel filter/regulator. Perform TEST VER-1. If fuel pressure is less than 44 psi (3.3 kg/cm 2 ), go to next step.
6. If pressure is less than 34 psi (2.5 kg/cm 2 ), go to TEST NS-4A. If pressure is more than 34 psi (2.5 kg/cm 2 ), go to next step.
7. If vehicle initially starts and stalls repeatedly, go to TEST NS-7A. If vehicle does not initially start and stall repeatedly, go to TEST NS-3A.

TEST NS-3A - INSPECTING MECHANICAL SYSTEM

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is less than 4.5 volts, repair open Violet/White wire. Perform TEST VER-1.
2. If voltage is more than 4.5 volts, reconnect MAP sensor electrical connector. Remove all spark plugs. Inspect spark plug tips for wet fuel. If spark plug tips are wet, clean and reinstall spark plugs. If spark plug tips are not wet, reinstall spark plugs.
3. Inspect spark plug cables for correct placement. Reposition cables as required. Perform TEST VER-1. If cables are okay, turn ignition off. Check valve timing. Adjust valve timing as necessary. Perform TEST VER-1. If valve timing is okay, replace MAP sensor. Perform TEST VER-1.

TEST NS-4A - CORRECTING FUEL DELIVERY

Inspect fuel lines between fuel filter and fuel rail for restriction. Repair as required. Perform TEST VER-1. If no restrictions are observed, replace filter/regulator and primary filter. Perform TEST VER-1.

TEST NS-5A - INSPECTING FUEL PUMP

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Using scan tool, stop actuation test. Using scan tool, actuate Auto Shutdown (ASD) relay. Touch fuel pump relay. If fuel pump relay does not pulsate when actuated, go to TEST NS-5B. If fuel pump relay pulsates when actuated, turn ignition off.
2. Remove fuel pump relay. Using scan tool in voltmeter mode, check voltage on fuel pump relay connector, fused battery voltage circuit (Red wire on AB body; Red/White wire on AN and BR bodies). If voltage is less than 10 volts, repair open Red wire or Red/White wire. Perform TEST VER-1. If voltage is more than 10 volts, install a known good relay. Attempt to start engine. If engine starts, replace original relay. Perform TEST VER-1.
3. If engine does not start, reinstall original fuel pump relay. Disconnect fuel pump harness connector. Ensure fuel pump connector has clean and tight connections. Turn ignition on. Using scan tool, actuate fuel system. While still actuating, check voltage on fuel pump connector, fuel pump relay output circuit (Dark Green/Black wire) using scan tool in voltmeter mode. If voltage is less than 10 volts, repair open Dark Green/Black wire or Orange/Black wire. Perform TEST VER-1. If voltage is more than 10 volts, stop actuation test.
4. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of fuel pump connector, fuel pump ground circuit (Black wire). If resistance is more than 5 ohms, repair open Black wire. Perform TEST VER-1. If resistance is less than 5 ohms, replace fuel pump. Perform TEST VER-1.

TEST NS-5B - INSPECTING FUEL PUMP

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Remove fuel pump relay. Turn ignition on. Using scan tool in voltmeter mode, check voltage on fuel pump relay connector, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body).
2. If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue/Red wire. Perform TEST VER-1. If voltage is more than 10 volts, check resistance across fuel pump relay terminals using an external ohmmeter. see scheme 33 If resistance is more than 100 ohms, replace fuel pump relay. Perform TEST VER-1. If resistance is less than 100 ohms, repair open Dark Blue/Yellow wire. Perform TEST VER-1.

TEST NS-6A - CORRECTING NO RESPONSE CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. If vehicle starts, go to TEST NS-6B. If vehicle does not start, turn ignition off. Disconnect Throttle Position (TP) sensor connector. Turn ignition on.
2. Using scan tool in voltmeter mode, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is more than 6 volts, repair open ground circuits at Powertrain Control Module (PCM) connector terminals No. 11 (Black/Tan wire) and No. 12 (Black/Tan wire). Perform TEST VER-1. If voltage is less than 6 volts, go to next step.
3. If voltage is less than 4.4 volts, go to step 5). If voltage is more than 4.4 volts, reconnect TP sensor connector. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector.
4. Using scan tool, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is more than 4.4 volts, go to TEST NS-6B. If voltage is less than 4.4 volts, replace TP sensor. Perform TEST VER-1.
5. Disconnect Manifold Absolute Pressure (MAP) sensor electrical connector. Using scan tool, check voltage on TP sensor connector, 5-volt supply circuit (Violet/White wire). If voltage is more than 4.4 volts, replace MAP sensor. Perform TEST VER-1.
6. If voltage is less than 4.4 volts, turn ignition off. Disconnect PCM connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 6, 5-volt supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1.
7. If resistance is more than 5 ohms, check resistance between throttle position sensor connector, ground circuit (Black/Light Blue wire) and PCM connector terminal No. 6 (Violet/White wire) using an external ohmmeter. If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1.
8. If resistance is more than 5 ohms, turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 9, fused ignition switch output circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body). If voltage is less than 10 volts, repair open Dark Blue wire, Light Green/Black wire or Light Blue wire between PCM connector and ignition switch. Perform TEST VER-1.
9. If voltage is more than 10 volts, check voltage on PCM connector terminal No. 3, fused battery voltage circuit (Red wire on AB body; Red/White wire on AN and BR bodies) using scan tool. If voltage is more than 10 volts, replace PCM. Perform TEST VER-1. If voltage is less than 10 volts, go to next step.
10. Remove PCM fuse from Power Distribution Center (PDC). Inspect fuse. If fuse is okay, go to next step. If fuse is blown, go to step 12).
11. Using scan tool in voltmeter mode, check voltage on battery voltage side of PDC fuse socket. If voltage is more than 10 volts, repair open Red wire or Red/White wire between PDC fuse socket and PCM connector terminal No. 3. Perform TEST VER-1. If voltage is less than 10 volts, repair open battery voltage side of PDC fuse socket. Perform TEST VER-1.
12. Turn ignition off. Remove Auto Shutdown (ASD) relay and fuel pump relay. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 3, fused battery voltage circuit (Red wire on AB body); Red/White wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in Red/White wire or Red wire. Replace fuse. Perform TEST VER-1.
13. If resistance is more than 5 ohms, check resistance of ASD relay connector terminal, ASD relay output circuit (Dark Green/Orange wire). If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, go to TEST NS-6C.
14. Disconnect O2S connector. Using scan tool, check resistance of O2S connector, output circuit (White wire). If resistance is more than 5 ohms, replace O2S. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
15. Disconnect ignition coil connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace ignition coil. Replace fuse. Perform TEST VER-1.
16. If resistance is less than 5 ohms, disconnect generator field connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, repair short to ground in generator. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
17. Disconnect No. 1 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 1 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
18. Disconnect No. 2 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 2 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
19. Disconnect No. 3 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 3 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
20. Disconnect No. 4 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 4 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
21. Disconnect No. 5 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 5 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
22. Disconnect No. 6 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 6 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
23. On 6-cylinder models, repair short to ground in ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). Perform TEST VER-1.
24. Disconnect No. 7 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 7 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
25. Disconnect No. 8 fuel injector harness connector. Using scan tool, check resistance of ASD relay connector, ASD relay output circuit (Dark Green/Orange wire). If resistance is more than 5 ohms, replace No. 8 fuel injector. Replace fuse. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire or Dark Green/Black wire. Replace fuse. Perform TEST VER-1.

TEST NS-6B - CORRECTING NO RESPONSE CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. If ignition is not on when NO RESPONSE message is displayed, turn ignition on to get a response. If NO RESPONSE message returns, turn ignition off. Go to next step. If NO RESPONSE message does not return, test is complete. If ignition is on when NO RESPONSE message is displayed, turn ignition off. Go to next step.
2. Disconnect scan tool from Data Link Connector (DLC). Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between DLC, SCI transmit circuit (Pink wire on) and ground. If resistance is less than 5 ohms, repair short to ground in Pink or Black wire. Perform TEST VER-1.
3. If resistance is more than 5 ohms, use an external ohmmeter to check resistance between DLC, SCI receive circuit (Light Green wire) and ground. If resistance is less than 5 ohms, repair short to ground in Light Green or Black/Yellow wire. Perform TEST VER-1.
4. If resistance is more than 5 ohms, check resistance of SCI transmit circuit (Pink wire) between DLC and PCM connector terminal No. 25 using an external ohmmeter. If resistance is more than 5 ohms, repair open Pink or Black wire. Perform TEST VER-1.
5. If resistance is less than 5 ohms, use an external ohmmeter to check resistance of SCI receive circuit (Light Green wire) between DLC and PCM connector terminal No. 45. If resistance is more than 5 ohms, repair open Light Green or Black/Yellow wire. Perform TEST VER-1.
6. If resistance is less than 5 ohms, connect scan tool to a functional DLC on another vehicle. Turn ignition on. Using scan tool, attempt to read trouble codes. If scan tool does not display NO RESPONSE, replace PCM on initial vehicle. Perform TEST VER-1.
7. If scan tool displays NO RESPONSE, substitute another scan tool adapter cable. Using scan tool, attempt to read trouble codes. If scan tool does not display NO RESPONSE, replace scan tool adapter cable. If scan tool displays NO RESPONSE, repair or replace scan tool.

TEST NS-6C - CORRECTING NO RESPONSE CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

Disconnect fuel pump harness connector. Using scan tool in ohmmeter mode, check resistance of fuel pump relay connector, fuel pump relay output circuit (Dark Green/Black wire). If resistance is less than 5 ohms, repair short to ground in Dark Green/Black wire. Replace fuse. Perform TEST VER-2. If resistance is more than 5 ohms, replace fuel pump. Replace fuse. Perform TEST VER-1.

TEST NS-7A - INSPECTING IDLE AIR CONTROL MOTOR OPERATION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Disconnect Idle Air Control (IAC) motor connector. Turn ignition on. Using scan tool, actuate IAC motor. Using scan tool in voltmeter mode, check voltage on IAC motor connector, driver No. 3 circuit (Gray/Red wire). If voltage stays less than one volt, go to TEST NS-7B.
2. If voltage did not stay less than one volt, check voltage on IAC motor connector, driver No. 1 circuit (Brown/White wire). If voltage stays less than one volt, go to TEST NS-7C.
3. If voltage did not stay less than one volt, check voltage on IAC motor connector, driver No. 4 circuit (Violet/Black wire). If voltage stays less than one volt, go to TEST NS-7D.
4. If voltage did not stay less than one volt, check voltage on IAC motor connector, driver No. 2 circuit (Yellow/Black wire). If voltage stays less than one volt, go to TEST NS-7E.
5. If voltage did not stay less than one volt, turn ignition off. Remove IAC motor from throttle body. Reconnect IAC motor connector. Turn ignition on. Using scan tool, actuate IAC motor. If IAC motor pintle moves in and out, go to TEST NS-8A. If IAC motor pintle does not move in and out, replace IAC motor. Perform TEST VER-1.

TEST NS-7B - INSPECTING IDLE AIR CONTROL MOTOR OPERATION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connectors for damaged, pushed-out or miswired terminals. Repair as required. Perform TEST VER-1. If PCM terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of driver No. 3 circuit (Gray/Red wire) between IAC motor connector and PCM connector terminal No. 39. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Gray/Red wire or Yellow/Black wire. Perform TEST VER-1.

TEST NS-7C - INSPECTING IDLE AIR CONTROL MOTOR OPERATION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connectors for damaged, pushed-out or miswired terminals. Repair as required. Perform TEST VER-1. If PCM terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of driver No. 1 circuit (Brown/White wire) between IAC motor connector and PCM connector terminal No. 40. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Brown/White wire. Perform TEST VER-1.

TEST NS-7D - INSPECTING IDLE AIR CONTROL MOTOR OPERATION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connectors for damaged, pushed-out or miswired terminals. Repair as required. Perform TEST VER-1. If PCM terminals are okay, go to next step.
2. Using an external ohmmeter, check resistance of driver No. 4 circuit (Violet/Black wire) between IAC motor connector and PCM connector terminal No. 59. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Violet/Black or Gray/Red wire. Perform TEST VER-1.

TEST NS-7E - INSPECTING IDLE AIR CONTROL MOTOR OPERATION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Inspect connectors for damaged, pushed-out or miswired terminals. Repair as required. Perform TEST VER-1. If PCM terminals are okay, go to next step.
2. Using external ohmmeter, check resistance of driver No. 2 circuit (Yellow/Black wire) between IAC motor connector and PCM connector terminal No. 60. If resistance is more than 5 ohms, repair open Yellow/Black wire or Violet/Black wire. Perform TEST VER-1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1.

TEST NS-8A - CORRECTING START & STALL CONDITION

At this point in diagnostic test procedure, all engine control systems have been determined to be operating as designed and not causing a start and stall problem. Check following items as possible causes

1. Check if any Technical Service Bulletins (TSBs) apply to vehicle.
2. Check distributor position. See CHECKING DISTRIBUTOR POSITION.
3. Check valve timing.
4. Check engine compression.
5. Check for exhaust system restriction.
6. Ensure PCV system is functioning properly.
7. Check camshaft and crankshaft sprockets.
8. Check for fuel contamination.
9. Check secondary ignition system.

Note. Adjusting distributor position does not adjust ignition timing. Ignition timing is controlled by Powertrain Control Module (PCM).

Connect scan tool to data link connector. Select SET SYNC. Start engine and observe scan tool display. If distributor is correctly positioned, an IN RANGE message will appear along with 0° (zero degrees). If distributor needs to be adjusted, loosen distributor hold-down bolt. Rotate distributor until reading is as close to 0° (zero degrees) as possible and IN RANGE message is displayed. Tighten distributor hold-down bolt to 17 ft. lbs. (23 N.m).

TEST NS-9A - REPAIRING NO CRANK CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. If vehicle is equipped with manual transmission, go to TEST NS-9B. If vehicle is equipped with automatic transmission, ensure transmission is in Park.
2. Using scan tool, read park/neutral position switch sense. If park/neutral position switch senses PARK, go to next step. If park/neutral position switch does not sense PARK, repair open in park/neutral position switch ground circuit.
3. Disconnect starter relay. Using scan tool in voltmeter mode, check voltage on starter relay connector, fused battery supply circuit (Black wire). If voltage is less than 10 volts, repair open in Black wire or Red/White wire. Perform TEST VER-1.
4. If voltage is more than 10 volts, check voltage on starter relay connector, ignition switch output circuit (Yellow wire). Hold ignition switch in RUN position while observing voltmeter. If voltage is less than 10 volts, repair open Yellow wire or Yellow/Dark Blue wire. Perform TEST VER-1. If voltage is more than 10 volts, go to next step. WARNING: Engine may crank in following step. Keep away from moving engine parts.
5. Ensure transmission is in Park and parking brake is set. Briefly connect a jumper wire between starter relay connector, fused battery voltage circuit (Black wire) and starter relay output circuit (Brown wire). Go to TEST NS-9C.

TEST NS-9B - REPAIRING NO CRANK CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. Disconnect starter relay. Using scan tool in ohmmeter mode, check resistance on starter relay connector, ground circuit Brown/Orange wire on AB and BR bodies; Brown/Yellow wire on AN body). If resistance is more than 5 ohms, repair open Brown/Orange, Brown/Yellow wire or Black/White wire. Perform TEST VER-1.
2. If resistance is less than 5 ohms, put scan tool in voltmeter mode. Using scan tool, check voltage on starter relay connector, fused battery voltage circuit (Black wire). If voltage is less than 10 volts, repair open Black wire or Red/White wire. Perform TEST VER-1.
3. If voltage is more than 10 volts, use an external voltmeter to check voltage on starter relay connector, ignition switch output circuit (Yellow wire). Hold ignition switch in RUN position while observing voltmeter. If voltage is less than 10 volts, repair open Yellow wire or Yellow/Dark Blue wire. Perform TEST VER-1. If voltage is more than 10 volts, go to next step. WARNING: Engine may crank in following step. Keep away from moving engine parts.
4. Ensure transmission is in Neutral and parking brake is set. Briefly connect a jumper wire between starter relay connector, fused battery voltage circuit (Black wire) and ignition switch output circuit (Yellow wire). Go to TEST NS-9C.

TEST NS-9C - REPAIRING NO CRANK CONDITION

Note. For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS section at the end of this article.

1. If engine cranked, replace starter relay. Perform TEST VER-1. If engine did not crank, disconnect jumper wire. Note if starter solenoid clicked when jumper wire was connected. Disconnect starter relay output wire (Brown wire) from starter solenoid.
2. Using an external ohmmeter, check resistance of Brown wire or Light Green/Black wire between starter relay connector and starter solenoid connector. If resistance is more than 5 ohms, repair open in Brown wire or Light Green/Black wire. Perform TEST VER-1. If resistance is less than 5 ohms, reinstall starter relay.
3. Check battery cables for high resistance. If either battery circuit had a voltage drop of more than 0.2 volt, repair battery circuit for high resistance. Perform TEST VER-1. If voltage Drop for either battery circuit is less than 0.2 volt, go to next step.
4. If starter solenoid clicked when jumper wire was connected in step 1), repair starter for a mechanical failure. Perform TEST VER-1. If starter solenoid did not click when jumper wire was connected in step 1), replace starter solenoid. Perform TEST VER-1.

TEST VER-1 - NO START VERIFICATION PROCEDURE

1. Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Inspect engine oil for fuel contamination. Change oil and filter if necessary. Attempt to start engine.
2. If engine does not start, check if any Technical Service Bulletins (TSBs) apply to vehicle and return to TEST TC-1A, if necessary. If engine starts and Powertrain Control Module (PCM) was changed, repair is complete. If engine starts and PCM was not changed, connect scan tool to PCM data link connector and erase trouble codes. Repair is complete.

TEST VER-2 - ROAD TEST VERIFICATION PROCEDURE

Inspect vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If another trouble code was read previously and not corrected, return to TEST TC-1A and follow path specified by other trouble code. If Powertrain Control Module (PCM) has not been replaced, perform following

1. Connect scan tool to Data Link Connector (DLC), and erase trouble codes.
2. Using scan tool, reset all values in adaptive memory.
3. Disconnect scan tool.

To ensure no other trouble code remains on models with A/C, perform following

1. Turn on A/C and blower motor. Drive vehicle for at least 5 minutes and attain a speed of at least 40 MPH. Ensure transmission shifts through all gears.
2. Upon completion of road test, turn engine off. Restart engine, and let it idle for at least 2 minutes. Turn engine off. Connect scan tool to DLC.
3. Read all trouble codes. If repaired trouble code has reset, repair is not complete. Check all pertinent Technical Service Bulletins (TSBs), and return to TEST TC-1A if necessary. If another trouble code exists, return to TEST TC-1A and follow path specified by other trouble code. If no other trouble codes exist, repair is now complete.

SUMMARY

If no hard trouble codes (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to appropriate TESTS W/O CODES - GASOLINE article below for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

1. «TESTS W/O CODES - GASOLINE»(ref-11123) (for Dakota)
2. «TESTS W/O CODES - GASOLINE»(ref-11131) (for Ram Pickup)
3. «TESTS W/O CODES - GASOLINE»(/dodge/ram-van-b2500/b-pre-1995-1995/remont/testing-diagnostics/#engine-controls-tests-wo-codes-gasoline) (for Ram Van/Wagon)

Wiring Diagram (Dakota - 3.9L - 1 Of 2). Scheme 29

Wiring Diagram (Dakota - 3.9L - 2 Of 2). Scheme 30

Wiring Diagram (Ram Pickup - 3.9L - 1 Of 2). Scheme 31

Wiring Diagram (Ram Pickup - 3.9L - 2 Of 2). Scheme 32

Wiring Diagram (Ram Van/Wagon - 3.9L - 1 Of 2). Scheme 33

Wiring Diagram (Ram Van/Wagon - 3.9L - 2 Of 2). Scheme 34

See also:
• BASIC TESTING - 3.9L
• TESTS W/O CODES - GASOLINE
• COMPUTER RELEARN PROCEDURES
• TESTS W/CODES - BODY CONTROL COMPUTER
• GENERATOR & REGULATOR
• CRUISE CONTROL SYSTEM
• FUEL PRESSURE RELEASE
• VISUAL INSPECTION
• ENTERING ON-BOARD DIAGNOSTICS
• TROUBLE CODES/MESSAGES
• CLEARING TROUBLE CODES
• DATA LINK CONNECTOR (DLC)
• CONNECTOR IDENTIFICATION
• Code 11
• Code 54
• Code 13
• Code 14
• Code 14
• Code 15
• Code 21
• Code 21
• Code 52
• Code 52
• Code 51
• Code 51
• Code 21
• Code 21
• Code 52
• Code 22
• Code 22
• Code 23
• Code 23
• Code 24
• Code 24
• Code 25
• Code 27
• Code 32
• Code 32
• Code 31
• Code 37
• Code 45
• Code 33
• Code 42
• Code 42
• Code 37
• Code 37
• Code 62 or 63
• INACTIVE TROUBLE CODE CONDITION
• TEST TC-23B
• TEST TC-23C
• TEST TC-23D
• TEST TC-23E
• TC-24B
• TC-25A
• TC-26A
• TC-27A
• TC-28A
• TC-29A
• TC-30A
• TC-31A
• NTC-2A
• NTC-3A
• NTC-4A
• NTC-5A
• NTC-6A
• NTC-7A
• NTC-9A
• NTC-10A
• NTC-11A
• NTC-12A
• NTC-13A
• NTC-14A
• NTC-15A
• NTC-16A