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Contents Section: Testing & Diagnostics All sections

Engine Controls - Tests W/codes - 5.2l Cng Dodge Ram Wagon B3500

Testing & Diagnostics 28 illustrations ~32307 words

INTRODUCTION

If no faults were found while performing steps in the CHRYSLER CORP. - BASIC DIAGNOSTIC PROCEDURES - 5.2L CNG article, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTCs) or only pass codes are present after entering self-diagnostics, proceed to TEST NTC-1A and TEST NS-1A in this article and CHRYSLER CORP. TROUBLE SHOOTING - NO CODES - 5.2L CNG article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.).

MODEL IDENTIFICATION

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

Model NameBody Type
DakotaAN
Ram Pickup (1500/3500)BR
Ram Van/Wagon (150/350)AB

BODY CODE DESIGNATION

FUEL PRESSURE RELEASE

WARNINGALWAYS relieve fuel pressure before attempting to open system for testing or component replacement. High fuel pressure may be present in fuel lines and component parts. DO NOT allow fuel to flow onto engine or electrical parts while testing fuel system components.

FUEL SYSTEM PURGING

Before any part of Compressed Natural Gas (CNG) fuel system is opened for repair, system must be purged of all natural gas.

The fuel system must first be purged of natural gas if any of the following components are to be removed or repaired

  1. CNG Temperature Sensor
  2. CNG Low-Pressure Sensor
  3. Fuel Tube Or Fuel Tube Fitting
  4. Fuel Injector Rail Assembly
  5. Fuel Fill Receptacle
  6. Fuel Cylinder
  7. Manual Shutoff Valve
  8. Fuel Filter
  9. Fuel Injectors
  10. Low Pressure Fuel Shutoff Solenoid
  11. Fuel Pressure Regulator
  12. Fill Check Valves
  13. High Pressure Fuel Shutoff Solenoid

FUEL TUBE PURGING

  1. Close control valve (clockwise) on side mounted fuel cylinder. Close control valves (clockwise) on rear mounted fuel cylinders. Open manual shutoff valve.
  2. Start and operate engine until it runs out of fuel. Attempt 3 more engine starts. If check valve or fuel fill receptacle is to be serviced, slowly loosen inlet side of fuel fill tube fitting at check valve. It is normal for approximately 25 psi of natural gas pressure to flow from loosened fitting. At this point, all fuel tubes are purged of natural gas between fuel cylinders and engine. It is now okay to open fuel system for repair.

FUEL CYLINDER PURGING

  1. Open manual shutoff valve. Open only the fuel control valve(s) (counterclockwise) on the fuel cylinder(s) to be serviced. Close all other control valve(s) (clockwise) on fuel cylinder(s) not being serviced.
  2. Start and operate engine until it runs out of fuel. Attempt 3 more engine starts. At this point, all fuel tubes and opened cylinders are purged of natural gas between fuel cylinders and engine. It is now okay to open fuel system for repair.
CAUTIONFuel cylinders not being serviced still contain high pressure fuel.

SELF-DIAGNOSTIC SYSTEM

CAUTIONWhen 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 article in GENERAL INFORMATION section before disconnecting battery.

SYSTEM DIAGNOSTICS

Note. The Malfunction Indicator Light (MIL) may also be referred to as the CHECK ENGINE light.

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 Diagnostic Trouble Code (DTC), 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.

Once codes are known, see DTCS/MESSAGES to determine the questionable circuit. Test circuits and repair or replace components as required. If problem is repaired or ceases to exist, the PCM cancels DTC after 50 ignition on/off cycles. To clear codes, see CLEARING DTCS .

A specific DTC results from a particular system failure. A DTC does not condemn a specific component. Component is not necessarily the reason for failure. DTCs 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 fault goes away. However, the corresponding DTC will be retained in PCM memory. If related trouble does not reoccur within a certain time frame, related DTC will be erased from PCM memory. Intermittent failures can be caused by faulty sensor, bad connector or wiring related problem. See TEST NTC-1A or INTERMITTENTS in CHRYSLER CORP. TROUBLE SHOOTING - NO CODES - 5.2L CNG article in the ENGINE PERFORMANCE section.

SERVICE PRECAUTIONS

Before proceeding with diagnosis, the following precautions must be followed

  1. ALWAYS purge fuel system pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components. See «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) .
  2. 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-wagon-b3500/1991-2000/remont/computer-relearn/#computer-relearn-procedures) article in GENERAL INFORMATION section before disconnecting battery.
  3. Vehicle must have a fully charged battery and functional charging system.
  4. Probe PCM 60-pin connector from pin side. DO NOT backprobe PCM connector.
  5. DO NOT cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
  6. DO NOT use a test light instead of a voltmeter.
  7. 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.
  8. DO NOT prolong testing of fuel injectors, or engine may hydro-statically (liquid) lock.
  9. Always repair lowest DTC number (MIL) or first trouble message displayed (scan tool) first.
  10. Always perform verification procedure test after repairs are made.
  11. Always disconnect scan tool after use.
  12. 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.

Always perform a visual inspection before attempting to diagnose engine control system problems. See VISUAL INSPECTION . Enter on-board diagnostics, and retrieve DTCs. Refer to the ENTERING ON-BOARD DIAGNOSTICS . If DTCs are not present and/or Diagnostic Readout Box (DRB) or generic scan tool is used, proceed to one of the following tests

  1. Go to «TEST NS-1A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ns-1a-inspecting-fuel-system) (NO-START TEST-1A) in this article if a no-start condition exists or engine stalls after start-up. Perform indicated VERIFICATION TEST after repairs have been made.
  2. Go to «TEST TC-1A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-1a-checking-system-for) (TROUBLE CODE TEST-1A) in this article if a driveability problem exists and DTCs are present. Perform indicated VERIFICATION TEST after repairs have been made.
  3. Go to «TEST NTC-1A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-1a-no-dtc-test) (NO TROUBLE CODE TEST-1A) if a driveability problem exists and no DTCs are present. Perform indicated VERIFICATION TEST after repairs have been made.

ENTERING ON-BOARD DIAGNOSTICS

Note. The Malfunction Indicator Light (MIL) may also be referred to as the CHECK ENGINE light.

Note. Although other scan testers are available, manufacturer recommends using Diagnostic Readout Box (DRB) to diagnose system.

Malfunction Indicator Light (MIL) Diagnostic Mode

  1. Start engine (if possible). On models equipped with A/T, move transmission shift lever through all gear positions, ending in Park. On all models, turn A/C on, then off (if equipped).
  2. Turn engine off. Without starting engine again, turn ignition on, off, on, off, and on. Record 2-digit DTCs as displayed by flashing MIL.
  3. For example, 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. Once MIL begins to flash DTCs, it cannot be stopped. If count is lost, start over. Code 55 indicates end of DTC display. NOTE: When using diagnostic tests, DO NOT skip any steps in test procedure, or incorrect diagnosis may result.
  5. Refer to «DTCS/MESSAGES»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__dtcsmessages-note-for-dtc-table-see) to translate DTC number to a system fault description (display on scan tool). Once DTC description is obtained, refer to «TEST TC-1A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-1a-checking-system-for) and proceed to appropriate test. Test procedure may vary depending whether DTC is a hard or intermittent failure.

Note. While using DRB scan tool, if an error is made or technician is unaware of correct procedures, enter "F1" (Help) or HOW TO USE DRB from various menus. While using generic scan tool, refer to manufacturer's instructions.

Scan Tool Diagnostic Mode

  1. Turn all accessories off. Turn ignition off. Attach appropriate 1995 cartridge to scan tool. Connect scan tool to Data Link Connector (DLC). DLC is located in engine compartment, near PCM.
  2. Turn ignition on. Start engine (if possible). With foot on brake, move transmission shift lever through all positions, ending in Park (A/T) or Neutral (M/T). Turn A/C switch on and then off (if equipped).
  3. Turn ignition off. Without starting engine again, turn ignition on. Enter selection No. 1, STANDALONE DRB. Enter selection No. 1, CHRYSLER DOMESTIC. Enter selection No. 1, ENGINE. Proceed until READ DTCS selection is offered. After DTCs are accessed, go to TEST NS-1A (NO-START TEST-1A) or TEST TC-1A (DTC TEST-1A) (see below) to diagnose problem.
  4. To erase DTCs while in this mode, press BACK key. At scan tool display, scroll to YES - ERASE DTCS. A confirmation message should then appear, DTCS ERASED. «TEST TC-1A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-1a-checking-system-for) (DTC TEST-1A)

CLEARING DTCS

CAUTIONWhen 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 article in GENERAL INFORMATION section before disconnecting battery.

DTCs can be cleared by disconnecting negative battery cable for at least 15 seconds, allowing PCM to clear DTCs. DTCs can also be cleared using scan tool. See step 4) in SCAN TOOL DIAGNOSTIC MODE under ENTERING ON-BOARD DIAGNOSTICS .

DTCS/MESSAGES (Note: For DTC table, see TEST TC-1A under "Self-Diagnostic Tests.")

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

Code 11

Scan tool displays NO CRANK REFERENCE SIGNAL AT PCM. Condition is: no reference signal from crankshaft position sensor picked up during cranking.

Code 12

Scan tool displays BATTERY DISCONNECT. Condition is: battery input to PCM was disconnected within last 50 key-on cycles.

Code 15

Scan tool displays NO VEHICLE SPEED SIGNAL. Condition is: no speed sensor signal detected with road load conditions.

Code 23

Scan tool displays INTAKE AIR TEMP SENSOR VOLTAGE LOW. Condition is: Intake Air Temperature (IAT) sensor input less than minimum acceptable voltage.

Scan tool displays INTAKE AIR TEMP SENSOR VOLTAGE HIGH. Condition is: Intake Air Temperature (IAT) sensor input more than maximum acceptable voltage.

Code 24

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

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

Code 33

Scan tool displays A/C CLUTCH RELAY CIRCUIT. Condition is: open or short detected in A/C clutch relay circuit.

Code 34

Scan tool displays SPEED CONTROL SOLENOID CIRCUIT. Condition is: open or short detected in speed control vacuum or vent solenoid circuits.

Scan tool displays SPEED CONTROL SWITCH ALWAYS LOW. Condition is: speed control switch input below minimum acceptable voltage.

Scan tool displays SPEED CONTROL SWITCH ALWAYS HIGH. Condition is: speed control switch input above maximum acceptable voltage.

Code 37

Scan tool displays TORQUE CONVERTER CLUTCH SOLENOID CKT. Condition is: open or short In TCC solenoid circuit.

Scan tool displays TRANS TEMP SENSOR VOLTAGE TOO LOW. Condition is: transmission temperature sensor input less than minimum acceptable voltage.

Scan tool displays TRANS TEMP SENSOR VOLTAGE TOO HIGH. Condition is: transmission temperature sensor input more than maximum acceptable voltage.

Code 41

Scan tool displays GENERATOR FIELD NOT SWITCHING PROPERLY. Condition is: generator field not switching properly.

Code 42

Scan tool displays AUTO SHUTDOWN RELAY CONTROL CIRCUIT. Condition is: an open or short detected in Auto Shutdown (ASD) relay circuit.

Code 44

Scan tool displays BATTERY TEMP SENSOR VOLTS OUT OF LIMIT. Condition is: open or short in Engine Coolant Temperature (ECT) sensor circuit or PCM battery temperature voltage circuit malfunction.

Code 45

Scan tool displays TRANS OVERDRIVE SOLENOID CIRCUIT. Condition is: open or short detected in overdrive solenoid circuit.

Code 46

Scan tool displays CHARGING SYSTEM VOLTAGE TOO HIGH. Conditions are: battery voltage must be at least one volt more than target charging voltage.

Code 47

Scan tool displays CHARGING SYSTEM VOLTAGE TOO LOW. Conditions are: battery voltage must be at least one volt less than target charging voltage.

Code 53

Scan tool displays INTERNAL PCM FAILURE. Condition is: internal failure in PCM.

Code 55

Scan tool display is blank. Completion of DTC display by Malfunction Indicator Light (MIL).

Code 62

Scan tool displays PCM FAILURE SRI MILES NOT STORED. Condition is: unsuccessful attempt to update SRI mileage in PCM.

Code 63

Scan tool displays PCM FAILURE EEPROM WRITE DENIED. Condition is: unsuccessful attempt to write to EEPROM location by PCM.

INACTIVE DTC CONDITION

This procedure applies if you have been sent here from diagnostic tests and have just attempted to simulate condition that initially set fault message. 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).

CONNECTOR IDENTIFICATION

ConnectorSee
A/C Clutch Relay(Scheme 70)
Auto Shutdown (ASD) Relay(Scheme 71)
Camshaft Position (CMP) Sensor(Scheme 72)
CNG Low Pressure Sensor(Scheme 73)
CNG Temperature Sensor(Scheme 74)
Crankshaft Position (CKP) Sensor(Scheme 75)
Data Link Connector (DLC)(Scheme 76)
Engine Coolant Temperature (ECT) Sensor(Scheme 78)
Exhaust Gas Recirculation (EGR) Solenoid(Scheme 79)
Fuel Injector(Scheme 80)
High Pressure Fuel Shutoff Relay(Scheme 81)
High Pressure Fuel Shutoff Solenoid(Scheme 83)
Idle Air Control (IAC) Motor(Scheme 84)
Ignition Coil(Scheme 86)
Intake Air Temperature (IAT) Sensor(Scheme 87)
Low Pressure Fuel Shutoff Solenoid(Scheme 88)
Manifold Absolute Pressure (MAP) Sensor(Scheme 89)
Park/Neutral (P/N) Position Switch(Scheme 91)
Powertrain Control Module (PCM)(Scheme 92)
Overdrive (OD) Solenoid/Torque Convertor Clutch (TCC) Solenoid(Scheme 93)
Oxygen Sensor(Scheme 95)
Throttle Position (TP) Sensor(Scheme 96)
Vehicle Speed Sensor (VSS)(Scheme 97)

CONNECTOR IDENTIFICATION

TerminalWire Color
A(1) Dark Blue
B(2) Red/Light Green
CDark Blue/Orange
DDark Blue/Black
(1) Light Green/Black wire on BR body. (2) Gray wire on AN body; Violet wire on BR body.
(1)Light Green/Black wire on BR body.
(2)Gray wire on AN body; Violet wire on BR body.

A/C CLUTCH RELAY CONNECTOR TERMINAL IDENTIFICATION

Scheme 70

Scheme 70
Scheme 70
TerminalWire Color
A(1) Dark Blue
B(2) Red
C(3) Dark Blue/Yellow
DDark Blue/Black
(1) Light Green/Black wire on BR body. (2) Red/White wire on AN body. Gray/White wire on BR body. (3) Dark Blue/Orange wire on BR body.
(1)Light Green/Black wire on BR body.
(2)Red/White wire on AN body. Gray/White wire on BR body.
(3)Dark Blue/Orange wire on BR body.

ASD RELAY CONNECTOR TERMINAL IDENTIFICATION

Scheme 71

Scheme 71
Scheme 71

Scheme 72

Scheme 72
Scheme 72
Terminal No.Wire Color
1Violet/White
2Black/Light Blue
3(1) Dark Green/Orange
(1) Dark Green/Light Blue wire on AN and BR bodies.
(1)Dark Green/Light Blue wire on AN and BR bodies.

CNG LOW PRESSURE SENSOR CONNECTOR TERMINAL ID

Scheme 73

Scheme 73
Scheme 73

Scheme 74

Scheme 74
Scheme 74
Terminal No.Wire Color
1Gray/Black
2Black/Light Blue
3Orange

CKP SENSOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 75

Scheme 75
Scheme 75

Scheme 76

Scheme 76
Scheme 76

Scheme 77

Scheme 77
Scheme 77

Scheme 78

Scheme 78
Scheme 78
Terminal No.FunctionWire Color
1ASD Relay OutputDark Green/Orange
2Injector No. 1 DriverWhite/Brown
2Injector No. 2 DriverWhite
2Injector No. 3 DriverWhite/Yellow
2Injector No. 4 DriverWhite/Light Blue
2Injector No. 5 DriverWhite/Black
2Injector No. 6 DriverWhite/Red
2Injector No. 7 DriverWhite/Tan
2Injector No. 8 DriverWhite/Gray

FUEL INJECTOR CONNECTOR TERMINAL ID

Scheme 79

Scheme 79
Scheme 79
TerminalWire Color
A(1) Dark Blue
B(2) Red
CDark Blue/Yellow
DDark Green/Black
(1) Light Green/Black wire on BR body. (2) Red/White wire on AN body; Dark Green/Black wire on BR body.
(1)Light Green/Black wire on BR body.
(2)Red/White wire on AN body; Dark Green/Black wire on BR body.

HIGH PRESSURE FUEL SHUTOFF RELAY CONNECTOR TERMINAL ID

Scheme 80

Scheme 80
Scheme 80

Scheme 81

Scheme 81
Scheme 81

Scheme 82

Scheme 82
Scheme 82
Terminal No.Wire Color
1Dark Green/Orange
2(1) Gray
(1) Black/Gray wire on BR body.
(1)Black/Gray wire on BR body.

IGNITION COIL CONNECTOR TERMINAL IDENTIFICATION

Scheme 83

Scheme 83
Scheme 83

Scheme 84

Scheme 84
Scheme 84
Terminal No.Wire Color
1Dark Green/Orange
2Black/Tan

LOW PRESSURE FUEL SHUTOFF SOLENOID CONNECTOR TERMINAL ID

Scheme 85

Scheme 85
Scheme 85

Scheme 86

Scheme 86
Scheme 86

Scheme 87

Scheme 87
Scheme 87

Scheme 88

Scheme 88
Scheme 88

Scheme 89

Scheme 89
Scheme 89
Terminal No.Wire Color
1Black/Light Blue
2Black/Light Green
3Black/Tan
4Dark Green/Orange

O2S CONNECTOR TERMINAL IDENTIFICATION

Scheme 90

Scheme 90
Scheme 90
Terminal No.Wire Color
1Black/Light Blue
2Orange/Dark Blue
3Violet/White

TP SENSOR CONNECTOR TERMINAL IDENTIFICATION

Scheme 91

Scheme 91
Scheme 91

Scheme 92

Scheme 92
Scheme 92
CAUTIONWhen 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 article in GENERAL INFORMATION section before disconnecting battery.

SELF-DIAGNOSTIC TESTS

Note. In following self-diagnostic tests, illustrations are courtesy of Chrysler Corp. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAMS section at the end of this article.

CAUTIONAlways turn ignition switch to OFF position before disconnecting or connecting any module connector.

TEST TC-1A - CHECKING SYSTEM FOR DTCS

Note. Battery must be fully charged before proceeding.

  1. Try to start engine. If necessary, crank engine for up to 10 seconds. Connect scan tool to data link connector. Record scan tool DTCs. If scan tool screen displays NO RESPONSE, go to TEST NS-6A.
  2. If scan tool displays an error message, or has a blank screen, go to «DTCS/MESSAGES»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__dtcsmessages-note-for-dtc-table-see) . If DTCs are not displayed, go to TEST NS-1A for no-start tests or TEST NTC-1A for no DTC tests. NOTE: ENGINE COLD TOO LONG DTC may set erroneously if ambient temperature is extremely cold.
  3. If DTC ENGINE COLD TOO LONG is displayed, check engine cooling system. Repair as required. If DTC INTERNAL CONTROLLER FAILURE or CONTROLLER FAILURE is displayed, replace Powertrain Control Module (PCM). Perform TEST VER-2. If other DTCs are displayed, see SCAN TOOL DTC MESSAGES table below and perform appropriate test(s).
DTCScan Tool MessageTest No.
Code 11NO CRANK REFERENCE SIGNAL AT PCMTC-2A
Code 54NO CAM SIGNAL AT PCMTC-3A
Code 13NO CHANGE IN MAP FROM START TO RUNTC-4A
Code 14MAP SENSOR VOLTAGE TOO LOWTC-5A
Code 14MAP SENSOR VOLTAGE TOO HIGHTC-6A
Code 15NO VEHICLE SPEED SENSOR SIGNALTC-7A
Code 21O2S STAYS AT CENTERTC-8A
Code 52O2S STAYS ABOVE CENTER (RICH)TC-9A
Code 51O2S STAYS BELOW CENTER (LEAN)TC-10A
Code 21O2S SHORTED TO VOLTAGETC-11A
Code 52 or 51IDLE ADAP MEM AT LEAN LIMIT OR IDLE ADAP MEM AT RICH LIMITTC-12A
Code 24THROTTLE POSITION SENSOR VOLTAGE LOWTC-13A
Code 24THROTTLE POSITION SENSOR VOLTAGE HIGHTC-14A
Code 22ECT SENSOR VOLTAGE TOO LOWTC-15A
Code 22ECT SENSOR VOLTAGE TOO HIGHTC-16A
Code 23INTAKE AIR TEMP SENSOR VOLTAGE LOWTC-17A
Code 23INTAKE AIR TEMP SENSOR VOLTAGE HIGHTC-18A
Code 64CNG TEMP SENSOR VOLTAGE TOO LOWTC-19A
Code 64CNG TEMP SENSOR VOLTAGE TOO HIGHTC-20A
Code 64CNG PRESSURE SENSOR VOLTAGE TOO LOWTC-21A
Code 64CNG PRESSURE SENSOR VOLTAGE TOO HIGHTC-22A
Code 25IDLE AIR CONTROL MOTOR CIRCUITSTC-23A
Code 33A/C CLUTCH RELAY CIRCUITTC-24A
Code 42NO ASD RELAY OUTPUT VOLTAGE AT PCMTC-25A
Code 42AUTO SHUTDOWN RELAY CONTROL CIRCUITTC-26A
Code 45TRANS OVERDRIVE SOLENOID CIRCUITTC-27A
Code 37TORQUE CONVERTER CLUTCH SOLENOID CIRCUITTC-28A
Code 32EGR SOLENOID CIRCUITTC-29A
Code 32EGR SYSTEM FAILURETC-30A
Code 62PCM FAILURE SRI MILE NOT STOREDTC-31A
Code 63PCM FAILURE EEPROM WRITE DENIEDTC-31A
Code 35LOW SPEED FAN CONTROL CIRCUITTC-32A
Code 35HIGH SPEED FAN CONTROL CIRCUITTC-33A
Code 43IGNITION COIL #1 PRIMARY CIRCUITTC-34A
Code 43IGNITION COIL #2 PRIMARY CIRCUITTC-35A
Code 43IGNITION COIL #3 PRIMARY CIRCUITTC-36A
Code 27INJECTOR CONTROL CIRCUITTC-37A
Code 41ALTERNATOR FIELD NOT SWITCHING PROPERLY(1)
Code 46CHARGING SYSTEM VOLTAGE TOO HIGH(1)
Code 47CHARGING SYSTEM VOLTAGE TOO LOW(1)
Code 44BATTERY TEMP SENSOR VOLTAGE OUT OF LIMIT(1)
Code 34SPEED CONTROL SOLENOID CIRCUITS(2)
(1) See appropriate GENERATOR & REGULATOR article in the ELECTRICAL section. See article references after this table. (2) See appropriate CRUISE CONTROL SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section. See article references after this table.
(1)See appropriate GENERATOR & REGULATOR article in the ELECTRICAL section. See article references after this table.
(2)See appropriate CRUISE CONTROL SYSTEM article in ACCESSORIES/SAFETY EQUIPMENT section. See article references after this table.

SCAN TOOL DTC MESSAGES

SCAN TOOL DTC MESSAGES ARTICLE REFERENCES

  1. «CHRYSLER CORP. - GENERATORS & REGULATORS»(ref-11148) (for Dakota)
  2. «CHRYSLER CORP. - GENERATORS & REGULATORS»(/dodge/ram-wagon-b3500/1991-2000/remont/charging-system/#generator-regulator) (for Ram Pickup & Ram Van/Wagon)
  3. «CHRYSLER CORP. CRUISE CONTROL SYSTEMS»(ref-123662) (for Dakota)
  4. «CHRYSLER CORP. CRUISE CONTROL SYSTEMS»(ref-123663) (for Ram Pickup)
  5. «CHRYSLER CORP. CRUISE CONTROL SYSTEMS»(/dodge/ram-wagon-b3500/1991-2000/remont/cruise-control-systems/#cruise-control-system) (for Ram Van/Wagon)

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

  1. Using scan tool, erase DTCs. Turn ignition off then on. Attempt to start engine. If necessary, crank engine for up to 10 seconds. Read and record DTCs using scan tool. If scan tool displays NO CRANK REFERENCE SIGNAL AT PCM, go to step 6).
  2. If scan tool does not display NO CRANK REFERENCE SIGNAL AT PCM, condition required to set DTC is not present at this time. NO CRANK REFERENCE SIGNAL AT PCM DTC sets if Powertrain Control Module (PCM) does not see a crank signal with cam signal present.
  3. Possible causes are: open or shorted 8-volt power supply circuit (Orange wire) to Crankshaft Position (CKP) sensor, open or shorted CKP sensor signal circuit (Gray/Black wire), open sensor ground circuit (Black/Light Blue wire), improperly adjusted sensor, failed sensor, or failed PCM. Go to next step.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, start engine. Wiggle wiring harness from CKP sensor to PCM. If engine misses or stalls, repair wiring harness where wiggling caused problem to occur. Perform TEST VER-2.
  5. Condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Using scan tool in ohmmeter mode, check resistance of CKP sensor connector, 8-volt power supply circuit (Orange wire). If resistance is less than 5 ohms, repair short to ground in Orange wire. Perform TEST VER-2.
  7. If resistance is more than 5 ohms, turn ignition on. Using scan tool in voltmeter mode, check voltage on CKP sensor connector, 8-volt power supply circuit (Orange wire). If voltage is less than 7 volts, go to TEST TC-2B.
  8. If voltage is more than 7 volts, connect a jumper wire to CKP sensor connector, CKP sensor signal circuit (Gray/Black wire). Using scan tool, read DTCs. Turn ignition switch to OFF position, then to ON position. While observing scan tool display, tap other lead of jumper to CKP sensor connector, sensor ground circuit (Black/Light Blue wire).
  9. If scan tool displays NO CAM SYNC SIGNAL AT PCM, replace CKP sensor. Perform TEST VER-2. 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, sensor ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  10. If resistance is less than 5 ohms, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  11. If connector is okay, use an external ohmmeter to check resistance of CKP sensor signal circuit (Gray/Black wire) between PCM connector terminal No. 24 and CKP sensor connector. If resistance is more than 5 ohms, repair open in Gray/Black wire. Perform TEST VER-2.
  12. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, 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 Gray/Black wire or Gray/Violet wire. Perform TEST VER-2.
  13. Using scan tool, read Distributorless Ignition System (DIS) signal status. If scan tool displays NO SIGNAL or CAM ONLY, go to step 17). If scan tool displays CRANK ONLY, go to TEST TC-3A. If scan tool does not display CRANK ONLY, condition required to set DTC is not present at this time. Go to next step.
  14. NO CRANK REFERENCE SIGNAL AT PCM DTC sets if Powertrain Control Module (PCM) does not see a Crankshaft Position (CKP) sensor signal with Camshaft Position (CMP) sensor signal present. Possible causes are: failed CKP sensor, open or shorted CKP sensor signal circuit (Gray/Violet wire), open or shorted CKP sensor 8-volt supply circuit (Orange wire), open CKP sensor ground circuit (Black/Light Blue wire), improperly adjusted CKP sensor, failed Powertrain Control Module (PCM) or failed Transmission Control Module (TCM). Go to next step.
  15. 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.
  16. Start engine. Wiggle wiring harness from CKP sensor to Powertrain Control Module (PCM). If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see «INACTIVE DTC CONDITION»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__inactive-dtc-condition) . Perform TEST VER-2.
  17. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Turn ignition on. 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. If voltage is more than 7 volts, turn ignition off.
  18. Connect a jumper wire between signal circuit (Gray/Violet wire) and ground circuit (Black/Light Blue wire) on CKP sensor connector harness side. Using scan tool, read DIS signal status. Make and break connection at CKP sensor connector several times while observing scan tool.
  19. If scan tool does not display CRANK ONLY, go to next step. If scan tool displays CRANK ONLY, remove CKP sensor. Inspect flywheel for damage. If flywheel is okay, replace CKP sensor. Perform TEST VER-2. If flywheel is damaged, repair as necessary. Perform TEST VER-2.
  20. 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 in Black/Light Blue wire. Perform TEST VER-2.
  21. If resistance is less than 5 ohms, disconnect PCM connector. Inspect PCM sensor connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  22. Using an external ohmmeter, check resistance of signal circuit (Gray/Violet wire) between CKP sensor connector harness side and PCM connector terminal No. 24. If resistance is more than 5 ohms, repair open in signal circuit Gray/Violet wire. Perform TEST VER-2.
  23. If resistance is less than 5 ohms, Using scan tool in ohmmeter mode, check resistance of CKP sensor connector, signal circuit (Gray/Violet wire). If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
  24. If resistance is less than 5 ohms, disconnect Transmission Control Module (TCM) connector. Using scan tool, check resistance of CKP sensor connector, signal circuit (Gray/Violet wire). If resistance is more than 5 ohms, replace TCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Gray/Violet wire. Perform TEST VER-2.

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

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

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

  1. Using scan tool, erase DTCs. Attempt to start engine. If necessary, crank engine for up to 10 seconds. Using scan tool, read DTCs. Record scan tool DTCs. If scan tool displays NO CAM SYNC SIGNAL AT PCM, go to step 6).
  2. If scan tool does not display NO CAM SYNC SIGNAL AT PCM, condition required to set DTC is not present at this time. NO CAM SYNC SIGNAL AT PCM DTC sets if Powertrain Control Module (PCM) does not see a cam signal with crank signal present.
  3. Possible causes are: open or shorted 8-volt power supply circuit (Orange wire) to Camshaft Position (CMP) sensor, open or shorted CMP sensor signal circuit (Tan/Yellow wire), open sensor ground circuit (Black/Light Blue wire), improperly adjusted sensor, failed sensor, or failed PCM. Go to next step.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  5. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. Using scan tool in voltmeter mode, check voltage on CMP sensor connector, 8-volt power supply circuit (Orange wire). If voltage is less than 7 volts, repair open Orange wire. Perform TEST VER-2.
  7. If voltage is more than 7 volts, connect a jumper wire to CMP sensor connector, CMP sensor signal circuit (Tan/Yellow wire). Tap other lead of jumper to CMP sensor connector, sensor ground circuit (Black/Light Blue wire). Without turning ignition switch to OFF position, attempt to start engine.
  8. If engine starts, replace CMP sensor. Perform TEST VER-2. If engine does not start, turn ignition off. Go to next step. NOTE: Following step will require help of an assistant.
  9. If resistance is less than 5 ohms, remove distributor cap. Observe rotor while an assistant cranks engine. If rotor does not turn, repair distributor as necessary. Perform TEST VER-2.
  10. If rotor turns, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CMP sensor connector, sensor ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  11. If resistance is less than 5 ohms, disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  12. If connector is okay, use an external ohmmeter to check resistance of CMP sensor signal circuit (Tan/Yellow wire) between PCM connector terminal No. 44 and CMP sensor connector. If resistance is more than 5 ohms, repair open in Tan/Yellow wire. Perform TEST VER-2.
  13. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of PCM connector terminal No. 44, CMP sensor signal circuit (Tan/Yellow 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 Tan/Yellow wire. Perform TEST VER-2.
  14. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. turn ignition on. Using scan tool in voltmeter mode, check voltage on Camshaft Position (CMP) sensor connector, 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, repair open Orange wire. Perform TEST VER-2.
  15. If voltage is more than 7 volts, turn ignition off. Connect a jumper wire between signal circuit (Tan/Yellow wire) and ground circuit (Black/Light Blue wire) on CMP sensor connector harness side. Using scan tool, read Distributorless Ignition System (DIS) signal status. Make and break connection at CMP sensor connector several times while observing scan tool.
  16. If scan tool does not display CAM ONLY, go to next step. If scan tool displays CAM ONLY, turn ignition off. Remove CMP sensor. Inspect cam sprocket. If cam sprocket is okay, replace CMP sensor. Perform TEST VER-2. If cam sprocket is damaged, repair as necessary. Perform TEST VER-2.
  17. Turn ignition off. Put scan tool in ohmmeter mode. Check resistance of CMP sensor connector, ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  18. If resistance is less than 5 ohms, disconnect PCM connector. Inspect PCM sensor connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  19. Using an external ohmmeter, check resistance of 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 in Tan/Yellow wire. Perform TEST VER-2.
  20. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of CMP sensor connector, signal circuit (Tan/Yellow 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 Tan/Yellow wire. Perform TEST VER-2.

TEST TC-4A - NO CHANGE IN MAP FROM START TO RUN (DTC 13)

  1. Turn ignition on. Using scan tool, read DTCs. 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, using scan tool, erase DTCs. Start engine, and allow it to idle for 30 seconds. Using scan tool, read DTCs. If scan tool displays NO CHANGE IN MAP FROM START TO RUN, go to step 8).
  2. If scan tool does not display NO CHANGE IN MAP FROM START TO RUN with engine still running, set engine speed to 1500 RPM using scan tool. Observe scan tool Manifold Absolute Pressure (MAP) sensor voltage while wiggling wiring harness from MAP sensor to Powertrain Control Module (PCM).
  3. If engine stalls or voltage becomes erratic, repair defective wiring harness or connector between MAP sensor and PCM. Perform TEST VER-2. Using scan tool, stop actuation test. Observe scan tool display and snap throttle open and closed.
  4. If vacuum did not drop rapidly to less than one in. Hg, go to step 7). If vacuum dropped rapidly to less than one in. Hg, condition required to set DTC is not present at this time.
  5. NO CHANGE IN MAP FROM START TO RUN DTC sets if too small a difference is seen between barometric pressure at key on and manifold vacuum after start-up.
  6. Possible causes are restricted or leaking passage to MAP sensor, ice in sensor or passage, and failed sensor. Test is complete. Perform TEST VER-2.
  7. Remove and inspect MAP sensor vacuum connector. Repair restriction or open in connector as necessary. Perform TEST VER-2. If connector is okay, replace MAP sensor. Perform TEST VER-2.
  8. Turn engine off. Install a vacuum gauge into Manifold Absolute Pressure (MAP) sensor vacuum supply. Start engine. Operate engine at idle and read vacuum gauge. If reading is zero at idle, repair vacuum signal to MAP sensor. Perform TEST VER-2. If reading is not zero, observe vacuum gauge and snap throttle open and closed.
  9. If vacuum did not drop rapidly to less than one in. Hg, repair restricted vacuum signal. Perform TEST VER-2. If vacuum dropped rapidly to less than one in. Hg, turn ignition off. Disconnect and inspect MAP sensor connector. Repair as necessary. Turn ignition on.
  10. Using scan tool in voltmeter mode, check voltage on MAP sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is less than 4 volts, repair Violet/White wire. Perform TEST VER-2. If voltage is more than 4 volts, replace MAP sensor. Perform TEST VER-2.
  11. Using scan tool, erase DTCs. Start engine. Allow engine to idle for 30 seconds. With engine running, use scan tool to read DTCs. If scan tool does not display NO CHANGE IN MAP FROM START TO RUN, go to step 14).
  12. If scan tool displays NO CHANGE IN MAP FROM START TO RUN, turn ignition off. Disconnect Manifold Absolute Pressure (MAP) sensor connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector, 5-volt supply circuit (Violet/White wire).
  13. If voltage is less than 4 volts, repair open or short in Violet/White wire. Perform TEST VER-2. If voltage is more than 4 volts, remove MAP sensor vacuum hose. Inspect condition of MAP sensor vacuum hose. If MAP sensor vacuum hose is restricted or open, replace vacuum hose as necessary. Perform TEST VER-2. If MAP sensor vacuum hose is okay, replace MAP sensor. Perform TEST VER-2.
  14. Using scan tool, set engine speed to 1500 RPM. With engine running at 1500 RPM, read scan tool MAP sensor voltage. While monitoring MAP sensor voltage, wiggle MAP sensor connector and wiring harness.
  15. If engine stalled or MAP sensor voltage became erratic, inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If engine did not stall and MAP sensor voltage did not become erratic, snap throttle open and closed while monitoring scan tool.
  16. If engine vacuum did not rapidly drop to less than one in. Hg, go to step 18). If engine vacuum rapidly dropped to less than one in. Hg, condition required to set DTC is not present at this time. Go to next step.
  17. NO CHANGE IN MAP FROM START TO RUN DTC sets if too small a difference is seen between barometric pressure at key on and manifold vacuum after engine start. Possible causes are: restricted or leaking vacuum/pressure hose to MAP sensor, ice in MAP sensor or passage, or MAP sensor failure. Perform TEST VER-2.
  18. Remove MAP sensor vacuum hose. Inspect condition of MAP sensor vacuum hose. If vacuum hose is restricted or open, replace vacuum hose as necessary. Perform TEST VER-2. If vacuum hose is okay, replace MAP sensor. Perform TEST VER-2.

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

  1. Start engine. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If MAP sensor voltage is less than .2 volt, go to step 6). If MAP sensor voltage is more than .2 volt, turn ignition switch to ON position leaving engine off. Using scan tool, read MAP sensor voltage. If MAP sensor voltage is less than 1.2 volts, go to step 6).
  2. If MAP sensor voltage is more than 1.2 volts, observe scan tool voltage display while wiggling MAP sensor connector and wiring harness. If any MAP sensor voltage change occurs, repair defective wiring harness or MAP sensor connector. Perform TEST VER-2.
  3. If no change occurs in MAP sensor voltage, condition required to set DTC is not present at this time. MAP SENSOR VOLTAGE TOO LOW DTC sets if MAP sensor output voltage is less than 1.2 volts at start or less than .2 volt with engine running, engine speed 400-1500 RPM, and Throttle Position (TP) sensor voltage less than one volt. Possible causes are: short to ground in MAP sensor signal circuit (Dark Green/Red wire), sensor shorted internally, or loss of 5-volt power supply. Go to next step.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  5. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Turn ignition switch to ON position leaving engine off. Disconnect and inspect MAP sensor connector. Repair as necessary. Read MAP sensor voltage using scan tool. If MAP sensor voltage is more than 4 volts, replace MAP sensor. Perform TEST VER-2. If MAP sensor voltage is less than 4 volts, put scan tool in voltmeter mode.
  7. Using scan tool, 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. If voltage is more than 4 volts, turn ignition off.
  8. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  9. If connector is okay, use an external ohmmeter to check resistance of MAP sensor signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire) of MAP sensor connector. If resistance is less than 5 ohms, repair Dark Green/Red wire shorted to Black/Light Blue wire. Perform TEST VER-2.
  10. If resistance is more than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of MAP sensor connector, MAP sensor signal circuit (Dark Green/Red wire). If resistance is less than 5 ohms, repair short to ground in Dark Green/Red 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)

  1. Start engine. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If voltage is more than 4.6 volts, go to step 5). If voltage is less than 4.6 volts, observe scan tool voltage display while wiggling MAP sensor connector and wiring harness. If any MAP sensor voltage change occurs, repair defective wiring harness or MAP sensor connector. Perform TEST VER-2.
  2. If no change occurs in MAP sensor voltage, condition required to set DTC is not present at this time. MAP SENSOR VOLTAGE TOO HIGH DTC sets if MAP sensor output voltage is more than 4.6 volts at start-up or with engine running, engine speed 400-1500 RPM, and Throttle Position (TP) sensor voltage less than one volt. Possible causes are open or short to voltage in MAP sensor signal circuit (Dark Green/Red wire), sensor open internally, and open sensor ground circuit (Black/Light Blue wire). Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Turn ignition switch to ON position, leaving engine off. Disconnect and inspect MAP sensor connector. Repair as necessary. Connect a jumper wire between MAP sensor connector, MAP sensor signal circuit (Dark Green/Red wire) and sensor ground circuit (Black/Light Blue wire). Using scan tool, read MAP sensor voltage.
  6. If scan tool displays NO RESPONSE, repair short from Dark Green/Red wire to Violet/White wire. Perform TEST VER-2. If MAP sensor voltage is less than one volt, replace MAP sensor. Perform TEST VER-2. If MAP sensor voltage is more than one volt, disconnect jumper lead from MAP sensor connector, sensor ground circuit (Black/Light Blue wire), and reconnect lead to engine ground. Using scan tool, read MAP sensor voltage.
  7. If MAP sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If MAP sensor voltage is more than one volt, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  8. If connector is okay, use external ohmmeter to check resistance of MAP sensor signal circuit (Dark Green/Red wire) between PCM connector terminal No. 1 and MAP sensor connector. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Dark Green/Red wire. Perform TEST VER-2.

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

  1. Raise vehicle on a hoist so wheels are free to spin. Start engine. Using scan tool, read Vehicle Speed Sensor (VSS) signal. Put transmission in Drive. If scan tool displays zero MPH, go to step 5). If scan tool displays more than zero MPH, condition required to set DTC is not present at this time.
  2. NO VEHICLE SPEED SENSOR SIGNAL DTC sets if Powertrain Control Module (PCM) does not see a speed signal on terminal No. 47 under road load conditions. Possible causes are: open or shorted VSS signal circuit (White/Orange wire), open 8-volt power supply circuit (Orange wire), open sensor ground circuit (Black/Light Blue wire), failed sensor, failed PCM, or failed Daytime Running Lights (DRL) module (if equipped).
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Turn ignition off. Disconnect and inspect Vehicle Speed Sensor (VSS) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  6. If connector is okay, turn ignition on. Using scan tool in voltmeter mode, check voltage on VSS connector, 8-volt power supply circuit (Orange wire). If voltage is less than 7 volts, repair open in Orange wire. Perform TEST VER-2. If voltage is more than 7 volts, check voltage on VSS connector, VSS signal circuit (White/Orange wire) using scan tool.
  7. If voltage is less than 4 volts, go to TEST TC-7B. If voltage is more than 4 volts, connect a jumper wire to VSS connector, VSS signal circuit (White/Orange wire). Using scan tool, read VSS signal. While observing scan tool display, tap other lead of jumper to VSS connector, sensor ground circuit (Black/Light Blue wire).
  8. If scan tool does not display more than zero MPH, go to TEST TC-7B. If scan tool displays more than zero MPH, remove speed sensor. Inspect speedometer pinion gear. Repair as necessary. Perform TEST VER-2. If pinion gear is okay, replace VSS. Perform TEST VER-2.
  9. 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 12).
  10. Condition required to set DTC is not present at this time. NO VEHICLE SPEED SENSOR SIGNAL DTC sets if Powertrain Control Module (PCM) does not see a VSS signal at PCM terminal No. 47 (White/Orange wire) under road load conditions. Possible causes are: open or shorted VSS signal circuit (White/Orange wire), no signal from Transmission Control Module (TCM) or failed PCM. Go to next step.
  11. 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 DTC CONDITION»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__inactive-dtc-condition) . Perform TEST VER-2.
  12. Using scan tool, read Electronic Automatic Transmission (EATX) DTCs. If Code(s) 50-58 is displayed. If Code(s) 50-58 is not displayed, turn ignition off.
  13. Disconnect Transmission Control Module (TCM) connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on TCM connector terminal No. 58, Vehicle Speed Sensor (VSS) signal circuit (White/Orange wire). If voltage is more than 4 volts, go to step 17).
  14. If voltage is less than 4 volts, 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.
  15. Using an external ohmmeter, check resistance of signal circuit (White/Orange wire) between TCM connector terminal No. 58 and PCM connector terminal No. 47. If resistance is more than 5 ohms, repair open in White/Orange wire. Perform TEST VER-2.
  16. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 47, signal circuit (White/Orange wire). If resistance is less than 5 ohms, repair short to ground in White/Orange wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
  17. Using scan tool, read vehicle speed. Connect a jumper wire to TCM connector terminal No. 58 (White/Orange wire). While observing scan tool display, tap other end of jumper wire to ground. If scan tool displayed vehicle speed more than zero MPH, replace TCM. Perform TEST VER-2.
  18. If scan tool did not display more than zero MPH, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of signal circuit (White/Orange wire) between TCM connector terminal No. 58 and PCM connector terminal No. 47.
  19. If resistance is less than 5 ohms, replace PCM. If resistance is more than 5 ohms, repair open in White/Orange wire. Perform TEST VER-2.

TEST TC-7B - NO VEHICLE SPEED SENSOR SIGNAL

  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 in 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 and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  3. If connector is okay, use an external ohmmeter to check resistance of VSS signal circuit (White/Orange wire) between PCM connector terminal No. 647 and VSS connector. If resistance is more than 5 ohms, repair open in White/Orange wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of PCM connector terminal No 47, VSS signal circuit (White/Orange wire). If resistance is less than 5 ohms, repair short to ground in White/Orange wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

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

  1. Start engine. Apply parking brake. Allow engine to reach normal operating temperature. Using scan tool, set engine speed to 1500 RPM and read Oxygen Sensor (O2S) state. If O2S is locked at center, go to step 6). If O2S is not locked at center, observe scan tool display while wiggling O2S connector and wiring harness.
  2. If O2S at any time locked at center, repair defective wiring harness or O2S connector. Perform TEST VER-2. NOTE: An intermittent open O2S signal circuit (Black/Dark Green wire) will cause this condition.
  3. If O2S did not lock at center, condition required to set DTC is not present at this time. O2S STAYS AT CENTER DTC sets if O2S output voltage stays at .5 volt for 1.5 minutes with engine temperature more than 170°F and engine running for 2 minutes. Possible causes are open O2S signal circuit (Black/Dark Green wire) or failed sensor.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  5. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Turn ignition off. Disconnect and inspect O2S connector. Repair as necessary. Using scan tool in ohmmeter mode, check resistance of O2S connector, sensor ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  7. If resistance is less than 5 ohms, connect a jumper wire between O2S connector, O2S signal circuit (Black/Dark Green wire) and positive battery post. Turn ignition on. Using scan tool in voltmeter mode, read O2S voltage. If voltage is more than one volt, replace O2S. Perform TEST VER-2. If voltage is less than one volt, turn ignition off.
  8. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  9. If connector is okay, disconnect jumper wire. Using an external ohmmeter, check resistance of O2S signal circuit (Black/Dark Green wire) between PCM connector terminal No. 41 and O2S connector. If resistance is more than 5 ohms, repair open in Black/Dark Green wire or Dark Green/White wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-9A - O2S STAYS ABOVE CENTER (RICH) (DTC 52)

  1. Start engine and apply parking brake. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read Oxygen Sensor (O2S) voltage. If O2S voltage is less than .5 volt, condition required to set DTC is not present at this time. Go to next step.
  2. O2S STAYS ABOVE CENTER (RICH) DTC sets if O2S signal stays more than .5 volt, but less than 1.2 volts, without changing for more than 8 minutes. Possible causes are high fuel pressure, other engine sensor calibrations, failed ignition system, failed sensor, and fuel contamination. Go to TEST NTC-1A.
  3. If O2S voltage is more than .5 volt, check for tracking from O2S connector, 12-volt ignition feed (heater) circuit (Dark Green/Orange wire) to O2S signal circuit (Black/Dark Green wire). Go to next step.
  4. Check O2S connectors for excessive dirt and grease build-up. If there is excessive dirt and grease build-up, clean and repair connector(s) as necessary. Perform TEST VER-2. If no excessive dirt or grease build-up is present, a condition causing engine to run rich is indicated. Go to TEST NTC-1A.
  5. If voltage is not always more than .5 volt, condition required to set DTC is not present at this time. Go to next step. If voltage is always more than .5 volt, go to step 7).
  6. 02S STAYS ABOVE CENTER (RICH) DTC sets if O2S output voltage stays at more than .5 volt, but less than 1.2 volts, without changing for more than 8 minutes. Possible causes are: high fuel pressure, other engine sensor calibration failures, ignition system failure, O2S failure or fuel contamination. Go to TEST NTC-1A.
  7. Using scan tool, stop all actuation tests. Turn ignition off. Inspect air cleaner filter and inlet ducts for restrictions. If restrictions are present, repair as necessary. Perform TEST VER-2. If restrictions are not present, remove upper half of intake manifold.
  8. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) fuel system test. Inspect all injectors for leakage. If injectors are leaking, stop ASD fuel system test. Release fuel pressure. Replace leaking fuel injectors as necessary. Perform TEST VER-2.
  9. If injectors are not leaking, using scan tool, stop ASD fuel system test. A condition causing engine to run rich is present. Go to step 6).

TEST TC-10A - O2S STAYS BELOW CENTER (LEAN) (DTC 51)

  1. Start engine and apply parking brake. Allow engine to reach normal operating temperature. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read Oxygen Sensor (O2S) voltage. If O2S voltage is more than .5 volt, condition required to set DTC is not present at this time. Go to next step. If O2S voltage is zero volts, go to step 5). If O2S voltage is less than .5 but more than zero volts, go to step 3).
  2. O2S STAYS BELOW CENTER (LEAN) DTC sets if O2S signal stays less than .5 volt without changing for more than 8 minutes. Possible causes are major vacuum leak, low fuel pressure, other engine sensor calibrations, failed ignition system, failed sensor, and fuel contamination. Go to TEST NTC-1A.
  3. Check for tracking from O2S connector, O2S signal circuit (Black/Dark Green wire) to sensor ground circuit (Black/Light Blue wire). Go to next step.
  4. Check O2S connectors for excessive dirt and grease build-up. If there is excessive dirt and grease build-up, clean and repair connector(s) as necessary. Perform TEST VER-2. If no excessive dirt or grease build-up is present, a condition causing engine to run lean is indicated. Go to TEST NTC-1A.
  5. Using scan tool, stop actuation tests. Turn ignition switch to ON position, leaving engine off. Disconnect and inspect O2S connector. Repair as necessary. Using scan tool, read O2S voltage. If O2S voltage is .5 volt, replace O2S. Perform TEST VER-2. If O2S voltage is not .5 volt, turn ignition off.
  6. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  7. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of O2S connector, O2S signal circuit (Black/Dark Green wire). If resistance is less than 5 ohms, repair short to ground in Black/Dark Green wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
  8. Start engine. Allow engine to run until normal operating temperature is reached. Using scan tool, set engine speed to 1500 RPM and read O2S voltage. If voltage is not always less than .5 volt, condition required to set DTC is not present at this time. Stop all tests and go to next step. If voltage is always less than .5 volt, go to step 10).
  9. 02S STAYS BELOW CENTER (LEAN) DTC sets if O2S output voltage stays at less than .5 volt without changing 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 fuel contamination. Go to TEST NTC-1A.
  10. Using scan tool, check if O2S voltage is always zero volts. If O2S voltage is always zero volts, go to next step. If O2S voltage is not always zero volts, a condition causing engine to run lean is present. Go to TEST NTC-1A.
  11. Using scan tool, stop all actuation tests. Turn ignition on with engine off. Disconnect O2S connector. Using scan tool, read O2S state. If O2S state is at center, replace O2S. Perform TEST VER-2.
  12. If O2S state is not at center, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of O2S connector (harness side), signal circuit (Dark Green/White wire).
  13. If resistance is less than 5 ohms, repair short to ground in Dark Green/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-11A - O2S SHORTED TO VOLTAGE (DTC 21)

  1. Using scan tool, read Oxygen Sensor (O2S) voltage. If O2S voltage is more than 1.2 volts, go to step 5). If O2S voltage is less than 1.2 volts, observe scan tool voltage display while wiggling O2S connector and wiring harness. If O2S voltage is more than 1.2 volts at any time, repair short to voltage in wiring harness or O2S connector. Perform TEST VER-2.
  2. If O2S voltage remains less than 1.2 volts, condition required to set DTC is not present at this time. O2S SHORTED TO VOLTAGE DTC sets if O2S signal circuit (Black/Dark Green wire) voltage goes to more than 1.2 volts. Possible causes are: short to another circuit in O2S signal circuit (Black/Dark Green wire), dirty or wet connection causing voltage tracking in connector, or failed sensor. Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect O2S connector. Repair as necessary. Using scan tool, read O2S voltage. If O2S voltage is less than 1.2 volts, replace O2S. Perform TEST VER-2. If O2S voltage is more than 1.2 volts, repair short to battery voltage in Black/Dark Green wire or Dark Green/White wire. Perform TEST VER-2.

TEST TC-12A - IDLE ADAP MEM AT LEAN LIMIT OR IDLE ADAP MEM AT RICH LIMIT (DTC 52)

  1. IDLE ADAP MEM AT LEAN LIMIT or IDLE ADAP MEM AT RICH LIMIT DTCs can be caused by several conditions not related to Powertrain Control Module (PCM) electronics. Idle adaptive memory is designed to aid in fuel/air control. Idle adaptive memory function is to adapt fuel/air mixture to correct for fuel pressure differences and other mechanical changes, such as engine wear and mechanical malfunctions.
  2. Idle adaptive memory affects Oxygen Sensor (O2S) system by causing fuel control system to go to open loop mode when O2S has indicated a continuous lean or rich mixture of exhaust gas. If engine is running rich, PCM adapts fuel/air mixture lean. If engine is running lean, PCM adapts fuel/air mixture rich. Possible causes are excessive engine wear, incorrect fuel pressure, and mechanical malfunctions.

TEST TC-13A - THROTTLE POSITION SENSOR VOLTAGE LOW (DTC 24)

  1. Using scan tool, read Throttle Position (TP) sensor voltage. If TP sensor voltage is less than .2 volt, go to step 6). If TP sensor voltage is more than .2 volt, slowly open and close throttle while observing scan tool display. If voltage change is not smooth, replace TP sensor. Perform TEST VER-2.
  2. If voltage change is smooth, observe scan tool voltage display while wiggling TP sensor connector and wiring harness. If any TP sensor voltage change occurs, repair defective wiring harness or MAP sensor connector. Perform TEST VER-2.
  3. If no change occurs in TP sensor voltage, condition required to set DTC is not present at this time. THROTTLE POSITION SENSOR VOLTAGE LOW DTC sets if TP sensor signal circuit (Orange/Dark Blue wire) voltage goes to less than .2 volt, or if MPH is more than 20, engine speed is more than 1500 RPM, and vacuum is less than 2 in. Hg with TP sensor voltage less than .5 volt. Possible causes are short to ground in TP sensor signal circuit (Orange/Dark Blue wire), failed sensor and loss of 5-volt power supply.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, condition that initially set DTC message has just been simulated. Perform following additional checks to assist in identifying a possible intermittent problem.
  5. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Disconnect and inspect TP sensor connector. Repair as necessary. Using scan tool, read TP sensor voltage. If TP sensor voltage is more than one volt, replace TP sensor. Perform TEST VER-2. If TP sensor voltage is less than one volt, put scan tool in voltmeter mode. Using scan tool, check voltage on TP sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is less than 4 volts, repair open in Violet/White wire. Perform TEST VER-2.
  7. If voltage is more than 4 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  8. If connector is okay, use an external ohmmeter to check resistance between TP sensor connector signal circuit (Orange/Dark Blue wire) and sensor ground circuit (Black/Light Blue wire). If resistance is less than 5 ohms, repair Orange/Dark Blue wire or Dark Blue wire shorted to Black/Light Blue wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of TP sensor connector, TP sensor signal circuit (Orange/Dark Blue wire). If resistance is less than 5 ohms, repair short to ground in Orange/Dark Blue wire or Dark Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-14A - THROTTLE POSITION SENSOR VOLTAGE HIGH (DTC 24)

  1. Using scan tool, read Throttle Position (TP) sensor voltage. If TP sensor voltage is more than 4.5 volts, go to step 6). If TP sensor voltage is less than 4.5 volts, slowly open and close throttle while observing scan tool display. If voltage change is erratic, replace TP sensor. Perform TEST VER-2.
  2. If voltage change is not erratic, observe scan tool voltage display while wiggling TP sensor connector and wiring harness. If any TP sensor voltage change occurs, repair defective wiring harness or MAP sensor connector. Perform TEST VER-2.
  3. If no change occurs in TP sensor voltage, condition required to set DTC is not present at this time. THROTTLE POSITION SENSOR VOLTAGE HIGH DTC sets if TP sensor signal circuit (Orange/Dark Blue wire) voltage goes to more than 4.5 volts. Possible causes are: open or short to voltage in TP sensor signal circuit (Orange/Dark Blue wire), open in sensor ground circuit (Black/Light Blue wire), or failed sensor. Go to next step.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  5. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Disconnect and inspect TP sensor connector. Repair as necessary. Connect a jumper wire between TP sensor connector, TP sensor signal circuit (Orange/Dark Blue wire) and sensor ground circuit (Black/Light Blue wire). Using scan tool, read TP sensor voltage.
  7. If scan tool displays NO RESPONSE, repair Orange/Dark Blue wire or Dark Blue wire for a short to Violet/White wire. Perform TEST VER-2. If TP sensor voltage is less than one volt, replace TP sensor. Perform TEST VER-2. If TP sensor voltage is more than one volt, disconnect jumper lead from TP sensor connector, sensor ground circuit (Black/Light Blue wire), and reconnect lead to engine ground. Using scan tool, read TP sensor voltage.
  8. If TP sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If TP sensor voltage is more than one volt, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  9. If connector is okay, use an external ohmmeter to check resistance of TP sensor signal circuit (Orange/Dark Blue wire) between PCM connector terminal No. 22 and TP sensor connector. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Orange/Dark Blue wire or Dark Blue wire. Perform TEST VER-2.

TEST TC-15A - ECT SENSOR VOLTAGE TOO LOW (DTC 22)

  1. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If ECT sensor voltage is less than .5 volt, go to step 5). If ECT sensor voltage is more than .5 volt, observe scan tool voltage display while wiggling ECT sensor connector and wiring harness. If any ECT sensor voltage change occurs, repair defective wiring harness or ECT sensor connector. Perform TEST VER-2.
  2. If no change occurs in ECT sensor voltage, condition required to set DTC is not present at this time. ECT SENSOR VOLTAGE TOO LOW DTC sets if ECT sensor signal circuit (Tan/Black wire) voltage goes to less than .5 volt. Possible causes are: short to ground in ECT sensor signal circuit (Tan/Black wire) or sensor shorted internally. Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect ECT sensor connector. Repair as necessary. Using scan tool, read ECT sensor voltage. If ECT sensor voltage is more than 4 volts, replace ECT sensor. Perform TEST VER-2. If ECT sensor voltage is less than 4 volts, turn ignition off.
  6. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  7. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of ECT sensor connector, ECT sensor signal circuit (Tan/Black wire). If resistance is less than 5 ohms, repair short to ground in Tan/Black wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-16A - ECT SENSOR VOLTAGE TOO HIGH (DTC 22)

  1. Using scan tool, read Engine Coolant Temperature (ECT) sensor voltage. If voltage is more than 4.5 volts, go to step 5). If voltage is less than 4.5 volts, observe scan tool voltage display while wiggling ECT sensor connector and wiring harness. If any ECT sensor voltage change occurs, repair defective wiring harness or ECT sensor connector. Perform TEST VER-2.
  2. If no change occurs in ECT sensor voltage, condition required to set DTC is not present at this time. ECT SENSOR VOLTAGE TOO HIGH DTC sets if ECT sensor signal circuit (Tan/Black wire) voltage goes to more than 4.9 volts. Possible causes are: open in ECT sensor signal circuit (Tan/Black wire), open in sensor ground circuit (Black/Light Blue wire), or sensor open internally. Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect ECT sensor connector. Repair as necessary. Connect a jumper wire between ECT sensor connector, ECT sensor signal circuit (Tan/Black wire) and sensor ground circuit (Black/Light Blue wire). Using scan tool, read ECT sensor voltage.
  6. If ECT sensor voltage is less than one volt, replace ECT sensor. Perform TEST VER-2. If ECT sensor voltage is more than one volt, disconnect jumper lead from ECT sensor connector, sensor ground circuit (Black/Light Blue wire), and reconnect lead to engine ground. Using scan tool, read ECT sensor voltage.
  7. If ECT sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If ECT sensor voltage is more than one volt, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  8. If connector is okay, use an external ohmmeter to check resistance of ECT sensor signal circuit (Tan/Black wire) between PCM connector terminal No. 2 and ECT sensor connector. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Tan/Black wire. Perform TEST VER-2.

TEST TC-17A - INTAKE AIR TEMP SENSOR VOLTAGE LOW (DTC 23)

  1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If IAT sensor voltage is less than .5 volt, go to step 5). If IAT sensor voltage is more than .5 volt, observe scan tool voltage display while wiggling IAT sensor connector and wiring harness. If any IAT sensor voltage change occurs, repair defective wiring harness or IAT sensor connector. Perform TEST VER-2.
  2. If no change occurs in IAT sensor voltage, condition required to set DTC is not present at this time. INTAKE AIR TEMP SENSOR VOLTAGE LOW DTC sets if IAT sensor signal circuit (Black/Red wire) voltage goes to less than .5 volt. Possible causes are: short to ground in IAT sensor signal circuit (Black/Red wire) or sensor shorted internally.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect IAT sensor connector. Repair as necessary. Using scan tool, read IAT sensor voltage. If IAT sensor voltage is more than 4 volts, replace IAT sensor. Perform TEST VER-2. If IAT sensor voltage is less than 4 volts, turn ignition off.
  6. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  7. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of IAT sensor connector, IAT sensor 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-18A - INTAKE AIR TEMP SENSOR VOLTAGE HIGH (DTC 23)

  1. Using scan tool, read Intake Air Temperature (IAT) sensor voltage. If IAT sensor voltage is more than 4.5 volts, go to step 5). If IAT sensor voltage is less than 4.5 volts, observe scan tool voltage display while wiggling IAT sensor connector and wiring harness. If any IAT sensor voltage change occurs, repair defective wiring harness or IAT sensor connector. Perform TEST VER-2.
  2. If no change occurs in IAT sensor voltage, condition required to set DTC is not present at this time. INTAKE AIR TEMP SENSOR VOLTAGE HIGH DTC sets if IAT sensor signal circuit (Black/Red wire) voltage goes to more than 4.9 volts. Possible causes are: open in IAT sensor signal circuit (Black/Red wire), open in sensor ground circuit (Black/Light Blue wire), or sensor open internally. Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect IAT sensor connector. Repair as necessary. Connect a jumper wire between IAT sensor connector signal circuit (Black/Red wire) and ground circuit (Black/Light Blue wire). Using scan tool, read IAT sensor voltage.
  6. If IAT sensor voltage is less than one volt, replace IAT sensor. Perform TEST VER-2. If IAT sensor voltage is more than one volt, disconnect jumper lead from IAT sensor connector, sensor ground circuit (Black/Light Blue wire), and reconnect lead to engine ground. Using scan tool, read IAT sensor voltage.
  7. If IAT sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If IAT sensor voltage is more than one volt, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  8. If connector is okay, use an external ohmmeter to check resistance of IAT sensor signal circuit (Black/Red wire) between PCM connector terminal No. 21 and IAT sensor connector. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Black/Red wire. Perform TEST VER-2.

TEST TC-19A - CNG TEMP SENSOR VOLTAGE TOO LOW (DTC 64)

  1. Using scan tool, read Compressed Natural Gas (CNG) temperature sensor voltage. If CNG temperature sensor voltage is less than .5 volt, go to step 5). If CNG temperature sensor voltage is more than .5 volt, observe scan tool voltage display while wiggling CNG temperature sensor connector and wiring harness. If any CNG temperature sensor voltage change occurs, repair defective wiring harness or CNG temperature sensor connector. Perform TEST VER-2.
  2. If no change occurs in CNG temperature sensor voltage, condition required to set DTC is not present at this time. COMPRESSED NATURAL GAS TEMP SENSOR LOW DTC sets if CNG temperature sensor signal circuit (Tan/Pink wire) voltage goes to less than .5 volt. Possible causes are short to ground in CNG temperature sensor signal circuit (Tan/Pink wire) and failed sensor. Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect CNG temperature sensor connector. Repair as necessary. Using scan tool, read CNG temperature sensor voltage. If CNG temperature sensor voltage is more than 4 volts, replace CNG temperature sensor. Perform TEST VER-2. If CNG temperature sensor voltage is less than 4 volts, turn ignition off.
  6. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  7. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of CNG temperature sensor connector, CNG temperature sensor signal circuit (Tan/Pink wire). If resistance is less than 5 ohms, repair short to ground in Tan/Pink wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-20A - CNG TEMP SENSOR VOLTAGE TOO HIGH (DTC 64)

  1. Using scan tool, read Compressed Natural Gas (CNG) temperature sensor voltage. If CNG temperature sensor voltage is more than 4.5 volts, go to step 5). If CNG temperature sensor voltage is less than 4.5 volts or 4.6 volts, observe scan tool voltage display while wiggling CNG temperature sensor connector and wiring harness. If any CNG temperature sensor voltage change occurs, repair defective wiring harness or CNG temperature sensor connector. Perform TEST VER-2.
  2. If no change occurs in CNG temperature sensor voltage, condition required to set DTC is not present at this time. COMPRESSED NATURAL GAS TEMP SENSOR HIGH DTC sets if CNG temperature sensor signal circuit (Tan/Pink wire) voltage goes to more than 4.96 volts. Possible causes are open or short to battery voltage in CNG temperature sensor signal circuit (Tan/Pink wire) and failed sensor.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  4. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect CNG temperature sensor connector. Repair as necessary. Connect a jumper wire between CNG temperature sensor connector signal circuit (Tan/Pink wire) and ground circuit (Black/Light Blue wire). Using scan tool, read CNG temperature sensor voltage.
  6. If CNG temperature sensor voltage is less than one volt, replace CNG temperature sensor. Perform TEST VER-2. If CNG temperature sensor voltage is more than one volt, disconnect jumper lead from CNG temperature sensor connector, sensor ground circuit (Black/Light Blue wire), and reconnect lead to engine ground. Using scan tool, read CNG temperature sensor voltage.
  7. If CNG temperature sensor voltage is less than one volt, repair open in Black/Light Blue wire. Perform TEST VER-2. If CNG temperature sensor voltage is more than one volt, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  8. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of PCM connector terminal No. 42, CNG temperature sensor signal circuit (Tan/Pink wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is more than 5 ohms, repair open in Tan/Pink wire. Perform TEST VER-2.

TEST TC-21A - CNG PRESSURE SENSOR VOLTAGE TOO LOW (DTC 64)

  1. Using scan tool, erase DTCs. Turn ignition switch to OFF position for 10 seconds. Attempt to start engine and operate at idle. Using scan tool, read DTCs. If COMPRESSED NATURAL GAS PRESSURE LOW DTC returns, go to step 7).
  2. If COMPRESSED NATURAL GAS PRESSURE LOW DTC does not turn, observe scan tool voltage display while wiggling Compressed Natural Gas (CNG) low pressure sensor connector and wiring harness. If any CNG low pressure sensor voltage change occurs, repair defective wiring harness or CNG low pressure sensor connector. Perform TEST VER-2.
  3. If no change occurs in CNG low pressure sensor voltage, read DTCs using scan tool. If COMPRESSED NATURAL GAS PRESSURE LOW DTC returns, repair defective wiring harness or CNG low pressure sensor connector. Perform TEST VER-2.
  4. If COMPRESSED NATURAL GAS PRESSURE LOW DTC does not return, condition required to set DTC is not present at this time. COMPRESSED NATURAL GAS PRESSURE LOW DTC sets if CNG low pressure sensor signal circuit (Dark Green/Light Blue wire) voltage goes to less than .5 volt. Possible causes are: short to ground in CNG low pressure sensor signal circuit (Dark Green/Light Blue wire), failed sensor, or loss of 5-volt power supply. Go to next step.
  5. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  6. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  7. Disconnect and inspect CNG low pressure sensor connector. Repair as necessary. Using scan tool in voltmeter mode, check voltage on CNG low pressure sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is less than 4 volts, repair open in Violet/White wire. Perform TEST VER-2.
  8. If voltage is more than 4 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  9. If connector is okay, use an external ohmmeter to check resistance of CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies) and sensor ground circuit (Black/Light Blue wire) of CNG low pressure sensor connector. If resistance is less than 5 ohms, repair Dark Green/Orange wire or Dark Green/Light Blue wire for a short to Black/Light Blue wire. Perform TEST VER-2.
  10. If resistance is more than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of CNG low pressure sensor connector, CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire or Dark Green/Light Blue. Perform TEST VER-2.
  11. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies) between PCM connector terminal No. 23 and CNG low pressure sensor connector. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire or Dark Green/Light Blue wire. Perform TEST VER-2.
  12. If resistance is less than 5 ohms, turn ignition off. Reconnect all previously disconnected connectors. Turn ignition on. Disconnect CNG low pressure sensor connector. Using scan tool, read CNG low pressure sensor pressure and record pressure reading. Connect a jumper wire between CNG low pressure sensor connector signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies) and ground circuit (Black/Light Blue wire). Using scan tool, read CNG low pressure sensor pressure.
  13. If CNG low pressure sensor pressure drops to zero, see «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) in this article and replace CNG low pressure sensor. Perform TEST VER-2. If CNG low pressure sensor pressure does not drop to zero, replace PCM. Perform TEST VER-2.

TEST TC-22A - CNG PRESSURE SENSOR VOLTAGE TOO HIGH (DTC 64)

  1. Using scan tool, erase DTCs. Turn ignition switch to OFF position for 10 seconds. Attempt to start engine and operate at idle. Using scan tool, read DTCs. If COMPRESSED NATURAL GAS PRESSURE HIGH DTC returns, go to step 7).
  2. If COMPRESSED NATURAL GAS PRESSURE HIGH DTC does not return, observe scan tool voltage display while wiggling Compressed Natural Gas (CNG) low pressure sensor connector and wiring harness. If any CNG low pressure sensor voltage change occurs, repair defective wiring harness or CNG low pressure sensor connector. Perform TEST VER-2.
  3. If no change occurs in CNG low pressure sensor voltage, read DTCs using scan tool. If COMPRESSED NATURAL GAS PRESSURE HIGH DTC returns, repair defective wiring harness or CNG low pressure sensor connector. Perform TEST VER-2.
  4. If COMPRESSED NATURAL GAS PRESSURE HIGH DTC does not return, condition required to set DTC is not present at this time. COMPRESSED NATURAL GAS PRESSURE HIGH DTC sets if CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies) voltage goes to more than 4.96 volts. Possible causes are: open in CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies), open in sensor ground circuit (Black/Light Blue wire), or failed sensor. Go to next step.
  5. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  6. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  7. Disconnect and inspect CNG low pressure sensor connector. Repair as necessary. Using scan tool in voltmeter mode, check voltage on CNG low pressure sensor connector, CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies). If voltage is more than one volt, repair short to voltage in Dark Green/Orange wire or Dark Green/Light Blue wire. Perform TEST VER-2.
  8. If voltage is less than one volt, put scan tool in ohmmeter mode. Using scan tool, check resistance of CNG low pressure sensor connector, sensor ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  9. If resistance is less than 5 ohms, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  10. If connector is okay, use an external ohmmeter to check resistance of CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies) between PCM connector terminal No. 23 and CNG low pressure sensor connector. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire or Dark Green/Light Blue wire. Perform TEST VER-2.
  11. If resistance is less than 5 ohms, turn ignition off. Reconnect all previously disconnected connectors. Turn ignition on. Disconnect CNG low pressure sensor connector. Using scan tool, read CNG low pressure sensor pressure and record pressure reading. Connect a jumper wire between CNG low pressure sensor connector signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies) and ground circuit (Black/Light Blue wire). Using scan tool, read CNG low pressure sensor pressure.
  12. If CNG low pressure sensor pressure drops to zero, see «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) in this article and replace CNG low pressure sensor. Perform TEST VER-2. If CNG low pressure sensor pressure does not drop to zero, replace PCM. Perform TEST VER-2.

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

  1. Turn ignition off. Connect a tachometer. Wait 10 seconds. 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 5).
  2. If tachometer reads, 1300-1500 RPM, using scan tool, actuate IAC motor to 900 RPM. If tachometer does not read 800-1000 RPM, go to step 5). If tachometer reads 800-1000 RPM, turn ignition off. Condition required to set DTC is not present at this time. IDLE AIR CONTROL MOTOR CIRCUITS DTC sets if any of 4 IAC motor wires are shorted to ground or battery voltage. Possible causes are: open IAC motor wires, IAC motor internally shorted or IAC motor wires shorted together. 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, start engine. Ensure engine is warm. 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 5).
  4. 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 DTC CONDITION»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__inactive-dtc-condition) . Perform TEST VER-2.
  5. Turn ignition off. Disconnect Idle Air Control (IAC) motor connector. Inspect IAC motor connector for damaged, pushed-out or miswired terminals. Repair as necessary. If connector is okay, go to next step.
  6. Using scan tool in ohmmeter mode, check resistance of each wire on IAC motor connector. If resistance for any wire was less than 5 ohms, repair appropriate wire for a short to ground. Perform TEST VER-2.
  7. If resistance for all wires was more than 5 ohms, using scan tool, actuate IAC motor. Using scan tool in voltmeter mode, check voltage on each wire of IAC motor connector. If voltage for any wire was less than 5 volts at all times, go to appropriate test. See IAC DRIVER TEST table below. If voltage for all wires was more than 5 volts at any time, go to next step. IAC DRIVER TEST Driver No. Wire Color Test 1 BRN/WHT «23B»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-23b-idle-air-control) 2 YEL/BLK «23C»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-23c-idle-air-control) 3 GRY/RED «23D»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-23d-idle-air-control) 4 VIO/BLK «23E»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-23e-idle-air-control)
  8. Turn ignition off. Using an external ohmmeter, check and record resistance between following driver circuits. See IAC DRIVER CIRCUIT IDENTIFICATION table below: Driver circuit No. 1 and circuits No. 2, 3 and 4. Driver circuit No. 2 and circuits No. 3 and 4. 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
  9. If resistance between any 2 wires is less than 5 ohms, repair those wires for shorting together. Perform TEST VER-2. If resistance between all pairs of wires was more than 5 ohms, replace IAC motor. Perform TEST VER-2.

TEST TC-23B - IDLE AIR CONTROL MOTOR CIRCUITS

  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.
  2. If connector is okay, using an external ohmmeter, check resistance of 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-2. If resistance is more than 5 ohms, repair open Brown/White wire. Perform TEST VER-2.

TEST TC-23C - IDLE AIR CONTROL MOTOR CIRCUITS

  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.
  2. If connector is okay, using an external ohmmeter, check resistance of Yellow/Black wire between IAC motor connector and PCM connector 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. Perform TEST VER-2.

TEST TC-23D - IDLE AIR CONTROL MOTOR CIRCUITS

  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.
  2. If connector is okay, using an external ohmmeter, check resistance of 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-2. If resistance is more than 5 ohms, repair open Gray/Red wire. Perform TEST VER-2.

TEST TC-23E - IDLE AIR CONTROL MOTOR CIRCUITS

  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.
  2. If connector is okay, using an external ohmmeter, check resistance of 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-2. If resistance is more than 5 ohms, repair open Violet/Black wire. Perform TEST VER-2.

TEST TC-24A - A/C CLUTCH RELAY CIRCUIT (DTC 33)

  1. Using scan tool, erase DTCs. Using scan tool, actuate A/C clutch relay. If A/C clutch relay does not click, go to step 6). If A/C clutch relay clicks, condition required to set DTC is not present at this time. Go to next step.
  2. A/C CLUTCH RELAY CIRCUIT DTC sets if A/C clutch relay control circuit (Dark Blue/Orange wire) does not reflect proper state (high or low) requested by Powertrain Control Module (PCM). Possible causes are open or short in relay coil, open or short in A/C clutch relay control circuit (Dark Blue/Orange wire), open or short in ignition 12-volt feed circuit (Dark Blue wire) to relay coil, and failed control circuit driver in PCM.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, wiggle wiring harness from A/C clutch relay to PCM. Ensure actuator test is still running and attempt to reset DTC. Using scan tool, read DTCs. If A/C CLUTCH RELAY CIRCUIT DTC returns, repair wiring harness where wiggling caused problem to occur. Perform TEST VER-2.
  4. If A/C CLUTCH RELAY CIRCUIT DTC does not return, perform following additional checks to assist in identifying a possible intermittent problem.
  5. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  6. Replace A/C clutch relay with a known good relay. If replacement relay clicks, original A/C clutch relay is defective. Perform TEST VER-2. If replacement relay does not click, remove replacement relay. Using scan tool in voltmeter mode, check voltage on A/C clutch relay connector, ignition 12-volt feed circuit (Dark Blue wire on AB and AN bodies; Light Green/Black wire on BR body).
  7. If voltage is less than 10 volts, repair open in Dark Blue wire, Dark Blue/White wire or Light Green/Black wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  8. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of A/C clutch relay connector, A/C clutch relay control circuit (Dark Blue/Orange wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Orange wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of A/C clutch relay control circuit (Dark Blue/Orange wire) between PCM connector terminal No. 34 and A/C clutch relay connector. If resistance is more than 5 ohms, repair open in Dark Blue/Orange wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-25A - NO ASD RELAY OUTPUT VOLTAGE AT PCM (DTC 42)

  1. If scan tool also displays AUTO SHUTDOWN RELAY CONTROL CIRCUIT, go to TEST TC-26A. If scan tool does not display AUTO SHUTDOWN RELAY CONTROL CIRCUIT, using scan tool, erase DTCs. Attempt to start and idle engine. Using scan tool, read DTCs. If engine starts and NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC does not reset, go to next step. If NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC resets, and/or engine did not start, go to step 5).
  2. Condition required to set DTC is not present at this time. NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC 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 ASD relay control circuits (Dark Blue/Yellow wire), open or short in ASD relay ignition feed circuit (Red wire on AB body; Red/White wire on AN and BR bodies), 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 scan tool, read DTCs. If NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC returned, repair wiring harness as necessary. Perform TEST VER-2. If NO ASD RELAY OUTPUT VOLTAGE AT PCM DTC did not return, see «INACTIVE DTC CONDITION»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__inactive-dtc-condition) . Perform TEST VER-2.
  5. If engine started, turn ignition off and go to step 7). If engine did not start, remove Auto Shutdown (ASD) relay. Using scan tool in voltmeter mode, check voltage on ASD relay connector, battery feed circuit (Red wire). If voltage is less than 10 volts, repair open in Red wire or Red/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. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance of 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. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-26A - AUTO SHUTDOWN RELAY CONTROL CIRCUIT (DTC 42)

  1. Using scan tool, erase DTCs and actuate Auto Shutdown (ASD) relay. If ASD relay does not click, go to step 4). If ASD relay clicks, condition required to set DTC is not present at this time. AUTO SHUTDOWN RELAY CONTROL CIRCUIT DTC sets if ASD and high pressure fuel solenoid relay control circuit is not in proper state when checked by Powertrain Control Module (PCM) during cranking.
  2. Possible causes are open or short in ASD relay and high pressure fuel solenoid relay control circuit, open or short in ASD relay control circuit (Dark Blue/Yellow wire), open or short in ignition 12-volt feed circuit (Red wire on AB body; Red/White wire on AN and BR bodies), and failed control circuit driver in PCM.
  3. Inspect all related wiring and connectors. Repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, wiggle wiring harness from ASD relay to PCM. Ensure actuator test is still running and try to reset DTC. Using scan tool, read DTCs. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT DTC returns, repair wiring harness where wiggling caused problem to occur. Perform TEST VER-2. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT DTC does not return, test is complete. Perform TEST VER-2.
  4. Disconnect and inspect ASD relay connector. Repair as necessary. Using scan tool in voltmeter mode, check voltage on ASD relay connector, ignition 12-volt feed circuit (Red wire on AB body; Red/White wire on AN and BR bodies). If voltage is less than 10 volts, repair open in Red wire, Red/White wire or Dark Blue/White wire. Perform TEST VER-2.
  5. If voltage is more than 10 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  6. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of ASD relay connector, ASD relay control circuit (Dark Blue/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire. Perform TEST VER-2.
  7. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of ASD relay control circuit (Dark Blue/Yellow wire) between PCM connector terminal No. 51 and ASD relay connector. If resistance is more than 5 ohms, repair open in Dark Blue/Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-27A - TRANS OVERDRIVE SOLENOID CIRCUIT (DTC 45)

  1. Using scan tool, erase DTCs. Using scan tool, actuate overdrive solenoid. Overdrive solenoid/Torque Converter Clutch (TCC) solenoid connector is located on left side of transmission. Wait 10 seconds, then read DTCs using scan tool. If TRANS OVERDRIVE SOLENOID CIRCUIT DTC returns, go to step 5).
  2. If TRANS OVERDRIVE SOLENOID CIRCUIT DTC does not return, wiggle wiring harness from overdrive solenoid/TCC solenoid connector to Powertrain Control Module (PCM). Ensure actuator test is still running and attempt to reset DTC. Using scan tool, read DTCs. If TRANS OVERDRIVE SOLENOID CIRCUIT DTC returns, repair wiring harness where wiggling caused problem to occur. Perform TEST VER-2.
  3. If TRANS OVERDRIVE SOLENOID CIRCUIT DTC does not return, condition required to set DTC is not present at this time. TRANS OVERDRIVE SOLENOID CIRCUIT DTC sets if overdrive solenoid control circuit (Orange/White wire) is not in its proper state (circuit voltage low when solenoid is off; circuit voltage high when solenoid is on) when monitored by Powertrain Control Module (PCM).
  4. Possible causes are: open or short in overdrive solenoid control circuit (Orange/White wire), open or short in overdrive solenoid coil, or open in ignition 12-volt feed circuit (Dark Blue wire). Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect overdrive solenoid/TCC solenoid connector. Repair as necessary. Perform TEST VER-2. If connector is okay, using scan tool in voltmeter mode, check voltage on overdrive solenoid/TCC solenoid connector, ignition 12-volt feed circuit (Dark Blue wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  7. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of PCM connector terminal No. 55, overdrive solenoid control circuit (Orange/White wire). If resistance is less than 5 ohms, repair short to ground in Orange/White wire. Perform TEST VER-2.
  8. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of overdrive solenoid control circuit (Orange/White wire) between PCM connector terminal No. 55 and overdrive solenoid/TCC solenoid connector. If resistance is more than 5 ohms, repair open in Orange/White wire. Perform TEST VER-2.
  9. If resistance is less than 5 ohms, turn ignition off. Reconnect overdrive solenoid/TCC solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 55, overdrive solenoid control circuit (Orange/White wire). If voltage is less than 10 volts, replace overdrive solenoid. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.

TEST TC-28A - TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT (DTC 37)

  1. Using scan tool, erase DTCs and actuate Torque Converter Clutch (TCC) solenoid. Overdrive solenoid/TCC solenoid connector is located on left side of transmission. Wait 10 seconds, then read DTCs using scan tool. If TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT DTC returns, go to step 5).
  2. If TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT DTC does not return, wiggle wiring harness from overdrive solenoid/TCC solenoid connector to Powertrain Control Module (PCM). Ensure actuator test is still running and try to reset DTC. Using scan tool, read DTCs. If TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT DTC returns, repair wiring harness where wiggling caused problem to occur. Perform TEST VER-2.
  3. If TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT DTC does not return, condition required to set DTC is not present now. TORQUE CONVERTER CLUTCH SOLENOID CIRCUIT DTC sets if TCC solenoid or TCC relay control circuit (Orange/Black wire) is not in its proper state when monitored by PCM.
  4. Possible causes are open or short in TCC solenoid or TCC relay control circuit (Orange/Black wire), open or short in TCC solenoid or TCC relay coil, and open in ignition 12-volt feed circuit (Dark Blue wire). Test is complete. Perform TEST VER-2.
  5. Disconnect and inspect overdrive solenoid/TCC solenoid connector. Repair as necessary. Using scan tool in voltmeter mode, check voltage on overdrive solenoid/TCC solenoid connector, ignition 12-volt feed circuit (Dark Blue wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-2.
  7. If connector is okay, use scan tool in ohmmeter mode to check resistance of PCM connector terminal No. 54, TCC solenoid or relay control circuit (Orange/Black wire). If resistance is less than 5 ohms, repair short to ground in Orange/Black wire. Perform TEST VER-2.
  8. If resistance is more than 5 ohms, use external ohmmeter to check resistance of TCC solenoid or relay control circuit (Orange/Black wire) between PCM connector terminal No. 54 and overdrive solenoid/TCC solenoid connector. If resistance is more than 5 ohms, repair open in Orange/Black wire. Perform TEST VER-2.
  9. If resistance is less than 5 ohms, turn ignition off. Reconnect overdrive solenoid/TCC solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 54, TCC solenoid or relay control circuit (Orange/Black wire). If voltage is less than 10 volts, replace TCC solenoid or relay. Perform TEST VER-2. If voltage is more than 10 volts, replace PCM. Perform TEST VER-2.

TEST TC-29A - EGR SOLENOID CIRCUIT (DTC 32)

  1. Using scan tool, erase DTCs. Using scan tool, actuate Exhaust Gas Recirculation (EGR) solenoid. EGR solenoid connector is located on rear of engine, to right of distributor. Using scan tool, read DTCs. If EGR SOLENOID CIRCUIT DTC returns, go to step 5).
  2. If EGR SOLENOID CIRCUIT DTC does not return, condition required to set DTC is not present at this time. EGR SOLENOID CIRCUIT DTC sets if EGR solenoid is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or short in EGR solenoid control circuit (Gray/Yellow wire), open or short in EGR solenoid, open in ignition 12-volt feed circuit (Dark Blue wire), or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If wiring and connectors are okay, wiggle wiring harness from EGR solenoid to PCM. Ensure actuator test is still running and attempt to reset DTC. Using scan tool, read DTCs. If EGR SOLENOID CIRCUIT DTC returns, repair wiring harness where wiggling caused problem to occur. Perform TEST VER-2.
  4. If EGR SOLENOID CIRCUIT DTC does not return, perform following additional checks to assist in identifying a possible intermittent problem. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.
  5. Turn ignition off. Disconnect and inspect EGR solenoid connector. Repair as necessary. Perform TEST VER-2. If connector is okay, using scan tool in voltmeter mode, check voltage on EGR solenoid connector, ignition 12-volt feed circuit (Dark Blue wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform TEST VER-2.
  6. If voltage is more than 10 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-2.
  7. If connector is okay, use an external ohmmeter to check resistance of EGR solenoid control circuit (Gray/Yellow wire) between PCM connector terminal No. 35 and EGR solenoid connector. If resistance is more than 5 ohms, repair open in Gray/Yellow wire. Perform TEST VER-2.
  8. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of PCM connector terminal No. 35, EGR solenoid control circuit (Gray/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Gray/Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, turn ignition off.
  9. Reconnect EGR solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 35, EGR solenoid control circuit (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-30A - EGR SYSTEM FAILURE (DTC 32)

  1. Start engine and allow to idle for 2 minutes. Disconnect Exhaust Gas Recirculation (EGR) solenoid vacuum supply hose. Connect a vacuum gauge to disconnected EGR vacuum supply hose. If vacuum gauge does not indicate more than 10 in. Hg of vacuum, repair EGR vacuum supply hose to EGR solenoid. Perform TEST VER-2.
  2. If vacuum gauge indicates more than 10 in. Hg of vacuum, reconnect EGR solenoid vacuum supply hose. Disconnect EGR valve hose. (Scheme 93) Connect a vacuum gauge to disconnected EGR valve hose. Observe vacuum gauge and momentarily raise engine speed to more than 2000 RPM. If vacuum gauge does not indicate more than 5 in. Hg of vacuum with throttle open, replace EGR valve assembly. Perform TEST VER-2.
  3. If vacuum gauge indicates more than 5 in. Hg of vacuum with throttle open, remove vacuum gauge from EGR valve hose. Connect a vacuum pump to EGR valve nipple. Ensure engine is operating at idle. Slowly apply vacuum to EGR valve and observe engine idle. If engine idle is rough or engine stalls with vacuum applied, go to step 5).
  4. If engine does not idle rough or stall with vacuum applied, remove EGR valve and inspect manifold for restrictions. Repair restrictions as necessary. Perform TEST VER-2. If no restrictions are present, replace EGR valve assembly. Perform TEST VER-2.
  5. Turn ignition off. Apply 10 in. Hg of vacuum to EGR valve nipple and observe vacuum gauge. If vacuum does not hold for at least 10 seconds, replace EGR valve assembly. Perform TEST VER-2.
  6. If vacuum holds for at least 10 seconds, condition required to set DTC is not present at this time. EGR SYSTEM FAILURE DTC sets when Powertrain Control Module (PCM) performs a test of EGR system and monitors Oxygen Sensor (O2S) signal for a change. Possible causes are: EGR valve not opening, blocked EGR transfer tube, or blocked EGR passages in manifold. Go to next step.
  7. Inspect all related hoses and connectors, and repair as necessary. Perform TEST VER-2. If hoses and connectors are okay, perform following additional checks to assist in identifying a possible intermittent problem.
  8. Visually inspect related wiring harness connectors for broken, bent, pushed-out or corroded terminals. Visually inspect related wiring harnesses for chafed, pierced or broken wires. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. Test is complete. Perform TEST VER-2.

EGR Solenoid & Valve Vacuum Hose ID (All Models). Scheme 93

Scheme 93: EGR Solenoid & Valve Vacuum Hose ID (All Models)
Scheme 93: EGR Solenoid & Valve Vacuum Hose ID (All Models)

TEST TC-31A - PCM FAILURE SRI MILE NOT STORED & PCM FAILURE EEPROM WRITE DENIED (DTC 62 & 63)

  1. Turn ignition on. Using scan tool, perform SRI MEMORY CHECK. See ADJUSTMENTS MENU under SCAN TOOL TEST FUNCTIONS. If scan tool displays WRITE FAILURE, replace Powertrain Control Module (PCM). Perform TEST VER-2. If scan tool displays WRITE REFUSED, go to step 3).
  2. If scan tool displays SRI MILEAGE INVALID, update mileage and retest SRI memory. Perform TEST VER-2. If scan tool displays mileage, compare mileage on scan tool with instrument cluster odometer. If scan tool and instrument cluster odometer mileages are same, retest SRI memory. Perform TEST VER-2. If scan tool and instrument cluster odometer mileages differ, update mileage and retest SRI memory. Perform TEST VER-2.
  3. PCM was busy. Using scan tool, perform SRI MEMORY CHECK. Retest SRI memory 2 more times when necessary. If scan tool displays WRITE REFUSED, replace PCM. Perform TEST VER-2. If scan tool does not display WRITE REFUSED, test is complete. Perform TEST VER-2.

TEST TC-32A - LOW SPEED FAN CONTROL CIRCUIT (DTC 35)

  1. Using scan tool, erase DTCs. Using scan tool, actuate low speed radiator fan relay. If low speed radiator fan relay is not clicking, go to step 5). If low speed radiator fan relay is clicking, go to next step.
  2. Condition required to set DTC is not present at this time. The LOW SPEED FAN CONTROL RELAY CIRCUIT DTC sets if low speed radiator fan relay control circuit (Dark Blue/Pink wire) is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or short in low speed radiator fan relay coil windings, open or short in low speed radiator fan relay control circuit (Dark Blue/Pink wire), open or short in low speed radiator fan relay ignition feed circuit (Dark Blue/White wire) or failed driver in 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 still actuating low speed radiator fan relay, wiggle wiring harness from radiator fan relay to PCM. Stop actuation of low speed radiator fan relay. Using scan tool, read DTCs. If LOW SPEED FAN CONTROL RELAY CIRCUIT DTC returned, repair wiring harness as necessary. Perform TEST VER-2. If LOW SPEED FAN CONTROL RELAY CIRCUIT DTC did not return, system is now functioning properly. Perform TEST VER-2.
  5. Remove low speed radiator fan relay. Install a known-good low speed radiator fan relay. If known-good low speed radiator fan relay is clicking, replace original low speed radiator fan relay. Perform TEST VER-2. If known-good low speed radiator fan relay is not clicking, remove known-good low speed radiator fan relay. Put scan tool in voltmeter mode.
  6. Using scan tool, check voltage on low speed radiator fan relay connector, ignition feed circuit (Dark Blue/White wire). If voltage is less than 10 volts, repair open in Dark Blue wire. Perform TEST VER-2.
  7. If voltage is more than 10 volts, using an external ohmmeter, check resistance between low speed radiator fan relay terminals. (Scheme 94) If resistance is more than 100 ohms, replace low speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM). Disconnect PCM connector. Using scan tool in ohmmeter mode, check resistance of low speed radiator fan relay connector, control circuit (Dark Blue/Pink wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Pink wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of control circuit (Dark Blue/Pink wire) between radiator fan relay connector and PCM connector terminal No. 31. If resistance is more than 5 ohms, repair open in Dark Blue/Pink wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

Testing Relay (All Models). Scheme 94

Scheme 94: Testing Relay (All Models)
Scheme 94: Testing Relay (All Models)

TEST TC-33A - HIGH SPEED FAN CONTROL CIRCUIT (DTC 35)

  1. Using scan tool, erase DTCs. Using scan tool, actuate high speed radiator fan relay. If high speed radiator fan relay is not clicking, go to step 5). If high speed radiator fan relay is clicking, go to next step.
  2. Condition required to set DTC is not present at this time. The HIGH SPEED FAN CONTROL RELAY CIRCUIT DTC sets if high speed radiator fan relay control circuit (Yellow wire) is not in its proper state when monitored by Powertrain Control Module (PCM). Possible causes are: open or short in high speed radiator fan relay coil windings, open or short in high speed radiator fan relay control circuit (Yellow wire), open or short in high speed radiator fan relay ignition feed circuit (Dark Blue/White wire) or failed driver in 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 still actuating high speed radiator fan relay, wiggle wiring harness from radiator fan relay to PCM. Stop actuation of high speed radiator fan relay. Using scan tool, read DTCs. If HIGH SPEED FAN CONTROL RELAY CIRCUIT DTC returned, repair wiring harness as necessary. Perform TEST VER-2. If HIGH SPEED FAN CONTROL RELAY CIRCUIT DTC did not return, system is now functioning properly. Perform TEST VER-2.
  5. Remove high speed radiator fan relay. Install a known-good high speed radiator fan relay. If known-good high speed radiator fan relay is clicking, replace original high speed radiator fan relay. Perform TEST VER-2. If known-good high speed radiator fan relay is not clicking, remove known-good high speed radiator fan relay. Put scan tool in voltmeter mode.
  6. Using scan tool, check voltage on high speed radiator fan relay connector, ignition feed circuit (Dark Blue/White wire). If voltage is less than 10 volts, repair open in Dark Blue/White wire. Perform TEST VER-2.
  7. If voltage is more than 10 volts, using an external ohmmeter, check resistance between high speed radiator fan relay terminals. (Scheme 94) If resistance is more than 100 ohms, replace high speed radiator fan relay. If resistance is less than 100 ohms, go to next step.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM). Using scan tool in ohmmeter mode, check resistance of high speed radiator fan relay connector, control circuit (Yellow wire). If resistance is less than 5 ohms, repair short to ground in Yellow wire. Perform TEST VER-2.
  9. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of control circuit (Yellow wire) between radiator fan relay connector and PCM connector terminal No. 55. If resistance is more than 5 ohms, repair open in Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-34A - IGNITION COIL PRIMARY CIRCUIT (DTC 43)

  1. Using scan tool, erase DTCs. Attempt to start engine. If necessary, crank engine for at least 10 seconds. Using scan tool, read DTCs. If scan tool does not display IGNITION COIL PRIMARY CIRCUIT, go to next step. If scan tool displays IGNITION COIL PRIMARY CIRCUIT, go to appropriate test. See IGNITION COIL DTCS table below. IGNITION COIL DTCS DTC Go To IGNITION COIL #1 PRIMARY CIRCUIT «TEST TC-34B»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-34b-ignition-coil-1) IGNITION COIL #2 PRIMARY CIRCUIT «TEST TC-35A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-35a-ignition-coil-2) IGNITION COIL #3 PRIMARY CIRCUIT «TEST TC-36A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-36a-ignition-coil-3)
  2. At this time, condition required to set DTC is not present. IGNITION COIL PRIMARY CIRCUIT DTC sets when Powertrain Control Module (PCM) does not see peak current reached. Possible causes are: open or shorted coil, open or shorted control circuit, open power supply circuit (Dark Green/Orange wire), or failed driver in PCM.
  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. Start engine. Wiggle wiring harness from Direct Ignition System (DIS) coil pack to PCM. If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see «INACTIVE DTC CONDITION»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__inactive-dtc-condition) . Perform TEST VER-2.

TEST TC-34B - IGNITION COIL #1 PRIMARY CIRCUIT

  1. Turn ignition off. Disconnect ignition coil connector. Check connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
  2. Turn ignition on. Using scan tool, actuate ignition coil No. 1. Using scan tool in voltmeter mode, check voltage on ignition coil connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform TEST VER-2.
  3. If voltage is more than 10 volts, using an external ohmmeter, check resistance of ignition coil No. 1 primary circuit. Put one ohmmeter lead on ignition coil connector, cylinders No. 1 and 4 pin, and other ohmmeter lead on ignition coil connector, battery positive pin. (Scheme 95) If resistance is more than 2 ohms, replace ignition coil. Perform TEST VER-2.
  4. If resistance is less than 2 ohms, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 19, ignition coil No. 1 driver circuit (Black/Gray wire). If resistance is less than 5 ohms, repair short to ground in Black/Gray wire. Perform TEST VER-2.
  5. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of ignition coil driver circuit (Black/Gray wire) between ignition coil connector and PCM connector terminal No. 19. If resistance is more than 5 ohms, repair open in Black/Gray wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

Ignition Coil Connector Terminal ID (All Models). Scheme 95

Scheme 95: Ignition Coil Connector Terminal ID (All Models)
Scheme 95: Ignition Coil Connector Terminal ID (All Models)

TEST TC-35A - IGNITION COIL #2 PRIMARY CIRCUIT (DTC 43)

  1. Turn ignition off. Disconnect ignition coil connector. Check connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
  2. Turn ignition on. Using scan tool, actuate ignition coil No. 2. Using scan tool in voltmeter mode, check voltage on ignition coil connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform TEST VER-2.
  3. If voltage is more than 10 volts, using an external ohmmeter, check resistance of ignition coil No. 2 primary circuit. Put one ohmmeter lead on ignition coil connector, cylinders No. 2 and 5 pin, and other ohmmeter lead on ignition coil connector, battery positive pin. (Scheme 95) If resistance is more than 2 ohms, replace ignition coil. Perform TEST VER-2.
  4. If resistance is less than 2 ohms, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 17, ignition coil No. 2 driver circuit (Dark Blue/Tan wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Tan wire. Perform TEST VER-2.
  5. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of ignition coil driver circuit (Dark Blue/Tan wire) between ignition coil connector and PCM connector terminal No. 17. If resistance is more than 5 ohms, repair open in Dark Blue/Tan wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-36A - IGNITION COIL #3 PRIMARY CIRCUIT (DTC 43)

  1. Turn ignition off. Disconnect ignition coil connector. Check connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
  2. Turn ignition on. Using scan tool, actuate ignition coil No. 3. Using scan tool in voltmeter mode, check voltage on ignition coil connector, Auto Shutdown (ASD) output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform TEST VER-2.
  3. If voltage is more than 10 volts, using an external ohmmeter, check resistance of ignition coil No. 3 primary circuit. Put one ohmmeter lead on ignition coil connector, cylinders No. 3 and 6 pin, and other ohmmeter lead on ignition coil connector, battery positive pin. (Scheme 95) If resistance is more than 2 ohms, replace ignition coil. Perform TEST VER-2.
  4. If resistance is less than 2 ohms, turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 18, ignition coil No. 3 driver circuit (Dark Blue/Gray wire). If resistance is less than 5 ohms, repair short to ground in Dark Blue/Gray wire. Perform TEST VER-2.
  5. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of ignition coil driver circuit (Dark Blue/Gray wire) between ignition coil connector and PCM connector terminal No. 18. If resistance is more than 5 ohms, repair open in Dark Blue/Gray wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-37A - INJECTOR CONTROL CIRCUITS (DTC 27)

  1. Using scan tool, erase DTCs. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds.
  2. Using scan tool, read DTCs. 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 DTC is not present at this time. Go to next step. If scan tool displays INJECTOR CONTROL CIRCUIT, go to appropriate test. See INJECTOR DTCS table below. INJECTOR DTCS DTC Go To INJECTOR #1 CONTROL CIRCUIT «TC-37B»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-37b-injector-1-control) INJECTOR #2 CONTROL CIRCUIT «TC-38A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-38a-injector-2-control) INJECTOR #3 CONTROL CIRCUIT «TC-39A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-39a-injector-3-control) INJECTOR #4 CONTROL CIRCUIT «TC-40A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-40a-injector-4-control) INJECTOR #5 CONTROL CIRCUIT «TC-41A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-41a-injector-5-control) INJECTOR #6 CONTROL CIRCUIT «TC-42A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-42a-injector-6-control) INJECTOR #7 CONTROL CIRCUIT «TC-43A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-43a-injector-7-control) INJECTOR #8 CONTROL CIRCUIT «TC-44A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-tc-44a-injector-8-control)
  3. INJECTOR CONTROL CIRCUIT DTC sets if Powertrain Control Module (PCM) does not detect injector "turn-off edge" when expected. Possible causes are: open or shorted injector control circuit, open injector power supply circuit, open injector, or failed driver in 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 DTC CONDITION»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__inactive-dtc-condition) . Perform TEST VER-2.

TEST TC-37B - INJECTOR #1 CONTROL CIRCUIT

  1. Turn ignition off. Disconnect injector No. 1 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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/Brown wire on AB body; White/Dark Blue wire on AN and BR bodies) between injector connector (harness side) and PCM connector terminal No. 16. If resistance is more than 5 ohms, repair open White/Brown wire, Dark Blue wire or Light Blue wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 16 (White/Brown wire on AB, AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in White/Brown wire or Light Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-38A - INJECTOR #2 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 2 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White wire on AB body; Tan wire on AN and BR bodies) between injector connector (harness side) and PCM connector terminal No. 15. If resistance is more than 5 ohms, repair open White wire or Tan wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 15 (White wire on AB body; Tan wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in White wire or Tan wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-39A - INJECTOR #3 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 3 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White/Yellow wire on AB body; Yellow/White wire on AN and BR bodies) between injector connector (harness side) and PCM connector terminal No. 14. If resistance is more than 5 ohms, repair open White/Yellow wire, Yellow/White wire or Brown wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 14 (White/Yellow wire on AB body; Yellow/White wire on AN and BR). If resistance is less than 5 ohms, repair short to ground in White/Yellow wire or Yellow/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-40A - INJECTOR #4 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 4 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White/Light Blue wire on AB; Light Blue/Brown wire on AN and BR bodies) between injector connector (harness side) and PCM connector terminal No. 13. If resistance is more than 5 ohms, repair open White/Light Blue wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 13 (White/Light Blue wire on AB body; Light Blue/Brown wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in White/Light Blue wire or Light Blue/Brown wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-41A - INJECTOR #5 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 5 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White/Black wire on AB body; Pink/Black wire on AN body; Gray wire on BR bodies) between injector connector (harness side) and PCM connector terminal No. 38. If resistance is more than 5 ohms, repair open White/Black wire, Pink/Black wire or Gray wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 38 (White/Black wire on AB body; Pink/Black wire on AN body; Gray wire on BR bodies). If resistance is less than 5 ohms, repair short to ground in White/Black wire, 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-42A - INJECTOR #6 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 6 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White/Red wire on AB body; Light Green/Black wire on AN body; Brown/Dark Blue wire on BR bodies) between injector connector (harness side) and PCM connector terminal No. 58. If resistance is more than 5 ohms, repair open White/Red wire, Light Green/Black wire or Brown/Dark Blue wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 58 (White/Red wire on AB body; Light Green/Black wire on AN body; Brown/Dark Blue wire on BR bodies). If resistance is less than 5 ohms, repair short to ground in White/Red wire, Light Green/Black wire or Brown/Dark Blue wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-43A - INJECTOR #7 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 7 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White/Tan wire on AB body; Dark Blue/Tan wire on AN and BR bodies) between injector connector (harness side) and PCM connector terminal No. 17. If resistance is more than 5 ohms, repair open White/Tan wire or Dark Blue/Tan wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 17 (White/Tan wire on AB body; Dark Blue/Tan wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in White/Tan wire or Dark Blue/Tan wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST TC-44A - INJECTOR #8 CONTROL CIRCUIT (DTC 27)

  1. Turn ignition off. Disconnect injector No. 8 connector. Using an external ohmmeter, check resistance between injector terminals. If resistance is not 3.5-5.5 ohms, replace injector. Perform TEST VER-2. If resistance is 3.5-5.5 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. 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 (White/Gray wire an AB body; Dark Blue/Gray wire on AN body; 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 White/Gray wire, Dark Blue/Gray wire or Red/Yellow wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, using scan tool in ohmmeter mode, check resistance of PCM terminal No. 18 (White/Gray wire on AB body; Dark Blue/Gray wire on AN body; Red/Yellow wire on BR body). If resistance is less than 5 ohms, repair short to ground in White/Gray wire, Dark Blue/Gray wire or Red yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.

TEST NTC-1A - NO DTC TEST MENU

  1. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary. To perform a no DTC complete test on monitored and non-monitored circuits, perform TEST NTC-2A through TEST NTC-16A in sequence until driveability problem is found. See NO DTC MENU table below. NO DTC MENU Engine Controller System Test CHECKING SECONDARY IGNITION & TIMING «NTC-2A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-2a-checking-secondary-ignition) CHECKING FUEL PRESSURE «NTC-3A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-3a-checking-fuel-pressure) CHECKING FUEL INJECTORS «NTC-4A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-4a-checking-fuel-injectors) CHECKING COOLANT SENSOR CALIBRATION «NTC-5A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-5a-checking-coolant-sensor) CHECKING TP SENSOR CALIBRATION «NTC-6A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-6a-checking-tp-sensor) CHECKING MAP SENSOR CALIBRATION «NTC-7A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-7a-checking-map-sensor) CHECKING OXYGEN SENSOR SWITCHING «NTC-8A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-8a-checking-oxygen-sensor) CHECKING OXYGEN SENSOR HEATER «NTC-9A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-9a-checking-oxygen-sensor) CHECKING IDLE AIR CONTROL MOTOR «NTC-10A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-10a-checking-idle-air) CHECKING SOLENOID OPERATIONS (1) «NTC-11A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-11a-checking-solenoid-operations) CHECKING PARK/NEUTRAL SWITCH «NTC-12A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-12a-checking-parkneutral-switch) CHECKING PCM GROUNDS & POWER CIRCUIT «NTC-13A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-13a-checking-pcm-grounds) CHECKING EGR SYSTEM (1) «NTC-14A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-14a-checking-egr-system) CHECKING ENGINE VACUUM «NTC-15A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-15a-checking-engine-vacuum) PERFORMING NO DTC MECHANICAL TEST «NTC-16A»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__test-ntc-16a-performing-no-dtc) (1) AB, AN and BR bodies only.
  2. A no DTC quick individual test can be performed on any suspected individual no DTC menu item that may be causing vehicle's driveability problem. See «NO DTC MENU»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng) table. If driveability problem has not been corrected after performing individual test, return to NO DTC MENU table to perform another individual test or perform a no DTC complete test to test all items in NO DTC MENU table.
  3. A no DTC quick symptom test can be performed if driveability problem characteristic actually occurs while vehicle is being tested. To reduce diagnostic time, perform TEST TC-1A before attempting to diagnose a symptom. Select symptom that most accurately describes vehicle's driveability problem, then perform test that pertains to that symptom. See DRIVEABILITY SYMPTOMS & TESTS table below.
SymptomTest
HARD STARTNTC-2A , 3A-8A , 13A , 15A & 16A
START & STALLNTC-2A , 3A-8A , 13A & 16A
HESITATION/SAG/STUMBLE(1)
SURGENTC-2A , 3A-8A , 13A , 14A & 16A
LACK OF POWER/SLUGGISHNTC-2A , 3A-8A , 13A , 15A & 16A
SPARK KNOCK/DETONATIONNTC-2A , 3A-8A , 11A
SPARK KNOCK/DETONATION13A , 14A & 16A
CUTS OUT/MISSESNTC-2A , 3A , 4A , 7A , 8A
CUTS OUT/MISSES11A , 13A , 15A & 16A
BACKFIRE/POP-BACKNTC-2A , 3A-7A , 13A , 15A & 16A
RUNS ROUGH/UNSTABLE/ERRATIC IDLE(1)
POOR FUEL ECONOMY(1)
(1) Perform no DTC complete test.
(1)Perform no DTC complete test.

DRIVEABILITY SYMPTOMS & TESTS

TEST NTC-2A - CHECKING SECONDARY IGNITION & TIMING

  1. Turn ignition off. Connect a suitable engine analyzer to engine. Start engine and operate at idle. If engine will not idle, maintain a constant RPM more than idle. Set scope to read display or parade pattern. Following equipment manufacturer's procedure for pattern analysis, analyze secondary ignition pattern. If secondary ignition pattern is not okay, repair indicated component in secondary ignition system. Perform TEST VER-2.
  2. If secondary ignition pattern is okay, Remove any spark plug wire while observing secondary k/volts line. If open circuit secondary voltage is less than 25 k/volts, replace electronic ignition coil. Perform TEST VER-2. If open circuit secondary voltage is more than 25 k/volts, reinstall spark plug wire(s). Go to next step.
  3. Ensure engine operating temperature is more than 180°F. Using scan tool, read total timing advance. Increase engine speed to 2000 RPM. If timing advance does not change when RPM is increased, replace Powertrain Control Module (PCM). Perform TEST VER-2. If timing advance changes when RPM is increased, secondary ignition and timing are okay. Test is complete.

TEST NTC-3A - CHECKING FUEL PRESSURE

Note. Before any part of Compressed Natural Gas (CNG) fuel system is opened for repair, purge system of all natural gas. See FUEL PRESSURE RELEASE .

  1. On vehicles equipped with fuel rail test port, connect a 0-300 psi pressure test gauge to test port. On vehicles not equipped with fuel rail test port, purge fuel system. See «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) . Remove Compressed Natural Gas (CNG) low pressure sensor. Connect a 0-300 psi pressure test gauge between CNG low pressure sensor and fuel rail block. Install CNG low pressure sensor to test gauge tee connection. If CNG low pressure sensor is not reinstalled, engine will start, then stall.
  2. On all models, ensure fuel tank is 1/4 full. Start engine. Allow it to reach normal operating temperature (more than 180°F). If pressure gauge indicates 90-140 psi, go to step 5). If gauge indicates more than 140 psi, replace fuel pressure regulator. Perform TEST VER-2.
  3. If gauge indicates less than 90 psi, perform following checks to help identify possible fuel delivery mechanical problems. Ensure all cylinders have fuel, all fuel cylinder control valves are opened, manual gas shutoff valve is opened, fuel lines are free of any kinks or bends, and fuel filter is not plugged.
  4. If any fuel delivery mechanical problems are present, repair fuel delivery system as necessary. Perform TEST VER-2. If fuel delivery mechanical problems are not present, fuel problem has not been located, go to TEST NTC-1A.
  5. Using scan tool, read fuel pressure. Compare scan tool fuel pressure reading with pressure test gauge reading. If readings are not within 5 psi of each other, replace CNG low pressure sensor. Perform TEST VER-2. If CNG fuel pressure is within 5 psi of pressure test gauge reading, fuel pressure is okay. Test is complete.

TEST NTC-4A - CHECKING FUEL INJECTORS

  1. Using scan tool, individually actuate all 8 fuel injectors. If all injectors click, fuel injectors are okay, Test is complete.
  2. If any fuel injectors do not click, actuate fuel system for 5 seconds using scan tool, then stop actuation test. Using scan tool, read Compressed Natural Gas (CNG) fuel pressure for 20 seconds. If fuel pressure is less than 10 psi, go to TEST NS-3A.
  3. If fuel pressure is more than 10 psi, locate inoperable injector(s). Using scan tool, actuate injector next to suspect injector. Install actuating injector harness connector onto suspect injector. If suspect injector does not click, replace injector. Perform TEST VER-2.
  4. If suspect injector clicks, stop actuation test using scan tool. Turn ignition on. Using scan tool in voltmeter mode, actuate fuel system and check voltage on suspect fuel injector connector, ASD relay output circuit (Dark Green/Orange wire). If voltage is less than 5 volts, repair open in Dark Green/Orange wire. Perform TEST VER-2.
  5. If voltage is more than 5 volts, and with scan tool still actuating fuel system, connect a jumper wire to Powertrain Control Module (PCM) connector (DO NOT disconnect PCM connector), injector driver circuit and momentarily ground circuit. See PCM CONNECTOR TERMINAL IDENTIFICATION table below. PCM CONNECTOR TERMINAL IDENTIFICATION Terminal No. Function Wire Color 13 Injector No. 4 Driver (1) Light Blue/Brown 14 Injector No. 3 Driver (2) Yellow/White 15 Injector No. 2 Driver (3) Tan 16 Injector No. 1 Driver (4) White/Dark Blue 17 Injector No. 7 Driver (5) Dark Blue/Tan 18 Injector No. 8 Driver (6) 38 Injector No. 5 Driver (7) 58 Injector No. 6 Driver (8) (1) White/Light Blue wire on AB body. (2) White/Yellow wire on AB body. (3) White wire on AB body. (4) White/Brown wire on AB body (5) White/Tan wire on AB body. (6) White/Gray wire on AB body; Dark Blue/Gray wire on AN body; Red/Yellow wire on BR body. (7) White/Black wire on AB body; Pink/Black wire on AN body; Gray wire on BR body. (8) White/Red wire on AB body; Light Green/Black wire on AN body; Brown/Dark Blue wire on BR body.
  6. If suspect injector clicks, replace PCM. Perform TEST VER-2. If suspect injector does not click, repair open in suspect driver circuit between PCM and injector.
  7. Start engine. Allow it to reach normal operating temperature (more than 180°F). Individually, disconnect each injector connector while observing engine for a drop in RPM as injector is disconnected.
  8. If engine speed drops more than 50 RPM on all cylinders, test passed. Perform TEST VER-2. If engine speed does not drop more than 50 RPM on any cylinder, perform appropriate test. See INJECTOR DIAGNOSTIC TEST table below.

TEST NTC-5A - CHECKING COOLANT SENSOR CALIBRATION

  1. Start engine. Using scan tool, read coolant sensor value. If engine temperature is more than 180°F, allow engine to cool to 150°F. Observe scan tool and allow engine to reach normal operating temperature (more than 180°F). If coolant temperature value did not increase smoothly, check for mechanical cooling problems. Replace coolant sensor if mechanical cooling problems are not present. Perform TEST VER-2.
  2. If coolant temperature value increased smoothly, but did not increase to more than 180°F, check for mechanical cooling problems. Replace coolant sensor if mechanical cooling problems are not present. Perform TEST VER-2. If coolant temperature value increased smoothly to more than 180°F, coolant sensor is okay. Test is complete.

TEST NTC-6A - CHECKING TP SENSOR CALIBRATION

  1. Turn ignition switch to ON position, leaving engine off. Using scan tool, read Throttle Position (TP) sensor voltage. Ensure throttle is fully closed and against throttle stop. If voltage is more than 1.5 volts with throttle closed, replace TP sensor. Perform TEST VER-2. If voltage is less than 1.5 volts with throttle closed, observe scan tool voltage display and slowly open throttle to wide open position.
  2. If voltage does not change smoothly, replace TP sensor. Perform TEST VER-2. If voltage changes smoothly, and maximum voltage is less than 3.4 volts at wide open throttle, replace TP sensor. Perform TEST VER-2. If voltage changes smoothly, and maximum voltage is more than 3.4 volts at wide open throttle, TP sensor is okay. Test is complete.

TEST NTC-7A - CHECKING MAP SENSOR CALIBRATION

  1. Turn ignition off. Connect a vacuum gauge to a manifold vacuum source. Start engine and operate at idle. If engine will not idle, maintain a constant RPM more than idle. Using scan tool, read Manifold Absolute Pressure (MAP) sensor vacuum.
  2. Compare scan tool vacuum reading with vacuum gauge reading. If readings are not within one in. Hg of each other, replace MAP sensor. Perform TEST VER-2. If readings are within one in. Hg of each other, MAP sensor is okay. Test is complete.

TEST NTC-8A - CHECKING OXYGEN SENSOR SWITCHING

  1. Operate engine at normal operating temperature. Using scan tool, read Oxygen Sensor (O2S) state. If O2S state switches, O2S is okay. Test is complete. If O2S state does not switch and sensor is locked on lean, go to TEST NTC-8B. If O2S state does not switch and sensor is not locked on lean, turn ignition off. NOTE: Before opening any part of Compressed Natural Gas (CNG) fuel system for repair, fuel pressure must be released. See «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) .
  2. If vehicle is equipped with a fuel rail test port, install a 0-300 psi pressure test gauge to fuel rail test port and go to next step. If vehicle is not equipped with a fuel rail test port, release fuel pressure. See «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) . Connect a 0-300 psi pressure test gauge between Compressed Natural Gas (CNG) low pressure sensor and fuel rail block. Reinstall CNG low pressure sensor to test gauge tee connection. Turn ignition on.
  3. Using scan tool, actuate fuel system. Allow pressure test gauge to stabilize to normal fuel pressure. Stop actuation test. Observe pressure test gauge for 10 seconds. If fuel pressure is less than 10 psi, replace leaking injectors or "O" rings as necessary. Perform TEST VER-2.
  4. If fuel pressure is more than 10 psi, inspect air cleaner filter and inlet ducts for restrictions. Repair as necessary. Perform TEST VER-2. If restrictions are not present, go to TEST NTC-15A.
  5. Turn ignition on. Using scan tool, monitor fuel pressure for 10 seconds. If fuel pressure drops more than 5 psi, go to next step. If fuel pressure does not drop more than 5 psi, inspect air cleaner filter and inlet ducts for restrictions. Repair as necessary. Perform TEST VER-2. If restrictions are not present, go to TEST NTC-15A.
  6. Inspect fuel rail and fuel lines for leaks. Release fuel pressure and repair as necessary. Perform TEST VER-2. If Fuel rail and fuel lines are okay, release fuel pressure and replace leaking injectors or "O" rings as necessary. Perform TEST VER-2.

TEST NTC-8B - CHECKING OXYGEN SENSOR SWITCHING

  1. Operate engine at idle. Check engine for any abnormal vacuum conditions. Repair any abnormal vacuum conditions as necessary. Perform TEST VER-2. If no abnormal vacuum conditions are present, using scan tool, read Oxygen Sensor (O2S) signal voltage. If voltage is more than 0.1 volt, go to step 3).
  2. 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, O2S signal circuit (Black/Dark Green wire). If resistance is less than 5 ohms, repair short to ground in Black/Dark Green wire or Dark Green/White wire. Perform TEST VER-2. If resistance is more than 5 ohms, replace O2S. Perform TEST VER-2.
  3. Turn ignition off. Replace O2S. Turn ignition on. Using scan tool, reset adaptive fuel memory. Start engine and allow it to reach normal operating temperature. Using scan tool, read O2S state. Is O2S switches, test is compete. Perform TEST VER-2. If O2S does not switch, go to TEST NTC-15A.

TEST NTC-9A - CHECKING OXYGEN SENSOR HEATER

  1. Turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) fuel system. Wait 2 minutes for Oxygen Sensor (O2S) voltage to stabilize. Using scan tool, read O2S voltage. If voltage is 0.4-0.6 volt, system is functioning properly. Test is complete.
  2. If voltage is not 0.4-0.6 volt, disconnect O2S connector. Ensure scan tool is still actuating ASD fuel system. Using scan tool in voltmeter mode, check voltage on O2S connector, ASD relay 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.
  3. If voltage is more than 10 volts, stop actuator test. Using scan tool in ohmmeter mode, check resistance of O2S connector, heater ground circuit (Black wire on AB and AN bodies; Black/White wire on BR body). If resistance is more than 5 ohms, repair open Black wire or Black/White wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace O2S. Perform TEST VER-2.

TEST NTC-10A - CHECKING IDLE AIR CONTROL MOTOR

  1. Using scan tool, set engine speed to 1100 RPM. If engine speed set at 1050-1150 RPM, idle speed 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 motor connector.
  2. Using scan tool in voltmeter mode, check voltage on idle air control 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-10B. If voltage is more than one volt, go to next step.
  3. Using scan tool, check voltage on idle air control 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-10B. If voltage is more than one volt, go to next step.
  4. Using scan tool, check voltage on idle air control 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-10B. If voltage is more than one volt, go to next step.
  5. Using scan tool, check voltage on idle air control 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-10B. 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 idle air control motor. Perform TEST VER-2.

TEST NTC-10B - CHECKING IDLE AIR CONTROL MOTOR

  1. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector. Repair as necessary. Using an external ohmmeter, check resistance of each IAC motor circuit between PCM connector and IAC motor connector. See CHECKING IAC MOTOR CIRCUITS FOR RESISTANCE table blow. CHECKING IAC MOTOR CIRCUITS FOR RESISTANCE PCM Connector IAC Motor Connector Terminal No. 40 IAC No. 1 Driver (Brown/White Wire) Terminal No. 60 IAC No. 2 Driver (Yellow/Black Wire) Terminal No. 39 IAC No. 3 Driver (Gray/Red Wire) Terminal No. 59 IAC No. 4 Driver (Violet/Black Wire)
  2. If resistance is more than 5 ohms on any circuit, repair open in suspected wire. Perform TEST VER-2. If resistance is less than 5 ohms on all circuits, replace PCM. Perform TEST VER-2.

TEST NTC-11A - CHECKING SOLENOID OPERATIONS

Using scan tool, actuate Exhaust Gas Recirculation (EGR) solenoid. Touch top of EGR solenoid and feel for operation. If EGR solenoid does not operate, replace EGR solenoid. Perform TEST VER-2. If EGR solenoid operates, EGR solenoid is okay. Test is complete.

TEST NTC-12A - CHECKING PARK/NEUTRAL SWITCH

  1. Using scan tool, read park/neutral switch input state. Observe scan tool display while moving gear selector in and out of Park and Reverse positions. If scan tool displays P/N and D/R, park/neutral switch is okay. Test is complete. If scan tool does not display P/N and D/R, turn ignition off.
  2. Put gear selector in Park position. Disconnect and inspect Powertrain Control Module (PCM) connector. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
  3. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 30, park/neutral position switch sense circuit (Brown/Orange wire on AB body; Brown/Yellow wire on AN body). Observe scan tool display while moving gear selector in and out of Park and Reverse positions.
  4. If scan tool resistance display changes from less than 5 ohms to more than 5 ohms, replace PCM. Perform TEST VER-2. If scan tool resistance display remains less than 5 ohms at all times, repair short to ground in Brown/Orange wire or Brown/Yellow wire. Perform TEST VER-2.
  5. If scan tool resistance display fluctuates to more than and less than 5 ohms, turn ignition off. Disconnect and inspect park/neutral switch connector. Repair as necessary. Using an external ohmmeter, check resistance of park/neutral switch sense circuit (Brown/Orange wire on AB body; Brown/Yellow wire on AN body) between PCM connector terminal No. 30 and park/neutral switch connector.
  6. If resistance is less than 10 ohms, replace park/neutral switch. Perform TEST VER-2. If resistance is more than 10 ohms, repair open in Brown/Orange wire or Brown/Yellow wire. Perform TEST VER-2.

TEST NTC-13A - CHECKING PCM GROUNDS & POWER CIRCUIT

  1. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector. Repair as necessary. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 5, signal ground circuit (Black/White wire). If resistance is more than 5 ohms, repair open in Black/White wire. Perform TEST VER-2.
  2. If resistance is less than 5 ohms, check resistance of PCM connector terminal No. 11, power ground circuit (Black/Tan wire), using scan tool. If resistance is more than 5 ohms, repair open in Black/Tan wire. Perform TEST VER-2.
  3. If resistance is less than 5 ohms, check resistance of PCM connector terminal No. 12, power ground circuit (Black/Tan wire), using scan tool. If resistance is more than 5 ohms, repair open in Black/Tan wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, put scan tool in voltmeter mode. Turn ignition on. Using scan tool, check voltage on PCM connector terminal No. 9, ignition 12-volt feed 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 in Dark Blue wire, Dark Blue/White wire or Light Green/Black wire. Perform TEST VER-2.
  5. If voltage is more than 10 volts, turn ignition off. Reconnect PCM connector. PCM grounds and power circuits are okay. Test is compete.

TEST NTC-14A - CHECKING EGR SYSTEM

  1. Disconnect Exhaust Gas Recirculation (EGR) solenoid vacuum supply hose. Connect a vacuum gauge to disconnected EGR vacuum supply hose. Start engine and operate at idle. If vacuum gauge indicates more than 10 in. Hg of vacuum at idle, go to step 3). If vacuum gauge does not indicate more than 10 in. Hg of vacuum at idle, disconnect EGR vacuum supply hose at intake manifold.
  2. Connect a vacuum gauge to intake manifold nipple. Operate engine at idle and read vacuum gauge. If vacuum gauge indicates more than 10 in. Hg of vacuum at idle, repair restriction or leak in vacuum supply hose between intake manifold and EGR solenoid. Perform TEST VER-2. If vacuum gauge does not indicate more than 10 in. Hg of vacuum at idle, repair plugged vacuum nipple at throttle body. Perform TEST VER-2.
  3. Disconnect vacuum gauge. Reconnect EGR solenoid vacuum supply hose. Disconnect EGR valve hose. Connect a vacuum gauge to disconnected EGR valve hose. Observe vacuum gauge and momentarily snap throttle open. If vacuum gauge does not indicate more than 5 in. Hg of vacuum with throttle open, replace EGR valve assembly. Perform TEST VER-2.
  4. If vacuum gauge indicates more than 5 in. Hg of vacuum with throttle open, disconnect EGR valve back pressure signal tube. Adjust shop air hose to 20 psi. Turn ignition off. Connect shop air hose to nipple on base of EGR valve. Listen for a tone change while opening and closing throttle. If tone changes, replace EGR valve assembly. Perform TEST VER-2.
  5. If tone does not change, remove vacuum gauge. Cap open nipple on base of EGR valve. Connect a hand vacuum pump to EGR valve. Start engine. Listen for a speed change while slowly applying vacuum to EGR valve. If engine speed does not change, replace EGR valve assembly. Perform TEST VER-2.
  6. If engine speed changes, turn ignition off. Apply 10 in. Hg of vacuum and hold for 30 seconds. If vacuum holds for 30 seconds, EGR system is okay. Test is complete. If vacuum does not hold for 30 seconds, replace EGR valve assembly. Perform TEST VER-2.

TEST NTC-15A - CHECKING ENGINE VACUUM

Connect a vacuum gauge to engine. Operate engine at idle. Observe vacuum gauge reading with engine at idle. Normal vacuum reading will vary according to altitude. If vacuum gauge reading is not 13-22 in. Hg steady, go to TEST NTC-16A. If vacuum gauge reading is 13-22 in. Hg steady, engine vacuum is okay. Test is complete.

TEST NTC-16A - PERFORMING NO DTC MECHANICAL TEST

  1. Engine controller systems are operating properly and are not cause of driveability problem. Perform following additional checks to assist in identifying a possible mechanical problem: Engine vacuum (must be at least 13 in. Hg in Neutral). Engine valve timing (must be within specification). Engine compression (must be within specification). Engine exhaust system (must be free of restrictions). Engine PCV system (must flow freely). Engine drive sprocket (must be properly positioned). Torque converter stall speed (must be within specification). Power brake booster (must be free of internal vacuum leaks). Fuel (must be free of contamination). Fuel injector (check for plugged or restricted injector or control wire not connected to correct injector).
  2. If a rich or lean condition of oxygen sensor has brought you to TEST NTC-16A, and one of above items is not cause of rich or lean condition, replace Powertrain Control Module (PCM). Perform TEST VER-2.

TEST NS-1A - INSPECTING FUEL SYSTEM

Note. Perform VISUAL INSPECTION in this article before proceeding.

  1. Turn ignition off. Ensure fuel cylinders are at least 1/4 full. Check position of manual shutoff valve. If manual shutoff valve is closed, open valve. Perform TEST VER-1. If manual shutoff valve is open, check position of all fuel cylinder manual control valves. Fuel cylinder manual control valves should be fully counterclockwise when they are open.
  2. If fuel cylinder manual control valves are closed, open valves. Perform TEST VER-1. If fuel cylinder manual control valves are open, turn ignition on. Using scan tool, actuate Auto Shutdown (ASD) relay. Touch ASD relay. If ASD relay is not pulsating, go to TEST NS-2A.
  3. If ASD relay is pulsating, touch fuel shutoff relay. If fuel shutoff relay is not pulsating, go to TEST NS-2B. If fuel shutoff relay is pulsating, touch low pressure fuel shutoff solenoid. If low pressure fuel shutoff solenoid is not pulsating, go to TEST NS-2C. If low pressure fuel shutoff solenoid is pulsating, touch high pressure fuel shutoff solenoid.
  4. If solenoid is not pulsating, go to TEST NS-2D. If solenoid is pulsating, ensure fuel gauge indicates fuel is present. Using scan tool, read fuel pressure. If pressure is less than 90 psi, go to TEST NS-1B. If pressure is 90-134 psi, go to step 6). If pressure is more than 134 psi, go to next step.
  5. Release fuel pressure. If vehicle is equipped with fuel rail test port, connect a 0-300 psi fuel pressure test gauge to test port. On vehicles not equipped with fuel rail test port, remove Compressed Natural Gas (CNG) low pressure sensor. Connect a 0-300 psi pressure test gauge between CNG low pressure sensor and fuel rail block. Install CNG low pressure sensor to test gauge tee connection. If CNG low pressure sensor is not reinstalled, engine will start, then stall.
  6. On all models, using scan tool, actuate fuel system. If fuel pressure is more than 140 psi, turn ignition off. Replace fuel pressure regulator. Perform TEST VER-1. If fuel pressure is less than 90 psi, stop actuation test using scan tool. On vehicles not equipped with fuel rail test port, release fuel pressure. Reinstall CNG low pressure sensor.
  7. On all models, ensure throttle is not being held open. If throttle is held open, repair condition causing throttle to be held open. Perform TEST VER-1. If throttle is not held open, read Throttle Position (TP) sensor voltage using scan tool. If voltage is less than 1.5 volts, go to step 9).
  8. If voltage is more than 1.5 volts, turn ignition off. Disconnect and inspect TP sensor connector for damaged, pushed-out or miswired terminals. Repair connector as necessary. Perform TEST VER-1. If connector is okay, replace TP sensor. Perform TEST VER-1.
  9. Disconnect fuel injector No. 1 connector. Using scan tool, actuate fuel system. Using scan tool in voltmeter mode, check voltage on fuel injector No. 1 connector, ASD relay output circuit (Dark Green/Orange wire). If voltage is less than 10 volts, repair open in Dark Green/Orange wire. Perform TEST VER-1.
  10. If voltage is more than 10 volts, reconnect injector connector. Disconnect CNG low pressure shutoff solenoid connector. Using scan tool, immediately read fuel pressure. If fuel pressure is less than 10 psi, go to next step. If fuel pressure is more than 10 psi, reconnect CNG low pressure shutoff solenoid connector. go to TEST NS-4A.
  11. Using scan tool, stop actuation test. Reconnect low pressure fuel shutoff solenoid connector. Using scan tool, actuate fuel system. Using scan tool, stop actuation test. Using scan tool, immediately read fuel pressure. If fuel pressure is more than 10 psi, go to TEST NS-3A.
  12. If fuel pressure is less than 10 psi, remove air cleaner assembly. Using scan tool, actuate fuel system. Hold throttle open and listen for escaping gas. If escaping gas is heard from throttle area, turn ignition off. Release fuel pressure. Repair leaking fuel injector. Perform TEST VER-1.
  13. If escaping gas is not heard from throttle, fuel leak has been isolated to fuel rail area. Turn ignition off. Release fuel pressure. Repair fuel rail as necessary. Perform TEST VER-1.

TEST NS-1B - INSPECTING FUEL SYSTEM

  1. Using scan tool, stop actuation test. Disconnect and inspect Compressed Natural Gas (CNG) low pressure sensor connector. Repair as necessary. Connect a jumper wire to CNG low pressure sensor connector between 5-volt power supply circuit (Violet/White wire) and CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies). Using scan tool, read fuel pressure. If fuel pressure is less than 130 psi, go to step 6).
  2. If fuel pressure is more than 130 psi, check all fuel lines for kinks or restrictions. Repair kinks or restrictions. Perform TEST VER-1. If no kinks or restrictions are present, turn ignition off. NOTE: Before opening any part of Compressed Natural Gas (CNG) fuel system for repair, fuel pressure must be released. See «FUEL PRESSURE RELEASE»(/dodge/ram-wagon-b3500/1991-2000/remont/testing-diagnostics/#engine-controls-tests-wcodes-52l-cng__fuel-pressure-release) .
  3. Release fuel pressure. If vehicle is equipped with fuel rail test port, connect a 0-300 psi fuel pressure test gauge to test port. On vehicles not equipped with fuel rail test port, remove Compressed Natural Gas (CNG) low pressure sensor. Connect a 0-300 psi pressure test gauge between CNG low pressure sensor and fuel rail block. Install CNG low pressure sensor to test gauge tee connection. If CNG low pressure sensor is not reinstalled, engine will start, then stall.
  4. On all models, using scan tool, actuate fuel system. If fuel pressure is more than 90 psi, release fuel pressure. Replace fuel pressure sensor. Perform TEST VER-1. If pressure is less than 90 psi, release fuel pressure. Replace fuel filter.
  5. Attempt to start engine. If engine starts, test is complete. Perform TEST VER-1. If engine does not start, replace fuel pressure regulator. Perform TEST VER-1.
  6. Remove jumper wire. Using scan tool in voltmeter mode, check voltage on CNG low pressure sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is less than 4.5 volts, repair open in Violet/White wire. Perform TEST VER-1. If voltage is more than 4.5 volts, turn ignition off.
  7. Disconnect and inspect Powertrain Control Module (PCM) connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool in ohmmeter mode, check resistance of CNG low pressure sensor connector, CNG low pressure sensor signal circuit (Dark Green/Orange wire on AB body; Dark Green/Light Blue wire on AN and BR bodies). If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire or Dark Green/Light Blue wire. Perform TEST VER-1. If resistance is more than 5 ohms, replace PCM. Perform TEST VER-1.

TEST NS-2A - INSPECTING FUEL RELAYS & SOLENOIDS

  1. Turn ignition off. Disconnect and inspect Auto Shutdown (ASD) relay connector. Repair as necessary. Perform TEST VER-1. If connector is okay, turn ignition on. Using scan tool in voltmeter mode, check voltage on ASD relay connector, ignition 12-volt feed 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 in Dark Blue wire, Dark Blue/White wire or Light Green/Black wire. Perform TEST VER-1.
  2. If voltage is more than 10 volts, replace ASD relay with a known-good relay. Attempt to start engine. If engine does not start, repair open in Dark Blue/Yellow wire. Perform TEST VER-1. If engine starts, replace ASD relay. Perform TEST VER-1.

TEST NS-2B - INSPECTING FUEL RELAYS & SOLENOIDS

  1. Turn ignition off. Disconnect and inspect high pressure fuel shutoff solenoid relay connector. Repair as necessary. Perform TEST VER-1. If connector is okay, turn ignition on. Using scan tool in voltmeter mode, check voltage on high pressure fuel shutoff solenoid relay connector, ignition 12-volt feed 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 in Dark Blue wire, Dark Blue/White wire or Light Green/Black wire. Perform TEST VER-1.
  2. If voltage is more than 10 volts, replace high pressure fuel shutoff solenoid relay with a known-good relay. Attempt to start engine. If engine does not start, repair open in Dark Blue/Yellow wire. Perform TEST VER-1. If engine starts, replace fuel high pressure fuel shutoff solenoid relay. Perform TEST VER-1.

TEST NS-2C - INSPECTING FUEL RELAYS & SOLENOIDS

  1. Turn ignition off. Disconnect and inspect low pressure fuel shutoff solenoid connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool in ohmmeter mode, check resistance of low pressure fuel shutoff solenoid connector, power ground circuit (Black wire). If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-1.
  2. If resistance is less than 5 ohms, using scan tool, actuate fuel system. Using scan tool in voltmeter mode, check voltage on low pressure fuel shutoff solenoid connector, ASD relay output circuit (Dark Green/Orange wire). If voltage is more than 10 volts, replace low pressure fuel shutoff solenoid. Perform TEST VER-1.
  3. If voltage is less than 10 volts, turn ignition off. Disconnect and inspect Auto Shutdown (ASD) relay connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool, check voltage on ASD relay connector, battery positive (B+) circuit (Red/White wire). If voltage is less than 10 volts, repair open in Red/White wire from battery to ASD relay. Perform TEST VER-1.
  4. If voltage is more than 10 volts, use an external ohmmeter to check resistance of ASD relay output circuit (Dark Green/Orange wire) between ASD relay connector and low pressure fuel shutoff solenoid connector. If resistance is more than 5 ohms, repair open in Dark Green/Orange wire from ASD relay to low pressure fuel shutoff solenoid. Perform TEST VER-1. If resistance is less than 5 ohms, replace ASD relay. Perform TEST VER-1.

TEST NS-2D - INSPECTING FUEL RELAYS & SOLENOIDS

  1. Turn ignition off. Disconnect and inspect high pressure fuel shutoff solenoid connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool in ohmmeter mode, check resistance of high pressure fuel shutoff solenoid connector, power ground circuit (Black wire). If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-1.
  2. If resistance is less than 5 ohms, actuate fuel system using scan tool. Using scan tool in voltmeter mode, check voltage on high pressure fuel shutoff solenoid connector, fuel shutoff relay output circuit (Dark Green/Black wire). If voltage is more than 10 volts, replace high pressure fuel shutoff solenoid. Perform TEST VER-1.
  3. If voltage is less than 10 volts, turn ignition off. Disconnect and inspect fuel shutoff relay connector. Repair as necessary. Using scan tool, check voltage on fuel shutoff relay connector, battery positive (B+) circuit (Dark Green/White wire on). If voltage is less than 10 volts, repair open in Dark Green/White wire from battery to fuel shutoff relay. Perform TEST VER-1.
  4. If voltage is more than 10 volts, use an external ohmmeter to check resistance of fuel shutoff relay output circuit (Dark Green/Black wire) between fuel shutoff relay connector and high pressure fuel shutoff solenoid connector. If resistance is more than 5 ohms, repair open in Dark Green/Black wire from fuel shutoff relay to high pressure fuel shutoff solenoid. Perform TEST VER-1. If resistance is less than 5 ohms, replace fuel shutoff relay. Perform TEST VER-1.

TEST NS-3A - CORRECTING FUEL PRESSURE LOSS

Note. A fuel injector control circuit is shorted to ground causing engine to flood.

  1. Using scan tool, read DTCs. If any Fuel Injector (FI) DTCs are present, go to TEST TC-37A and perform appropriate test. If no injector DTCs are present, go to next step.
  2. Disconnect and inspect PCM connector. Repair as necessary. Perform TEST VER-1. If connector is okay, disconnect each FI connector. Go to next step.
  3. Using scan tool in ohmmeter mode, test each FI driver circuit for short to ground. See FUEL INJECTOR CONNECTOR TERMINAL IDENTIFICATION table below. If any driver circuit is shorted to ground, repair appropriate circuit. Perform TEST VER-1. If no driver circuits are shorted to ground, replace PCM. Perform TEST VER-1.
Terminal No.FunctionWire Color
1ASD Relay OutputDark Green/Orange)
2Injector No. 1 Driver(1) White/Dark Blue
2Injector No. 2 Driver(2) Tan
2Injector No. 3 Driver(3) Yellow/White
2Injector No. 4 Driver(4) Light Blue/Brown
2Injector No. 5 Driver(5)
2Injector No. 6 Driver(6)
2Injector No. 7 Driver(7) Dark Blue/Tan
2Injector No. 8 Driver(8)
(1) White/Brown wire on AB body. (2) White wire on AB body. (3) White/Yellow wire on AB body. (4) White/Light Blue wire on AB body. (5) White/Black wire on AB body; Pink/Black wire on AN body; Gray wire on BR body. (6) White/Red wire on AB body; Light Green/Black wire on AN body; Brown/Dark Blue wire on BR body. (7) White/Tan wire on AB body. (8) White/Gray wire on AB body; Dark Blue/Gray wire on AN body; Red/Yellow wire on BR body.
(1)White/Brown wire on AB body.
(2)White wire on AB body.
(3)White/Yellow wire on AB body.
(4)White/Light Blue wire on AB body.
(5)White/Black wire on AB body; Pink/Black wire on AN body; Gray wire on BR body.
(6)White/Red wire on AB body; Light Green/Black wire on AN body; Brown/Dark Blue wire on BR body.
(7)White/Tan wire on AB body.
(8)White/Gray wire on AB body; Dark Blue/Gray wire on AN body; Red/Yellow wire on BR body.

FUEL INJECTOR CONNECTOR TERMINAL IDENTIFICATION

TEST NS-4A - INSPECTING IGNITION

  1. Turn ignition off. Disconnect any spark plug cable at spark plug. Insert insulated screwdriver in spark plug cable terminal. CAUTION: Damage to Powertrain Control Module (PCM) may occur if screwdriver is held more than 1/4" from ground
  2. Hold screwdriver within 1/4" of a good ground. Watch for spark while cranking engine for 10 seconds. Ensure spark is present. One or 2 sparks is considered a no-spark condition. If good spark is not present, go to next step. If good spark is present and engine starts and stalls repeatedly, go to TEST NS-7A. If good spark is present and engine does not start, go to TEST NS-5A.
  3. Reconnect spark plug cable. CAUTION: Damage to Powertrain Control Module (PCM) may occur if coil secondary cable is held more than 1/4" from ground
  4. Turn ignition off. Remove coil secondary cable from distributor. Hold coil secondary cable within 1/4" of a good ground. Watch for spark while cranking engine for 10 seconds. Ensure spark is present. One or 2 sparks is considered a no-spark condition. If good spark is present, repair secondary ignition (distributor cap, rotor, cables). Perform TEST VER-1.
  5. If good spark is not present, turn ignition off. Remove coil secondary cable. Using an external ohmmeter, check resistance of coil secondary cable. If resistance is more than 15 k/ohms, replace coil secondary cable. Perform TEST VER-1.
  6. If resistance is less than 15 k/ohms, remove distributor cap. Watch rotor turn while cranking engine for 10 seconds. If rotor does not turn with engine cranking, repair distributor drive system. Perform TEST VER-1.
  7. If rotor turns with engine cranking, reinstall distributor cap and ignition coil cable. Disconnect and inspect Crankshaft Position (CKP) sensor connector. Repair connector as necessary. Perform TEST VER-1. If connector is okay, go to next step.
  8. Turn ignition on. Using scan tool in voltmeter mode, check voltage on CKP sensor connector, 8-volt supply circuit (Orange wire). If voltage is more than 7 volts, go to step 11).
  9. If voltage is less than 7 volts, disconnect and inspect Camshaft Position (CMP) sensor connector. Repair connector as necessary. Perform TEST VER-1. If connector is okay, 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-1.
  10. If voltage is less than 7 volts, turn ignition off. Disconnect and inspect PCM connector. Repair connector as necessary. Perform TEST VER-1. If connector is okay, put scan tool in ohmmeter mode. Using scan tool, check resistance of PCM connector terminal No. 7, 8-volt supply circuit (Orange wire). If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Orange wire. Perform TEST VER-1.
  11. Reconnect CKP sensor connector. Disconnect and inspect Camshaft Position (CMP) sensor connector. Repair connector as necessary. Perform TEST VER-1. If connector is okay, check voltage on CMP sensor connector, 8-volt supply circuit (Orange wire). If voltage is more than 7 volts, go to step 13).
  12. If voltage is less than 7 volts, turn ignition off. Disconnect PCM connector. Using an external ohmmeter, check resistance of 8-volt supply circuit (Orange wire) between PCM connector terminal No. 7 and CMP sensor connector. If resistance is less than 5 ohms, replace CKP sensor. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Orange wire. Perform TEST VER-1.
  13. Disconnect and inspect ignition coil connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-1. If connector is okay, turn ignition on. Using scan tool, actuate fuel system.
  14. 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. Perform TEST VER-1.
  15. If voltage is more than 10 volts, check voltage on ignition coil connector, ignition coil driver circuit (Gray wire). If voltage is more than 10 volts, go to step 20). If voltage is less than 10 volts, turn ignition off.
  16. Disconnect and inspect PCM connector. Repair as necessary. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 19, ignition coil driver circuit (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 or Black/Gray wire. Perform TEST VER-1.
  17. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of ignition coil driver circuit (Gray wire on AB and AN bodies; Black/Gray wire on BR body) between PCM connector terminal No. 19 and ignition coil connector. If resistance is more than 5 ohms, repair open in Gray wire or Black/Gray wire from PCM to ignition coil. Perform TEST VER-1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1. NOTE: Following steps require an analog voltmeter capable of reading a 0.1 volt pulsation.
  18. Using scan tool, stop actuation test. Check valve timing. Correct valve timing as necessary. Perform TEST VER-1. If valve timing is okay, connect an analog voltmeter between ignition coil connector, ASD relay output circuit (Dark Green/Orange wire) and ground.
  19. Using scan tool, actuate ignition coil. If voltmeter pulsates, replace ignition coil. Perform TEST VER-1. If voltmeter does not pulsate, replace PCM. Perform TEST VER-1.

TEST NS-5A - INSPECTING MECHANICAL SYSTEM

  1. Turn ignition off. Disconnect and inspect Manifold Absolute Pressure (MAP) sensor connector. Repair as necessary. Perform TEST VER-1. If connector is okay, turn ignition on. Using scan tool in voltmeter mode, check voltage on MAP sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is less than 4.5 volts, repair open in Violet/White wire. Perform TEST VER-1.
  2. If voltage is more than 4.5 volts, reconnect MAP sensor connector. Check spark plug cables for proper placement. Reinstall spark plug cables as necessary. Perform TEST VER-1. If spark plug cable placement is okay, turn ignition off. Check valve timing. Adjust valve timing as necessary. Perform TEST VER-1.
  3. If valve timing is within specification, check engine compression. Repair engine compression as necessary. Perform TEST VER-1. If engine compression is within specification, replace MAP sensor. Perform TEST VER-1.

TEST NS-6A - CORRECTING NO RESPONSE CONDITION

  1. If engine starts, go to TEST NS-6B. If engine does not start, turn ignition off. Disconnect and inspect Throttle Position (TP) sensor connector. Repair as necessary. Perform TEST VER-1. If connector is okay, turn ignition on. Using scan tool in voltmeter mode, check voltage on TP sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is more than 6 volts, repair open in power ground circuits of Powertrain Control Module (PCM) connector terminals No. 11 and 12 (Black/Tan wires).
  2. If voltage is less than 4.4 volts, go to next step. If voltage is more than 4.4 but less than 6 volts, turn ignition off. Reconnect TP sensor connector. Disconnect and inspect Manifold Absolute Pressure (MAP) sensor connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool, check voltage on MAP sensor connector, 5-volt power 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.
  3. Turn ignition off. Disconnect and inspect Manifold Absolute Pressure (MAP) sensor connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool, check voltage on TP sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is more than 4.4 volts, replace MAP sensor. Perform TEST VER-1.
  4. If voltage is less than 4.4 volts, turn ignition off. Disconnect and inspect Compressed Natural Gas (CNG) low pressure sensor connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool, check voltage on TP sensor connector, 5-volt power supply circuit (Violet/White wire). If voltage is more than 4.4 volts, replace CNG low pressure sensor. Perform TEST VER-1.
  5. If voltage is less than 4.4 volts, turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 6, 5-volt power supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair short to ground in Violet/White wire. Perform TEST VER-1.
  6. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of PCM connector between terminals No. 4, sensor ground circuit (Black/Light Blue wire), and No. 6, 5-volt power supply circuit (Violet/White wire). If resistance is less than 5 ohms, repair Violet/White wire for a short to Black/Light Blue wire. Perform TEST VER-1.
  7. If resistance is more than 5 ohms, turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 9, ignition 12-volt feed 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 in Dark Blue wire, Dark Blue/White wire or Light Green/Black wire from PCM to ignition switch. Perform TEST VER-1.
  8. If voltage is more than 10 volts, check voltage on PCM connector terminal No. 3, battery positive (B+) 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.
  9. If voltage is less than 10 volts, remove battery positive (B+) fuse from Power Distribution Center (PDC). If fuse is blown, go to step 11). If fuse is okay, using scan tool, check voltage on PDC fuse connector, battery positive (B+) circuit (Red wire on AB body; Red/White wire on AN and BR bodies).
  10. If voltage is more than 10 volts, repair open Red wire or Red/White wire from PDC to PCM terminal No. 3. Perform TEST VER-1. If voltage is less than 10 volts, repair Red wire or Red/White wire from PDC to battery. Perform TEST VER-1.
  11. Turn ignition off. Remove and inspect Auto Shutdown (ASD) relay and high pressure fuel shutoff solenoid relay. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 3, battery positive (B+) 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 wire or Red/White wire. Perform TEST VER-1.
  12. If resistance is more than 5 ohms, disconnect and inspect Oxygen Sensor (O2S) connector. Repair as necessary. Perform TEST VER-1. If connector is okay, using scan tool, check resistance of White wire on O2S (component side), ASD relay output circuit (terminal No. 4 on AB, AN and BR bodies). If resistance is more than 5 ohms, replace O2S. Perform TEST VER-1.
  13. If resistance is less than 5 ohms, go to step 16).
  14. If resistance is more than 5 ohms, ensure O2S connector is still disconnected. Using scan tool, check resistance of high pressure fuel shutoff relay connector, fuel shutoff relay output circuit (Dark Green/Black wire). If resistance is more than 5 ohms, condition causing fusible link to short is not present at this time. Replace fusible link. Perform TEST VER-1.
  15. If resistance is less than 5 ohms, remove high pressure fuel shutoff solenoid connector. Using scan tool, check resistance of high pressure fuel shutoff solenoid relay connector, relay output circuit (Dark Green/Black wire). If resistance is less than 5 ohms, repair short to ground in Dark Green/Black wire. Replace ENGINE fuse. Perform TEST VER-1. If resistance is more than 5 ohms, release fuel pressure. Replace high pressure fuel shutoff solenoid. Replace ENGINE fuse. Perform TEST VER-1.
  16. On all bodies, 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 B+ fuse or ENGINE fuse. Perform TEST VER-1.
  17. If resistance is less than 5 ohms, turn ignition off. Disconnect alternator field connector from alternator. 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 alternator. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  18. If resistance is less than 5 ohms, turn ignition off. Disconnect fuel injector No. 1 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, release fuel pressure. Replace fuel injector No. 1. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  19. If resistance is less than 5 ohms, disconnect fuel injector No. 2 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, release fuel pressure. Replace fuel injector No. 2. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  20. If resistance is less than 5 ohms, disconnect fuel injector No. 3 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, release fuel pressure. Replace fuel injector No. 3. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  21. If resistance is less than 5 ohms, disconnect fuel injector No. 4 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, release fuel pressure. Replace fuel injector No. 4. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  22. If resistance is less than 5 ohms, disconnect fuel injector No. 5 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, release fuel pressure. Replace fuel injector No. 5. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  23. If resistance is less than 5 ohms, disconnect fuel injector No. 6 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, release fuel pressure. Replace fuel injector No. 6. Replace B+ fuse or ENGINE fuse. Perform TEST VER-1.
  24. If resistance is less than 5 ohms, go to next step.
  25. Disconnect fuel injector No. 7 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, release fuel pressure. Replace fuel injector No. 7. Replace B+ fuse. Perform TEST VER-1. If resistance is less than 5 ohms, go to next step.
  26. Disconnect fuel injector No. 8 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, release fuel pressure. Replace fuel injector No. 8. Replace B+ fuse. Perform TEST VER-1. If resistance is less than 5 ohms, repair short to ground in Dark Green/Orange wire. Perform TEST VER-1.

TEST NS-6B - CORRECTING NO RESPONSE CONDITION

  1. If ignition was not on when NO RESPONSE message was displayed, turn ignition switch to ON position to get a response. Test is complete. If ignition was on when NO RESPONSE message was displayed, turn ignition off. Disconnect scan tool from Data Link Connector (DLC). Disconnect and inspect Powertrain Control Module (PCM) connector. Repair as necessary.
  2. Using an external ohmmeter, check resistance of DLC Serial Communications Interface (SCI) transmit circuit (Pink wire). If resistance is less than 5 ohms, repair short to ground in Pink wire. Perform TEST VER-1. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of DLC SCI receive circuit (Light Green wire).
  3. If resistance is less than 5 ohms, repair short to ground in Light Green wire. Perform TEST VER-1. If resistance is more than 5 ohms, use an external ohmmeter to check resistance of SCI transmit circuit (Pink wire). between PCM connector terminal No. 25 and DLC. If resistance is more than 5 ohms, repair open in Pink wire. Perform TEST VER-1.
  4. If resistance is less than 5 ohms, use an external ohmmeter to check resistance of SCI receive circuit (Light Green wire) between PCM connector terminal No. 45 and DLC. If resistance is more than 5 ohms, repair open in Light Green wire. Perform TEST VER-1.
  5. If resistance is less than 5 ohms, connect scan tool to a known functional DLC on another vehicle. Turn ignition on. Using scan tool, read DTCs. If scan tool does not display NO RESPONSE, replace original vehicle's PCM. Perform TEST VER-1. If scan tool displays NO RESPONSE, replace scan tool cartridge with another cartridge.
  6. Using scan tool, read DTCs. If scan tool does not display NO RESPONSE, replace scan tool cartridge. If scan tool displays NO RESPONSE, replace scan tool adapter cable with another adapter cable. Using scan tool, read DTCs. 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-7A - INSPECTING IDLE AIR CONTROL MOTOR OPERATION

  1. While holding throttle 1/4 of way down, attempt to start engine. If engine does not start and stay running, go to TEST NS-8A. If engine starts and stays running, release throttle and turn ignition off. Disconnect and inspect Idle Air Control (IAC) motor connector. Repair as necessary. Turn ignition on.
  2. Using scan tool, actuate IAC motor. Using scan tool in voltmeter mode, check voltage on IAC motor connector, IAC No. 3 driver circuit (Gray/Red wire). If voltage is less than one volt, go to TEST NS-7B. If voltage is more than one volt, check voltage on IAC motor connector, IAC No. 1 driver circuit (Brown/White wire), using scan tool.
  3. If voltage is less than one volt, go to TEST NS-7C. If voltage is more than one volt, check voltage on IAC motor connector, IAC No. 4 driver circuit (Violet/Black wire), using scan tool. If voltage is less than one volt, go to TEST NS-7D. If voltage is more than one volt, use scan tool to check voltage on IAC motor connector, IAC No. 2 driver circuit (Yellow/Black wire). If voltage is less than one volt, go to TEST NS-7E.
  4. If voltage is more 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

  1. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. If connector is not okay, repair as necessary. Perform TEST VER-1.
  2. If connector is okay, use an external ohmmeter to check resistance of IAC No. 3 driver circuit (Gray/Red wire) between PCM connector terminal No. 39 and Idle Air Control (IAC) motor connector. If resistance is more than 5 ohms, repair open in Gray/Red wire. Perform TEST VER-1.
  3. If resistance is less than 5 ohms, turn ignition off. Reconnect PCM connector. Connect IAC motor connector to a known functional IAC motor. Turn ignition on. Using scan tool, actuate IAC motor. If IAC motor pintle moves in and out, replace IAC motor. Perform TEST VER-1. If IAC motor pintle does not move in and out, replace PCM. Perform TEST VER-1.

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

  1. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-1.
  2. If connector is okay, use an external ohmmeter to check resistance of IAC No. 1 driver circuit (Brown/White wire) between PCM connector terminal No. 40 and Idle Air Control (IAC) motor connector. If resistance is more than 5 ohms, repair open in Brown/White wire. Perform TEST VER-1.
  3. If resistance is less than 5 ohms, turn ignition off. Reconnect PCM connector. Connect IAC motor connector to a known functional IAC motor. Turn ignition on. Using scan tool, actuate IAC motor. If IAC motor pintle moves in and out, replace IAC motor. Perform TEST VER-1. If IAC motor pintle does not move in and out, replace PCM. Perform TEST VER-1.

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

  1. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-1.
  2. If connector is okay, use an external ohmmeter to check resistance of IAC No. 4 driver circuit (Violet/Black wire) between PCM connector terminal No. 59 and Idle Air Control (IAC) motor connector. If resistance is more than 5 ohms, repair open in Violet/Black wire. Perform TEST VER-1.
  3. If resistance is less than 5 ohms, turn ignition off. Reconnect PCM connector. Connect IAC motor connector to a known functional IAC motor. Turn ignition on. Using scan tool, actuate IAC motor. If IAC motor pintle moves in and out, replace IAC motor. Perform TEST VER-1. If IAC motor pintle does not move in and out, replace PCM. Perform TEST VER-1.

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

  1. Turn ignition off. Disconnect and inspect Powertrain Control Module (PCM) connector for damaged, pushed-out or miswired terminals. Repair as necessary. Perform TEST VER-1.
  2. If connector is okay, use an external ohmmeter to check resistance of IAC No. 2 driver circuit (Yellow/Black wire) between PCM connector terminal No. 60 and Idle Air Control (IAC) motor connector. If resistance is more than 5 ohms, repair open in Yellow/Black wire. Perform TEST VER-1.
  3. If resistance is less than 5 ohms, turn ignition off. Reconnect PCM connector. Connect IAC motor connector to a known functional IAC motor. Turn ignition on. Using scan tool, actuate IAC motor. If IAC motor pintle moves in and out, replace IAC motor. Perform TEST VER-1. If IAC motor pintle does not move in and out, replace PCM. Perform TEST VER-1.

TEST NS-8A - CORRECTING START & STALL CONDITION

Engine controller systems are operating properly and are not cause of driveability problem. Perform following additional checks to help identify a possible no-start condition problem. DO NOT overlook any of following conditions. Any of these conditions may produce a no-start condition. Check all related Tech Service Bulletins (TSBs) and perform corrective action as necessary.

  1. Engine valve timing (must be within specification).
  2. Engine compression (must be within specification).
  3. Engine exhaust system (must be free of restrictions).
  4. Engine PCV system (must flow freely).
  5. Engine drive sprocket (must be properly positioned).
  6. Fuel (must be free of contamination).
  7. Engine secondary ignition check (must exhibit a normal scope pattern).

TEST NS-9A - REPAIRING NO CRANK CONDITION

  1. Ensure transmission is in Park position. Using scan tool, read Park/Neutral (P/N) switch sense. If scan tool does not display PARK, repair open P/N switch, ground circuit (Brown/Orange wire on AB body; Brown/Yellow wire on AN body; Black/White wire on BR body). Perform TEST VER-1.
  2. If scan tool displays PARK, disconnect starter relay connector. Using scan tool in voltmeter mode, check voltage on starter relay connector, fused battery circuit (Black wire on AB and AN bodies; Pink/Black wire on BR body). If voltage is less than 11.6 volts, repair open Black wire, Red/Yellow wire, or Pink/Black wire. Perform TEST VER-1.
  3. If voltage is more than 11.6 volts, check voltage on starter relay connector, ignition switch output circuit (Yellow wire). While observing scan tool, hold ignition switch in RUN position. If voltage is less than 10 volts, repair open Yellow 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 Park position and parking brake is set. Briefly connect a jumper wire between starter relay connector, fused battery circuit (Black wire on AB and AN bodies; Pink/Black wire on BR body) and starter relay output circuit (Brown wire). If starter cranks, go to next step. if starter does not crank, go to step 6).
  5. Using scan tool in ohmmeter mode, check resistance of starter relay connector, P/N sense circuit (Brown/Orange wire on AB and BR bodies; Black/White wire on BR body). If resistance is less than 5 ohms, replace starter relay. Perform TEST VER-1. If resistance is more than 5 ohms, repair open Brown/Orange wire, Black/Orange wire or Black/White wire. Perform TEST VER-1.
  6. Note if solenoid clicked when jumper wire was connected. Disconnect jumper wire. Disconnect starter solenoid connector (Brown wire) from starter solenoid. Using an external ohmmeter, check resistance of Brown wire between starter relay output connector and starter solenoid connector. If resistance is more than 5 ohms, repair open Brown wire. Perform TEST VER-1.
  7. If resistance is less than 5 ohms, install starter relay. Check battery cables for high resistance. If either battery circuit had a voltage drop of more than .2 volt, repair battery circuit for high resistance. Perform TEST VER-1. If voltage drop for either battery circuit is less than .2 volt, go to next step.
  8. If starter solenoid clicked when jumper wire was connected in step 6), repair starter for a mechanical failure. Perform TEST VER-1. If starter solenoid did not click, replace starter solenoid. Perform TEST VER-1.

TEST VER-1 - NO START VERIFICATION

  1. Check vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. Check engine oil for fuel contamination. If engine oil is contaminated, change oil and filter. Attempt to start engine. If engine does not start, check all related Tech Service Bulletins (TSBs), perform corrective action as necessary, and go to TEST TC-1A.
  2. If engine starts and Powertrain Control Module (PCM) has been replaced, repair is complete. If engine starts and PCM has not been replaced, connect scan tool to data link connector and erase DTCs. Repair is complete.

TEST VER-2 - ROAD TEST VERIFICATION

  1. Check vehicle to ensure all engine components are connected. Reassemble and reconnect components as necessary. If more than one DTC is present and have not been diagnosed, go to TEST TC-1A and diagnose other DTCs. If Powertrain Control Module (PCM) has not been replaced, connect scan tool to data link connector and erase DTCs.
  2. Using scan tool, reset all values in adaptive memory. Disconnect scan tool. To ensure no other DTCs are present, turn on A/C and blower (if equipped) and drive vehicle at least 5 minutes (attaining a speed of 40 MPH). Ensure transmission shifts through all gears. When road test is complete, turn ignition off.
  3. Start engine and operate at idle for 2 minutes. Turn engine off. Using scan tool, read DTCs. Using scan tool, read DTCs. If previously repaired DTCs reset, repair is not complete. Check all related Tech Service Bulletins (TSBs), perform corrective action as necessary, and go to TEST TC-1A as necessary. If a new DTC message is present, go to TEST TC-1A and diagnose other DTCs. If no DTCs are present, repair is complete.

SUMMARY

If no hard DTCs (or only pass codes) are present, driveability symptoms exist or intermittent codes exist, proceed to TEST NTC-1A for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.) or INTERMITTENTS in CHRYSLER CORP. TROUBLE SHOOTING - NO CODES - 5.2L CNG article.

Wiring Diagram (Ram Van/Wagon - 5.2L CNG - 1 Of 2). Scheme 96

Scheme 96: Wiring Diagram (Ram Van/Wagon - 5.2L CNG - 1 Of 2)
Scheme 96: Wiring Diagram (Ram Van/Wagon - 5.2L CNG - 1 Of 2)

Wiring Diagram (Ram Van/Wagon - 5.2L CNG - 2 Of 2). Scheme 97

Scheme 97: Wiring Diagram (Ram Van/Wagon - 5.2L CNG - 2 Of 2)
Scheme 97: Wiring Diagram (Ram Van/Wagon - 5.2L CNG - 2 Of 2)

See also:
• CHRYSLER CORP. - BASIC DIAGNOSTIC PROCEDURES - 5.2L CNG
• CHRYSLER CORP. TROUBLE SHOOTING - NO CODES - 5.2L CNG
• COMPUTER RELEARN PROCEDURES
• CHRYSLER CORP. - GENERATORS & REGULATORS
• CHRYSLER CORP. CRUISE CONTROL SYSTEMS
• DTCS/MESSAGES
• CLEARING DTCS
• FUEL PRESSURE RELEASE
• VISUAL INSPECTION
• ENTERING ON-BOARD DIAGNOSTICS
• TEST NS-1A
• TEST TC-1A
• TEST NTC-1A
• CONNECTOR IDENTIFICATION
• WIRING DIAGRAMS
• TC-2A
• TC-3A
• TC-4A
• TC-5A
• TC-6A
• TC-7A
• TC-8A
• TC-9A
• TC-10A
• TC-11A
• TC-12A
• TC-13A
• TC-14A
• TC-15A
• TC-16A
• TC-17A
• TC-18A
• TC-19A
• TC-20A
• TC-21A
• TC-22A
• TC-23A
• TC-24A
• TC-25A
• TC-26A
• TC-27A
• TC-28A
• TC-29A
• TC-30A
• TC-31A
• TC-32A
• TC-33A
• TC-34A
• TC-35A
• TC-36A
• TC-37A
• INACTIVE DTC CONDITION
• 23B
• 23C
• 23D
• 23E
• TEST TC-34B
• TC-37B
• TC-38A
• TC-39A
• TC-40A
• TC-41A
• TC-42A
• TC-43A
• TC-44A
• NTC-2A
• NTC-3A
• NTC-4A
• NTC-5A
• NTC-6A
• NTC-7A
• NTC-8A
• NTC-9A
• NTC-10A
• NTC-11A
• NTC-12A
• NTC-13A
• NTC-14A
• NTC-15A
• NTC-16A

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