Engine Controls - Basic Diagnostic Procedures - Gasoline: Diagnosis Dodge Cab & Chassis R3500

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.

Visually inspect all electrical wiring, looking for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Ensure vacuum hoses are properly routed and are not cracked, pinched or cut. See VACUUM DIAGRAMS article. Inspect air induction system for possible vacuum leaks.

MECHANICAL INSPECTION

Check engine mechanical condition with a compression gauge, vacuum gauge or scan tool. See scan tool manual for specific instructions.

FUEL PRESSURE LEAKDOWN TEST

Note. Perform FUEL PUMP PRESSURE TEST before performing FUEL PRESSURE LEAKDOWN TEST. Perform FUEL PUMP VOLUME TEST in conjunction with FUEL PUMP PRESSURE TEST. After each repair procedure has been completed, reconnect all components. Perform TEST VER-1: POWERTRAIN VERIFICATION under VERIFICATION TESTS to ensure system is functioning properly.

1. Release fuel system pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-99022-S36246382032001061300000) . Remove air cleaner housing (if necessary) to access quick-connect fuel fittings. Disconnect fuel supply line quick-connect fittings at fuel rail. Connect Fuel Line Pressure Test Adapter (6539 ) for 5/16" fuel lines, or Fuel Line Pressure Test Adapter (6631 ) for 3/8" fuel lines, and test port "T" between disconnected fuel supply line and fuel rail.
2. Connect 0-60 psi fuel pressure test gauge to test port "T" on appropriate Fuel Line Pressure Test Adapter. Start engine and bring to normal operating temperature. Observe fuel pressure test gauge. Fuel system pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm 2 ). Shut engine off. Fuel system pressure should not fall to less than 30 psi (2.1 kg/cm 2 ) for 5 minutes. Go to next step.
3. If fuel system pressure falls to less than 30 psi (2.1 kg/cm 2 ), check fuel injector, check valve inside fuel pump module or fuel tube/line for leaks. To diagnose components and pinpoint fuel system leaks, perform the following tests: Fuel Injector Or Fuel Rail Leakage Start engine and operate at idle for 2 minutes. Shut off engine. Clamp off rubber hose portion of Fuel Line Pressure Test Adapter between fuel rail and test port "T" on Fuel Line Pressure Test Adapter. If fuel system pressure does not fall to less than 30 psi (2.1 kg/cm 2 ) for 5 minutes, fuel injector or fuel rail is leaking. Repair as necessary. Fuel Pump Check Valve, Filter/Regulator Check Valve Or Fuel Tube/Line Leakage Start engine and operate at idle for 2 minutes. Shut off engine. Clamp off rubber hose portion of Fuel Line Pressure Test Adapter between vehicle fuel line and test port "T" on Fuel Line Pressure Test Adapter. If fuel system pressure does not fall to less than 30 psi (2.1 kg/cm 2 ) for 5 minutes, fuel rail and fuel injectors are not leaking. Check fuel lines and tubes for leakage. If fuel lines and tubes are okay, check electric fuel pump or filter/regulator check valves for leakage. A quick loss of fuel system pressure usually indicates defective check valve in the filter/regulator. A slow loss of pressure usually indicates a defective check valve in the electric fuel pump. Repair as necessary.

FUEL PUMP AMPERAGE TEST

Note. Perform FUEL PUMP VOLUME TEST , FUEL PUMP PRESSURE TEST and FUEL PRESSURE LEAKDOWN TEST before performing FUEL PUMP AMPERAGE TEST. After each repair procedure has been completed, reconnect all components. Perform TEST VER-1: POWERTRAIN VERIFICATION under VERIFICATION TESTS to ensure system is functioning properly.

Scheme 118

Scheme 119

Scheme 120

1. Ensure fuel tank temperature is more than 50°F (10°C). Connect Low Current Shunt (LCS) adapter into DRB-III(R) scan tool SET 1 connector. (Scheme 118) Connect DRB-III(R) scan tool to Data Link Connector (DLC). Connect test lead cables into 10-amp (10A +) and common (-) connectors on LCS. Access MAIN MENU on scan tool. Press DVOM button.
2. Use left/right arrow keys to highlight CHANNEL 1 function on scan tool. Press ENTER 3 times. Use up/down arrow keys to high light RANGE on scan tool. Press ENTER to change from 2-amp scale to 10-amp scale. Depending on model of vehicle, 2 different relays are used. Use the following procedure for appropriate model and relay: Ram Pickup Fuel Pump Relay Remove fuel pump relay from Power Distribution Center (PDC). see scheme 1 PDC is located in right side of engine compartment, next to battery. Attach test leads from LCS adapter into PDC relay cavities No. 30 and 87. (Scheme 119) Ram Van/Ram Wagon Fuel Pump Relay Remove fuel pump relay from fuse block. Fuse block is located behind left kick panel. see scheme 3 Attach test leads from LCS adapter into PDC relay cavities No. 3 and 5. (Scheme 120) Fuel pump will be operated when LCS adapter leads are connected to relay cavities. Read fuel pump amperage from DRB-III(R) scan tool screen. Amperage should be less than 10 amps. If amperage is 10 amps or more, replace fuel pump module assembly. If amperage is less than 10 amps and FUEL PUMP PRESSURE, FUEL PUMP CAPACITY and FUEL PRESSURE LEAK DOWN test readings are okay, fuel pump module is okay.

FUEL PUMP PRESSURE TEST

Note. After each repair procedure has been completed, reconnect all components. Perform TEST VER-1: POWERTRAIN VERIFICATION under VERIFICATION TESTS to ensure system is functioning properly.

FUEL PUMP VOLUME TEST

Note. Perform FUEL PUMP PRESSURE TEST before performing FUEL PUMP VOLUME TEST. Perform FUEL PRESSURE LEAKDOWN TEST in conjunction with FUEL PUMP VOLUME TEST. See FUEL PRESSURE LEAKDOWN TEST . After each repair procedure has been completed, reconnect all components. Perform TEST VER-1: POWERTRAIN VERIFICATION under VERIFICATION TESTS to ensure system is functioning properly.

1. Release fuel system pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-99022-S36246382032001061300000) . Remove air cleaner housing (if necessary) to access quick-connect fuel fittings. Disconnect fuel supply line quick-connect fittings at fuel rail. Connect Fuel Line Pressure Test Adapter (6539 ) for 5/16" fuel lines, or Fuel Line Pressure Test Adapter (6631 ) for 3/8" fuel lines, to the disconnected fuel supply line.
2. Insert other end of fuel line pressure test adapter into a graduated container. Remove fuel filler cap. Using DRB-III(R) scan tool, actuate fuel pump relay. This should activate fuel pump and pressurize system. Fuel pump should deliver at least .5 pt. (.25 L) of fuel in 7 seconds. If volume is lower than specification, but fuel pump can be heard through fuel filler, check for a kinked or damaged fuel supply line between fuel rail and fuel pump module. Go to next step.
3. If fuel supply line is not kinked or damaged and fuel pressure is okay, but capacity is low, replace fuel filter/fuel pressure regulator. Fuel pressure regulator can be replaced separately on some models. If both fuel volume and pressure are low, replace fuel pump module assembly. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article.

Testing

1. The following checks must be performed before continuing with this test: Ensure battery is fully charged and in good condition. If battery charge is low, charge battery and crank engine for 15 seconds, 3 consecutive times. This will allow any Diagnostic Trouble Codes (DTC) that may have been erased due to low battery charge, to set in memory. Ensure Powertrain Control Module (PCM) power and ground circuits are okay. See COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article. Ensure PCM communicates with scan tool and no Diagnostic Trouble Codes (DTC) are present. See RETRIEVING DIAGNOSTIC TROUBLE CODES under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article. Ensure CCD bus is functional. Using scan tool, attempt to communicate with instrument cluster and Central Timer Module (CTM). If scan tool does not communicate with instrument cluster or CTM, diagnose communication failure. See COMMUNICATIONS under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If no DTCs are present, use scan tool and select CLEAR PCM (BATT DISCONNECT). Crank engine over several times. Using scan tool, check for DTCs. If any DTCs are present, perform appropriate diagnostic test. See appropriate SELF-DIAGNOSTICS article. If DTCs are still not present, go to next step.
2. Turn ignition on. Using scan tool under DTCs & RELATED FUNCTIONS menu, monitor SECONDARY INDICATORS while cranking engine. If no SECONDARY INDICATORS exist, go to next step. If any SECONDARY INDICATORS exist, perform appropriate symptom test related to indicator. See appropriate TROUBLE SHOOTING - NO CODES article.
3. Turn ignition off. Check Power Distribution Center (PDC) and junction block for blown fuses. PDC is located on left side of engine compartment. see scheme 1or see scheme 2. Junction block is located behind left kick panel. Replace blown fuses and check related circuits for short to ground. If fuses are okay, go to next step.
4. Using scan tool in SENSOR mode, monitor CURRENT CKP COUNT while cranking engine. If CKP count changes while cranking engine, go to next step. If CKP count does not change while cranking engine, go to DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.
5. Using scan tool in SENSOR mode, monitor CURRENT CMP COUNT while cranking engine. If CMP count changes while cranking engine, go to next step. If CMP count does not change while cranking engine, go to DTC P0340: NO CAM SIGNAL AT PCM under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article.
6. Ensure ignition is on. Using scan tool in INPUTS/OUTPUTS mode, read CURRENT SYNC STATE while cranking engine. If scan tool does not display OUT OF SYNC, go to next step. If scan tool displays OUT OF SYNC, check CKP sensor signal circuit for short to CMP sensor signal circuit. See WIRING DIAGRAMS article. Repair wiring as necessary. If wiring is okay, check for incorrect valve timing or for CMP sensor drive problem. Repair valve timing or CMP sensor drive as necessary. See appropriate article in ENGINES.
7. Use spark tester to check spark at spark plug. If using spark tester, ensure spark tester is properly grounded to prevent damage to ignition coil. Crank engine for 10 seconds and check for spark. Consider 1-2 sparks as a no spark condition. If good spark does not exist, reconnect spark plug wire and go to next step. If good spark exists, reconnect spark plug wire and go to step 13.
8. Ensure ignition is off. Remove ignition coil wire from distributor cap. Connect ignition coil wire to spark tester. Ensure tester is properly grounded. Crank engine for 10 seconds and check for spark. Consider 1-2 sparks as a no spark condition. If good spark does not exist, remove tester and go to next step. If good spark exists, replace distributor cap, rotor or spark plug wires that caused the loss of spark.
9. Ensure ignition is off. Disconnect ignition coil connector. Using ohmmeter, check ignition coil primary resistance between both electrical terminals on ignition coil. Ignition coil primary resistance should be within specification. See «IGNITION COIL RESISTANCE»(ref-99022-S13455002952001061900000) table. If ignition coil primary resistance is within specification, go to next step. If ignition coil primary resistance is not within specification, replace ignition coil.
10. Check ignition coil secondary resistance. Using ohmmeter, measure between ignition coil driver circuit terminal at ignition coil and ignition coil output tower. Refer to appropriate wire color for suspect coil in «COIL DRIVER CIRCUIT IDENTIFICATION»(ref-99022-S28810561012001060600000) table. For resistance specifications, see «IGNITION COIL RESISTANCE»(ref-99022-S13455002952001061900000) table. If ignition coil secondary resistance is within specification, go to next step. If ignition coil secondary resistance is not within specification, replace ignition coil. COIL DRIVER CIRCUIT IDENTIFICATION (1) Coil Driver No. PCM Connector/Terminal No. (Wire Color) 1 C1/7 (2) 2 C1/9 (Dark Blue/White) 3 C1/3 (Red/Black) 4 C1/1 (Yellow/Gray) 5 C1/5 (Dark Green/Gray) (1) For PCM harness connector terminal identification see scheme 7 (2) Models with 3.9L, 5.2L and 5.9L use coil driver No. 1 only. Gray wire on Ram Van and Wagon, or Black/Gray wire on Ram Pickup. Models with 8.0L use Black/Gray wire for coil driver No. 1.
11. Ensure ignition coil connector is still disconnected. Using 12-volt test light connected to positive battery voltage, probe appropriate ignition coil harness connector coil driver circuit terminal while cranking engine. See «COIL DRIVER CIRCUIT IDENTIFICATION»(ref-99022-S28810561012001060600000) table. If test light flashes on and off while cranking engine, go to next step. If test light does not flash on and off while cranking engine, check for open or short in appropriate coil driver circuit between ignition coil and PCM. PCM is located at passenger's side front corner of engine compartment on inner fender panel. If open or short exists in coil driver circuit, repair wiring as necessary. If open or short does not exist in coil driver circuit, replace PCM.
12. Ensure ignition coil connector is still disconnected. Turn ignition on with engine off. Using scan tool, actuate ASD relay. Using a 12-volt test light connected to ground, probe ignition coil harness connector power circuit terminal (Dark Green/Orange wire). If test light illuminates brightly, stop actuation of ASD relay and go to next step. If test light does not illuminate brightly, stop actuation of ASD relay. Check for open or high resistance in Dark Green/Orange wire between ASD relay and ignition coil. ASD relay is located in PDC. PDC is located on left side of engine compartment. see scheme 1or see scheme 2. If wiring is okay, check ASD relay power supply fuses and/or check ASD relay. See AUTO SHUTDOWN RELAY under MOTORS, RELAYS & SOLENOIDS in appropriate SYSTEM & COMPONENT TESTING article.
13. Using scan tool, actuate fuel pump relay. Using a mechanic's stethoscope, listen for fuel pump operation at fuel tank. If fuel pump operation cannot be heard, stop ASD fuel system actuation and go to step 20. If fuel pump operation can be heard, stop ASD fuel system actuation and go to next step.
14. Check the following conditions and/or mechanical components: Ensure engine valve timing is within specification. Ensure engine compression is within specification. See «COMPRESSION SPECIFICATIONS»(ref-99022-S04719180882001061900000) table. Ensure engine exhaust system is free of restrictions and/or leaks. Ensure fuel is free of contamination. Ensure fuel injectors are not plugged or restricted, and injector driver circuit wires are connected to proper fuel injectors. Repair as necessary. If no faults are found, go to next step.
15. Turn ignition off. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-99022-S36246382032001061300000). Remove test port cap. Install a 0-60 psi (0-4.2 kg/cm 2 ) fuel pressure gauge at test port. Turn ignition on, with engine off. Using scan tool, actuate fuel pump relay. Allow fuel pressure gauge to stabilize. Stop ASD fuel system activation. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm 2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is more than specified, replace fuel filter/pressure regulator. If fuel pressure is as specified, go to step 19.
16. Raise and support vehicle. Check for signs of damage in fuel supply line from fuel pump module to fuel rail that may restrict supply line. Repair or replace fuel supply line as necessary. If fuel supply line is okay, go to next step.
17. Ensure fuel pressure is released. Remove fuel pump module and inspect fuel inlet strainer. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article. If fuel inlet strainer is plugged, replace fuel pump inlet strainer. If fuel inlet strainer is not plugged, go to next step.
18. At this time, fuel pump module is assumed to be defective. Replace fuel pump module.
19. Check fuel pump volume. Perform «FUEL PUMP VOLUME TEST»(ref-99022-S35176149742001061300000) under FUEL SYSTEM. If fuel pump volume is within specification, check for fuel contamination. If fuel is not contaminated, test is complete. If fuel pump volume is not within specification, check for a kinked or damaged fuel supply line between fuel pump module and fuel rail. Repair fuel supply line as necessary. If fuel supply line is okay, replace fuel pump module. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article.
20. Turn ignition off. Disconnect fuel pump module connector. Using DVOM, measure resistance between ground and fuel pump module harness connector terminal No. 1 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between fuel pump module and ground point. See WIRING DIAGRAMS article.
21. Ensure ignition is off. Ensure fuel pump module is disconnected. On Ram Pickup, remove fuel pump relay from Power Distribution Center (PDC). see scheme 1 PDC is located in right side of engine compartment, next to battery. On Ram Van/Ram Wagon, remove fuel pump relay from fuse block. Fuse block is located behind left kick panel. see scheme 3 On all models, check for battery voltage between fuel pump relay cavity No. 30 (Ram Pickup), or cavity No. 5 (Ram Van/Ram Wagon). See «FUEL PUMP RELAY TERMINAL IDENTIFICATION»(ref-99022-S34549758922001061900000) table. If battery voltage is present, go to next step. If battery voltage is not present, check for open in appropriate wire between fuel pump relay and 20-amp fuel pump relay fuse No. 3 (Ram Pickup), or No. 17/18 (Ram Van/Ram Wagon). See POWER DISTRIBUTION article in WIRING DIAGRAMS. If wiring is okay, check for blown fuel pump relay fuse. FUEL PUMP RELAY TERMINAL IDENTIFICATION Application & Terminal No. Wire Color Ram Van & Ram Wagon 1 Light Green/Black 2 Dark Green/White 3 Brown 5 Dark Green/Black Ram Pickup 30 Red/White 85 Brown/White 86 Light Green/Black 87 Dark Green/Black
22. Ensure ignition is off. Ensure fuel pump relay is removed. Measure resistance of specified wire between fuel pump module harness connector terminal No. 1 and fuel pump relay cavity No. 87 (Ram Pickup), or cavity No. 2 (Ram Van/Ram Wagon). See «FUEL PUMP RELAY TERMINAL IDENTIFICATION»(ref-99022-S34549758922001061900000). see scheme 1or see scheme 2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in appropriate wire between fuel pump module and fuel pump relay.
23. Ensure fuel pump relay is removed from PDC. Using DRB-III(R) scan tool, actuate fuel pump relay. Using a 12-volt test light connected to positive battery voltage, probe fuel pump relay cavity No. 85 (Ram Pickup), or cavity No. 3 (Ram Van/Ram Wagon). If test light illuminates brightly, circuit is okay. Replace fuel pump relay. If test light does not illuminate brightly, stop actuation of fuel pump relay. Check for open in appropriate wire between fuel pump relay and PCM. See WIRING DIAGRAMS article. If wiring is okay, replace PCM.

1. Turn ignition off. Attempt to rotate engine crankshaft by hand to ensure engine is not seized. If crankshaft is able to rotate, go to next step. If crankshaft is unable to rotate, repair engine mechanical fault. See appropriate article in ENGINES.
2. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) connectors. Using DVOM, measure resistance between ground and PCM harness connector C1 terminal A6 (Black/White wire on Ram Pickup, or Brown/Yellow wire on Ram Van/Ram Wagon). see scheme 7 Move gearshift lever through all positions, starting in "P" position and going to "1" position. Resistance should decrease smoothly from more than 10 ohms to less than 10 ohms while moving gearshift lever through all positions. If resistance changes as specified, go to next step. If resistance does not change as specified, replace TR sensor.
3. Ensure ignition is off. Check battery cables for excessive resistance by checking voltage drop on each battery cable. If voltage drop on battery cables is.2 volt or less, go to next step. If voltage drop on any battery cable is more than.2 volt, repair battery cable for excessive resistance.
4. Ensure parking brake is applied. On models equipped with an automatic transmission, ensure transmission is in Park. On all models, remove starter relay from Power Distribution Center (PDC). PDC is located on left side of engine compartment. see scheme 1or see scheme 2. Note cavities for starter relay in PDC. Momentarily connect jumper wire between starter relay cavities No. 30 and 87 (Ram Pickup), or cavities No. 3 and 5 (Ram Van/Ram Wagon). If starter does not operate and engine does not crank over, go to step 7. If starter operates and engine cranks over, go to next step.
5. Using a 12-volt test light, check for voltage between ground and starter relay cavity No. 86 (Ram Pickup), or No. 1 (Ram Van/Ram Wagon) in PDC with ignition switch in START position. see scheme 1or see scheme 2. This is the fused ignition switch output circuit. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance in Yellow/Red wire (Ram Pickup) or Yellow wire (Ram Van/Ram Wagon) between ignition switch and starter relay. If wiring is okay, check for blown fuse No. 10 (Ram Pickup), or No. 3 (Ram Van/Ram Wagon) in PDC. Repair as necessary.
6. Turn ignition off. Ensure starter relay is removed from PDC. Disconnect Powertrain Control Module (PCM). Using DVOM, measure resistance of Black/White wire (Ram Pickup), or Brown/Yellow wire (Ram Van/Ram Wagon) between starter relay cavity No. 85 (Ram Pickup), or cavity No. 2 (Ram Van/Ram Wagon) and PCM harness connector C1 terminal A6. see scheme 1, see scheme 2 and see scheme 7. If resistance is less than 5 ohms, replace starter relay. If resistance is 5 ohms or more, repair open in Black/White or Brown/Yellow wire between starter relay in PDC and PCM.
7. Ensure ignition is off and starter relay is removed from PDC. Disconnect starter relay output connector from starter solenoid. Using DVOM, measure resistance of Brown wire between starter relay cavity No. 87 (Ram Pickup), or No. 5 (Ram Van/Ram Wagon) and starter solenoid harness connector. This is the starter relay output circuit. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Brown wire between starter relay and starter solenoid.
8. Ensure starter relay is removed from PDC. Using a 12-volt test light connected to ground, probe starter relay cavity No. 30 (Ram Pickup), or No. 3 (Ram Van/Ram Wagon) in PDC. see scheme 1or see scheme 2. This is the fused Battery (+) circuit to starter relay. If test light illuminates brightly, replace starter motor. If test light does not illuminate brightly, check for open in Yellow wire (Ram Pickup) or Black/Pink wire (Ram Van/Ram Wagon) between cavity No. 30 in PDC. If wiring is okay, check for blown fuse No. 9 (Ram Pickup), or No. 5 (Ram Van/Ram Wagon) in PDC. Repair as necessary.

Note. Ensure ignition was on and DRB-III(R) scan tool in proper working order prior to attempting communication with PCM.

1. Turn ignition off. Disconnect PCM connectors. PCM is located at passenger's side front corner of engine compartment on inner fender panel. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors necessary. Using a 12-volt test light connected to ground, probe PCM harness connector C1 terminal A22 (Red/White wire on Ram Pickup, or Dark Green/Black wire on Ram Van/Ram Wagon). see scheme 7 If test light illuminates brightly, go to next step. If test light does not illuminate brightly, check for open in Red/White or Dark Green/Black wire between Power Distribution Center (PDC) and PCM. If wiring is okay, check for blown fuse No. 3 (Ram Pickup), or No. 17/18 (Ram Van/Ram Wagon) in PDC. PDC is located on left side of engine compartment. see scheme 1or see scheme 2.
2. Turn ignition on. Using a 12-volt test light connected to ground, probe PCM harness connector C1 terminal A2 (Light Green/Black wire). see scheme 7 If test light illuminates brightly, power circuits are okay. Go to next step. If test light does not illuminate brightly, repair open in Light Green/Black wire between PCM and junction block (Ram Pickup), or fuse block (Ram Van/Ram Wagon). If wiring is okay, check for blown junction block fuse No. 9 (Ram Pickup), or blown fuse block fuse No. 6 (Ram Van/Ram Wagon). Junction block and fuse block are located behind left kick panel.
3. Turn ignition off. Using 12-volt test light connected to positive battery voltage, probe PCM harness connector C1 terminals A31 and A32 (Black/Tan wires). see scheme 7 If test light illuminates brightly at both terminals, go to next step. If test light does not illuminate brightly at one or both terminals, repair open in appropriate Black/Tan wire between PCM and ground point. On Ram Pickup, ground point is located on front of engine. On Ram Van/Ram Wagon, ground point is located at rear of left cylinder head.
4. At this time, PCM is assumed to be defective. Replace PCM.

1. Turn ignition on. Using scan tool, check for Diagnostic Trouble Codes (DTC). If no DTCs are present, go to next step. If any DTCs are present, perform appropriate diagnostic test. See appropriate SELF-DIAGNOSTICS article.
2. Using scan tool, check for Central Timer Module (CTM) DTCs. If no CTM DTCs are present, go to next step. If any CTM DTCs are present, see DIAGNOSTIC TROUBLE CODE IDENTIFICATION table under SELF-DIAGNOSTIC SYSTEM in appropriate BODY CONTROL MODULES article.
3. Turn ignition off. Release fuel pressure. See «FUEL SYSTEM PRESSURE RELEASE»(ref-99022-S36246382032001061300000) . Remove fuel rail test port cap. Install a 0-60 psi (0-4.2 kg/cm 2 ) fuel pressure gauge at test port. Turn ignition on. Using scan tool, actuate fuel pump relay. This should activate fuel pump and pressurize system. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm 2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is as specified, go to step 7 . If fuel pressure is more than specified, replace fuel filter/pressure regulator. See FUEL FILTER/FUEL PRESSURE REGULATOR under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article.
4. Turn ignition off. Release fuel pressure if necessary. Disconnect fuel supply line from fuel rail. Install Fuel Line Pressure Test Adapter Hose (6539 for 5/16" fuel lines or 6631 for 3/8" fuel lines) to disconnected fuel line. Insert other end of fuel line pressure test adapter into a graduated container. Turn ignition on. Using scan tool, actuate fuel pump relay. This should activate fuel pump and pressurize system. Fuel pump should deliver at least .5 pt. (.25 L) of fuel in 7 seconds. If fuel pump volume is within specification, go to next step. If fuel pump volume is not within specification, repair kinked or damaged fuel supply line between fuel pump module and fuel rail.
5. Turn ignition off. Raise and support vehicle. Disconnect fuel supply line at fuel pump module. Connect fuel line pressure test adapter and test port "T" between disconnected fuel supply line and fuel pump module. Install a 0-60 psi (0-4.2 kg/cm 2 ) fuel pressure gauge at "T". Turn ignition on. Using scan tool, actuate fuel pump relay. Monitor fuel pressure at fuel pressure gauge. Fuel pressure should be 44.2-54.2 psi (3.1-3.8 kg/cm 2 ). If fuel pressure is less than specified, go to next step. If fuel pressure is as specified, repair kinked or damaged fuel supply line between fuel pump module and fuel rail.
6. With vehicle raised and supported, remove fuel pump module and inspect fuel inlet strainer. See FUEL PUMP MODULE under FUEL SYSTEMS in appropriate REMOVAL, OVERHAUL & INSTALLATION article. If fuel inlet strainer is plugged, replace fuel pump inlet strainer. If fuel inlet strainer is not plugged, replace fuel pump module. Test is complete.
7. Turn ignition on. Using scan tool, monitor TPS VOLTS while slowly depressing throttle pedal from idle position to wide open throttle position. If voltage changes smoothly, go to next step. If voltage does not change smoothly, replace TP sensor.
8. Ensure throttle is fully closed and against throttle stop. Using scan tool, read TPS VOLTS. If voltage is 0.92 volt or less, go to next step. If voltage is more than 0.92 volt, check for binding throttle linkage. Repair linkage as necessary. If linkage is not binding and throttle is fully closed, replace TP sensor.
9. Turn ignition on. Using scan tool, read Engine Coolant Temperature (ECT) sensor value. If engine coolant temperature is more than 180°F (82°C), allow engine coolant temperature to cool down to 150°F (66°C) before proceeding. If engine coolant temperature is 150°F (66°C) or less, start engine and monitor scan tool until engine coolant temperature reaches 180°F (82°C). If ECT sensor value increases smoothly, go to next step. If ECT sensor value does not increase smoothly, replace ECT sensor.
10. Check the following additional items as possible causes for start and stall condition: Check for any technical service bulletins that may apply. Fuel must be free of contamination. Engine exhaust system must be free of restrictions. Engine compression must be within specification. Engine valve timing must be within specification. Engine must be free of vacuum leaks. Throttle body must be free of carbon build-up and dirt. Repair any problems as necessary. If no problems exist, test is complete.

TEST VER-1: POWERTRAIN VERIFICATION

Note. If Powertrain Control Module (PCM) is replaced, the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into the PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Controller Anti-Lock Brake (CAB) module and Air Bag Control Module (ACM). To program PCM and clear DTCs from CAB and ACM modules, perform PROGRAMMING POWERTRAIN CONTROL MODULE procedure under POWERTRAIN CONTROL MODULE under PROGRAMMING.

Inspect vehicle to ensure all components related to repair are properly connected. Reassemble and reconnect components as necessary. Inspect engine oil for fuel contamination. Change engine oil and filter as necessary. Attempt to start engine. If engine starts and stays running, test is complete. If engine does not start, or starts and stalls, check for related technical service bulletins and return to NO-START DIAGNOSIS for additional testing.

TEST VER-5: OBD-II MONITOR VERIFICATION

Note. If Powertrain Control Module (PCM) is replaced, the correct vehicle mileage and Vehicle Identification Number (VIN) must be programmed into the PCM to prevent Diagnostic Trouble Codes (DTC) from being stored in Controller Anti-Lock Brake (CAB) module and Air Bag Control Module (ACM). To program PCM and clear DTCs from CAB and ACM modules, perform PROGRAMMING POWERTRAIN CONTROL MODULE procedure under POWERTRAIN CONTROL MODULE under PROGRAMMING.

1. Inspect vehicle to ensure all components related to the repair are properly connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, perform appropriate DTC test and finish diagnosing remaining DTCs as necessary. If all DTCs have been diagnosed and repaired, ensure fuel tank is at least 1/4 full and all accessories are off. If repair procedure did not include replacing PCM, go to next step. If repair procedure did include replacing PCM, use scan tool to ensure correct VIN and mileage has been programmed into PCM. Go to next step.
2. If a DTC for OBD-II monitor was repaired, go to next step. If a DTC for a comprehensive component was repaired, turn ignition off for at least 10 seconds. Start engine and operate engine for at least 2 minutes while noting GOOD TRIP counter. If GOOD TRIP counter changes to one or more and no new DTCs exist, repair was complete. If GOOD TRIP counter changes to zero or repaired DTC or new DTC is stored, repair is not complete. Check for related technical service bulletins or flash updates and then proceed to appropriate DTC test.
3. Proper way to ensure DTC is properly repaired is to allow PCM to run appropriate OBD-II monitor. OBD-II monitor operation may be observed on the scan tool. In order for OBD-II monitor to be run, certain pretest enabling conditions must be met. Refer to applicable OBD-II monitor pretest screen on scan tool for monitor enabling conditions. Operate vehicle within all enabling conditions and allow applicable OBD-II monitor to run.
4. While OBD-II monitor is running, scan tool will beep. After OBD-II monitor is complete, view the results. If OBD-II monitor ran and GOOD TRIP counter changed to one or more, repair is complete. If OBD-II monitor failed, repaired DTC or any other DTC is stored, repair is not complete. Check for related technical service bulletins or flash updates and then proceed to appropriate DTC test. If catalyst was replaced, use scan tool, select MISCELLANEOUS, then CATALYST REPLACED and then press ENTER.