Driveability - Non-Dtc Based Diagnostics - Gasoline: Other RAM Pickup 2500

CHECKING THE FUEL DELIVERY SYSTEM

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Possible Causes

Scheme 646

1. FUEL PUMP OPERATION Ignition on, engine not running. With a scan tool, actuate the Fuel System test. NOTE: It may be necessary to use a mechanics stethoscope in the next step. Listen for fuel pump operation at the fuel tank. Does the Fuel Pump operate? Yes Go To 2 . No Go To 5 . CAUTION: Stop All Actuations.
2. FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Install Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) at the engine. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). Choose a conclusion that best matches your fuel pressure reading. Below Specification Go To 3 . Within Specification Test Complete. Above Specification Replace the fuel filter/fuel pressure regulator. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . CAUTION: Stop All Actuations.
3. RESTRICTED FUEL SUPPLY LINE WARNING: The fuel system is under a constant pressure even with the engine off. Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Turn the ignition off. Disconnect the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel). Raise the ehicle on a hoist, and disconnect the fuel pressure line at the fuel pump module. Install the Fuel Pressure Decay Tester (special tool #8978A, Decay Tool, Fuel) between the fuel supply line and the fuel pump module. Ignition on, engine not running. With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge. NOTE: Fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). Is the fuel pressure within specification now? Yes Repair/replace fuel supply line as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Go To 4 . CAUTION: Stop All Actuations.
4. CHECKING FUEL INLET STRAINER WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Turn the ignition off. Remove the Fuel Pump Module and inspect the Fuel Inlet Strainer. Is the Fuel Inlet Strainer plugged? Yes Replace the Fuel Pump Inlet Strainer. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Replace the Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
5. (N1) FUEL PUMP RELAY OUTPUT CIRCUIT Turn the ignition off. Disconnect the TIPM C6 harness connector. Disconnect the Fuel Pump Module harness connector. Using a 12-volt test light connected to ground, probe the (N1) Fuel Pump Control Output circuit at the Fuel Pump harness connector. NOTE: Make sure the test light is probing the circuit before actuating the Fuel Pump or a DTC may set and not allow the actuation. With a scan tool, actuate the Fuel Pump Module. Does the test light illuminate brightly during the actuation? Yes Replace the Fuel Pump Module. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Repair the open or short to ground in the (N1 Fuel Pump Control Output circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .

CHECKING THE PCM POWER AND GROUND CIRCUITS

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

Scheme 647

Scheme 648

Scheme 649

1. PCM WIRING OR CONNECTORS Turn the ignition off. Using the wiring diagram/schematic as a guide, inspect the wiring and each connector at the PCM. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Were any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Go To 2 .
2. CHECKING THE PCM GROUND CIRCUITS Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12 volt test light connected to 12 volts, check the PCM ground circuits. Wiggle test each circuit during the test to check for an intermittent open in the circuit. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To. Refer to 3 . No Repair the PCM ground circuit(s) for an open circuit or high resistance. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
3. CHECKING THE PCM FUSED IGNITION CIRCUITS CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Turn the ignition on. Using a 12 volt test light connected to ground, check the PCM Fused Ignition circuits. Check each circuit with the ignition on, engine running position, and during cranking. Wiggle test each circuit during the test to check for an intermittent open in the circuit. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To. Refer to 4 . No Repair the open or short to ground in the PCM Fused Ignition circuits. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
4. CHECKING THE PCM FUSED B+ CIRCUITS Turn the ignition off. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12 volt test light connected to Ground, check the PCM Fused B+ circuits. Wiggle test each circuit during the test to check for an intermittent open in the circuit. NOTE: The test light should be illuminated and bright with the ignition on and not illuminated with the ignition off. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated as described above? Yes Test complete. No Repair the open or short to ground in the PCM Fused B+ circuit(s) for as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .

ENGINE CRANKS BUT DOES NOT START

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

ETC INTERMITTENT NO CRANK CONDITION

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

FUEL PRESSURE LEAK DOWN

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Scheme 650

1. CHECK FUEL DELIVERY SYSTEM FOR LEAKS AND DAMAGE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Visually and physically inspect the fuel delivery system for external leaks and damage. Is the system leaking or damaged? Yes Repair / replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Go To 2 .
2. INSTALL APPROPRIATE FUEL LINE ADAPTERS / FITTING FROM GAS AND DIESEL FUEL PRESSURE/DECAY TESTER 8978A Turn the ignition off. WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Disconnect the frame rail fuel supply line connector between the fuel supply line and the fuel rail. Install the appropriate Fuel Line Adapters / Fitting from Gas and Diesel Fuel Pressure/Decay Tester (special tool #8978A, Decay Tool, Fuel). Go To 3 .
3. INSTALL FUEL PRESSURE GAUGE ASSEMBLY WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Connect Fuel Pressure Gauge Assembly Fuel Inlet Hose (special tool #8978-1, Gauge, Fuel Pressure Assembly) (1) and Fuel Outlet Hose (2) to the Fuel Line Adapters / Fitting. Connect Drain Extension Hose 535680 (3) to the Fuel Pressure Gauge Assembly Drain Hose (5). Connect the Reservoir Assembly 534960 (4) to the Drain Extension Hose 535680 (3). WARNING: To reduce the risk of fire and serious possible serious or fatal injury, place Reservoir Assembly 534960 (4) on the floor and out of the way so that it is not a trip hazard. Go To 4 .
4. CHECK FUEL PRESSURE WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Perform the following procedure to purge air from the system: Open the Fuel System Isolation Valve (1). Close the Flow Test Valve (2). Ignition on, engine not running. With the scan tool, actuate the fuel pump. Open the Flow Test Valve (1) for 10 seconds, then close the Valve. CAUTION: Stop All Actuations. Turn the ignition off. Disconnect, empty and then reconnect the Reservoir Assembly. Turn the ignition on, wait five seconds, turn the ignition off and then wait 1 minute before proceeding. Read the Fuel Pressure Gauge (3) and record the reading. Non SRT-4 fuel pressure specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). SRT-4 fuel pressure specification is 552 KPa +/- 34 KPa (80 psi +/- 5 psi). Is the fuel pressure within specifications? Yes Go To 5 . No Perform the Checking The Fuel Delivery System diagnostic procedure as directed. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(ref-457895-S01221194862012030200000) .
5. CHECK FUEL DELIVERY SYSTEM FOR LEAK DOWN WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury. Close the Fuel System Isolation Valve (1) and then wait five minutes before proceeding. Read the Fuel Inlet (2) and Fuel Outlet (3) Pressure Gauges. The pressure should not drop more than 10 psi on either gauge. Does the fuel pressure drop more than 10 psi? Yes - On Fuel Inlet Gauge (1) Replace the fuel pump module. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . Yes - On Fuel Outlet Gauge (2) Replace the leaking fuel injector(s). Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No If directed here by another test, return to that test. Otherwise, test complete.

HARD START FUEL SYSTEM

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

NO CRANK CONDITION

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

NO RESPONSE WITH A NO START CONDITION

For a complete wiring diagram refer to appropriate SYSTEM WIRING DIAGRAMS article .

Scheme 651

Scheme 652

1. (A919) (A918) PCM FUSED B+ CIRCUITS NOTE: The scan tool and cable must be operating properly for the results of this test to be valid. NOTE: Make sure the ignition switch was on while trying to communicate with the PCM. Turn the ignition off. Disconnect the PCM harness connectors. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Using a 12-volt test light connected to ground probe the appropriate terminal of special tool #(special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 2 . No Repair the open or short to ground in the (A919) Fused B+ circuit. Inspect and replace fuses as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
2. (F202), (F1), (T751) PCM FUSED IGNITION SWITCH CIRCUITS Using a 12-volt test light connected to ground, probe the PCM Fused Ignition Switch Output circuits in the appropriate terminals of special tool #(special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 3 . No Repair the (F202) (F1) (T751) Ignition Switch Output circuits. Inspect and replace fuses as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
3. (Z130), (Z131), AND (Z951) PCM GROUND CIRCUITS Using a 12-volt test light connected to battery voltage, probe the (Z130) (Z131) PCM ground circuits in the appropriate terminals of special tool #(special tool #8815A, Kit, NGC, 38 Position). Does the test light illuminate brightly? Yes Go To 4 . No Repair the PCM ground circuits. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
4. (F855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Connect the PCM harness connectors. Disconnect the Crankshaft Position Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit. Is the voltage between 4.5 and 5.2 volts? Yes Go To 5 . No Go To 6 .
5. CKP SENSOR Turn the ignition off. Disconnect the Throttle Body Harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit in the Throttle Body harness connector. Is the voltage between 4.5 and 5.2 volts? Yes If communication is available with a PCM on a like vehicle, replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Replace the Crankshaft Position Sensor. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .
6. (F855) 5-VOLT SENSOR OPEN/SHORTED Turn the ignition off. Disconnect the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit. Disconnect all the sensors that use the (F855) 5-volt Supply circuit. Did the voltage return to 4.5 to 5.2 volts when disconnecting any of the sensors. Yes Replace the sensor that is pulling down the (F855) 5-volt supply. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Go To 7 .
7. (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect C2 PCM harness connector. Disconnect all the sensors that share the (F855) 5-volt Supply circuit. Measure the resistance between ground and the (F855) 5-volt Supply circuit at one of the sensor harness connectors. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F855) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Go To 8 .
8. (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Disconnect all the sensors that share the (F856) 5-volt Supply circuit. Measure the resistance between ground and the (F856) 5-volt Supply circuit at one of the sensor harness connectors. Is the resistance below 100 ohms? Yes Repair the short to ground in the (F856) 5-volt Supply circuit. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Go To 9 .
9. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the related Sensors and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related Sensors and the Powertrain Control Module connectors. Refer to any Technical Service Bulletins that may apply. Were there any problems found? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) . No Replace and program the Powertrain Control Module per Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000) .

START AND STALL CONDITION

For a complete wiring diagram, refer to appropriate SYSTEM WIRING DIAGRAMS article .

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 653

Scheme 654

1. CHECKING DIAGNOSTIC TROUBLE CODES (DTCS) NOTE: Before continuing with this procedure, review the Technical Service Bulletins (TSBs) that may be related to a start and stall condition. NOTE: It may be helpful to review Secondary Indicators, if a two trip DTC is present, drive the vehicle to try and mature the DTC to Active. Ignition on, engine not running. Using a scan tool, read DTCs. Are any DTCs present? Yes Perform the appropriate diagnostic procedure. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Go To 2.
2. CHECKING WIRELESS IGNITION NODE (WIN) DTCS NOTE: If you are unable to communicate with the Wireless Ignition Node (WIN), and peform the No Response from WIN diagnostic procedure. Refer to «NO RESPONSE FROM WIN (WIRELESS IGNITION NODE)»(ref-457934-S27628313282012030200000). Using the scan tool, read the WIN codes. Are there any active DTCs in the WIN? Yes Perform the appropriate diagnostic procedure. Refer to «Diagnosis and Testing»(ref-457830-S35608729842012030200000). No Go To 3.
3. CAM/CRANK VERIFICATION Using a scan tool, under OBDII Monitors, read and record the Cam Crank Synchronization Event Monitors. CAM EVENT STATUS CM1ULTRH CM1ULTLH CM1TOL1 CM1LOW CM1ULZERO CM1MFS CM1MFR CM1IF CM1ONLY CM2ULTRH CM2ULTLH CM2TOL1 CM2LOW CM2ULZERO CM2MFS CM2MFR CM2IF CM2ONLY CM3ULTRH CM3ULTLH CM3TOL1 CM3LOW CM3ULZERO CM3MFS CM3MFR CM3IF CM3ONLY CM4ULTRH CM4ULTLH CM4TOL1 CM4LOW CM4ULZERO CM4MFS CM4MFR CM4IF CM4ONLY SYULCAM - - - - - CRANK EVENT STATUS CKULTRH CKULTLH CKLOW CKUL60M2 CKMFS CKMFR CK1IF CKULGTRH CKULGTLH CKULGTVR CKULGTVL CKUL220 CKUL40 SYULCRK SYNOCLCK - - - - - - SYNC EVENT STATUS SYULTOL SYTOLF - - - - - Use the table above and determine if any of the values are present in the Cam Crank Synchronization Event Monitor display. CAM EVENT STATUS ONLY Go To 7. CRANK EVENT STATUS ONLY Go To 14. CAM, CKP and/or SYNC EVENT STATUS Go To 21. None Present Go To 4.
4. SPARK PLUG(S) NOTE: Inspect the ignition coil for damage, carbon tracking on the coil or a damaged spark plug insulator boot. If a problem is found, replace the ignition coil. Turn the ignition off. Remove the spark plug. Inspect the spark plug for any of the following conditions: Cracks or damage Carbon tracking Foreign material Gap not within specification Loose or broken electrode NOTE: Lightly tap the bottom of the spark plug on a solid surface. The electrode in the spark plug should not move. Were any problems found? Yes Replace the spark plug. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Go To 5.
5. POSSIBLE CAUSES OF START AND STALL CONDITION The following items should be checked as a possible cause for a start and stall condition: Perform any Technical Service Bulletins (TSBs) that may apply to the symptom. The exhaust system must be free of any restrictions. The engine compression must be within specifications. The engine valve timing must be within specifications. The engine must be free from vacuum leaks. The throttle body must be free of carbon buildup and dirt. Cracked spark plugs, carbon track on spark plugs, spark plug wires if applicable, coil and coil boot. Do any of the above conditions exist? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Go To 6.
6. FUEL PUMP DELIVERY Verify that the Fuel tank is not empty before continuing. Perform the Checking the Fuel Delivery System diagnostic procedure. Refer to «CHECKING THE FUEL DELIVERY SYSTEM»(ref-457895-S01221194862012030200000). Was the No Start condition solved after following the above diagnostic test? Yes Test Complete. No Check for contamination/water in the fuel. Make sure the fuel being used in this vehicle meets OEM Fuel Requirement, perform the appropriate service procedure. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
7. 5 VOLT SUPPLY CIRCUIT VOLTAGE (CMP) Turn the ignition off. Disconnect the Camshaft Position Sensor connector. Turn the ignition on. Measure the voltage of the 5 Volt Supply circuit in the Camshaft Position Sensor harness connector. Is the voltage 5.0 Volts? Yes Go To 8. No Repair the 5 Volt Supply. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
8. SENSOR GROUND CIRCUIT TEST Turn the ignition off. Using a 12-volt test light connected to 12 Volts, probe the Sensor Ground circuit in the Camshaft Position Sensor harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To 9. No Repair the Ground Circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
9. CMP SIGNAL Turn the ignition on. Measure the voltage of the CMP Signal circuit in the Camshaft Position Sensor harness connector. Is the voltage between 4.7 and 5.0 Volts? Yes Go To 13. No Go To 10.
10. CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Powertrain Control Module harness connector. Turn the ignition on. Measure the voltage of the CMP Signal circuit in the Camshaft Position Sensor harness connector. Is there any voltage present? Yes Repair the CMP Signal circuit for a short to voltage. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Go To 11.
11. CMP SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the CMP Signal circuit in the Camshaft Position Sensor harness connector. Is the resistance above 100 Ohms? Yes Go To 12. No Repair the CMP Signal circuit for a short to ground. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
12. CMP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the CMP Signal circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 24. No Repair the CMP Signal circuit for an open circuit or excessive resistance. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
13. CAMSHAFT POSITION SENSOR SIGNAL Turn the ignition off. (Scheme 653) is a depiction of typical scope patterns of the Cam (1) and Crank (2) sensors for 4, 6 and 8 cylinder engines. The square wave patterns are uniform and are identical to one another. The patterns must be evenly spread apart and at the same height. The larger gap pattern (signature) after the shorter wave forms are used for cylinder identification (Crank signal) and the distance between the series of slots (trigger) on the camshaft pulley (cam signal). Any variation of the pattern will indicate an issue with the sensor, wiring or trigger (target) wheel. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) along with the Adapter (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. With a lab scope, probe the CMP Signal circuit in the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. Start and allow the engine to run. Observe the lab scope screen. Compare the scope pattern with the ones in (Scheme 654). 1. Pattern indicates a clean (good) square wave form that is identical to what the cam and crank should be. The square wave patterns are uniformed and are identical to one another. 2. Two pulses joined together in the same spot on target. Indicates damage to the target (trigger) on the flexplate or broke tooth, runout in the target or large airgap between the sensor and the target wheel. 3. Wide airgap or intermittent connection. 4. Early signature, predominately at high speed. Large airgap between the sensor and the target wheel. 5. Missed pulse. Possible burr or light damage to target or incorrect lateral position of the crank sensor to target (trigger). NOTE: If any of the above (except pattern 1) is displayed on the lab scope repair as necessary. Was the square wave found to match any of the above except pattern 1? Yes Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Replace the Camshaft Position Sensor in accordance with the Service Information. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
14. 5 VOLT SUPPLY CIRCUIT VOLTAGE (CKP) Turn the ignition off. Disconnect the Crankshaft Position Sensor connector. Turn the ignition on. Measure the voltage of the 5 Volt Supply circuit in the Crankshaft Position Sensor harness connector. Is the voltage 5.0 Volts? Yes Go To 15. No Repair the 5 Volt Supply for an open circuit or excessive resistance. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
15. SENSOR GROUND CIRCUIT TEST Turn the ignition off. Using a 12-volt test light connected to 12 Volts, check the Sensor Ground circuit in the Crankshaft Position Sensor harness connector. NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Go To 16. No Repair the Ground Circuit for an open circuit or excessive resistance. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
16. CKP SIGNAL Turn the ignition on. Measure the voltage of the CKP Signal circuit in the Crankshaft Position Sensor harness connector. Is the voltage between 4.7 and 5.0 Volts? Yes Go To 20. No Go To 17.
17. CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Powertrain Control Module (PCM) harness connector. Turn the ignition on. Measure the voltage of the CKP Signal circuit in the Crankshaft Position Sensor harness connector. Is there any voltage present? Yes Repair the CKP Signal circuit for a short to voltage. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Go To 18.
18. CKP SIGNAL CIRCUIT SHORTED TO GROUND Turn the ignition off. Measure the resistance between ground and the CKP Signal circuit in the Crankshaft Position Sensor harness connector. Is the resistance above 100 Ohms? Yes Go To 19. No Repair the CMP Signal circuit for a short to ground. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
19. CKP SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals, resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) to perform diagnosis. Measure the resistance of the CKP Signal circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). Is the resistance below 5.0 Ohms? Yes Go To 24. No Repair the CMP Signal circuit for an open circuit or high resistance. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
20. CRANKSHAFT POSITION SENSOR SIGNAL Turn the ignition off. see scheme 27 is a depiction of typical scope patterns of the Cam (1) and Crank (2) sensors for 4, 6 and 8 cylinder engines. The square wave patterns are uniform and are identical to one another. The patterns must be evenly spread apart and at the same height. The larger gap pattern (signature) after the shorter wave forms are used for cylinder identification (Crank signal) and the distance between the series of slots (trigger) on the camshaft pulley (cam signal). Any variation of the pattern will indicate an issue with the sensor, wiring and trigger (target) wheel. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position) along with the Adapter (special tool #8815-1, PCM Pinout Box Adapter) to perform the diagnosis. With a lab scope, probe the CKP Signal circuit in the appropriate terminal of the PCM Pinout Box (special tool #8815A, Kit, NGC, 38 Position). WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury. Start and allow the engine to run. Observe the lab scope screen. Compare the scope pattern with the ones in see scheme 28. 1. Pattern indicates a clean (good) square wave form that is identical to what the cam and crank should be. The square wave patterns are uniformed and are identical to one another. 2. Two pulses joined together in the same spot on target. Indicates damage to the target (trigger) on the flexplate or broke tooth, runout in the target or large airgap between the sensor and the target wheel. 3. Wide airgap or intermittent connection. 4. Early signature, predominately at high speed. Large airgap between the sensor and the target wheel. 5. Missed pulse. Possible burr or light damage to target or incorrect lateral position of the crank sensor to target (trigger). NOTE: If any of the above (except pattern 1) is displayed on the lab scope repair as necessary. Was the square wave found to match any of the above except pattern 1? Yes Repair as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Replace the Crankshaft Position Sensor. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
21. VALVE TIMING Make sure the valve timing is within specification. Go to appropriate ENGINE - SERVICE INFORMATION, VALVE TIMING of engine being diagnosed. Was the valve timing within specification? Yes Go To 22. No Repair as necessary. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
22. 5 VOLT SUPPLY CIRCUIT VOLTAGE (CMP/CKP) NOTE: The 5 Volt Supply circuit must be present at both CMP and CKP Sensors. Turn the ignition off. Disconnect the Camshaft Position Sensor connector. Turn the ignition on. Measure the voltage of the 5 Volt Supply circuit in the Camshaft Position Sensor harness connector. Repeat the above test at the Crankshaft Position Sensor (Crankshaft Position Sensor harness connector measure). Is the voltage 5.0 Volts at each sensor? Yes Go To 23. No Repair the 5 Volt Supply circuit(s) as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
23. SENSOR GROUND CIRCUIT NOTE: The Ground circuit must be present at both CMP and CKP Sensors. Turn the ignition off. Using a 12-volt test light connected to 12 Volts, probe the Sensor Ground circuit in the Camshaft Position Sensor harness connector. Repeat the above test at the Crankshaft Position Sensor (Crankshaft Position Sensor harness connector measure). NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery. Is the test light illuminated and bright? Yes Replace both the Camshaft Position Sensor and Crankshaft Position Sensor in accordance with the Service Information. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Repair the Ground Circuit(s) as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).
24. POWERTRAIN CONTROL MODULE (PCM) Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Camshaft Position Sensor and the Powertrain Control Module (PCM). Look for any chafed, pierced, pinched or partially broken wires. Look for broken, bent, pushed out or corroded terminals. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. Look for the data to change or for the DTC to reset during the wiggle test. Perform any Technical Service Bulletins (TSBs) that may apply. Were any problems found? Yes Repair as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000). No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform the POWERTRAIN VERIFICATION TEST. Refer to «POWERTRAIN VERIFICATION TEST»(ref-457896-S03919949562012030200000).