Intermittent No Crank Condition Tests: Other Dodge Nitro I

*ETC INTERMITTENT NO CRANK CONDITION

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

*FUEL PRESSURE LEAK DOWN

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

*HARD START (FUEL SYSTEM)

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

*NO RESPONSE WITH A NO START CONDITION

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

Scheme 546

Scheme 547

Scheme 548

Scheme 549

1. (A209) PCM FUSED B+ CIRCUIT 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 C1 PCM harness connector. 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 Miller Special Tool #8815 to perform diagnosis. Using a 12-volt test light connected to ground probe the appropriate terminal of special tool #8815. Does the test light illuminate brightly? Yes Go To step 2 . No Repair the open or short to ground in the (A209) Fused B+ circuit. Inspect and replace fuses as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
2. (F1) PCM FUSED IGNITION SWITCH CIRCUIT Using a 12-volt test light connected to ground, probe the (F1) PCM Fused Ignition Switch Output circuit in the appropriate terminals of special tool #8815. Does the test light illuminate brightly? Yes Go To step 3 . No Repair the (F1) Ignition Switch Output circuit. Inspect and replace fuses as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
3. (Z933) PCM GROUND CIRCUITS Using a 12-volt test light connected to battery voltage, probe the (Z933) PCM ground circuits in the appropriate terminals of special tool #8815. Does the test light illuminate brightly? Yes Go To step 4 . No Repair the (Z933) PCM ground circuits. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
4. (K855) 5-VOLT SUPPLY CIRCUIT Turn the ignition off. Connect the C2 PCM harness connector. Disconnect the Crankshaft Position Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K855) 5-volt Supply circuit. Is the voltage between 4.5 and 5.2 volts? Yes Go To step 5 . No Go To step 6 .
5. CKP SENSOR Turn the ignition off. Disconnect the Throttle Body harness connector. Ignition on, engine not running. Measure the voltage on the (K855) 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace the Crankshaft Position Sensor. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .
6. (K855) 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 (K855) 5-volt Supply circuit. Disconnect all the sensors that use the (K855) 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 (K855) 5-volt supply. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To step 7 .
7. (K855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Turn the ignition off. Disconnect PCM harness connectors. Disconnect all the sensors that share the (K855) 5-volt Supply circuit. Measure the resistance between ground and the (K855) 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 (K855) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To step 8 .
8. (K857) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND Disconnect all the sensors that share the (K857) 5-volt Supply circuit. Measure the resistance between ground and the (K857) 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 (K857) 5-volt Supply circuit. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Go To step 9 .
9. POWERTRAIN CONTROL MODULE (PCM) NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits. Were there any problems found? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) . No Replace and program the Powertrain Control Module per Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000) .

*START AND STALL CONDITION

For complete wiring diagrams refer to SYSTEM WIRING DIAGRAMS article.

Scheme 550

Scheme 551

1. CHECKING DTCS NOTE: Before continuing with this procedure, review the TSBs that mat be related to a start and stall condition. NOTE: It may be helpful to review Secondary Indicators, if a two trip DTC(s) is present, drive the vehicle to try and mature the DTC to Active. Ignition on, engine not running. With a scan tool, read DTCs. Are any DTCs present? Yes Refer to the appropriate Diagnostic Procedure. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Go To step 2.
2. CHECKING VEHICLE THEFT DTCS NOTE: If you are unable to communicate with the SKIM/SKREEM, refer to the «VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS»(ref-306165-S32600166862008120900000) and perform the appropriate diagnostics. With the scan tool, read the SKIM/SKREEM codes. Are there any SKIM/SKREEM DTCs? Yes Refer to the Sentry Key «VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS»(ref-306165-S32600166862008120900000). Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Go To step 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 step 7. CRANK EVENT STATUS ONLY Go To step 14. CAM, CKP and/or SYNC EVENT STATUS Go To step 21. None Present Go To step 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Go To step 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. Refer to 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, coil and coil boot. Do any of the above conditions exist? Yes Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Go To step 6.
6. FUEL PUMP DELIVERY Verify that the Fuel tank is not empty before continuing. Follow the diagnostics for Checking Fuel Delivery in this manual. Was the No Start condition solved after following the above diagnostic test? Yes Test Complete. No Check for contamination/water in the fuel. Ensure the fuel being used in this vehicle meets OEM Fuel Requirement. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 8. No Repair the 5 Volt Supply. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 9. No Repair the Ground Circuit NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 13. No Go to step 10.
10. CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Powertrain Control Module 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Go to step 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 step 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the CMP Signal circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to step 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
13. CAMSHAFT POSITION SENSOR SIGNAL Turn the ignition off. see scheme 1 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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. With a lab scope, probe the CMP Signal circuit in the appropriate terminal of the special tool #8815. 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 can result in personal injury or death. Start and allow the engine to run. Observe the lab scope screen. Compare the scope pattern with the ones in see scheme 2. 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 air gap between the sensor and the target wheel. 3. Wide air gap or intermittent connection. 4. Early signature, predominately at high speed. Large air gap 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Replace the Camshaft Position Sensors. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 15. No Repair the 5 Volt Supply. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 16. No Repair the Ground Circuit. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 20. No Go to step 17.
17. CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the Powertrain Control Module (PCM) 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Go to step 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 step 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 Miller Special Tool #8815 to perform diagnosis. Measure the resistance of the CKP Signal circuit between the Camshaft Position Sensor harness connector and the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes Go to step 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
20. CRANKSHAFT POSITION SENSOR SIGNAL Turn the ignition off. see scheme 1 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 Miller Special Tool #8815 along with the #8815-1 to perform the diagnosis. With a lab scope, probe the CKP Signal circuit in the appropriate terminal of the special tool #8815. 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 can result in personal injury or death. Start and allow the engine to run. Observe the lab scope screen. Compare the scope pattern with the ones in see scheme 2. 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 air gap between the sensor and the target wheel. 3. Wide air gap or intermittent connection. 4. Early signature, predominately at high speed. Large air gap 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Replace the Crankshaft Position Sensor. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
21. VALVE TIMING Ensure the valve timing is within specification. Refer to «VALVE TIMING - 3.7L»(ref-306142-S07134686192008120900000) or «VALVE TIMING - 4.0L»(ref-306143-S41714748632008120900000). Was the valve timing within specification? Yes Go to step 22. No Repair as necessary. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 step 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Repair the Ground Circuit(s) as necessary. NOTE: A battery disconnect must be performed to clear the Cam Crank Synchronization Events. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).
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. Refer to any Technical Service Bulletins 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 «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000). No Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Perform «POWERTRAIN VERIFICATION TEST»(ref-306217-S13377649292008120900000).