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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.4L Engine - DTCS P0335 To P0508 >> Diagnosis And Testing >> P0340-Camshaft Position Sensor Circuit >> Diagnostic Test

Diagnostic Test

  1. 1)  ACTIVE DTC 

    Crank the engine.

    Ignition on, engine not running.

    With a scan tool read the DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Go To  14).
  2. 2)  (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: MEASURING VOLTAGE ON THE 5-VOLT SUPPLY CIRCUIT
    GC0041646Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the CMP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the voltage between 4.5 and 5.2 volts? 

    Yes 

    1. Go To  3).

    No 

    1. Go To  10).
  3. 3)  (K44) CMP SIGNAL CIRCUIT 
    Fig 2: MEASURING VOLTAGE ON THE CMP SIGNAL CIRCUIT
    GC0041649Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.

    Is the voltage between 4.5 and 5.0 volts? 

    Yes 

    1. Go To  4).

    No 

    1. Go To  7).
  4. 4)  (K900) SENSOR GROUND CIRCUIT OPEN 
    Fig 3: MEASURING RESISTANCE OF THE SENSOR GROUND CIRCUIT
    GC0041653Courtesy of DAIMLERCHRYSLER CORP.

    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 Miller Special Tool No. 8815 to perform diagnosis.

    Measure the resistance of the (K900) Sensor ground circuit from the CMP Sensor harness connector to the appropriate terminal of special tool No. 8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open in the (K900) Sensor ground circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  (K44) CMP SIGNAL SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 4: MEASURING RESISTANCE BETWEEN THE CMP SIGNAL CIRCUIT AND 5-VOLT SUPPLY CIRCUIT
    GC0041652Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between the (K44) CMP Signal circuit and the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (K44) CMP Signal circuit and the (F855) 5-volt Supply circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  6).
  6. 6)  CAMSHAFT POSITION SENSOR 
    NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace the Camshaft Position Sensor.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  7. 7)  (K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 5: MEASURING VOLTAGE ON THE CMP SIGNAL CIRCUIT
    GC0041649Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Ignition on, engine not running.

    Measure the voltage on the (K44) CMP Signal circuit in the CMP Sensor harness connector.

    Is the voltage above 0 volts? 

    Yes 

    1. Repair the short to battery voltage in the (K44) CMP Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  8).
  8. 8)  (K44) CMP SIGNAL CIRCUIT OPEN 
    Fig 6: MEASURING RESISTANCE ON THE CMP SIGNAL CIRCUIT
    GC0041650Courtesy of DAIMLERCHRYSLER CORP.

    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 Miller Special Tool No. 8815 to perform diagnosis.

    Measure the resistance of the (K44) CMP Signal circuit from the CMP Sensor harness connector to the appropriate terminal of special tool No. 8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  9).

    No 

    1. Repair the open in the (K44) CMP Signal circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  9. 9)  (K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 7: MEASURING RESISTANCE BETWEEN GROUND AND THE CMP SIGNAL CIRCUIT
    GC0041651Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K44) CMP Signal circuit in the CMP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K44) CMP Signal circuit
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  10).
  10. 10)  (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 8: MEASURING VOLTAGE ON THE 5-VOLT SUPPLY CIRCUIT
    GC0041646Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Ignition on, engine not running.

    Measure the voltage on the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the voltage above 0 volts? 

    Yes 

    1. Repair the short to battery voltage in the (F855) 5-volt Supply circuit.
    2. Perform NGC POWERTRAIN VERIFICATION TEST VER - 1 .

    No 

    1. Go To  11).
  11. 11)  (F855) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 9: MEASURING RESISTANCE OF THE 5-VOLT SUPPLY CIRCUIT
    GC0041647Courtesy of DAIMLERCHRYSLER CORP.

    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 Miller Special Tool No. 8815 to perform diagnosis.

    Measure the resistance of the (F855) 5-volt Supply circuit between the CMP Sensor harness connector to the appropriate terminal of special tool No. 8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  12).

    No 

    1. Repair the open in the (F855) 5-volt Supply circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  12. 12)  (F855) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 10: MEASURING RESISTANCE BETWEEN GROUND AND THE 5-VOLT SUPPLY CIRCUIT
    GC0041648Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (F855) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (F855) 5-volt Supply circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  13).
  13. 13)  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 

    1. Repair as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  14. 14)  ERRATIC CMP SIGNAL 

    With a lab scope probe and the Miller special tool #6801, back probe the (K44) CMP Signal circuit in the CMP harness connector.

    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.

    Ignition on, engine not running.

    Wiggle the related wire harness and lightly tap the Camshaft Position Sensor.

    Observe the lab scope screen.

    Allow the engine to idle.

    Observe the lab scope screen.

    Did the CMP Sensor generate any erratic pulses? 

    Yes 

    1. Replace the Camshaft Position Sensor.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  15).
  15. 15)  ERRATIC CKP SIGNAL 

    Turn the ignition off.

    With a lab scope probe and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the CKP harness connector.

    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.

    Ignition on, engine not running.

    Wiggle the related wire harness and lightly tap on the Crankshaft Position Sensor.

    Observe the lab scope screen.

    Allow the engine to idle.

    Observe the lab scope screen.

    Did the CKP Sensor generate any erratic pulses? 

    Yes 

    1. Replace the Crankshaft Position Sensor.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Test Complete.
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