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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0325 To P0501 >> 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, select View DTCs.

    Is the DTC Active at this time? 

    Yes 

    1. Go to  2).

    No 

    1. Go to  14).
  2. 2) (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Checking CMP Sensor 5-Volt Supply Circuit
    GC0002836Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the CMP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F856) 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: Checking CMP Sensor Signal Circuit
    GC0002839Courtesy of CHRYSLER LLC

    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: Checking Camshaft Position Sensor Ground Circuit For Open
    GC0002841Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C2 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.

    Measure the resistance of the (K900) Sensor ground circuit from the CMP Sensor harness connector to the appropriate terminal of special tool #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 POWERTRAIN VERIFICATION TEST .
  5. 5) (K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT 
    Fig 4: Checking Camshaft Position Sensor Signal Circuit & 5-Volt Supply Circuit
    GC0002840Courtesy of CHRYSLER LLC

    Measure the resistance between the (K44) CMP Signal circuit and the (F856) 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 (F856) 5-volt Supply circuit.
    2. Perform 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 POWERTRAIN VERIFICATION TEST .
  7. 7) (K44) CMP SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 5: Checking CMP Sensor Signal Circuit
    GC0002839Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C2 PCM harness connector.

    Ignition on, engine not running.

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

    Is there any voltage present? 

    Yes 

    1. Repair the short to voltage in the (K44) CMP Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  8).
  8. 8) (K44) CMP SIGNAL CIRCUIT OPEN 
    Fig 6: Checking Camshaft Position Sensor Signal Circuit For Open
    GC0002838Courtesy of CHRYSLER LLC

    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 #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 #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 POWERTRAIN VERIFICATION TEST .
  9. 9) (K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 7: Checking Camshaft Position Sensor Signal Circuit For Short To Ground
    GC0002842Courtesy of CHRYSLER LLC

    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 POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  10).
  10. 10) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE 
    Fig 8: Checking CMP Sensor 5-Volt Supply Circuit
    GC0002836Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C1 PCM harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the short to voltage in the (F856) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  11).
  11. 11) (F856) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 9: Checking Auxiliary 5-Volt Supply Circuit For Open
    GC0002835Courtesy of CHRYSLER LLC

    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 #8815 to perform diagnosis.

    Measure the resistance of the (F856) 5-volt Supply circuit between the CMP Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go to  12).

    No 

    1. Repair the open in the (F856) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  12. 12) (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 10: Checking 5-Volt Supply Circuit For Short To Ground
    GC0002837Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (F856) 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 (F856) 5-volt Supply circuit.
    2. Perform 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 POWERTRAIN VERIFICATION TEST .

    No 

    1. Replace and program the Powertrain Control Module per Service Information.
    2. Perform 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 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 POWERTRAIN VERIFICATION TEST .

    No 

    1. Test complete, the conditions that set this DTC are not present at this time
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