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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 627 (Powertrain Diagnostic Procedures - DRIVEABILITY - Gas - Symptom & Diagnostic Tests (DTCS P0031 To P1899)) >> DRIVEABILITY - Gas - Diagnostic Tests >> P0340-No Cam Reference Signal At Pcm (Gas - Except NGC) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.
  1. With the DRBIII®, read DTCs and record the related Freeze Frame data.

    With the DRBIII®, erase DTCs.

    Start the engine.

    If the DTC does not set right away it may be necessary to take the vehicle on a test drive.

    Does the DTC return?

    1. Yes --> Go To 2
    2. No --> Go To 14
  2. Turn the ignition off.

    Disconnect the CMP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (K7) 5-volt Supply circuit at the CMP Sensor harness connector.

    Is the voltage between 4.8 and 5.2 volts?

    1. Yes --> Go To 3
    2. No --> Go 1b 10
  3. Measure the voltage on the (K44) CMP Sensor Signal circuit at the CMP Sensor harness connector.

    Is the voltage between 4.5 and 5.0 volts?

    1. Yes --> Go To 4
    2. No --> Go To 6
  4. Turn the ignition off.

    Disconnect the PCM harness connectors.

    Measure the resistance of the (K4) Sensor ground circuit from the CMP Sensor harness connector to the PCM harness connector.

    Is the resistance below 5.0 ohms?

    1. Yes --> Go To 5
    2. No --> Repair the open in the (K4) Sensor ground circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    5. NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.
  5. If there are no possible causes remaining, view repair.
    1. Repair
      1. Replace the Camshaft Position Sensor.
      2. Perform POWERTRAIN VERIFICATION TEST VER - 5 .
  6. Turn the ignition off.

    Disconnect the PCM harness connectors.

    Ignition on, engine not running.

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

    Is the voltage above 5.2 volts?

    1. Yes --> Repair the short to voltage in the (K44) CMP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 7
  7. Turn the ignition off.

    Measure the resistance of the (K44) CMP Sensor Signal circuit from the CMP Sensor harness connector to the PCM harness connector.

    Is the resistance below 5.0 ohms?

    1. Yes --> Go To 8
    2. No --> Repair the open in the (K44) CMP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

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

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (K44) CMP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 9
  9. Measure the resistance between the (K44) CMP Sensor Signal circuit and the (K7) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short between the (K7) 5-volt Supply circuit and the (K44) CMP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 13
  10. Turn the ignition off.

    Disconnect the PCM harness connectors.

    Ignition on, engine not running.

    Measure the voltage on the (K7) 5-volt Supply circuit at the CMP Sensor harness connector.

    Is the voltage above 5.2 volts?

    1. Yes --> Repair the short to voltage in the (K7) 5-volt Supply circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 11
  11. Turn the ignition off.

    Measure the resistance of the (K7) 5-volt Supply circuit from the CMP Sensor harness connector to the PCM harness connector.

    Is the resistance below 5.2 ohms?

    1. Yes --> Go To 12
    2. No --> Repair the open in the (K7) 5-volt Supply circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  12. Measure the resistance between ground and the (K7) 5-volt Supply circuit at the CMP Sensor harness connector.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (K7) 5-volt Supply circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 13
    13. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  13. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    If there are no possible causes remaining, view repair.

    1. Repair
      1. Replace and program the Powertrain Control Module per Service Information.
      2. Perform POWERTRAIN VERIFICATION TEST VER - 5 .
    14. NOTE: The following tests may help in identifying a possible intermittent condition with the Cam Sensor or its related wire harness.
    WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR, HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
  14. Ignition on, engine not running.

    With the DRBIII® as a Dual Channel Lab Scope and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the Cam Sensor connector and the PCM harness connector.

    Wiggle the related wire harness and connections.

    Monitor the lab scope screen.

    Start the engine.

    Lightly tap on the Cam Sensor and wiggle the CMP Sensor connector and wire harness.

    Observe the lab scope screen.

    Look for any erratic pulses generated by the CMP Sensor.

    Did the CMP Sensor generate any erratic pulses?

    1. Yes --> Carefully inspect the wire harness and connections, repair as necessary, if ok, replace the Cam Position Sensor.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 15
    15. NOTE: An intermittent Crank Position Sensor failure may cause the P0340 code to set.
    WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
  15. Ignition on, engine not running.

    With the DRBIII® as a Dual Channel Lab Scope and the Miller special tool #6801, backprobe the (K24) CKP Signal circuit in the Crank Sensor connector and the PCM harness connector.

    Wiggle the related wire harness and connections.

    Monitor the lab scope screen.

    16. Start the engine.

    Lightly tap on the Crank Sensor and wiggle the CKP Sensor connector and wire harness.

    Observe the lab scope screen.

    Look for any erratic pulses generated by the CKP Sensor.

    Did the CKP Sensor generate any erratic pulses?

  16. Yes --> Carefully inspect the wire harness and connections, repair as necessary, if ok, replace the Crank Position Sensor.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  17. No --> Test Complete.
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