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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 >> P0320-No Crank 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. Ignition on, engine not running.

    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 test drive the vehicle.

    Does the DTC return?

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

    Disconnect the CKP Sensor harness connector.

    Ignition on, engine not running.

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

    Is the voltage between 4.8 and 5.2 volts?

    1. Yes --> Go To 3
    2. No --> Go To 10
  3. Measure the voltage on the (K24) CKP Sensor Signal circuit at the CKP 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 CKP 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 slots on the flywheel for damage. If a problem is found repair as necessary.
  5. If there are no possible causes remaining, view repair.
    1. Repair
      1. Replace the Crankshaft 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 of the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector.

    Is the voltage above 5.3 volts?

    1. Yes --> Repair the short to voltage in the (K24) CKP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

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

    Measure the resistance of the (K24) CKP Sensor Signal circuit from the CKP 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 (K24) CKP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  8. Measure the resistance between ground and the (K24) CKP Sensor Signal circuit at the CKP Sensor harness connector.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (K24) CKP Sensor Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 9
  9. Measure the resistance between the (K24) CKP Sensor Signal circuit and the (K7) 5-volt Supply circuit at the CKP Sensor harness connector.

    Is the resistance below 5.0 ohms?

    1. Yes --> Repair the short between the (K7) 5-volt Supply circuit and the (K24) CKP 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 of the (K7) 5-volt Supply circuit at the CKP Sensor harness connector.

    Is the voltage above 5.3 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 CKP Sensor harness connector to the PCM harness connector.

    Is the resistance below 5.0 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 CKP 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 Crank 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 (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.

    Start the engine.

    Lightly tap on the Crank Sensor and wiggle the CKP Sensor connector and the related 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?

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

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 15
    15. NOTE: An intermittent failure with the Cam Position Sensor may cause the P0320 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. Turn the ignition off.

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

    Ignition on, engine not running.

    Wiggle the related wire harness and gently tap on the Cam Position Sensor.

    Monitor the lab scope screen.

    Start the engine.

    Lightly tap on the CMP Sensor and wiggle the related wire harness.

    Observe the lab scope screen, looking 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 --> Test Complete.
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