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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 628 (Powertrain Diagnostic Procedures - DRIVEABILITY - NGC Symptoms & Diagnostic Tests (DTCS P0016 To P0563)) >> DRIVEABILITY - NGC - Diagnostic Tests >> P0340-Camshaft Position Sensor Circuit (Gas - NGC) >> Diagnostics Procedures

Diagnostics Procedures

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. Crank the engine.

    Ignition on, engine not running.

    With the DRBIII®, read the DTCs and record the related Freeze Frame data.

    Is the Good Trip Counter displayed and equal to zero?

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

    Is the voltage between 4.5 and 5.2 volts?

    1. Yes --> Go To 3
    2. No --> Go To 10
  3. 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?

    1. Yes --> Go To 4
    2. No --> Go To 7
  4. Turn the ignition off.

    Disconnect the PCM harness connectors.

    CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WELL 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?

    1. Yes --> Go To 5
    2. No --> Repair the open in the (K900) Sensor ground circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  5. Measure the resistance between the (K44) CMP Signal circuit and the (P856) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the resistance below 5.0 ohms?

    1. Yes --> Repair the short between the (K44) CMP Signal circuit and the (F856) 5-volt Supply circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 6
    6. NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.
  6. If there are no possible causes remaining, view repair.
    1. Repair
      1. Replace the Camshaft Position Sensor.
      2. Perform POWERTRAIN VERIFICATION TEST VER - 5 .
  7. 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 5.2 volts?

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

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 8
  8. 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?

    1. Yes --> Go To 9
    2. No --> Repair the open in the (K44) CMP Signal circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

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

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (K44) CMP 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 (F856) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the voltage above 5.2 volts?

    1. Yes --> Repair the short to voltage in the (F856) 5-volt Supply circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 11
  11. 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?

    1. Yes --> Go To 12
    2. No --> Repair the open in the (F856) 5-volt Supply circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

  12. Measure the resistance between ground and the (F856) 5-volt Supply circuit in the CMP Sensor harness connector.

    Is the resistance below 100 ohms?

    1. Yes --> Repair the short to ground in the (F856) 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. Turn the ignition off.

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

    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.

    Ignition on, engine not running.

    Wiggle the related wire harness and lightly tap the Crank 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?

    1. Yes --> Replace the Crankshaft Position Sensor.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Go To 15
  15. Turn the ignition off.

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

    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.

    Ignition on, engine not running.

    Wiggle the related wire harness and lightly tap on the Cam 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?

    1. Yes --> Replace the Camshaft Position Sensor.

      Perform POWERTRAIN VERIFICATION TEST VER - 5 .

    2. No --> Test Complete.
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