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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0325 To P0501 >> P0339-Crankshaft Position Sensor Intermittent >> Diagnostic Test

Diagnostic Test

  1. 1) ACTIVE DTC 

    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. Refer to INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) CHECKING CRANKSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE 

    Turn the ignition off.

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

    Observe the lab scope screen.

    Start the engine.

    Observe the lab scope screen.

    Are there any irregular or missing signals? 

    Yes 

    1. Go to  3).

    No 

    1. Go to  8).
  3. 3) WIRE HARNESS INSPECTION 

    Turn the ignition off.

    Visually inspect the related wire harness including the ground circuit. Look for any chafed, pierced, pinched, or partially broken wires.

    Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.

    Make sure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are torqued to the proper specification.

    Refer to any TSBs that may apply.

    Were any of the above conditions present? 

    Yes 

    1. Repair as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (F855) 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND 
    Fig 1: Measuring Voltage On Primary 5-Volt Supply Circuit
    GC0058520Courtesy of CHRYSLER LLC

    Disconnect the CKP Sensor connector.

    Ignition on, engine not running.

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

    Is the voltage between 4.5 and 5.2 volts? 

    Yes 

    1. Go to  5).

    No 

    1. Repair the open or short to ground in the (F855) 5-volt Supply circuit. Use Miller special tool #8815 when checking for an open circuit to prevent PCM harness connector terminal damage.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5) TONE WHEEL/FLEX PLATE INSPECTION 

    Turn the ignition off.

    Carefully disconnect the Negative Battery (Ground) cable.

    Remove the Crankshaft Position Sensor.

    Inspect the Tone Wheel/Flex Plate slots for damage, foreign material, or excessive movement.

    Were any problems found? 

    Yes 

    1. Repair or replace the Tone Wheel/Flex Plate as necessary.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  6).
  6. 6) CHECKING CAMSHAFT POSITION SENSOR SIGNAL WITH A LAB SCOPE 

    Install the CKP Sensor and connect the battery cable.

    NOTE: An intermittent condition in the Cam Position Sensor can cause the P0339 to set.

    With the a lab scope probe and the Miller special tool #6801, backprobe the (K44) CMP Signal circuit in the Sensor 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 Cam Position Sensor.

    Observe the lab scope screen.

    Start the engine.

    Observe the lab scope screen.

    Are there any irregular or missing signals? 

    Yes 

    1. Replace the Cam Position Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  7).
  7. 7) CRANKSHAFT POSITION SENSOR 

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace the Crankshaft Position Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .
  8. 8) (K24) CKP SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Measuring Voltage On CKP Signal Circuit
    GC0058521Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the C2 PCM harness connector.

    Disconnect the CKP Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (K24) CKP Signal circuit in the Sensor harness connector.

    Wiggle the related wire harness while taking this measurement.

    Is there any voltage present? 

    Yes 

    1. Repair the short to voltage in the (K24) CKP Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  9).
  9. 9) (K24) CKP SIGNAL CIRCUIT OPEN 
    Fig 3: Measuring Resistance Of CKP Signal Circuit
    GC0058524Courtesy 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 in the (K24) CKP Signal circuit from the CKP harness connector to the appropriate terminal of special tool #8815.

    Wiggle the wire harness while taking this measurement.

    Is the resistance below 1.0 ohm? 

    Yes 

    1. Go to  10).

    No 

    1. Repair the excessive resistance in the (K24) CKP Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  10. 10) (K24) CKP SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 4: Measuring Resistance Between Ground And CKP Signal Circuit
    GC0058525Courtesy of CHRYSLER LLC

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

    Wiggle the related wire harness while monitoring the resistance value.

    Does the resistance ever go below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K24) Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  11).
  11. 11) (K24) CKP SIGNAL CIRCUIT SHORTED TO THE (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 5: Measuring Resistance Between CKP Signal Circuit And 5-Volt Supply Circuit
    GC0058523Courtesy of CHRYSLER LLC

    Measure the resistance between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit in the CKP harness connector.

    Wiggle the related wire harness while taking this measurement.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short between the (F855) 5-volt Supply circuit and the (K24) CKP Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go to  12).
  12. 12) 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 .
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