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DTC P0339: Crankshaft Position Sensor Intermittent: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  13.
    2. 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.
  2. With the DRBIII®, read and record Freeze Frame Data specific to the CKP Sensor Signal, ECT, RPM, Sync state, vehicle speed, etc. Turn the ignition off. With the DRBIII® lab scope probe and the Miller Special Tool (6801), backprobe the CKP Sensor Signal circuit at the CKP Sensor harness connector. Turn 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? If yes, go to next step. If no, go to step  8.
  3. 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. Ensure the Crankshaft Position Sensor and the Camshaft Position Sensor are properly installed and the mounting bolt(s) are tight. Refer to any Technical Service Bulletins (TSB) that may apply. Were any of the above conditions present? If yes, repair as necessary. If no, go to next step.
  4. Turn the ignition off. Disconnect the CKP Sensor harness connector. Turn ignition on, engine not running. Measure the voltage of the 5-Volt Supply circuit at the CKP Sensor harness connector. Is the voltage between 4.5 and 5.5 volts? If yes, go to next step. If no, repair the open or short to ground in the 5-Volt Supply circuit. Use Miller Special Tool (8815) when checking for an open circuit to prevent PCM harness connector terminal damage.
  5. Turn the ignition off. Disconnect the 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? If yes, repair or replace the Tone Wheel/Flex Plate as necessary. If no, go to next step.
    6. 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.
    NOTE: An intermittent glitch in the Camshaft Position Sensor can cause DTC P0339 to set.
  6. Turn the ignition off. With the DRBIII® lab scope probe and the Miller Special Tool (6801), backprobe the CMP Sensor Signal circuit at the CMP Sensor harness connector. Turn ignition on, engine not running. Wiggle the related wire harness and lightly tap on the CMP Sensor. Observe the lab scope screen. Start the engine. Observe the lab scope screen. Are there any irregular or missing signals? If yes, replace the CMP Sensor. If no, go to next step.
  7. There are no possible causes remaining, replace the Crankshaft Position Sensor.
    8. 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  8. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect CKP Sensor harness connector. Measure the resistance of the CKP Sensor Signal circuit from the CKP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 1.0 ohm? If yes, go to next step. If no, repair the open/high resistance in the CKP Sensor Signal circuit.
  9. Measure the resistance between ground and the CKP Sensor Signal circuit at the CKP Sensor harness connector. Wiggle the related wire harness while monitoring the resistance value. Does the resistance stay below 100 ohms? If yes, repair the short to ground in the CKP Sensor Signal circuit. If no, go to next step.
  10. Ensure the ignition is off. Reconnect PCM harness connectors. Turn ignition on, engine not running. Measure the voltage of the CKP Sensor Signal circuit at the CKP Sensor harness connector. Wiggle the related wire harness while taking measurement. Does the voltage ever increase above 5.5 volts? If yes, repair the short to battery voltage in the CKP Sensor Signal circuit. If no, go to next step.
  11. Turn the ignition off. Ensure the CKP Sensor is disconnected. Disconnect the PCM harness connectors. Measure the resistance between the CKP Sensor Signal circuit and the 5-Volt Supply circuit at the CKP Sensor harness connector. Is the resistance below 5.0 ohms? If yes, repair the CKP Sensor Signal circuit that is shorted to the 5-Volt Supply circuit. If no, go to next step.
    12. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  12. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    13. 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.
  13. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no test is complete.
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