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DTC P0339: Crankshaft Position Sensor Intermittent: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, 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, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
    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® scan tool, read and record freeze frame Data specific to the CKP 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 (K24) CKP signal circuit at the sensor harness connector. 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 CKP sensor and the CMP sensor are properly installed and the mounting bolt(s) are tight. Refer to any TSBs 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 connector. Ignition on, engine not running. Measure the voltage on the (K6) 5-volt supply circuit. Is the voltage between 4.5-5.5 volts? If yes, go to next step. If no, repair the open or short to ground in the (K6) 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. Carefully disconnect the battery negative ground cable. Remove the CKP 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.
  6. An intermittent glitch in the CMP sensor can cause DTC P0339 to set. Turn the ignition off. With the DRBIII® lab scope probe and the Miller Special Tool (6801), backprobe the (K44) CMP signal circuit at the CMP sensor harness connector. 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, repair as necessary. If no, go to next step.
  7. If there are no possible causes remaining, replace the CKP 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. Install Miller Special Tool (8815) to perform diagnosis.
  8. Turn the ignition off. Disconnect the CKP sensor connector. Disconnect the PCM connector. Measure the resistance in the (K24) CKP signal circuit between the CKP harness connector and the appropriate terminal of Miller Special Tool (8815). Wiggle the wire harness while taking this measurement. Is the resistance below 1.0 ohm? If yes, go to next step. If no, repair the open/high resistance in the (K24) CKP signal circuit.
  9. Turn the ignition off. Disconnect the PCM connector. Disconnect the CKP sensor connector. Measure the resistance between ground and the (K24) CKP 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 (K24) CKP signal circuit. If no, go to next step.
  10. Turn the ignition off. Disconnect the CKP sensor connector. Reconnect the PCM harness connectors. Ignition on, engine not running. Measure the voltage on the (K24) CKP signal circuit. Wiggle the related wire harness while taking this measurement. Does the voltage ever increase above 5.5 volts? If yes, repair the short to B+ voltage in the (K24) CKP signal circuit. If no, go to next step.
  11. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the CKP sensor harness connector. Measure the resistance between the (K6) 5-volt supply circuit and the (K24) CKP signal circuit at the CKP sensor harness connector. Wiggle the related wire harness while taking this measurement. Is the resistance below 5.0 ohms? If yes, repair the short to the (K6) 5-volt supply circuit in the (K24) CKP signal circuit. If no, go to next step.
  12. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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