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DTC P0340: Camshaft Position Sensor Circuit: Testing

  1. With the DRBIII®, read the Current CMP Sensor State while cranking the engine. Does the DRBIII® display Current CMP State Present while cranking the engine? If yes, go to next step. If no, go to step  4.
    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. Turn ignition on, engine not running. Locate CKP Sensor. With the DRBIII® lab scope probe and the Miller Special Tool (6801), backprobe the CKP Sensor Signal circuit in the Crankshaft Sensor harness connector. Wiggle the related wire harness and connections. Monitor the lab scope screen. Start the engine. Lightly tap on the Crankshaft Sensor and wiggle the CKP Sensor connector. Observe the lab scope screen. Look for any erratic pulses generated by the CKP Sensor. Did the CKP Sensor generate any erratic pulses? If yes, carefully inspect the wiring harness and connections, repair as necessary. If okay, replace the Crankshaft Position Sensor. If no, go to next step.
  3. Turn the ignition off. With the DRBIII® lab scope probe and the Miller Special Tool (6801), backprobe the CMP Sensor Signal circuit in the CMP Sensor harness connector. Wiggle the related wire harness and connections. Look for any pulses generated by the CMP Sensor while wiggling the harness and connectors. Start the engine. Observe the lab scope screen. Wiggle the related wire harness and connections. Look for any erratic pulses generated by the CMP Sensor. Did the CMP Sensor generate any irregular pulses in either of the above tests? If yes, check the wiring and connections that may cause the intermittent condition. If okay, replace the Camshaft Position Sensor. If no, test is complete.
  4. Turn the ignition off. Disconnect the CMP Sensor harness connector. Turn ignition on, engine not running. Measure the voltage on the 5-Volt Supply circuit at the CMP Sensor harness connector. Is the voltage between 4.5 and 5.5 volts? If yes, go to next step. If no, go to step  13.
  5. Measure the voltage on the CMP Sensor Signal circuit at the CMP Sensor harness connector. Is the voltage between 4.5 and 5.0 volts? If yes, go to next step. If no, go to step  8.
    6. 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.
  6. Turn the ignition off. Ensure the CMP Sensor is disconnected. Disconnect the PCM harness connectors. Measure the resistance of the Sensor Ground circuit from the CMP Sensor harness connector to the appropriate terminal at Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the Sensor Ground circuit.
    7. NOTE: Inspect the Camshaft sprocket for damage. If a problem is found, repair as necessary.
  7. There are no possible causes remaining, replace the Camshaft Position Sensor.
  8. Ensure the ignition is off. Disconnect PCM harness connectors. Measure the resistance between ground and the CMP Sensor Signal circuit at the CMP Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the CMP Sensor Signal circuit. If no, go to next step.
    9. 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.
  9. Measure the resistance of the CMP Sensor Signal circuit from the CMP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the CMP Sensor Signal circuit.
  10. Ensure the ignition is off. Reconnect PCM harness connectors. Turn ignition on, engine not running. Measure the voltage of the CMP Sensor Signal circuit at the CMP Sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the short to battery voltage in the CMP Sensor Signal circuit. If no, go to next step.
  11. Ensure the ignition is off. Disconnect the PCM harness connectors. Measure the resistance between the CMP Sensor Signal circuit and the 5-Volt Supply circuit at the CMP Sensor harness connector. Is the resistance below 5.0 ohms? If yes, repair the CMP 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. Turn the ignition off. Disconnect the PCM harness connectors. Ensure the CMP Sensor is disconnected. Measure the resistance between ground and the 5-Volt Supply circuit at the CMP Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the 5-Volt Supply circuit. If no, go to next step.
    14. 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.
  14. Measure the resistance of the 5-Volt Supply circuit from the CMP Sensor harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the 5-Volt Supply circuit.
  15. Ensure the ignition is off. Reconnect PCM harness connectors. Turn ignition on, engine not running. Measure the voltage of the 5-Volt Supply circuit at the CMP Sensor harness connector. Is the voltage above 5.5 volts? If yes, repair the short to battery voltage in the 5-Volt Supply circuit. If no, go to next step.
    16. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  16. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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