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DTC P0325: Knock Sensor #1 Circuit: 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. Turn the ignition off. Disconnect the knock sensor harness connector. Measure the voltage of the (K42) knock sensor signal circuit in the knock sensor harness connector. Is the voltage above 2.0 volts? If yes, repair the (K42) knock sensor signal circuit for a short to voltage. If no, go to next step.
  3. Turn the ignition off. Disconnect the knock sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K42) knock sensor signal circuit in the knock sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the knock sensor signal circuit for a short to ground. If no, go to next step.
    4. 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.
  4. Turn the ignition off. Disconnect the knock sensor harness connector. Disconnect the PCM harness connectors. Measure resistance of the (K42) knock sensor signal circuit between the knock sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K42) knock sensor signal circuit for an open.
  5. Turn the ignition off. Disconnect the knock sensor harness connector. Measure the resistance between the (K42) knock sensor signal circuit and the knock sensor return circuit harness connector. Is the resistance below 100 ohms? If yes, repair the (K42) knock sensor signal circuit for a short to the knock sensor return circuit. If no, go to next step.
    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. Install Miller Special Tool (8815) to perform diagnosis.
  6. Turn the ignition off. Disconnect the knock sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K45) knock sensor return circuit between the knock sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the (K45) knock sensor signal circuit for an open.
  7. Turn the ignition off. Replace knock sensor. Turn ignition on. With the DRBIII® scan tool, erase DTC. Attempt to operate vehicle using information noted in freeze frame data. With the DRBIII® scan tool, read DTCs. Does the DRBIII® scan tool display the DTC that was previously erased? If yes, 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 . If no, test is complete.
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