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DTC P0118: Engine Coolant Temperature Sensor High: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, monitor ECT sensor voltage. Is the voltage above 4.9 volts? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the ECT sensor harness connector. Ignition on, engine not running. Measure the voltage of the (K2) ECT signal circuit at the ECT sensor harness connector. Is the voltage above 5.2 volts? If yes, repair the ECT sensor signal circuit for a short to battery voltage. If no, go to next step.
  3. Turn the ignition off. Disconnect the ECT harness connector. Connect a jumper wire between the (K2) ECT signal circuit and the (K4) sensor ground circuit in the ECT harness connector. Turn the ignition on, engine not running. With the DRBIII® scan tool, read the ECT voltage. Is the voltage below 1.0 volt? If yes, replace the ECT sensor. 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 ECT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K2) ECT signal circuit from the ECT 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 ECT signal circuit for an open.
    5. 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.
  5. Turn the ignition off. Disconnect the ECT sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K4) sensor ground circuit from the ECT 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 (K4) sensor ground circuit for an open.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. 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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