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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Self Diagnostics - 4.7L) >> Diagnostic Tests >> DTC P0118: Engine Coolant Temperature Sensor Circuit High >> Testing

DTC P0118: Engine Coolant Temperature Sensor Circuit High: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition on, engine not running. With the DRBIII® scan tool, read the ECT sensor voltage. Is the voltage above 4.6 volts? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. 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.
    NOTE: Remove the jumper wire before continuing.
  3. Turn the ignition off. Disconnect the PCM sensor harness connectors. 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.
    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. 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. 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. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  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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