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DTC P0243: WASTEGATE Solenoid Circuit: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, read PCM DTCs and record the related freeze frame data. Is the Good Trip 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 wastegate solenoid harness connector. Using a 12-volt test light, jumper across the wastegate solenoid harness connector. While actuating the solenoid wiggle the related wiring harness. With the DRBIII® scan tool, actuate the wastegate solenoid. Does the test light illuminate brightly and flash on and off? If yes, replace the wastegate solenoid. If no, go to next step.
  3. Turn the ignition, off. Disconnect the wastegate solenoid harness connector. Using a 12-volt test light connected to battery voltage, probe the (Z1) ground circuit in the wastegate harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the (Z1) ground circuit for an open.
    4. NOTE: The wastegate solenoid control circuit is a high side control circuit. When the circuit is operating normally voltage will be present.
  4. Turn the ignition off. Disconnect the wastegate solenoid harness connector. Disconnect the PCM harness connectors. Turn the ignition on. Measure the voltage of the (K137) wastegate solenoid control circuit in the wastegate solenoid harness connector. Does the voltmeter indicate any voltage present? If yes, repair the short to voltage in the (K137) wastegate solenoid control circuit. If no, go to next step.
    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 wastegate solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K137) wastegate solenoid control circuit from the wastegate solenoid 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 open in the (K137) wastegate solenoid control circuit.
  6. Turn the ignition off. Disconnect the wastegate solenoid harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K137) wastegate solenoid control circuit at the wastegate solenoid harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K137) wastegate solenoid control circuit. If no, go to next step.
  7. Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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