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DTC P1289: Manifold Tune Valve Control Circuit: Testing

  1. Turn the ignition on. With the DRBIII(R), read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  11 .
  2. Turn the ignition off. Disconnect the MTV solenoid harness connector. Turn the ignition on. Using a 12-volt test light connected to ground, probe the MTV relay output circuit in the MTV solenoid harness connector. With the DRBIII(R), actuate the MTV relay. Does the 12-volt test light illuminate brightly? If no, go to next step. If yes, go to step  10 .
  3. Turn the ignition off. Remove the MTV relay from the Power Distribution Center (PDC). Measure the resistance of the MTV relay output circuit between the PDC and the MTV solenoid harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the MTV relay output circuit for an open.
  4. Reconnect the MTV solenoid harness connector. Using a 12-volt test light connected to ground, probe the fused B+ circuit in the PDC. Does the test light illuminate brightly? If yes, go to next step. If no, repair the fused B+ circuit as necessary.
  5. Using a 12-volt test light connected to ground, probe the ASD relay output circuit in the PDC. Turn the ignition on. With the DRBIII(R), actuate the MTV relay. Does the test light illuminate brightly? If yes, go to next step. If no, repair the ASD relay output circuit as necessary.
  6. Using a 12-volt test light connected to battery voltage, probe the MTV relay control circuit in the PDC. With the DRBIII(R), actuate the MTV relay. Does the 12-volt test light flash on and off? If no, go to next step. If yes, replace the MTV relay.
  7. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the MTV relay control circuit between ground and the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, repair the MTV relay control circuit for a short to ground. If no, go to next step.
  8. Measure the resistance of the MTV relay control circuit between the PDC and the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the MTV relay control circuit for an open.
  9. There are no possible causes remaining, replace PCM.
  10. Turn the ignition off. Using a 12-volt test light connected to battery voltage, probe the ground circuit in the MTV solenoid harness connector. Does the test light illuminate brightly? If yes, replace the MTV solenoid. If no, repair the ground circuit for an open.
    11. 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.
  11. Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
    • With the engine running at normal operating temperature, monitor the DRBIII(R) parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.
    • Review the DRBIII(R) Freeze Frame information to identify under what conditions the DTC set.
    • Refer to any Technical Service Bulletin (TSB) that may apply.
    • Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
    • Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.

      Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.

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