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DTC P0660: Manifold Tune Valve Solenoid Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, 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, go to step  9.
  2. Turn the ignition off. Disconnect the MTV Solenoid harness connector. Turn the ignition on. Using a 12-volt test light, connect one end to the ASD Relay Output circuit and the other end to the MTV Solenoid Control circuit at the MTV Solenoid harness connector. With the DRBIII®, actuate the MTV Solenoid. Does the 12-volt test light flash on and off. If yes, replace the MTV Solenoid. If no, go to next step.
  3. Ensure the MTV Solenoid is still actuated. Using a 12-volt test light connected to ground, probe the ASD Relay Output circuit in the MTV Solenoid harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, go to step  7.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between the MTV Solenoid Control circuit and ASD Relay Output circuit in the MTV Solenoid connector. Is the resistance below 5.0 ohms? If yes, repair the MTV Solenoid Control circuit for a short to the ASD Relay Output circuit. If no, go to next step.
  5. Measure the resistance between ground and the MTV Solenoid Control circuit at the MTV Solenoid harness connector. Is the resistance below 5.0 ohms? If yes, repair the short to ground in the MTV Solenoid Control 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  6. Measure the resistance of the MTV Solenoid Control circuit from the MTV Solenoid harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the MTV Solenoid Control circuit.
  7. Turn the ignition off. Reconnect the PCM harness connectors. Remove the ASD Relay from the PDC. Measure the resistance of the ASD Relay Output circuit between the ASD Relay connector in the PDC and the MTV Solenoid harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the ASD Relay Output circuit.
    8. NOTE: Repeat the following test for both Ignition Coil Capacitors. The Ignition Coil Capacitors are attached to the side of each valve cover.
  8. Turn the ignition off. Disconnect the Ignition Coil Capacitor harness connector. Install a good INJ/COIL fuse (fuse "S") in the PDC. With the DRBIII®, actuate the ASD Relay. Is the INJ/COIL fuse okay for both Ignition Coil Capacitor tests? If yes, replace the Ignition Coil Capacitor(s). If no, repair the ASD Output circuit for a short to ground.
    9. 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.
  9. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire 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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