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DTC P0685: ASD Relay Control Circuit: Testing

  1. Turn the ignition on. With the DRBIII(R) scan tool, actuate the ASD relay. Is the ASD relay operating? If yes, go to next step. If no, go to step  3 .
  2. Turn the ignition on. With the DRBIII(R) scan tool, actuate the ASD relay. Wiggle the wiring harness from the ASD relay to the PCM while the relay is actuating. Did the ASD relay stop when wiggling the wiring harness? If yes, repair as necessary. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTICS SYSTEM.
    3. NOTE: Before continuing, inspect the ASD relay fuse located in the IPM. If the ASD relay fuse is open, repair the cause of the open first before continuing. Inspect the ASD relay output circuit for a short to ground for the cause of the open fuse.
  3. Turn the ignition off. Remove the ASD relay from the IPM. Turn the ignition on. Using a 12-volt test light connected to ground, probe the fused B+ circuit in the IPM. Does the test light illuminate? If yes, go to next step. If no, replace the IPM fuse and relay center.
  4. Turn the ignition off. Remove the ASD relay from the IPM. Turn the ignition on. Using a 12-volt test light connected to 12-volts, probe the ASD relay control circuit in the IPM. With the DRBIII(R) scan tool, actuate the ASD relay. Does the test light flash on and off? If yes, replace the ASD relay. If no, go to next step.
  5. Turn the ignition off. Disconnect the IPM C3 harness connector. Turn the ignition on. Using a 12-volt test light connected to 12-volts, probe the ASD relay control circuit in the IPM harness connector. With the DRBIII(R) scan tool, actuate the ASD relay. Does the test light flash on and off? If yes, replace the IPM fused and relay center. If no, go to next step.
  6. Turn the ignition off. Disconnect the IPM C3 harness connector. Disconnect the PCM harness connector. Measure the resistance of the ASD relay control circuit between the IPM C3 harness connector and the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the ASD relay control circuit for an open.
  7. Turn the ignition off. Disconnect the IPM C3 harness connector. Disconnect the PCM harness connector. Measure the resistance of the ASD relay control circuit in the IPM C3 harness connector to ground. Is the resistance less than 5.0 ohms? If yes, repair the ASD relay control circuit for a short to ground. If no, go to next step.
  8. Before continuing, disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. 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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