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DTC P0685: ASD Relay Control Circuit: Testing

  1. Turn the ignition on, with the engine off. With the DRBIII(R), actuate the ASD Relay. Is the ASD Relay operating? If yes, see INTERMITTENT FAILURES  under ON-BOARD DIAGNOSTICS. If no, go to next step.
  2. Turn the ignition off. Remove the ASD Relay from the Power Distribution Center (PDC). Turn the ignition on, with the engine off. Using a 12-volt test light connected to ground, probe the Fused B+ circuits in the PDC. Does the test light illuminate brightly? If yes, go to next step. If no, repair the Fused B+ circuit as necessary. Inspect the related fuse(s) and replace if necessary.
  3. Turn the ignition off. Measure the resistance of the ASD Relay Coil (component side). Is the resistance 60-80 ohms? If yes, go to next step. If no, replace the ASD Relay.
    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. Disconnect the PCM harness connectors. Measure the resistance of the ASD Relay Control circuit from the PDC to the appropriate terminal of the Miller Special Tool. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the ASD Relay Control circuit.
    5. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push-out. Repair as necessary.
  5. There are no possible causes remaining, replace the PCM.
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