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DTC P0688: ASD Relay Sense Circuit Low: Testing

  1. If DTC P0685 Auto Shutdown Relay Control Circuit is set along with this DTC, diagnose DTC P0685: ASD RELAY CONTROL CIRCUIT  first. With the DRBIII® scan tool, erase the DTC. Attempt to start the engine. If the engine will not start, crank the engine for at least 15 seconds. It may be necessary to repeat several times. Does the DTC reset? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Attempt to start the engine. Does the engine start. If yes, go to next step. If no, go to step  5.
    3. 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.
  3. Turn the ignition off. Remove the ASD relay from the PDC. Disconnect the PCM harness connectors. Measure the resistance of the (K25) ASD output circuit from the PDC 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 (K25) ASD relay output circuit.
  4. 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 .
  5. Turn the ignition off. Install a substitute relay in place of the ASD relay. Ignition on, engine not running. With the DRBIII® scan tool, erase DTCs. Attempt to start the engine. With the DRBIII® scan tool, read DTCs. Does the DTC reset? If yes, go to next step. If no, replace the ASD relay.
  6. Turn the ignition off. Remove the ASD relay from the PDC. Measure the voltage of the (A14) fused B+ circuit in the PDC. Is the voltage above 11.0 volts? If yes, go to next step. If no, repair the (A14) fused B+ circuit. Inspect the related fuse and repair as necessary.
    7. 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.
  7. Turn the ignition off. Remove the ASD relay from the PDC. Disconnect the PCM harness connectors. Measure the resistance of the ASD output circuit from the PDC to the each of the ASD relay output circuits at 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 ASD relay output circuit(s).
  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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