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DTC P0688: ASD Relay Sense Circuit Low: Testing

    NOTE: If DTC P0685 is also set with DTC P0688, diagnose DTC before continuing. See DTC P0685: ASD RELAY CONTROL CIRCUIT .
  1. With the DRBIII®, erase 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. With the DRBIII®, read DTCs. Does the DTC reset? If yes, go to next step. If no, go to step  9.
  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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  3. Turn the ignition off. Remove the ASD relay from the PDC. Disconnect the PCM harness connectors. Measure the resistance of the ASD Relay Output circuit from the ASD Relay cavity in PDC 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 ASD Relay Output circuit.
    4. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  4. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  5. With the DRBIII®, erase DTC. Install a substitute relay for the Auto Shutdown Relay. Attempt to start the vehicle. With the DRBIII®, read DTCs. Does the DTC reset? If yes, go to next step. If no, replace the original ASD Relay.
  6. Turn the ignition off. Remove ASD Relay from the PDC. Measure the Fused B+ circuit at the ASD Relay harness connector in the PDC. Is the voltage above 11.0 volts? If yes, go to next step. If no, repair the 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  7. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the ASD Relay Output circuit from the ASD Relay cavity in PDC 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 ASD Relay Output circuit.
    8. NOTE: Before continuing, check the PCM harness connectors for corrosion, damage or terminal push out. Repair as necessary.
  8. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    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. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was 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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