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DTC P1388: Auto Shutdown Relay Control Circuit: Testing

  1. Turn the ignition on. With the DRBIII®, actuate the ASD Relay. Is the ASD Relay operating? If yes, go to next step. If no, go to step  4.
  2. With the DRBIII®, 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, go to next step.
  3. 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 wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring 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.
  4. Turn the ignition off. Remove the ASD Relay from the PDC. Turn the ignition on. Measure the voltage of the Fused B+ circuit in the PDC. Is the voltage above 11.0 volts? If yes, go to next step. If no, repair the Fused B+ circuit. Check and replace any open fuses.
  5. Turn the ignition off. Measure the resistance of the ASD Relay between the Fused B+ terminal and the ASD Relay Control terminal. Is the resistance between 60 to 80 ohms? If yes, go to next step. If no, replace the ASD Relay.
  6. Turn the ignition off. Remove the ASD Relay from the PDC. Disconnect the PCM C2 harness connector. Measure the resistance of the ASD Control circuit between the PDC and the PCM C2 harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the ASD Relay Control circuit for an open.
  7. Measure the resistance of the ASD Relay Control circuit in the PDC to ground. Is the resistance below 5.0 ohms? If yes, repair the ASD Relay Control circuit for a short to ground. If no, go to next step.
  8. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
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