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DTC P1388: Auto Shutdown Relay Control Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Auto Shutdown (ASD) relay operation is monitored when ignition is on and battery voltage is more than 10 volts. DTC may be stored in Powertrain Control Module (PCM) if PCM detects an open or shorted condition in ASD relay control circuit. Possible causes are: defective ASD relay circuit, defective ASD relay, defective PCM, or defective connectors or wiring.
  1. Turn ignition on with engine off. Using scan tool, actuate ASD relay. Listen for clicking sound at ASD relay. ASD relay is located in power distribution center at driver's side front corner of engine compartment, near battery. See Figure . If clicking sound is heard at ASD relay, go to next step. If no clicking sound is heard at ASD relay, go to step  4 .
  2. Start engine and allow engine to idle. Wiggle wiring harness and connectors b etween ASD relay and PCM. PCM is located between driver's side front fender and power distribution center, near battery. If engine does not stall while wiggling wiring harness and connectors, go to next step. If engine stalls while wiggling wiring harness and connectors, repair wiring or connectors as necessary that caused engine to stall. Perform TEST VER-2A  .
  3. Turn ignition off. Inspect wiring harness and connectors between ASD relay and PCM. If no problems exist, test is complete. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A  .
  4. Turn ignition off. Remove ASD relay from power distribution center. Note cavities in power distribution center for ASD relay. See Figure . Using voltmeter, check voltage at cavity No. 86 (Red wire) in power distribution center for ASD relay. This is B+ circuit to ASD relay and supplies battery voltage to ASD relay. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open on Red wire between battery, power distribution center and ASD relay. Perform TEST VER-2A  .
  5. Note which terminals on ASD relay correspond with cavities in power distribution center. See Figure . Using ohmmeter, check resistance between terminals on ASD relay that correspond with cavities No. 85 and 86 in power distribution center. If resistance is 50-90 ohms, go to next step. If resistance is not 50-90 ohms, replace ASD relay. Perform TEST VER-2A  .
  6. Ensure ignition is off and ASD relay is removed from power distribution center. Disconnect PCM connectors. PCM is located between driver's side front fender and power distribution center, near battery.
  7. Note cavities in power distribution center for ASD relay. See Figure . Using ohmmeter, check resistance between cavity No. 85 (Dark Blue/Yellow wire) in power distribution center for ASD relay and terminal No. 67 (Dark Blue/Yellow wire) on Gray PCM connector C2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Dark Blue/Yellow wire between PCM and cavity No. 85 in power distribution center for ASD relay. Perform TEST VER-2A  .
  8. Ensure ASD relay is removed from power distribution center. Using ohmmeter, check resistance between ground and terminal No. 67 (Dark Blue/Yellow wire) on Gray PCM connector C2. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-2A  . If resistance is less than 5 ohms, repair short to ground on Dark Blue/Yellow wire between PCM and cavity No. 85 in power distribution center for ASD relay. Perform TEST VER-2A  .
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