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DTC P1388: Auto Shutdown Relay Control Circuit: Testing

  1. Turn ignition on. Using scan tool, actuate ASD relay. Listen for clicking sound at ASD relay. ASD relay is located in Power Distribution Center (PDC) in engine compartment. See Figure . If ASD relay is not clicking, go to next step. If ASD relay is clicking, go to step  7 .
  2. Turn ignition off. Remove ASD relay from PDC. Disconnect PCM harness connectors. See Figure . Measure resistance of ASD relay control circuit (Dark Blue/Yellow wire) between terminal No. 2 at ASD relay harness connector and terminal No. 67 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Dark Blue/Yellow wire.
  3. Measure voltage between ground and fused battery voltage circuits (Red/White wires) at ASD relay harness connector terminals No. 4 and 5. See Figure . If voltage is more than 10 volts on both circuits, go to next step. If voltage is 10 volts or less on either circuit, repair open in fused battery voltage circuit.
  4. Measure resistance between ground and ASD relay control circuit (Dark Blue/Yellow wire) at ASD relay harness connector terminal No. 2. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in ASD relay control circuit.
  5. Measure resistance between ASD relay terminals No. 2 and 4 (component side). If resistance is 50-90 ohms, go to next step. If resistance is not 50-90 ohms, replace ASD relay.
  6. If no other possible causes are remaining, replace PCM.
  7. Conditions that set DTC are not present at this time. Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires. Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals. Refer to any Technical Service Bulletins (TSBs) that may apply. Perform a wiggle test on related wiring harnesses with engine running. Watch for GOOD TRIP counter to change to zero. If a problem is found, repair as necessary. If no problems are found, test is complete.
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