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DTC P1388: ASD Relay Control Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAMS article.
NOTE: Monitored with engine running and battery voltage more than 10 volts. Set condition is when an open or shorted condition is detected in ASD relay control circuit. Possible causes are: ASD relay fused B+ circuit open, ASD relay resistance more than 100 ohms, ASD relay control circuit open, intermittent wiring harness failure, ASD relay control circuit short to ground or PCM defective.
  1. Turn ignition on with engine off. Using scan tool, actuate ASD relay. ASD relay is located in Power Distribution Center (PDC) at driver's side front corner of engine compartment, just in front of strut tower. If ASD relay is clicking, go to next step. If ASD relay is not clicking, go to step  4 .
  2. Start engine. Wiggle wiring harness between ASD relay connector and Powertrain Control Module (PCM) connector C1 (located nearest to front of vehicle). PCM is located to left of Power Distribution Center (PDC) in engine compartment. If engine did not stall while wiggling wires, go to next step. If engine stalled while wiggling wires, repair wiring harness as necessary where problem appeared. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  3. Turn ignition off. Inspect wiring and connectors for damage. If wiring and connectors are okay, test is complete. If wiring and connectors are not okay, repair or replace as necessary. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  4. Turn ignition off. Disconnect ASD relay. Inspect electrical connector and clean/repair as necessary. Turn ignition on with engine off. Using a DVOM, check voltage of ASD relay connector terminal No. 91 fused B+ circuit (Red/Tan wire) and terminal No. 97 fused B+ (Red/Tan wire) one at a time. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open fused B+ circuit. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  5. Turn ignition off. Using a DVOM, check resistance between ASD relay terminals. See Fig 1 . If resistance is less than 100 ohms, go to next step. If resistance is 100 ohms or more, replace ASD relay. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
    Fig 1: Testing Relay
    G94C31759Courtesy of CHRYSLER CORP.
  6. Disconnect Powertrain Control Module (PCM) connector C2 (located nearest to rear of vehicle). PCM is located to left of Power Distribution Center (PDC) in engine compartment. Inspect electrical connector and clean/repair as necessary. Using a DVOM, check resistance of ASD relay control circuit between ASD relay connector terminal No. 93 (Dark Blue/Violet wire) and PCM connector C2 terminal No. 67 (Dark Blue/Violet wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open ASD relay control circuit. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  7. Using a DVOM, check resistance of ASD relay control circuit between PCM connector C2 terminal No. 67 (Dark Blue/Violet wire) and chassis ground. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair ASD relay control circuit short to ground. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
  8. Turn ignition off. If no other potential causes are remaining, PCM is assumed to be defective. Replace PCM. Perform TEST VER-2A: ROAD TEST FOR NON-OBD II  .
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