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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 an open or shorted condition is detected in the ASD relay control circuit. Possible causes are: defective ASD relay, defective PCM, or defective connectors or wiring.
  1. Turn ignition on with engine off. Using scan tool, actuate Auto Shutdown (ASD) relay. Listen for clicking sound at ASD relay. ASD relay is located in Power Distribution Center (PDC) at driver's side rear corner of engine compartment. See Fig 1. If clicking sound is heard at ASD relay, go to next step. If no clicking sound is heard at ASD relay, go to step  6.
    Fig 1: Locating Relays & Identifying Power Distribution Center (PDC) Cavities
    G00014422Courtesy of DAIMLERCHRYSLER CORPORATION
  2. Turn ignition off. Remove ASD relay from PDC. Disconnect PCM connectors. Note cavity identification for ASD relay in PDC. See Fig 1. Using ohmmeter, check resistance between ASD relay cavity No. 38 (Dark Blue/Yellow wire) in PDC and PCM connector terminal No. 67 (Dark Blue/Yellow wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open circuit on Dark Blue/Yellow wire between PCM and PDC. Perform TEST VER-2A .
  3. Using voltmeter, check voltage at cavities No. 34 and 35 (fused B+ circuits) in PDC. If voltage is more than 10 volts at both cavities, go to next step. If voltage is 10 volts or less at either cavity, repair appropriate open circuit from battery to fuse No. 21 and ASD relay cavities No. 34 and 35. Fuse No. 21 is located in PDC. Perform TEST VER-2A .
  4. Ensure ASD relay is removed from PDC. Using ohmmeter, check resistance between ground and PCM connector terminal No. 67 (Dark Blue/Yellow wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on Dark Blue/Yellow wire between PCM and ASD relay. Perform TEST VER-2A .
  5. Note which terminals on ASD clutch relay corresponds with cavities in PDC. See Fig 1. Using ohmmeter, check resistance between terminals on ASD relay that correspond with cavities No. 35 and 38 in PDC. If resistance is 50-90 ohms, replace PCM. Perform TEST VER-2A . If resistance is not 50-90 ohms, replace ASD relay. Perform TEST VER-2A .
  6. Inspect wiring and connectors between ASD relay and PCM. Inspect related wiring harnesses and connectors. Refer to Technical Service Bulletins (TSBs) for related problems. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-2A .
  7. Turn ignition off. Remove ASD relay from PDC. Using voltmeter, check voltage at cavities No. 34 and 35 (fused B+ circuits) in PDC. If voltage is more than 10 volts at both cavities, test is complete. If voltage is 10 volts or less at either cavity, repair appropriate open circuit from battery to fuse No. 21 and ASD relay cavities No. 34 and 35. Fuse No. 21 is located in PDC. Perform TEST VER-2A .
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