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DTC P1388-A: Auto Shutdown Relay Control Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.
  1. Using scan tool, actuate Auto Shutdown (ASD) relay. Listen for clicking sound at ASD relay. ASD relay is located in Power Distribution Center (PDC) in engine compartment. If ASD relay is clicking, go to next step. If ASD relay is not clicking, go to step  5.
  2. Condition to set trouble code is not present at this time. AUTO SHUTDOWN RELAY CONTROL CIRCUIT DTC sets if an open or shorted condition is detected in ASD relay control circuit. Possible causes are: ASD relay coil open or shorted, fused ignition switch circuit open, ASD relay control circuit open or shorted, inoperative driver in Powertrain Control Module (PCM), PCM failure, faulty connections or wiring. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If related wiring and connectors were repaired, perform TEST VER-2A: ROAD TEST VERIFICATION .
  4. Start engine. Wiggle wiring harness from ASD relay to PCM. If engine stalled, repair wiring harness as necessary. Perform TEST VER-2A: ROAD TEST VERIFICATION . If engine did not stall, see INACTIVE TROUBLE CODE CONDITION  under SELF-DIAGNOSTICS. Test is complete. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  5. Disconnect ASD relay. Using a voltmeter, check voltage of both ASD relay connector fused B+ circuits. See ASD RELAY CONNECTOR WIRE IDENTIFICATION  table. See Fig 1. When checking fused B+ circuit, ensure circuit is tested at both terminals (one at a time) of ASD relay connector. ASD relay is located in underhood Power Distribution Center (PDC). See ASD RELAY CONNECTOR WIRE IDENTIFICATION  table. 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 VERIFICATION .
    Fig 1: ASD Relay Terminals & Location
    G98E00145Courtesy of CHRYSLER CORP.
  6. Using an ohmmeter, check resistance between ASD relay terminals No. 85 and 86. See Fig 2. 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 VERIFICATION .
    Fig 2: Testing Relay
    G94C31759Courtesy of CHRYSLER CORP.
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using an ohmmeter, check resistance of ASD relay control circuit at ASD relay connector. See ASD RELAY CONNECTOR WIRE IDENTIFICATION  table for wire identification. 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. Perform TEST VER-2A: ROAD TEST VERIFICATION .
  8. Using an ohmmeter, measure resistance of ASD relay control circuit between ASD relay connector and PCM connector. See ASD RELAY CONNECTOR WIRE IDENTIFICATION  table and PCM CONNECTOR WIRE IDENTIFICATION  table for wire identification. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, repair open ASD relay control circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
ASD RELAY CONNECTOR WIRE IDENTIFICATION

Application Wire Color
ASD Relay B+ Circuit
Terminals A & B Red/White
ASD Relay Control Circuit
Terminal C Dark Blue/Yellow
ASD Relay Output Circuit
Terminal D Dark Green/Orange
PCM CONNECTOR WIRE IDENTIFICATION

Application Wire Color
PCM Terminal No. 67
ASD Relay Control Circuit Dark Blue/Yellow
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