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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 5.9L >> Diagnostic Tests >> DTC P1388: Auto Shutdown Relay Control Circuit >> Testing
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DTC P1388: Auto Shutdown Relay Control Circuit: Testing

  1. Turn ignition on, with engine off. With the DRBIII® scan tool, read the DTCs and record the related freeze frame data. Is the DTC Specific Good Trip Counter displayed and equal to zero? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Remove the ASD relay from the Power Distribution Center (PDC). Measure the resistance between terminals 85 and 86 of the ASD relay (component side). Is the resistance 50-80 ohms? If yes, go to next step. If no, replace the ASD relay.
  3. Measure the voltage on the (A16) fused B+ circuit at the ASD relay connector. Is the voltage more than 10.0 volts? If yes, go to next step. If no, repair the open in the fused ignition output circuit.
  4. Disconnect the PCM harness connectors. Measure the resistance of the (K51) ASD relay control circuit from the ASD relay cavity in the PDC to the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the open in the (K51) ASD relay control circuit.
  5. Measure the resistance between ground and the (K51) ASD relay control circuit. Is the resistance less than 100 ohms? If yes, repair the short to ground in the (K51) ASD relay control circuit. If no, go to next step.
    6. NOTE: Before continuing, disconnect the PCM harness connectors and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary.
  6. Using the wiring diagram as a guide, inspect the wire harness and connectors. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect both the component and the PCM connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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