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Home >> Dodge and Ram >> 2003 >> Durango Base, 4.7 N, 4WD, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 4.7L >> Diagnostic Tests >> DTC P0685: ASD Relay Control Circuit >> Testing

DTC P0685: ASD Relay Control Circuit: Testing

  1. Ignition on, engine not running. With the DRBIII® scan tool, actuate the ASD relay. Is the ASD relay operating? If yes, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM. If no, go to next step.
  2. Turn the ignition off. Remove the ASD relay from the PDC. Using a 12-volt test light connected to ground, probe the (A16) fused B+ circuits in the PDC. Does the test light illuminate brightly? If yes, go to next step. If no, repair the open or short to ground in the (A16) fused B+ circuits. inspect and replace any open fuses.
  3. Measure the resistance of the ASD relay coil. Is the resistance 60-80 ohms? If yes, go to next step. If no, replace the ASD relay.
    4. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  4. Disconnect the PCM harness connectors. Measure the resistance of the (K51) ASD relay control circuit from the PDC to the appropriate terminal of the Miller Special Tool (8815). Is the resistance below 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 in the PDC. Is the resistance below 5.0 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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