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DTC P1686: No Skim Bus Message Received: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read the PCM DTCs. Is the Good Trip Counter on the DTC screen equal to zero? If yes, go to next step. If no, go to INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. With the DRBIII®, attempt to communicate with the SKIM. This test will indicate if the bus is operational from the DLC to the SKIM. Was the DRBIII® able to communicate with the SKIM? If yes, go to next step. If no, check for open bus circuits from SKIM. See COMMUNICATIONS under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the SKIM harness connector. SKIM is located under left side of instrument panel. Measure the resistance of the PCI Bus circuit between the PCM harness connector and the SKIM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the PCI Bus circuit between the PCM and the SKIM for an open.
  4. Ensure ignition is off. Replace SKIM and program new SKIM. See REMOVAL & INSTALLATION in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. Turn ignition on, engine not running. Display and erase all PCM and SKIM DTCs. Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle. With the DRBIII®, display PCM DTCs. Does the DRBIII® display the same DTC? If yes, replace PCM. Program the new PCM. See PROGRAMMING . If no, test is complete.
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