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DTC P1686: No Skim Bus Messages: Testing

  1. Turn the ignition on. With the DRBIII® scan tool, read the PCM DTCs. Is the Starts Since Set counter on the DTC screen for P1686 equal to 0? If yes, go to next step. If no, go to step  5.
    2. NOTE: This test will indicate if the Bus is operational from the DLC to the SKIM.
  2. Turn the ignition on. With the DRBIII® scan tool, attempt to communicate with the SKIM. Was the DRBIII® scan tool able to communicate with the SKIM? If yes, go to next step. If no, diagnose communication fault. See BUS +/- SIGNAL OPEN FROM SKIM under COMMUNICATIONS under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT.
    3. 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.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the SKIM harness connector. 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. Turn the ignition off. Replace the Sentry Key Immobilizer Module. See REMOVAL & INSTALLATION in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. Turn the ignition on. 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® scan tool, display PCM DTCs. Does the DRBIII® scan tool display the same DTC? If yes, replace PCM. Program the new PCM. See PROGRAMMING . If no, test is complete.
    5. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  5. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® scan tool parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® scan tool freeze frame information. If possible try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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