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DTC P1686: No Skim Bus Messages: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read the PCM DTCs. Is the Starts Since Set counter on the DTC screen equal to zero? If yes, go to next step. If no, go to step  5.
  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. 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. Use Miller Special Tool (8815) when performing diagnosis at PCM harness connectors.
  3. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the SKIM harness connector. Measure the resistance of the PCI Bus circuit from the PCM harness connector to the appropriate terminal of the Miller Special Tool. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the PCI Bus circuit between the PCM and the SKIM.
  4. Ensure the ignition is off. Replace the Sentry Key Immobilizer Module. 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®, display PCM DTCs. Does the DRBIII® display the same DTC? If yes, replace and program the 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 and at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DTC When Monitored and Set Conditions. 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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