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DTC P1698: No Bus Message From Trans Control Module: Testing

  1. Turn the ignition on. With the DRBIII(R), erase DTCs. Cycle the ignition key off and on several times, leaving the ignition on for at least 20 seconds each time. Turn the ignition on. With the DRBIII(R), read DTCs. Does the DTC reset? If yes, go to next step. If no, go to step  3 .
  2. With the DRBIII(R), attempt to communicate with the TCM. Can communication be established with the TCM? If yes, replace PCM. If no, perform the appropriate symptom-related test. See appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
    3. 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.
  3. Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
    • With the engine running at normal operating temperature, monitor the DRBIII(R) 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(R) Freeze Frame information to identify under what conditions the DTC set.
    • Refer to any Technical Service Bulletin (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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