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DTC P1681: No Fuel Level Bus Message: Testing

  1. Turn the ignition on. With the DRBIII® scan tool, erase DTCs. Start the engine on and off several times. Leave the engine running for at least 20 seconds each time. With the DRBIII® scan tool, read DTCs. Does the DTC reset? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Ignition on, engine not running. With the DRBIII® scan tool, attempt to communicate with the BCM. Can communication be established with the BCM? If yes, go to next step. If no, refer to the COMMUNICATIONS under SYSTEM TESTS in appropriate BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT perform the appropriate symptom related to no communication with BCM.
  3. Turn the ignition on. Using the DRBIII® scan tool, read the fuel level parameter in the PCM. Does the DRBIII® scan tool display a fuel level value? If yes, replace and program the PCM. See PROGRAMMING . If no, go to next step.
    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. Turn the ignition off. Disconnect the PCM harness connectors. Disconnect the BCM harness connector. Measure the resistance of the PCI bus circuit from the BCM harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, replace BCM see appropriate REMOVAL & INSTALLATION in BODY CONTROL MODULES article in ACCESSORIES & EQUIPMENT. If no, repair the PCI Bus circuit between the PCM and the BCM for an open.
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