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Symptom: P1687-NO COMMUNICATION WITH THE MIC When Monitored and Set Condition: P1687-NO COMMUNICATION WITH THE MIC When Monitored: Continuously with engine running. Set Condition: The code sets in approximately 25 seconds if no BUS messages are received from the MIC. POSSIBLE CAUSES OTHER BUS PROBLEMS PRESENT INTERMITTENT WIRING AND CONNECTORS MIC - NO COMMUNICATION TRANSMISSION CONTROL MODULE TEST ACTION APPLICABILITY 1 With the DRBIII t, Check the STARTS SINCE SET counter for P1687. Note: This counter only applies to the last DTC set. All Yes → Go To 2 No → Go To 5 2 With the DRBIII t, check all of the other modules on the vehicle for evidence of a vehicle bus problem. 9No Bus9 or is there any evidence of an overall vehicle bus problem? All Yes → Refer to the Communications category and perform the appropri- ate symptom. No → Go To 3 3 Ignition on, engine not running. t, clear all DTC’s. Start the engine in park. t, read the MIC DTC’s. Can the DRBIII t communicate with the MIC? All Yes → Go To 4 No → Refer to the Communication category and perform the appropri- ate symptom related to No Response to MIC. 405 TRANSMISSION - 42RLE |