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Symptom: P1652-SERIAL COMMUNICATION LINK MALFUNCTION When Monitored and Set Condition: P1652-SERIAL COMMUNICATION LINK MALFUNCTION When Monitored: Continuously with engine running. Set Condition: The DTC sets in approximately 20 seconds if no BUS messages are received by the TCM. Note: Due to the integration of the Powertrain and Transmission POSSIBLE CAUSES ENGINE COMMUNICATION DTCS PRESENT POWERTRAIN CONTROL MODULE INTERMITTENT WIRING AND CONNECTORS TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, read Engine DTC’s. Are there any Engine Communication DTC’s present? All Yes → Refer to the Powertrain category and perform the appropriate symptom. No → Go To 2 2 With the DRBIII t, erase Transmission DTC’s. Start the Engine in Park. t, read Transmission DTCs. NOTE: The Engine must run for at least 20 seconds to reset this DTC. All Yes → Go To 3 No → Go To 4 3 Using the schematics as a guide, inspect the wiring and connectors. Repair as All Repair Replace the Powertrain Control Module. WITH THE DRBIII t PERFORM QUICK LEARN AND REPROGRAM PINION FAC- 150 TRANSMISSION - NGC |