P1652

Symptom: P1652-SERIAL COMMUNICATION LINK MALFUNCTION

When Monitored and Set Condition:

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 Control Modules, bus communication between the modules is internal.

POSSIBLE CAUSES
- ENGINE COMMUNICATION DTCS PRESENT
- POWERTRAIN CONTROL MODULE
- INTERMITTENT WIRING AND CONNECTORS

Test 1 - Test 3:

Test 4: