P1652

Test 1 - 3:

Test 4:

SYMPTOM
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 Control Modules, bus communication between the modules is internal.

POSSIBLE CAUSES
- Engine communication DTCs present
- Powertrain control module
- Intermittent wiring and connectors