0003

0003-CAN COMMUNICATION ERROR





For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

Theory of Operation

Some controllers communicate with other controllers over the CAN C BUS. The Electronic Shift Module (ESM) continuously monitors BUS activity and reads the messages it needs. The CAN C BUS is also used to communicate the MIL status to the Engine Controller.

- When Monitored:
The ignition run time is greater than one second. The battery voltage between 10 volts and 16 Volts and engine run time greater than three seconds.

- Set Condition:
The Electronic Shift Module (ESM) loses communication over the CAN Bus circuit. The circuit is continuously monitored. One trip fault.





ACTIVE DTC

NOTE: For vehicle communication problems, use the scan tool to refer to the network review screen. This screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

1. Ignition on, engine not running.
2. With a scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- perform the U0001-CAN C Bus diagnostic procedure.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.