U0100-LOST COMMUNICATION WITH ECM/PCM

For a complete wiring diagram Refer to Section 8W.

Theory of Operation

The Controller Area Network (CAN) is a high speed serial communication line for multiplex communication between multiple controllers that reside on the network. The Transmission Control Module monitors the transmit and receive message from the CAN BUS.

• When Monitored:

  Ignition on in the run position with a system voltage between 9.0 and 16.0 volts.

  IOD fuse is installed or vehicle odometer is over 80 kilometers (50 miles).

  No CAN C Bus DTCs present.

• Set Condition:

  A loss of CAN Bus communication between the TCM and ECM/PCM for the period of 2.0 seconds.

For CAN Bus diagnostic procedures refer to (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING)