For a complete wiring diagram Refer to Section 8W.Some NGC controllers communicate with other controllers over the CAN C Bus. The transmission controller continuously monitors the Bus activity and receives the messages it needs. The CAN C Bus is also used to communicate transmission MIL status to the Engine Controller. If the Engine Controller is unable to communicate with the Transmission Controller, the Engine Controller will light the MIL.When Monitored:Every 7 msec. with: 1) Engine speed greater than 500 rpm. 2) Battery voltage greater than 10v but less than 16v.Set Condition:CAN C Bus messages not received for 10 seconds.Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes.