For a complete wiring diagram Refer to Section 8W.The NGC controller communicates over the CAN C BUS. The transmission controller continuously monitors BUS activity. 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, a DTC will set and the Engine Controller will illuminate the MIL.When Monitored:Every 7 ms with: 1) Engine speed greater than 500 RPM.2) Battery voltage between 10 and 16 volts.Set Condition:CAN C BUS messages are not received for 10 seconds.Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diagnostic procedures and for further possible causes.