ECM/PCM "A"

U0101-LOST COMMUNICATION WITH ECM/PCM "A"

For a complete wiring diagram REFER to DIAGRAMS/ELECTRICAL .


- When Monitored:
With the ignition on, battery voltage between 9 and 16 volts, and engine run time greater than 3 seconds.

- Set Condition:
An expected bus message is not received for a specific amount of time.







Refer to Communications Test for this DTC and/or Manufacturer Code Charts for diagnostic procedures and for further possible causes.


Diagnostic Test


1. ACTIVE DTC
NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The 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.

Turn the ignition on.
With a scan tool, select View DTCs.
Is the status Active for this DTC?

Yes


- Diagnose and repair the active DTC(s).


No


- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking For An Intermittent DTC
- Perform the PCM Verification Test.Powertrain Verification Test