U140F-IMPLAUSIBLE ENGINE VARIANT DATA

For a complete wiring diagram Refer to Section 8W.

Theory of Operation


During the initial ignition on, the Transmission Control Module (TCM) receives the calibrated data from the Engine/Powertrain Control Module (ECM/PCM) over the CAN Bus and stores this information in the EEPROM of the TCM. During normal operation the TCM compares the stored data in the EEPROM to the transmitted data from the ECM/PCM. If the calibration data does not match the DTC will set and the MIL will illuminate after two consecutive failures.


  • When Monitored:

    Ignition on, engine running with a system voltage between 9.0 and 16.0 volts.

    ECM/PCM variant data received more than twice in a row over the CAN Bus.

  • Set Condition:

    ECM/PCM has wrong variant data installed.

    ECM/PCM sending wrong or improper CAN message for more than 5.0 seconds.


Possible Causes
  
FCM/TIPM DTCS PRESENT
  
WRONG ENGINE CONTROLLER SOFTWARE
  
WRONG TRANSMISSION CONTROLLER SOFTWARE
  
ENGINE CONTROL MODULE
  
TRANSMISSION CONTROL MODULE
  

Always perform the CVT Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)



Diagnostic Test

1.CHECK IF THE DTC IS ACTIVE



Is the status Active for this DTC or is the STARTS SINCE SET counter 2 or less?

Yes
  • Go To 2


No
  • Go To 5

2.CHECK FOR FCM/TIPM CAN BUS DTCS



Are there any FCM/TIPM CAN BUS DTCs present?

Yes


No
  • Go To 3

3.CHECK IF THE ECM/PCM WAS REPLACED


Was the ECM/PCM replaced?

Yes
  • Check to make sure the right part number was used that correlates with the engine and transmission using the vehicle identification number. It may be necessary to flash the ECM/PCM to the proper configuration or replace the controller. With the scan tool perform a TCM relearn procedure.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)


No
  • Go To 4

4.CHECK IF THE TCM WAS REPLACED


Was the TCM replaced?

Yes
  • Check to make sure the right part number was used that correlates with engine and transmission using the vehicle identification number. It may be necessary to flash the PCM/TCM to the proper configuration or replace the TCM with the correct configuration. With the scan tool perform a TCM relearn procedure.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)


No
  • Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Check for any Service Bulletins for possible causes that may apply. If no problems are found, replace the TCM per the Service Information.
  • Perform CVT VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - CVT - STANDARD PROCEDURE)

5.INTERMITTENT WIRING AND CONNECTORS





Were there any problems found?

Yes


No
  • Test Complete.