U140D

U140D-IMPLAUSIBLE WHEEL SPEED SIGNALS RECEIVED

For a complete wiring diagram refer to Diagrams/Electrical. Electrical Diagrams


Theory of Operation


The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.



- When Monitored:

Continuously with the ignition on, one valid CAN ID received at least once, and no U0002-CAN Bus Off Performance DTC present.

- Set Condition:

When the TCM detects an incorrect CAN ID from the ABS control module.







Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure



Diagnostic Test


1. CHECK FOR TIPM CAN BUS DTCS

With the scan tool, read TIPM DTCs.

Are there any TIPM CAN BUS DTCs present?

Yes

- Refer to Communications and perform the appropriate symptom(s).
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Go To 2



2. CHECK IF ABS DTC'S ARE PRESENT

With the scan tool, read ABS DTCs.

Are there any ABS DTCs present?

Yes

- Refer to Brakes and Traction Control/Testing and Inspection to perform the appropriate diagnostics.
- Perform AS68RC VERIFICATION TEST. Verification Tests

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace the TCM.
- Perform AS68RC VERIFICATION TEST. Verification Tests