Antilock Brakes / Traction Control Systems

Diagnostic Routine I

Diagnostic Overview

U0140:00

Refer to Wiring Diagram Set 42 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

With the ignition ON, the BCM (Body Control Module) sends messages to the ABS (Anti-Lock Brake System) module over the HS-CAN (High Speed Controller Area Network). If the ABS (Anti-Lock Brake System) module does not receive these messages within a certain time frame (less than 1 second), the ABS (Anti-Lock Brake System) module sets DTCs (Diagnostic Trouble Codes). For information on the messages sent to the ABS (Anti-Lock Brake System) module by the BCM (Body Control Module), REFER to Network Message Chart .

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK THE COMMUNICATION NETWORK

1. Ignition ON.

2. Using a scan tool, carry out the network test.

Does the BCM (Body Control Module) pass the network test?






2. CHECK THE ABS (Anti-Lock Brake System) MODULE CMDTCs (Continuous Memory Diagnostic Trouble Codes)

1. Using a scan tool, carry out the ABS (Anti-Lock Brake System) module self-test.

2. Clear the DTCs (Diagnostic Trouble Codes).

3. Ignition OFF.

4. Ignition ON.

5. Repeat the ABS (Anti-Lock Brake System) module self-test.

6. Record the ABS (Anti-Lock Brake System) module DTCs (Diagnostic Trouble Codes).

Is DTC (Diagnostic Trouble Code) U0140:00 retrieved again?






3. REVIEW THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE ABS (Anti-Lock Brake System) MODULE SELF-TEST

1. Check the recorded DTCs (Diagnostic Trouble Codes) from the ABS (Anti-Lock Brake System) module self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 or U3003:17 present?






4. CHECK FOR DTCs (Diagnostic Trouble Codes) IN THE BCM (Body Control Module)

1. Using a scan tool, carry out the BCM (Body Control Module) self-test.

Is DTC (Diagnostic Trouble Code) U3003:16 or U3003:17 present?






5. CHECK FOR DTC (Diagnostic Trouble Code) U0140:00 SET IN OTHER MODULES

1. Using the scan tool, carry out the self-test for all modules.

2. Retrieve and record the CMDTCs (Continuous Memory Diagnostic Trouble Codes) from all modules.

Is DTC (Diagnostic Trouble Code) U0140:00 set in any other module?