Pinpoint Test O: DTCs U0140

Anti-Lock Control

Pinpoint Test O: DTCs U0140


Normal Operation

- DTC U0140 (Lost Communication With Body Control Module (GEM))- this DTC sets in the ABS module if it cannot transmit to or receive messages from the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN) for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:

- ABS module

- BCM (Body Control Module)

PINPOINT TEST O : DTC U0140

O1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify that there is an observable symptom present.

Is an observable symptom present?

Yes
GO to O2.
No
The system is operating normally at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

O2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

- Using a scan tool, carry out a Network Test.

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

Yes
GO to O3.
No
REFER to Information Bus.

O3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND BCM (Body Control Module) SELF-TESTS

- Enter the following diagnostic mode on the scan tool: Self Test- ABS Module.

- Enter the following diagnostic mode on the scan tool: Self Test- BCM (Body Control Module).

Is DTC B1676 (or U3003:16 ) or DTC U3003:17 recorded?

Yes
For ABS module DTC B1676, GO to Pinpoint Test A. Pinpoint Test A: DTC B1676

For BCM (Body Control Module) DTCs, REFER to Body Control Systems.
No
GO to O4.

O4 CHECK FOR DTC U0140 OR U0140:00 SET IN OTHER MODULES

- Clear the DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Enter the following diagnostic mode on the scan tool: Self Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is DTC U0140 or U0140:00 set in more than 1 module?

Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation. CLEAR the DTCs. REPEAT the ABS module self-test
No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.