Pinpoint Test H: DTCs U0140:00

Anti-Lock Control

Pinpoint Test H: DTCs U0140:00

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information. Diagrams By Number

Normal Operation
- DTC U0140:00 (Lost Communication With Body Control Module: No Sub Type Information) - this DTC sets in the ABS module if it cannot transmit or receive messages to the Body Control Module (BCM) over the High Speed Controller Area Network (HS-CAN) for 5 seconds or longer. This DTC is actually referring to the IPC as this vehicle is using the IPC as a gateway module and never directly establishes communications with the BCM.

This pinpoint test is intended to diagnose the following:
- ABS module
- IPC

PINPOINT TEST H: DTC U0140:00

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H1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to H2.

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.

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H2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the IPC pass the network test?

Yes
GO to H3.

No
REFER to Module Communications Network Testing and Inspection.

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H3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND IPC SELF-TESTS

- Check for recorded ABS module and IPC DTCs from the self-test.
- Is DTC U3003:16 (or B1318) or DTC U3003:17 (or B1317) recorded?

Yes
For the ABS module, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

For the IPC, REFER to Instrumentation, Message Center, and Warning Chimes Testing and Inspection.

No
GO to H4.

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H4 CHECK FOR DTC 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.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0140:00 or DTC U0140 set in more than one module?

Yes
INSTALL a new IPC. REFER to Instrumentation, Message Center, and Warning Chimes Service and Repair . TEST the system for normal operation. CLEAR the DTCs. REPEAT the ABS module self-test.

No
INSTALL a new ABS module. REFER to Hydraulic Control Unit (HCU) Service and Repair. TEST the system for normal operation.

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