Pinpoint Test AB: DTCs U0140:00

Anti-Lock Control - Four-Channel

Pinpoint Tests

Pinpoint Test AB: DTCs U0140:00

Normal Operation
- DTC U0140:00 (Lost Communication With Body Control Module: No Sub Type Information) - a continuous memory DTC set by the ABS module if it does not 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:
- Communication network concern
- ABS module
- BCM

PINPOINT TEST AB: DTC U0140:00

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AB1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to AB2.

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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AB2 CHECK THE COMMUNICATION NETWORK

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

Yes
GO to AB3.

No
REFER to Module Communications Network Testing and Inspection.

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AB3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND BCM SELF-TESTS

- Check for recorded ABS module and BCM DTCs from the self-test.
- Is DTC B11E8:16 (U3003:16) or DTC B11E8:16 (U3003:17) recorded?

Yes
For DTC B11E8:16, GO to Pinpoint Test P. For DTC B11E8:17, GO to Pinpoint Test Q. For the BCM, REFER to Multifunction Electronic Modules Testing and Inspection. Pinpoint Test P: DTC B11E8:16 Pinpoint Test Q: DTC B11E8:17

No
GO to AB4.

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AB4 RECHECK THE ABS MODULE DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the ABS module self-test.
- Is DTC U0140:00 still present?

Yes
GO to AB5.

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

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AB5 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 set in more than one module?

Yes
INSTALL a new BCM. REFER to Multifunction Electronic Modules Service and Repair. CLEAR the DTCs. REPEAT the ABS module self-test

No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. TEST the system for normal operation.

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