Pinpoint Test Y: DTC U0101:00

Anti-Lock Control - Four-Channel

Pinpoint Tests

Pinpoint Test Y: DTC U0101:00

Normal Operation
- DTC U0101:00 (Lost Communication With TCM: No Sub Type Information) - a continuous memory DTC set by the ABS module if the transmission range data should be received from the Transmission Control Module (TCM) is missing for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:
- Communication network concern
- TCM
- ABS module

PINPOINT TEST Y: DTC U0101:00

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Y1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to Y2.

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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Y2 CHECK THE COMMUNICATION NETWORK

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

Yes
GO to Y3.

No
REFER to Module Communications Network Testing and Inspection.

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Y3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND TCM SELF-TESTS

- Check for recorded ABS and TCM DTCs from the self-test.
- Is DTC P1397:00 (or B11E8:16) or (or B11E8:17) recorded?

Yes
For DTC B11E8:16, GO to Pinpoint Test P. For DTC B11E8:17, GO to Pinpoint Test Q. For the TCM, REFER to Automatic Transaxle/Transmission - TorqShift(R) Testing and Inspection. Pinpoint Test P: DTC B11E8:16 Pinpoint Test Q: DTC B11E8:17

No
GO to Y4.

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Y4 CHECK FOR DTCs U0101:00 OR U0101 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 U0101:00 or DTC U0101 set in more than one module?

Yes
INSTALL a new TCM. 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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