Pinpoint Test M: DTC U0102

Anti-Lock Control - Three-Channel

Pinpoint Tests

Pinpoint Test M: DTC U0102

Normal Operation
- DTC U0102 (Lost Communication With Transfer Case Control Module) - sets in continuous and on-demand memory in the ABS module if data messages such as Four-Wheel Drive (4WD) information, are missing for more than 5 seconds. For a complete list of all network messages, refer to Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:
- Communication network concern
- Transfer Case Control Module (TCCM)
- ABS module

PINPOINT TEST M: DTC U0102

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M1 VERIFY THE CUSTOMER CONCERN

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

Yes
GO to M2.

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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M2 CHECK THE COMMUNICATION NETWORK

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

Yes
GO to M3.

No
REFER to Module Communications Network Testing and Inspection.

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M3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST

- Check for recorded ABS DTCs from the self-test.
- Is DTC B1317 or DTC B1318 recorded?

Yes
For DTC B1317, GO to Pinpoint Test A. For DTC B1318, GO to Pinpoint Test B. Pinpoint Test A: DTC B1317 Pinpoint Test B: DTC B1318

No
GO to M4.

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M4 RECHECK THE ABS MODULE DTCs

- Clear the DTCs.
- Wait 10 seconds.
- Repeat the ABS module self-test.
- Is DTC U0102 still present?

Yes
GO to M5.

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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M5 CHECK FOR DTC U0102 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 U0102:00 or DTC U0102 set in more than one module?

Yes
INSTALL a new TCCM. REFER to Four Wheel Drive (4WD) Systems . TEST the system for normal operation. 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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