Pinpoint Test AU: DTC U0101

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AU: DTC U0101

Normal Operation
- DTC U0101 (Lost Communication With TCM) - sets in continuous memory if data messages received from the Transmission Control Module (TCM) over the High Speed Controller Area Network (HS-CAN) are missing for greater than 5 seconds.

This pinpoint test is intended to diagnose the following:

- TCM (part of the mechatronics assembly)
- Instrument Cluster (IC)

PINPOINT TEST AU: DTC U0101

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AU1 VERIFY THE CUSTOMER CONCERN


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

Yes
GO to AU2.

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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AU2 CHECK THE COMMUNICATION NETWORK


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

Yes
GO to AU3.

No
REFER to Module Communications Network Testing and Inspection.

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AU3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


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

Yes
GO to Pinpoint Test AR (B1317) or GO to Pinpoint Test AS (B1318). Pinpoint Test AR: DTC B1317 Pinpoint Test AS: DTC B1318

No
GO to AU4.

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AU4 RECHECK THE IC DTCs


NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI may not have been carried out.

- Clear the DTCs. Repeat the IC self-test.
- Is DTC U0101 still present?

Yes
GO to AU5.

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

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AU5 CHECK FOR DTC U0101 SET IN OTHER MODULES


- Clear all 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 set in the ABS module?

Yes
INSTALL a new mechatronic assembly. REFER to Automatic Transaxle/Transmission - 6R80 Service and Repair to install a new mechatronic assembly. CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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