Pinpoint Tests AQ: DTC U0101

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AQ: 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 (6R80 transmission)
- PCM (4R70E/4R75E transmission)
- IC



PINPOINT TEST AQ: DTC U0101

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AQ1 VERIFY THE CUSTOMER CONCERN


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

Yes
GO to AQ2.

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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AQ2 CHECK THE COMMUNICATION NETWORK


- Ignition ON.
- 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 AQ3.

No
REFER to Information Bus.

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AQ3 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 AN (B1317) or GO to Pinpoint Test AO (B1318). Pinpoint Tests AN: DTC B1317 Pinpoint Tests AO: DTC B1318

No
GO to AQ4.

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AQ4 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 AQ5.

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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AQ5 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 TCM (6R80 transmission) or PCM (4R70E/4R75E transmission). REFER to Automatic Transmission/Transaxle &/or Transmission Control Systems, (mechatronic assembly) (6R80 transmission) or Computers and Control Systems (4R70E/4R75E transmission). 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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