Pinpoint Tests AM: DTC U0101

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AM: DTC U0101

Normal Operation
- DTC U0101 (Lost Communication With TCM) - sets in the Instrument Cluster (IC) if the data messages received from the PCM over the High Speed Controller Area Network (HS-CAN) are missing for greater than 5 seconds.

NOTE: Once the IC sets DTC U0101, multiple gauges or indicators are likely to be inoperative in the IC. Other modules that require data from the IC all set communication DTCs and may also exhibit system function concerns.

This pinpoint test is intended to diagnose the following:

- PCM
- IC


PINPOINT TEST AM: DTC U0101

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AM1 VERIFY CUSTOMER CONCERN


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

Yes
GO to AM2.

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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AM2 CHECK THE COMMUNICATION NETWORK


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

Yes
GO to AM3.

No
REFER to Module Communications Network Testing and Inspection.

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AM3 RETRIEVE THE RECORDED DTCs FROM THE SELF-TEST


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

Yes
For DTC B1317, GO to Pinpoint Test AK. Pinpoint Tests AK: DTC B1317

For DTC B1318, GO to Pinpoint Test AL. Pinpoint Tests AL: DTC B1318

No
GO to AM4.

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AM4 CHECK FOR DTC U0101 SET IN OTHER MODULES


- 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 or RCM module(s)?

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

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

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