Pinpoint Tests AV: DTC U0101:00

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test AV: DTC U0101:00

Normal Operation

- DTC U0101:00 (Lost Communication With TCM: No Sub-Type Information) - sets in the Instrument Panel Cluster (IPC) if data messages received from the TCM over the High Speed Controller Area Network (HS-CAN) are missing for greater 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:

- TCM
- IPC


PINPOINT TEST AV: DTC U0101:00

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AV1 VERIFY THE CUSTOMER CONCERN


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

Yes
GO to AV2.

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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AV2 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 pass the network test?

Yes
GO to AV3.

No
REFER to Module Communications Network Testing and Inspection.

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AV3 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST


- Check for recorded DTCs from the IPC self-test.
- Is DTC U3003:16 or DTC U3003:17 recorded?

Yes
GO to Pinpoint Test BC (U3003:16) or GO to Pinpoint Test BD (U3003:17). Pinpoint Tests BC: DTC U3003:16 Pinpoint Tests BD: DTC U3003:17

No
GO to AV4.

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AV4 RECHECK THE IPC DTCs


- Clear the DTCs. Repeat the IPC self-test.
- Is DTC U0101:00 still present?

Yes
GO to AV5.

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

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AV5 CHECK FOR DTC U0101:00 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 PCM?

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. CLEAR the DTCs. REPEAT the self-test.

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

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