Pinpoint Test AE: DTC U0100:00

Information and Entertainment System

Pinpoint Tests

Pinpoint Test AE: DTC U0100:00

Normal Operation

The Accessory Protocol Interface Module (APIM) receives network messages from the PCM via the High Speed Controller Area Network (HS-CAN). These messages include the odometer reading and the fuel level.

As other modules outside of the audio system also receive these messages, all modules receiving a particular message should exhibit a symptom if the message is missing.

- DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub Type Information) - set by the APIM when it is missing messages from the PCM over the HS-CAN for more than 5 seconds with the ignition in the RUN position.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- APIM
- PCM

PINPOINT TEST AE: DTC U0100:00

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AE1 VERIFY THE SCAN TOOL CAN COMMUNICATE WITH THE PCM

- Ignition ON.
- Disconnect the scan tool.
- Check that a vehicle session can be established using the scan tool.
- Can a vehicle session be established?

Yes
GO to AE2.

No
REFER to Module Communications Network Testing and Inspection to diagnose no communication with the PCM.

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AE2 CHECK FOR LOST COMMUNICATION DTCs

- Clear continuous DTCs from all modules.
- Ignition OFF.
- Ignition ON.
- Wait at least 10 seconds.
- Retrieve all continuous DTCs from all modules.
- Is DTC U0100 or DTC U0100:00 set in any modules?

Yes
GO to AE3.

No
The system is operating correctly at this time. The DTC may have been set due to an intermittent fault in the network wiring.

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AE3 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs

- Carry out the self-test for the following modules:
- APIM
- PCM
- Instrument Panel Cluster (IPC)
- Are any voltage out-of range DTCs recorded in any module?

Yes
For the APIM, REFER to DTC Charts. Information and Entertainment Systems

For all other modules, REFER to the Master DTC Chart in Multifunction Electronic Modules Testing and Inspection.

No
GO to AE4.

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AE4 CHECK FOR DTC U0100 OR DTC U0100:00 SET IN MULTIPLE MODULES

- Review the recorded results from the self-test.
- Is DTC U0100 or DTC U0100:00 set in more than one module?

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

No
INSTALL a new APIM. REFER to Accessory Protocol Interface Module (APIM) Accessory Protocol Interface Module (APIM). CLEAR all continuous DTCs. REPEAT the self-test.

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