Pinpoint Test Z: DTC U0100:00

Information and Entertainment System

Pinpoint Test Z: 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 can 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 greater than 5 seconds with the ignition in the RUN position.

This pinpoint test is intended to diagnose the following:

- Communication network concern
- PCM

PINPOINT TEST Z: DTC U0100:00

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Z1 CHECK FOR LOST COMMUNICATION DTCs

- Ignition ON.
- 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 Z2.

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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Z2 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 low or high voltage DTCs recorded in any module?

Yes
For the APIM, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

For all other modules, REFER to the Diagnostic Trouble Code (DTC) Chart in Multifunction Electronic Modules Testing and Inspection.

No
GO to Z3.

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Z3 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
GO to Z4.

No
If there is an observable symptom, GO to Symptom Chart - General Audio System to diagnose the observed symptom. Symptom Chart - General Audio System

If there is no observable symptom, 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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Z4 CHECK FOR CORRECT PCM OPERATION

- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Is the concern still present?

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

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR all continuous DTCs. REPEAT the APIM self-test.

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