Pinpoint Test AD: DTC U0100:00

Information and Entertainment System

Pinpoint Test AD: 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 (Engine Control Module) /PCM "A": No Sub Type Information)- set by the APIM (Accessory Protocol Interface Module) when it is missing messages from the PCM over the HS-CAN (High Speed Controller Area Network) 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 AD : DTC U0100:00

AD1 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 AD2.

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

AD2 CHECK FOR BATTERY VOLTAGE OUT-OF-RANGE DTCs

- Carry out the self-test for the following modules:
- APIM (Accessory Protocol Interface Module)

- PCM

- Instrument Panel Cluster (IPC)


Is DTC B1317, B1318, U3003:16, or U3003:17 recorded in any module?

Yes
For the APIM (Accessory Protocol Interface Module) , REFER to DTC Charts. Accessories and Optional Equipment

For all other modules, REFER to the master list in Body Control Systems.

No
GO to AD3.

AD3 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 AD4.

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, CHECK the wiring between the APIM (Accessory Protocol Interface Module) and the PCM for an intermittent fault.

AD4 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. CLEAR all continuous DTCs. REPEAT the APIM (Accessory Protocol Interface Module) 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 (Accessory Protocol Interface Module) self-test.