Pinpoint Test AE: DTC U0100:00

Electronic Locking Differential (ELD) System

Pinpoint Test AE: DTC U0100:00

Normal Operation

- DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub-Type Information)- sets in continuous memory in the TCCM (Transfer Case Control Module) if data messages received from the PCM over the HS-CAN (High Speed Controller Area Network) are missing for 5 seconds or longer with ignition in RUN and battery voltage in range. For a complete list of all network messages, refer to Information Bus.

This pinpoint test is intended to diagnose the following:

- PCM

- TCCM (Transfer Case Control Module)

PINPOINT TEST AE : DTC U0100:00

AE1 CHECK THE TCCM (Transfer Case Control Module) CONTINUOUS MEMORY DTCs

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: TCCM (Transfer Case Control Module) Self-Test.

- Clear the DTCs.

- Wait 10 seconds.

- Repeat the TCCM (Transfer Case Control Module) self-test.

Is DTC U0100:00 retrieved again?

Yes
GO to AE2.
No
The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.

AE2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST

- Check for recorded DTCs from the PCM KOEO (Key ON Engine OFF) self-test.

Is DTC P0562:00 or P0563:00 recorded?

Yes
REFER to Charging System.
No
GO to AE3.

AE3 RETRIEVE THE RECORDED DTCs FROM THE TCCM (Transfer Case Control Module) SELF-TEST

- Check for recorded DTCs from the TCCM (Transfer Case Control Module) self-test.

Is DTC P0562:00 or P0563:00 recorded?

Yes
REFER to GO to Pinpoint Test M Pinpoint Test M: DTC P0562:00 Or P0563:00.
No
GO to AE4.

AE4 CHECK FOR DTC U0100:00 SET IN OTHER MODULES

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Self-Test- All CMDTCs (Continuous Memory Diagnostic Trouble Codes).

- Retrieve the continuous memory DTCs from all modules.

Is DTC U0100:00 in the RCM (Restraints Control Module), or DTC U0100:87 in the BCM (Body Control Module) ?

Yes
INSTALL a new PCM. TEST the system for normal operation.
No
INSTALL a new TCCM (Transfer Case Control Module). REFER to Transfer Case Control Module (TCCM) . TEST the system for normal operation.