Pinpoint Test AM: DTC U0100:00

Four Wheel Drive (4WD) Systems - 1-Speed Torque-On-Demand

Pinpoint Tests

Pinpoint Test AM: DTC U0100:00

Normal Operation

- DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub-Type Information) - sets in continuous memory in the Transfer Case Control Module (TCCM) if data messages received from the PCM over the High Speed Controller Area Network (HS-CAN) 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 Module Communications Network Testing and Inspection.

This pinpoint test is intended to diagnose the following:

- PCM
- TCCM

PINPOINT TEST AM: DTC U0100:00

-------------------------------------------------
AM1 CHECK THE TCCM CONTINUOUS MEMORY DTCs

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: TCCM Self-Test.
- Clear the DTCs.
- Wait 10 seconds.
- Repeat the TCCM self-test.
- Is DTC U0100:00 retrieved again?

Yes
GO to AM2.

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.

-------------------------------------------------
AM2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST

- Check for recorded DTCs from the PCM Key ON Engine OFF (KOEO) self-test.
- Is DTC P0562:00 or P0563:00 recorded?

Yes
REFER to Charging System Testing and Inspection .

No
GO to AM3.

-------------------------------------------------
AM3 RETRIEVE THE RECORDED DTCs FROM THE TCCM SELF-TEST

- Check for recorded DTCs from the TCCM self-test.
- Is DTC P0562:00 or P0563:00 recorded?

Yes
GO to Pinpoint Test A Pinpoint Test A: DTCs P0562:00 and P0563:00.

No
GO to AM4.

-------------------------------------------------
AM4 CHECK FOR DTC U0100:00 SET IN OTHER MODULES

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Self-Test.
- Retrieve the continuous memory DTCs from all modules.
- Is DTC U0100:00 in the Restraints Control Module (RCM), or DTC U0100:87 in the Body Control Module (BCM)?

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. TEST the system for normal operation.

No
INSTALL a new TCCM. REFER to Transfer Case Control Module (TCCM) Service and Repair. TEST the system for normal operation. REPEAT the self-test.

-------------------------------------------------