Transfer Case

Four Wheel Drive (4WD) Systems - Electronic Shift

Pinpoint Test W: DTC U0101:00

Normal Operation

- DTC U0101:00 (Lost Communication With TCM (Transmission Control Module) : No Sub Type Information)- sets in continuous memory in the Transfer Case Control Module (TCCM) if data messages received from the Transmission Control Module (TCM) 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.

This pinpoint test is intended to diagnose the following:

- TCM (Transmission Control Module) (diesel engine)

- PCM (gasoline engines)

- TCCM (Transfer Case Control Module)

PINPOINT TEST W : DTC U0101:00

W1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to W2.

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

W2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

- Enter the following diagnostic mode on the scan tool: Network Test.

- Carry out the network test.

Does the TCM (Transmission Control Module) module pass the network test?

Yes
GO to W3.

No
REFER to Information Bus.

W3 RETRIEVE THE RECORDED DTCs FROM THE TCCM (Transfer Case Control Module) SELF-TEST

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

Is DTC P0562:00 or P0563:00 recorded?

Yes
GO to Pinpoint Test G. Pinpoint Test G: DTCs P0562:00 and P0563:00
No
GO to W4.

W4 RECHECK THE TCCM (Transfer Case Control Module) DTCs

NOTE: If new modules were installed prior to the DTC being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the PMI (Programmable Module Installation) may not have been carried out.

- Clear the DTCs.

- Wait 10 seconds.

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

Is DTC U0101:00 still present?

Yes
GO to W5.

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.

W5 CHECK FOR DTC U0101:00 SET IN OTHER MODULES

- Clear all DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Enter the following diagnostic mode on the scan tool: Self-Test.

- Retrieve the continuous memory DTCs from all modules.

Is DTC U0101:00 or DTC U0101 set in more than one module?

Yes
INSTALL a new TCM (Transmission Control Module) (diesel engine) or PCM (gasoline engines). For TCM (Transmission Control Module), REFER to Transmission Service Components - Exploded View, External Components in Automatic Transmission/Transaxle &/or Transmission Control Systems.

For PCM, REFER to Computers and Control Systems. CLEAR the DTCs. REPEAT the self-test.

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