Pinpoint Test K: DTC U0101

Anti-Lock Control

Pinpoint Test K: DTC U0101

Normal Operation

- DTC U0101 (Lost Communication With Transmission Control Module (TCM))- sets in continuous and on-demand memory in the ABS module if data messages received such as the transmission range info, from the TCM (Transmission Control Module) are missing for more than 5 seconds. For a complete list of all network messages, refer to Information Bus

This pinpoint test is intended to diagnose the following:

- Communication network concern

- TCM (Transmission Control Module)

- ABS module

PINPOINT TEST K : DTC U0101

K1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify that there is an observable symptom present.

Is an observable symptom present?

Yes
GO to K2.

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.

K2 CHECK THE COMMUNICATION NETWORK

- Connect the scan tool.

- Ignition ON.

- Using a scan tool, carry out the Network Test.

Does the TCM (Transmission Control Module) pass the Network Test?

Yes
GO to K3.

No
REFER to Information Bus.

K3 RECHECK THE ABS MODULE DTCs

- Using a scan tool, clear the ABS module DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

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

Is DTC U0101 still present?

Yes
GO to K4.

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.

K4 CHECK FOR DTC U0101 SET IN OTHER MODULES

- Using the scan tool, clear all CMDTCs (Continuous Memory Diagnostic Trouble Codes).

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

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

Is DTC U0101 set in more than one module?

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

CLEAR the DTCs. REPEAT the self-test.

No
INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.