Pinpoint Test E: DTC U0100:00

Anti-Lock Control

Pinpoint Test E: DTC U0100:00

Refer to Wiring Diagram Set 42, Vehicle Dynamic Systems for schematic and connector information Electrical Diagrams.

Normal Operation

- DTC U0100:00 (Lost Communication With ECM/PCM "A": No Sub Type Information)- this DTC sets if the brake pedal position switch, and traction control messages that should be received from the ECM/PCM are missing for 5 seconds or longer.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- PCM

- ABS module

PINPOINT TEST E : DTC U0100

E1 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

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

Does the PCM pass the Network Test?

Yes
GO to E2.

No
REFER to Information Bus.

E2 CHECK THE ABS MODULE CMDTCs (Continuous Memory Diagnostic Trouble Codes)

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

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

- Ignition OFF.

- Ignition ON.

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

Is DTC U0100:00 present?

Yes
GO to E3.

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.

E3 CHECK THE ABS MODULE FOR BATTERY VOLTAGE DTCs

- Review the ABS module DTCs retrieved in the previous step.

Is DTC U3003:16 or DTC U3003:17 present?

Yes
GO to Pinpoint Test L Pinpoint Test L: DTCs U3003:16, U3003:17.

No
GO to E4.

E4 CHECK THE PCM CMDTCs (Continuous Memory Diagnostic Trouble Codes)

- Using a scan tool, carry out the PCM Key ON Engine OFF (KOEO) self-test.

Is DTC P1794:16 or P1794:17 present?

Yes
DIAGNOSE the PCM DTCs. REFER to Charging System
No
GO to E5.

E5 CHECK FOR DTC U0100 SET IN OTHER MODULES

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

Is DTC U0100:00 or DTC U0100 set in more than one module?

Yes
INSTALL a new PCM. TEST the system for normal operation. REPEAT the ABS module self-test.

No
INSTALL a new ABS module. REFER to Hydraulic Control Unit (HCU) Service and Repair. TEST the system for normal operation.