Pinpoint Test F: DTC U0100:00

Anti-Lock Control

Pinpoint Test F: DTC U0100:00

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:

- PCM

- ABS module

PINPOINT TEST F : DTC U0100:00

F1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.

- Verify there is an observable symptom present.

Is an observable symptom present?

Yes
GO to F2.

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.

F2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.

- Using a scan tool, carry out the network test.

Does the PCM (Powertrain Control Module) pass the network test?

Yes
GO to F3.

No
REFER to Information Bus.

F3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND PCM (Powertrain Control Module) SELF-TESTS

- Check for recorded ABS and PCM (Powertrain Control Module) DTCs from the network test.

Is DTC U3003:16 (or B1318) or DTC U3003:17 (or B1317) recorded?

Yes
For the ABS module, REFER to DTC Chart Anti-Lock Brake System (ABS) and Stability Control.

For the PCM (Powertrain Control Module), REFER to Computers and Control Systems.

No
GO to F4.

F4 CHECK FOR DTCs U0100:00 OR U0100 SET IN OTHER MODULES

- Using a scan tool, clear the DTCs.

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

Yes
INSTALL a new PCM (Powertrain Control Module). TEST the system for normal operation. REPEAT the ABS module self-test.

No
For vehicles without adaptive cruise control, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module Service and Repair. TEST the system for normal operation.

For vehicles with adaptive cruise control, INSTALL a new HCU (Hydraulic Control Unit). REFER to Hydraulic Control Unit (HCU) Service and Repair.