Antilock Brakes / Traction Control Systems

Anti-Lock Control - Four-Channel

Pinpoint Test X: DTC U0100:00

Normal Operation

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

This pinpoint test is intended to diagnose the following:

- PCM

- ABS module

PINPOINT TEST X : DTC U0100:00

X1 VERIFY THE SCAN TOOL CAN COMMUNICATE WITH THE PCM

- Connect the scan tool.

- Ignition ON.

- Check that a vehicle session can be established using the scan tool.

Can a vehicle session be established?

Yes
GO to X2.

No
REFER to Information Bus to diagnose no communication with the PCM.

X2 CHECK THE ABS MODULE CONTINUOUS MEMORY DTCs

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

- Clear the ABS module DTCs.

- Ignition OFF.

- Ignition ON.

- Wait 10 seconds.

- Repeat the ABS module self-test.

Is DTC U0100:00 retrieved again?

Yes
GO to X3.

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.

X3 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO (Key ON Engine OFF) SELF-TEST

- Enter the following diagnostic mode on the scan tool: Self Test- PCM KOEO (Key ON Engine OFF).

Is DTC P0562 or P0563 recorded?

Yes
REFER to Computers and Control Systems.

No
GO to X4.

X4 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE SELF-TEST

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

Is DTC B11E8:16 or DTC B11E8:17 recorded?

Yes
For DTC B11E8:16, GO to Pinpoint Test P. Pinpoint Test P: DTC B11E8:16

For DTC B11E8:17, GO to Pinpoint Test Q. Pinpoint Test Q: DTC B11E8:17
No
GO to X5.

X5 CHECK FOR DTC U0100:00 SET IN OTHER MODULES

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

Is DTC U0100:87 set in the Remote Function Actuator (RFA) module (if equipped) or DTC U0100:00 in the Restraints Control Module (RCM)?

Yes
INSTALL a new PCM. TEST the system for normal operation.

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