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. Diagrams By Number

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 E: DTC U0100

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E1 VERIFY THE CUSTOMER CONCERN

- Ignition ON.
- Verify that there is an observable symptom present.
- Is an observable symptom present?

Yes
GO to E2.

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.

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E2 CHECK THE COMMUNICATION NETWORK

- Ignition ON.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Carry out the network test.
- Does the PCM pass the network test?

Yes
GO to E3.

No
REFER to Module Communications Network Testing and Inspection.

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E3 RETRIEVE THE RECORDED DTCs FROM THE ABS MODULE AND PCM SELF-TESTS

- Check for recorded ABS and PCM DTCs from the self-test.
- Is DTC U3003:16 (or B1318) or DTC U3003:17 (or B1317) recorded?

Yes
For the ABS module, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

For the PCM, REFER to Electronic Engine Controls P Codes for Electronic Engine Controls.

No
GO to E4.

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E4 CHECK FOR DTC U0100 SET IN OTHER MODULES

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

Yes
INSTALL a new PCM. REFER to Electronic Engine Controls Service and Repair. 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.

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