Anti-Lock Brake System (ABS) and Stability Control — 2016 workshop reference 2975

H7 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) MODULE OPERATION

Connect ABS module C135. Make sure it seats and latches correctly. Connect the battery negative cable. REFER to: Battery Disconnect and Connect (414-01 Battery, Mounting and Cables, General Procedures). Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ABS module and HCU assembly. REFER to: Hydraulic Control Unit (HCU) (206-09 Anti-Lock Brake System (ABS) and Stability Control, Removal and Installation).
No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

U0100:00, U0401:00

Refer to Wiring Diagrams Cell 42 for schematic and connector information.

Normal Operation and Fault Conditions

With the ignition ON, the PCM sends messages to the ABS module through the GWM over the HS-CAN1. If the ABS module does not receive these messages within a certain time frame, the ABS module sets Diagnostic Trouble Codes (DTCs). For information on the messages sent to the ABS module by the PCM, refer to the Network Message Chart. REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description (206-09 Anti-Lock Brake System (ABS) and Stability Control, Description and Operation).

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
	U0100:00 Lost Communication With ECM / PCM "A": No Sub Type Information	This DTC sets in continuous memory and on-demand when any of the messages from the PCM are missing. This can be due to a GWM failure, PCM failure, a circuit failure or excessive load on the HS-CAN1 or HS-CAN2.
	U0401:00 Invalid Data Received From ECM / PCM "A": No Sub Type Information	This DTC sets in continuous memory and on-demand if the ABS module receives "fault" or "unknown" messages from the PCM instead of valid accelerator pedal position, ambient air temperature, cruise control system status, brake pedal applied, clutch pedal position, engine RPM, engine torque output, gear lever position, launch control system status, power pack status, reverse gear selected or transmission in reverse messages.

DTC

Description

Fault Trigger Conditions

U0100:00 Lost Communication

With ECM / PCM "A": No Sub Type Information

This DTC sets in continuous memory and on-demand when any of the messages from the PCM are missing. This can be due to a GWM failure, PCM failure, a circuit failure or excessive load on the HS-CAN1 or HS-CAN2.

U0401:00 Invalid Data Received

From ECM / PCM "A": No Sub Type Information

This DTC sets in continuous memory and on-demand if the ABS module receives "fault" or "unknown" messages from the PCM instead of valid accelerator pedal position, ambient air temperature, cruise control system status, brake pedal applied, clutch pedal position, engine RPM, engine torque output, gear lever position, launch control system status, power pack status, reverse gear selected or transmission in reverse messages.

Possible Causes

Wiring, terminals or connectors Network communication concern GWM PCM

Source reference 2975

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.