Anti-Lock Brake System (ABS) and Stability Control — 2016 workshop reference 2959

this concern, DISCONTINUE this test and FOLLOW the TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new ABS module. REFER to: Anti-Lock Brake System (ABS) Module (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.

C0040:64

Refer to Wiring Diagrams Cell 31 for schematic and connector information.

Normal Operation and Fault Conditions

The ABS module receives BPP switch (stoplamp switch) input from the PCM through the GWM over the HS-CAN2. The ABS module compares this information against the internal pressure sensor in the HCU. An incorrectly installed BPP switch can cause a signal plausibility concern. An implausible signal can also be created if the driver is resting one foot on the brake pedal while using the other foot to press the accelerator.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
	C0040:64 Brake Pedal Switch "A": Signal Plausibility Failure	This DTC sets in continuous memory if the master cylinder pressure signal exceeds 15 bar and the BPP switch message from the PCM is inactive for longer than 1 second.

DTC

Description

Fault Trigger Conditions

C0040:64 Brake Pedal Switch "A":

Signal Plausibility Failure

This DTC sets in continuous memory if the master cylinder pressure signal exceeds 15 bar and the BPP switch message from the PCM is inactive for longer than 1 second.

Possible Causes

Wiring, terminals or connectors. BPP switch Network communication concern PCM

Visual Inspection and Diagnostic Pre-checks

Make sure the brake pedal switch electrical connector is connected and free of corrosion and other contaminants. Make sure the brake pedal switch is installed correctly. Make sure the brake pedal switch is operating correctly.

PINPOINT TEST C : C0040:64

C1 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE DIAGNOSTIC TROUBLE CODES (DTCS)

Using a diagnostic scan tool, carry out the ABS module self-test. Retrieve and record all ABS module Diagnostic Trouble Codes (DTCs).

Is DTC U0100:00, U0401:00 present?

Yes	DIAGNOSE DTC U0100:00 or U0401:00 before diagnosing DTC C0040:64. GO to the DTC Chart: ABS Module.
No	GO to C2

Source reference 2959

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.