Anti-Lock Brake System (ABS) and Stability Control — 2016 workshop reference 2951

Condition	Possible Sources	Actions
	enough OK button not pressed while applying the brake pedal to the required force Selectable driving mode is set to Snow-Wet Vehicle speed exceeded 40-48 km/h (25-30 mph) after the feature was initialized Diagnostic Trouble Codes (DTCs) present in the ABS module	feature use. MOVE vehicle to a flat surface and ATTEMPT to engage the Line Lock feature. START the engine and ATTEMPT to engage the Line Lock feature. The brake pressure meter in the message center must be completely filled before the Line Lock feature engages. REFER to the Owner's Literature for Line Lock feature operation. FOLLOW all instructions in the Owner's Literature and in the message center. The OK button must be pressed once the brake pressure meter in the message center to engage the Line Lock feature. REFER to the Owner's Literature for Line Lock feature operation. FOLLOW all instructions in the Owner's Literature and in the message center. The Line Lock feature cannot be used with Snow-Wet drive mode selected. SELECT Track drive mode and ATTEMPT to engage the Line Lock feature. The vehicle cannot be moving when selecting the Line Lock feature. STOP the vehicle and ATTEMPT to engage the Line Lock feature. Using a diagnostic scan tool, RETRIEVE all ABS module Diagnostic Trouble Codes (DTCs). GO to the DTC Chart: ABS Module

Pinpoint Tests

U3003:16, U300A:29

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

Normal Operation and Fault Conditions

The ABS module, hydraulic pump and solenoid valves require an operating voltage between 10 and 17 volts. The parking brake system requires an operating voltage of 9 volts or higher. The ABS module receives this voltage from the BJB. The ABS module uses a single ground circuit. The ABS module sets this DTC if there is excessive resistance or an open in one or more of these circuits, a discharged battery or an inoperative charging system.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
U3003:16	Battery Voltage: Circuit Voltage Below Threshold	This DTC sets in continuous memory and on-demand if the voltage supplied to the ABS module falls below 10 volts.
	U300A:29 Ignition Switch: Signal Invalid	This DTC sets in continuous memory and on-demand if the ABS module receives the power mode or ignition status message from the PCM and BCM, but does not receive the hard-wired ignition switch input.

DTC

Description

Fault Trigger Conditions

U3003:16

Battery Voltage: Circuit Voltage Below Threshold

This DTC sets in continuous memory and on-demand if the voltage supplied to the ABS module falls below 10 volts.

U300A:29 Ignition Switch: Signal

Invalid

This DTC sets in continuous memory and on-demand if the ABS module receives the power mode or ignition status message from the PCM and BCM, but does not receive the hard-wired ignition switch input.

Possible Causes

Fuses

Source reference 2951

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.