Symptom Chart
Symptom Chart: Anti-Lock Brake System (ABS) and Stability Control
Diagnostics in this service information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
Symptom Chart
| Condition | Possible Sources | Actions |
|---|---|---|
| A module does not respond to the diagnostic scan tool | Fuse Wiring, terminals or connectors ABS module concern |
REFER to: MODULE COMMUNICATIONS NETWORK . |
| The brake warning indicator is always or never on | Parking brake applied Low brake fluid level Brake fluid level sensor Parking brake switch Brake booster vacuum sensor IPC concern ABS concern |
RETRIEVE all ABS module Diagnostic Trouble Codes (DTCs) and GO to the DTC Chart: ABS Module in Diagnostic Trouble Code (DTC) Charts . If there are no Diagnostic Trouble Codes (DTCs) present in the ABS module, DIAGNOSE the warning indicator. REFER to: Instrumentation, Message Center and Warning Chimes . |
| The ABS warning indicator is always or never on | IPC concern ABS or stability control concern |
RETRIEVE all ABS module Diagnostic Trouble Codes (DTCs) and GO to the DTC Chart: ABS Module in Diagnostic Trouble Code (DTC) Charts . If there are no Diagnostic Trouble Codes (DTCs) present in the ABS module, DIAGNOSE the warning indicator. REFER to: Instrumentation, Message Center and Warning Chimes . |
| The stability-traction control indicator (sliding-car icon) is never or always on | IPC concern ABS or stability control concern |
RETRIEVE all ABS module Diagnostic Trouble Codes (DTCs) and GO to the DTC Chart: ABS Module in Diagnostic Trouble Code (DTC) Charts . If there are no Diagnostic Trouble Codes (DTCs) present in the ABS module, DIAGNOSE the warning indicator. REFER to: Instrumentation, Message Center and Warning Chimes . |
| ABS false activation, ABS too sensitive, ABS activates on normal stop | Front or rear suspension concern | ELIMINATE the front and rear suspension as the cause of the problem. REFER to: Suspension System . |
| RCM mounting | CONFIRM the RCM is mounted correctly. REFER to: Restraints Control Module (RCM) . | |
| Loose wheel speed sensor or excessive air gap | INSPECT wheel speed sensor for looseness or excessive air gap. TIGHTEN or INSTALL new as necessary. REFER to: Front Wheel Speed Sensor . REFER to: Rear Wheel Speed Sensor . | |
| Parking brake out of adjustment (dragging) | REFER to: Parking Brake . | |
| The traction control system cannot be disabled | Refer to the Pinpoint Test | GO to Pinpoint Test E |
| The Line Lock feature cannot be selected from the track application menu (grayed out) | Vehicle is on an incline Engine is not running Selectable driving mode is set to Snow-Wet Vehicle is traveling faster than 40-48 km/h (25-30 mph) Diagnostic Trouble Codes (DTCs) present in the ABS module |
The vehicle must be on a flat surface for Line Lock feature use. MOVE vehicle to a flat surface and ATTEMPT to select the Line Lock feature. START the engine and ATTEMPT to select the Line Lock feature. The Line Lock feature cannot be used with Snow-Wet drive mode selected. SELECT Track drive mode and ATTEMPT to select the Line Lock feature. The vehicle cannot be moving when selecting the Line Lock feature. STOP the vehicle and ATTEMPT to select the Line Lock feature. Using a diagnostic scan tool, RETRIEVE all ABS module Diagnostic Trouble Codes (DTCs). GO to the DTC Chart: ABS Module in Diagnostic Trouble Code (DTC) Charts . |
| The Line Lock feature cannot be initialized | Vehicle is on an incline Engine is not running Selectable driving mode is set to Snow-Wet Vehicle is traveling faster than 40-48 km/h (25-30 mph) Diagnostic Trouble Codes (DTCs) present in the ABS module |
The vehicle must be on a flat surface for Line Lock feature use. MOVE vehicle to a flat surface and ATTEMPT to initialize the Line Lock feature. START the engine and ATTEMPT to initialize the Line Lock feature. The Line Lock feature cannot be used with Snow-Wet drive mode selected. SELECT Track drive mode and ATTEMPT to initialize the Line Lock feature. The vehicle cannot be moving when initializing the Line Lock feature. STOP the vehicle and ATTEMPT to initialize the Line Lock feature. Using a diagnostic scan tool, RETRIEVE all ABS module Diagnostic Trouble Codes (DTCs). GO to the DTC Chart: ABS Module in Diagnostic Trouble Code (DTC) Charts |
| The Line Lock feature cannot be engaged | Spare tire is installed Driver or passenger door is open Transmission is in PARK or REVERSE Parking brake is applied Steering wheel is not in the straight-ahead position Vehicle is on an incline Engine is not running Driver applied brake pressure is not high 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 |
REPAIR and INSTALL the road wheel and ATTEMPT to engage the Line Lock feature. CLOSE the open door and ATTEMPT to engage the Line Lock feature. The transmission must be in a forward gear for the Line Lock feature to engage. PLACE the transmission in DRIVE or FIRST GEAR and ATTEMPT to engage the Line Lock feature. RELEASE the parking brake and ATTEMPT to engage the Line Lock feature TURN the steering wheel to the straight-ahead position and ATTEMPT to engage the Line Lock feature. The vehicle must be on a flat surface for Line Lock 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 in Diagnostic Trouble Code (DTC) Charts |