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Home >> Ford >> 2000 >> Contour SVT >> Repair and Diagnosis >> External Pages >> Different car >> Section 455 (Anti-Lock Brake System) >> Diagnosis And Testing >> Anti-Lock Control >> Symptom Chart
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Symptom Chart

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM

Condition Possible Sources Action
  • No communication with the anti-lock brake system (ABS) control module
  • Circuitry or connection in the international standards organization (ISO) 9141 network.
  • ABS control module.
  • Loss of sensor signal during vehicle deceleration or sensor signal drops out at low speed
  • Wheel speed sensor indicator.
  • Sensor output is weak.
  • Air gap.
  • Incorrectly adjusted rear brakes or brake shoe or pad linings grab
  • Rear brake adjustment.
  • Linings.
  • Base brake mechanical concern for wheels lockup
  • Rear brake shoe linings.
  • Wheel cylinder.
  • Rear brakes.
  • Parking brake.
  • Rear axle seal.
  • Soft pedal/spongy pedal no warning indicator
  • Brake line or hose, fitting, master cylinder, wheel cylinder or caliper.
  • Air in brake system.
  • Base brake mechanical concern (hard pedal)
  • Vacuum boost.
  • Wheel cylinder or caliper.
  • Brake line or hose.
  • Base brake hydraulic concern during medium/hard brake application
  • Brake line or hose, fitting, master cylinder, wheel cylinder or caliper.
  • Air in brake system.
  • Base brake mechanical concern during medium/hard brake application
  • Vacuum boost.
  • Wheel cylinder or caliper.
  • Brake line or hose.
  • Brake shoe or pad linings.
  • Base brake mechanical concern for vehicle pulls
  • Rear brake.
  • Caliper.
  • Brake pad or shoe wear.
  • Base brake hydraulic concern for vehicle pulls
  • Brake line or hose.
  • One wheel locks up; no DTCs recorded
  • Caliper.
  • Wheel cylinder.
  • Brake linings.
  • Hydraulic control unit (HCU).
  • The red brake warning indicator stays on when the ignition switch is in RUN
  • Circuitry.
  • Instrument cluster.
  • Anti-lock brake system (ABS) control module.
  • The ABS warning indicator stays on when the ignition switch is in RUN
  • Circuitry.
  • Instrument cluster.
  • Anti-lock brake system (ABS) control module.
  • The red brake warning indicator does not self-check
  • Circuitry.
  • Instrument cluster.
  • Anti-lock brake system (ABS) control module.
  • The yellow ABS warning indicator does not self-check
  • Circuitry.
  • Instrument cluster.
  • Anti-lock brake system (ABS) control module.
  • The yellow ABS warning indicator self-checks OK but automatically begins flashing
  • Circuitry.
  • Anti-lock brake system (ABS) control module.
  • Hydraulic control unit (HCU).
  • RETRIEVE the DTCs and go to the .
  • Soft/hard/excessive brake pedal travel
  • Brake line or hose, fitting, master cylinder, wheel cylinder, wheel cylinder or caliper.
  • Air in brake system.
  • HCU.
  • Inspect the HCU for visible signs of leaking. If any leaks are present, REPAIR or REPLACE as necessary and bleed the brake system. For additional information, refer to BRAKE SYSTEM-GENERAL INFORMATION
  • The yellow ABS/red brake light always on, no DTCs
  • Circuitry.
  • Anti-lock brake system control (ABS) module.
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