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Home >> Lincoln >> 2000 >> Navigator 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 416 (Anti-Lock Control) >> Diagnosis And Testing >> Anti-Lock Control >> Symptom Chart
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Symptom Chart

WARNING: This page is about a different car, the 2002 Lincoln Navigator and 2002 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM CHART

Condition Possible Sources Action
  • No Communication With the Anti-Lock Brake System (ABS) Module
  • Central junction box (CJB) fuse 23 (10A).
  • Circuitry.
  • ABS module.
  • Unable to Enter Self-Test
  • Anti-lock brake system (ABS) module.
  • ABS False Activation
  • Rear axle speed sensor indicator is damaged.
  • REMOVE rear sensor from the differential housing; INSPECT rear axle speed sensor indicator.
  • Front wheel speed sensor indicator is damaged.
  • INSPECT for damaged teeth. INSPECT both front tone rings.
  • Sensor output is out of sync.
  • Intermittent open or shorted sensor circuit.
  • Chafed wire insulation or pinched wire due to improper routing causing intermittent short.
  • INSPECT wiring harness from front sensor knuckle to the frame and from the rear axle to the frame for worn or chafed wire insulation.
  • Rear brake adjustment too tight.
  • Linings are grabby.
  • ELIMINATE base brake system as cause of problem.
  • Loose sensor(s).
  • Wheels Lock Up
  • Hydraulic outlet (dump) valve.
  • Leaky inlet (isolation) valve during ABS (soft).
  • Damp or contaminated rear brake shoe linings, stuck/leaking wheel cylinder, overadjusted rear brakes.
  • Binding parking brake.
  • Leaking rear axle seal.
  • Hard or Soft Brake Pedal
  • Stuck inlet (isolation) valve (hard brake pedal) or leaky outlet (dump) valve (soft brake pedal).
  • Hydraulic leak in brake line or hose, fitting, master cylinder, wheel cylinder, or caliper (soft brake pedal).
  • Air in brake system (soft brake pedal).
  • Little or no vacuum boost (hard brake pedal).
  • Stuck or inoperative wheel cylinder or caliper (hard brake pedal).
  • Pinched or crimped brake line or hose (hard brake pedal).
  • Lack of Deceleration During Medium/Hard Brake Application
  • Stuck shut inlet (isolation) valve or leaky outlet (dump) valve (rear axle only).
  • Hydraulic leak in brake line or hose, fitting, master cylinder, wheel cylinder, or caliper.
  • Air in brake system.
  • Little or no vacuum boost.
  • Stuck or inoperative wheel cylinder or caliper.
  • Ineffective brake shoe or pad linings.
  • Vehicle Pulls During Braking
  • Improperly adjusted rear brake.
  • Frozen or binding caliper (one side of vehicle).
  • Uneven brake pad or shoe wear.
  • Pinched or crimped brake line or hose.
  • Fully or partially blocked front inlet (isolation) valve.
  • Alignment.
  • Front suspension.
  • Rear suspension.
  • Steering components.
  • ABS Warning Lamp On With System Pass
  • ABS warning lamp circuit open.
  • DISCONNECT 25-pin connector C146 from ABS module. Using a jumper wire, GROUND pin 15, circuit 603 (DG). If lamp is off, INSTALL a new ABS module. REFER to ANTI-LOCK BRAKE SYSTEM (ABS) MODULE  in this article. If lamp remains on, REPAIR circuit 603 (DG).
  • Yellow ABS Warning Indicator Does Not Self-Check
  • Circuitry.
  • Yellow ABS warning indicator bulb.
  • ABS module.
  • Instrument cluster.
  • Soft or Excessive Pedal Travel
  • Hydraulic leak in brake line, hose fitting, master cylinder, or caliper (soft brake pedal)
  • Air in brake system (soft brake pedal)
  • Hydraulic control unit (HCU).
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