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