Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1991PROBE GL, STANDARDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM
1991 Ford Probe GL, Standard
Anti-Lock Brake System
1991 Ford Probe GL, StandardSECTION Anti-Lock Brake System
- Description
- Safety Precautions
- Operation
- Bleeding Brake System
- Basic Diagnosis
- Quick Tests (All Testing Starts With Test Qt-1)
- Pinpoint Tests
- AFR-1 Integrity
- AFR-2 Short To Ground Check
- AFR-3 Resistance At Abs Unit
- AFR-4 Resistance At Sensor
- AFR-5 Signal At Abs Control Unit
- AFR-6 Sensor Set-Up Check
- AFR-7 Abs Control Unit Check
- AFL-1 Integrity
- AFL-2 Short To Ground Check
- AFL-3 Resistance At Abs Control Unit
- AFL-4 Resistance At Sensor
- AFL-5 Signal At Abs Control Unit
- AFL-6 Sensor Set-Up Check
- AFL-7 Abs Control Unit Check
- ARW-1 Integrity
- ARW-2 Short To Ground Check
- ARW-3 Resistance At Abs Control Unit
- ARW-4 Resistance At Sensor
- ARW-5 Signal At Abs Control Unit
- ARW-6 Sensor Set-Up Check
- ARW-7 Abs Control Unit Check
- BFR-1 Check Rotor Teeth For Damage
- BFR-2 Check Sensor Installation
- BFL-1 Check Rotor Teeth For Damage
- BFL-2 Check Sensor Installation
- Brr-1 Check Rotor Teeth For Damage
- Brr-2 Check Sensor Installation
- BRL-1 Check Rotor Teeth For Damage
- BRL-2 Check Sensor Installation
- Ca-1 Integrity
- Ca-2 Hydraulic Pump Motor Check From Hydraulic Control Unit
- Ca-3 Hydraulic Pump Motor Check From Abs Control Unit
- Ca-4 Abs Output Check
- Ca-5 Pump Operation Check
- Ca-6 Hydraulic Unit Ground Check
- Ca-7 Pressure Switch(Es) Operation
- Db-1 Integrity
- Db-2 Voltage At Abs Control Unit
- Db-3 Voltage At Abs Control Unit
- Db-4 Voltage Without Relay
- Db-5 Continuity To Ground
- Db-6 Continuity To Hydraulic Control Unit
- Db-7 Hydraulic Ground Check
- Db-8 Voltage At Relay
- Dc-1 Integrity
- Dc-2 Voltage At Abs Control Unit
- Dc-3 Voltage At Abs Control Unit
- Dc-4 Voltage From Relay
- Dc-5 Voltage At Relay
- De-1 Integrity
- De-2 Voltage At Hydraulic Control Unit
- De-3 Voltage At Abs Control Unit Terminal "E"
- De-4 Relay Diode Check At Abs Control Unit
- De-5 Relay Diode Check At Relay
- De-6 Voltage At Abs Control Unit Terminal "B"
- De-7 Voltage At Abs Control Unit Terminal "B" Without Motor
- De-8 Voltage From Relay
- Fa-1 Integrity
- Fa-2 Solenoid Signal Check
- Fa-3 Solenoid Check At Abs Control Unit
- Fa-4 Solenoid Check At Hydraulic Control Unit
- Fa-5 Relay Operation
- HUC-1 Integrity
- HUC-2 Power To Abs Control Unit
- HUC-3 Abs Control Unit Ground Check
- P-1 Check For Short
- P-2 Check For Short To Power
- P-3 Check Abs Control Unit
- Q-1 Brake On-Off Switch Check
- Q-2 Alternator Output
- Q-3 Power To System
- Q-4 Key Power Check
- Q-5 Power From Ignition Switch
- Q-6 Relay Operation
- Q-7 Ground Check
- Q-8 Pressure Switch Check
- Q-9 Check For Short To Power
- Q-10 Test Connector Continuity
- Removal & Installation
- Adjustments
- Torque Specifications
- Wiring Diagrams
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.