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 MANUALSPONTIAC1990GRAND PRIX STE, 3.1 VREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGSYMPTOM TESTINGRED WARNING LIGHT
1990 Pontiac Grand Prix STE, 3.1 V
Red Warning Light
1990 Pontiac Grand Prix STE, 3.1 VSECTION Red Warning Light
- With ignition off, attach Tech I (94-00101-A) scanner to ALDL connector. Turn ignition on. Read brake pressure from scanner. If brake pressure is less than 1800 psi (127 kg/cm2 ), scan anti-lock controller for additional codes. If no codes are found, perform ABS-III SYSTEM FUNCTION CHECK "A".
- If brake pressure is greater than 1800 psi (127 kg/cm2 ), disengage fluid level sensor switch connector from Powermaster-III and apply service brakes. Release parking brake. If light remains on, check parking brake switch and fluid level sensor wire harness and connectors. Repair or replace as necessary.
NOTE:
The following tests should only be used if a diagnostic chart has directed technician to these tests or if a problem exists but no codes have been set.
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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.