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 MANUALSTOYOTA1988COROLLA SR5, 4D WAGONREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMFEEDBACK CARBURETOR SYSTEM
1988 Toyota Corolla SR5, 4D Wagon
Feedback Carburetor System
1988 Toyota Corolla SR5, 4D WagonSECTION Feedback Carburetor System
- Description & Operation
- Testing
- Self-Diagnosis
- Diagnostic Codes
- Diagnostic Code Trouble Area (Quick Reference)
- Normal (No Code) Diagnosis
- Code 12 - RPM Signal Dianosis
- Code 21 - Oxygen Sensor Signal Dianosis
- Code 22 - Water Temperature Switch Signal Dianosis
- Code 25 - Lean Malfunction:
- Code 26 - Rich Malfunction
- Code 31 - Vacuum Switch Signal
- Code 41 - Throttle Switch Signal
- Code 71 - EGR Malfunction
- Code 72 - Fuel Cut Solenoid Signal
- Normal
- Diagnosis Circuit Inspection
- Code 12 - Rpm Signal DIANOSIS
- Code 21 - Oxygen Sensor Signal DIANOSIS
- Code 22 - Water Temperature Switch Signal DIANOSIS
- Code 25 - Lean Malfunction
- Code 26 - Rich Malfunction
- Code 31 - Vacuum Switch Signal
- Code 41 - Throttle Switch Signal
- Code 71 - EGR Malfunction
- Code 72 - Fuel Cut Solenoid Signal
- Diagnostic Code Trouble Area (Quick Reference)
- Wiring Diagrams
RENDER: 1.0x
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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.