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.
1992 Toyota Corolla LEFACTORY OEM SERVICE PROCEDURE
Trouble Code Identification Charts
COROLLA CODE IDENTIFICATION
| Code No. | System Affected | Probable Cause | ||||||
|---|---|---|---|---|---|---|---|---|
| 12 & 13 | RPM Signal | Distributor/Integrated Ignition Assembly Or Ckt, Starter Circuit, ECU | ||||||
| 14 | Ignition Signal | Ignitor Or Ckt To ECU, ECU | ||||||
| 21 | Oxygen Sens Signal | Oxygen Sens Or Ckt, ECU | ||||||
| 22 | Coolant Temp Sens Signal | Coolant Temp Sens Or Ckt, ECU | ||||||
| 24 (1) | Intake Air Temp Sens Signal | Intake Air Temp Sens Or Ckt, ECU | ||||||
| 25 | Lean Air/Fuel Mixture | Loose Ground, Injector Or Ckt, Oxygen Sens Or Ckt, Fuel Pressure, Ignition Sys, Coolant Temp Sens, Vacuum Sens, ECU | ||||||
| 26 | Rich Air/Fuel Mixture | Loose Ground, Injector Or Ckt, Oxygen Sens Or Ckt, Fuel Pressure, Cold Start Injector Or Ckt, Coolant Temp Sens, Vacuum Sens, Compression Pressure, ECU | ||||||
| 31 | Vacuum Sens Signal | Vacuum Sens Or Ckt, ECU | ||||||
| 41 (1) | Throttle Position Sens Signal | Throttle Position Sens Or Ckt, ECU | ||||||
| 42 (2) | Vehicle Speed Sens Signal | Vehicle Speed Sens Or Ckt, ECU | ||||||
| 43 (2) | Starter Signal | Starter Signal Ckt, Ignition Switch Or Ckt, ECU | ||||||
| 51 (2) | Switch Condition Signal | A/C Switch Ckt, Neutral/Start Switch Or Ckt, TPS Or Ckt ECU | ||||||
| 71 (3) | EGR Sys Malfunction | EGR Sys, EGR Temp Sens Or Ckt, EGR-VSV, ECU | ||||||
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Factory Service Tools
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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.
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