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 PERFORMANCESYSTEMCOMPUTER CONTROL SYSTEMDIAGNOSIS & TESTINGTROUBLE CODE IDENTIFICATION
1988 Toyota Corolla SR5, 4D Wagon
Trouble Code Identification
1988 Toyota Corolla SR5, 4D WagonSECTION Trouble Code Identification
TROUBLE CODE IDENTIFICATION
| Code No. | Circuit Affected | ||
|---|---|---|---|
| No Code | System Normal | ||
| 12 & 13 | RPM Signal | ||
| 14 | Ignition Signal | ||
| 21 | O2 Sensor or O2 Heater Signal | ||
| 22 | Coolant Temp. Sensor Signal | ||
| 24 | Intake Air Temp. Sensor Signal | ||
| 25 | Lean Air/Fuel Mixture | ||
| 26 | Rich Air/Fuel Mixture | ||
| 31 | Airflow Meter Signal | ||
| 41 | Throttle Position Sensor Signal | ||
| 42 | Vehicle Speed Sensor Signal | ||
| 43 | Starter Signal | ||
| 51 | Switch Signal | ||
| 71 (1) | EGR System Malfunction | ||
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TROUBLE CODES & PROBABLE CAUSE
| Code No. | Probable Cause | ||
|---|---|---|---|
| 12 | Distributor and/or Circuit, Starter Signal, Ignitor, ECU | ||
| 13 | Distributor and/or Circuit, ECU | ||
| 14 | Ignition Coil, Ignitor and/or Circuit, ECU | ||
| 21 | O2 Sensor and/or O2 Heater Signal and/or Circuit, ECU | ||
| 22 | Coolant Temp. Sensor and/or Circuit, ECU | ||
| 24 | Intake Air Temp. Sensor or Circuit, ECU | ||
| 25 | Injector and/or Circuit, O2 Sensor and/or Circuit Airflow Meter, ECU, Fuel Line Pressure Air Intake System, Ignition System | ||
| 26 | Injector and/or Circuit, Fuel Line Pressure, Cold Start Injector, Airflow Meter, O2 Sensor and/or Circuit, ECU and/or Circuit, ECU | ||
| 31 | Airflow Meter and/or Circuit, ECU | ||
| 41 | Throttle Position Sensor and/or Circuit, ECU | ||
| 42 | Vehicle Speed Sensor and/or Circuit, ECU | ||
| 43 | Ignition Switch and/or Circuit Starter Signal Circuit, ECU | ||
| 51 | Throttle Position Sensor and/or Circuit A/C Switch Circuit, A/C Amplifier, ECU Neutral/Start Switch and/or Circuit, Accelerator Pedal and/or Cable | ||
| 71 (1) | EGR System, EGR Gas Temp. Sensor and/or Circuit, BVSV for EGR and/or Circuit, ECU | ||
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RENDER: 1.0x
NO RELATED
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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.