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 MANUALSTOYOTA1994TERCEL DX, 4D SEDAN, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESTROUBLE CODE IDENTIFICATION
1994 Toyota Tercel DX, 4D Sedan, Standard
Trouble Code Identification
1994 Toyota Tercel DX, 4D Sedan, StandardSECTION Trouble Code Identification
TROUBLE CODE IDENTIFICATION
| Code | System Affected | (1) Normal Mode | (2) Test Mode | Probable Cause | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 12 | RPM Signal | ON | Distributor, Starter Or Circuit, ECM | |||||||||
| 13 | RPM Signal | ON | Distributor Or Circuit, ECM | |||||||||
| 14 | Ignition Signal | ON | Ignitor Or Circuit To ECM, ECM | |||||||||
| 21 | Oxygen Sensor Signal | ON | Oxygen Sensor Or Circuit, ECM | |||||||||
| 22 | Engine Coolant Temperature Sensor Signal | ON | Engine Coolant Temp. Sensor Or Circuit, ECM | |||||||||
| 24 | Intake Air Temperature Sensor Signal | ON (3) | Intake Air Temp. Sensor Or Circuit, ECM | |||||||||
| 25 | Lean Air/Fuel Mixture | ON | Loose Ground, Injector Or Circuit, Oxygen Sensor Or Circuit, Fuel Pressure, Ignition System, Engine Coolant Temp. Sensor, MAP Sensor, ECM | |||||||||
| 26 (4) | Rich Air/Fuel Mixture | ON | Loose Ground, Injector Or Circuit, Oxygen Sensor Or Circuit, Fuel Pressure, Engine Coolant Temp. Sensor, MAP Sensor, Compression Pressure, ECM | |||||||||
| 31 | Vacuum Sensor Signal | ON | MAP Sensor Or Circuit, ECM | |||||||||
| 41 | Throttle Position Sensor Signal | ON (3) | Throttle Position Sensor Or Circuit, ECM | |||||||||
| 42 | Vehicle Speed Sensor Signal | OFF | Vehicle Speed Sensor Or Circuit, ECM | |||||||||
| 43 | Starter Signal | OFF | Starter Signal Circuit, Ignition Switch Or Circuit, ECM | |||||||||
| 51 | Switch Signal | OFF | A/C Switch Circuit, Park/Neutral Switch Or Circuit, TPS Or Circuit, ECM | |||||||||
| 71 (4) | EGR System Malfunction | ON | EGR System, EGR Temp. Sensor Or Circuit, EGR-VSV, ECM | |||||||||
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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.