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 MANUALSTOYOTA1994COROLLA DX, 4D WAGON, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODESTROUBLE CODE DIAGNOSTIC HINTS
1994 Toyota Corolla DX, 4D Wagon, Automatic
Trouble Code Diagnostic Hints
1994 Toyota Corolla DX, 4D Wagon, AutomaticSECTION Trouble Code Diagnostic Hints
NOTE:
To determine a common cause for a trouble code to be set, see TROUBLE CODE DIAGNOSTIC HINTS table.
TROUBLE CODE DIAGNOSTIC HINTS (1)
| Trouble Code | Diagnostic Hints | ||||
|---|---|---|---|---|---|
| 12 | No "G", "G1", "G2" or "NE" Ignition Signal To ECM Within 2 Seconds After Engine Is Cranked, No "G" Ignition Signal To ECM For 3 Seconds With Engine Speed Of 600-4000 RPM Open In "G-" Circuit | ||||
| 13 | No "NE" Ignition Signal To ECM When Engine Speed Is Greater Than Approximately 1000 RPM, No "G" Ignition Signal To ECM When "NE" Signal Is Input 4 Times With Engine Speed Of 600-4000 RPM | ||||
| 14 | No "IG" Or "IGF" Ignition Signal To ECM From Ignitor Several Times In Succession | ||||
| 16 | Fault In Transmission/Transaxle ECU Or ECM | ||||
| 21 | Defective O2 Sensor, Open Or Short Circuit In O2 Sensor Signal | ||||
| 22 | Open Or Short Circuit In Engine Coolant Temp. Sensor Signal | ||||
| 24 | Open Or Short Circuit In Intake Air Temp. Sensor Signal | ||||
| 25 | Lean Signal Sent By O2 Sensor For Several Seconds | ||||
| 26 | Rich Signal Sent By O2 Sensor For Several Seconds | ||||
| 27 | Open Or Short Circuit In Sub-O2 Sensor Signal | ||||
| 28 | Defective O2 Sensor, Open Or Short Circuit In O2 Sensor Signal | ||||
| 31 | Open Or Short Circuit In Airflow Meter Or MAP Sensor Signal | ||||
| 32 | Open Or Short Circuit Between Airflow Meter Terminals | ||||
| 34 | Turbocharger Pressure Is Abnormal | ||||
| 35 | Open Or Short Circuit In Turbocharging Pressure Sensor, MAP Sensor Or BARO Sensor | ||||
| 41 | Open Or Short Circuit In Throttle Position Sensor Signal | ||||
| 42 | No Signal From Vehicle Speed Sensor For Several Seconds | ||||
| 43 | No "STA" Signal To ECM Until Engine Reaches 800 RPM With Engine Cranking | ||||
| 47 | Open Or Short Circuit In Sub-Throttle Position Sensor Signal | ||||
| 51 | (2) Problem In One Of 3 Circuits Monitored By ECM | ||||
| 52 | Open Or Short Circuit In Knock Sensor Signal | ||||
| 53 | Knock Control In ECM Is Faulty | ||||
| 55 | Open Or Short Circuit In Knock Sensor Signal | ||||
| 71 | EGR Gas Temp. Less Than Predetermined Level During EGR Control | ||||
| 78 | Open Or Short Circuit In Fuel Pump Control Circuit Or Fuel Pump Electronic Control Unit (ECU) | ||||
| 81 | Open In ECT1 Circuit Between ECM & Trans. Control Module (TCM) For At Least 2 Seconds | ||||
| 83 | Open In ESA1 Circuit Between ECM & Trans. Control Module (TCM) For 1/2 Second After Engine Idles At Least 1/2 Second | ||||
| 84 | Open In ESA2 Circuit Between ECM & Trans. Control Module (TCM) For 1/2 Second After Engine Idles At Least 1/2 Second | ||||
| 85 | Open In ESA3 Circuit Between ECM & Trans. Control Module (TCM) For 1/2 Second After Engine Idles At Least 1/2 Second | ||||
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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.