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 DX, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCOMPUTER CONTROL SYSTEM
1988 Toyota Corolla DX, 4D Sedan, Automatic
Computer Control System
1988 Toyota Corolla DX, 4D Sedan, AutomaticSECTION Computer Control System
- Description
- Operation
- Notes
- Electronic Fuel Injection (EFI)
- Data Sensors
- Notes
- A/C Switch
- Airflow Sensor
- Air Temperature Sensor
- Cold Start Injector Time Switch
- Coolant Temperature Sensor
- Coolant Temperature Switch
- EGR Gas Temperature Sensor
- Engine Speed
- Knock Sensor
- Neutral/Start Switch
- Oxygen (O2) Sensor
- Sub-Oxygen Sensor (Calif. Only)
- Throttle Position Sensor (TPS)
- Turbo Pressure Sensor
- Vehicle Speed Sensor (VSS)
- 4WD Switch
- Electronic Control Unit (Ecu)
- Diagnostic System
- Component Locations
- Diagnosis & Testing
- Diagnostic Charts
- Diagnostic Circuit Check
- Ecu Pin Voltage Test
- No. 1 Test Ecu (+B) Circuit
- No. 2 Test, Ecu Power Source
- No. 3 Test, Code 12, 13, 14, Ignition & Rpm Signal
- No. 4 Test, Code 22, Coolant Temp. Sensor Signal
- No. 5 Test, Code 24, Intake Air Temp. Sensor Signal
- No. 6 Test, Code 25, 26, O2 Sensor Signal
- No. 7 Test, Code 31, Airflow Meter Signal
- No. 8 Test, Code 41, TPS Signal
- No. 9 Test, Code 43, Starter Signal
- No. 10 Test, Code 51, A/C Switch Signal
- No. 11 Test, Code 71, EGR System Signal (CALIF.)
- No. 12 Test, Injector Circuit Test
- No. 13 Test, "Check Engine" Circuit Check
- Component Testing
- Airflow Meter
- Throttle Position Sensor (TPS)
- Cold Start Injector Time Switch
- Coolant Temperature Sensor
- EGR Temperature Sensor
- Oxygen (O2) Sensor Heater
- Knock Sensor
- Oxygen Sensor
- Turbocharging Pressure Sensor
- Turbocharging Pressure Vacuum Switching Valve (VSV)
- Vehicle Speed Sensor
- Fuel-Cut Rpm
- Neutral/Start Switch
- Wiring Diagrams
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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.