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 PERFORMANCETESTING & DIAGNOSISCOMPUTER 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.