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 MANUALSTOYOTA19904RUNNER 2D UTILITY, 2.4 R, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EFI
1990 Toyota 4Runner 2D Utility, 2.4 R, Automatic
Engine Controls - System/Component Tests - EFI
1990 Toyota 4Runner 2D Utility, 2.4 R, AutomaticSECTION Engine Controls - System/Component Tests - EFI
- Introduction
- Sensors & Switches
- Airflow Meter & Sensor Test
- Coolant Temperature Sensor Test
- Coolant Temperature Switch (3VZ-E) Test
- EGR Gas Temperature Sensor Test
- Knock Sensor Test
- Neutral/Start Switch Test
- Oxygen Sensor Feedback Voltage Test
- Sub-Oxygen Sensor Test
- Oxygen Sensor Heater Test
- Throttle Position (TP) Sensor Test
- Vehicle Speed Sensor (Analog Type) Test
- 4WD Switch Test
- Modules, Motors, Relays & Solenoids
- Fuel Systems
- Idle Control System
- Ignition System
- Emission Systems & Sub-Systems
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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.