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 MANUALSTOYOTA1990TERCEL BASE, 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 4-CYL CARBURETEDAIR INJECTION SYSTEM TESTNOTES
1990 Toyota Tercel Base, 2D Coupe, Standard
Air Injection System Test: Notes
1990 Toyota Tercel Base, 2D Coupe, StandardSECTION Notes
NOTE:
Pickup (22R) is equipped with air injection.
- Inspect air pump belt. Visually check hoses and tubes for cracks, kinks, damage, or loose connections. Disconnect Air By-Pass Valve (ABV) hose from air cleaner.
- With coolant temperature less than 43°F (6°C), start engine and set at idle. Air should discharge from ABV hose. With engine at operating temperature, check operation of ABV and Air Switching Valve (ASV). Air should stop discharging from ABV hose.
- Increase engine speed and than quickly close throttle. Air should momentarily discharge from ABV hose. Increase engine speed to 3000 RPM. Air should discharge from ABV hose.
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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.