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 MANUALSTOYOTA1984CELICA GT, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISECS ENGINE CONTROL SYSTEMCOMPONENT TESTINGFUEL CUT DECELERATION SYSTEM
1984 Toyota Celica GT, 2D Hatchback, Automatic
Fuel Cut Deceleration System
1984 Toyota Celica GT, 2D Hatchback, AutomaticSECTION Fuel Cut Deceleration System
- Connect tachometer to engine. Gain access to ECU wire connectors. Start and warm engine to normal operating temperature. Using a digital voltmeter, measure voltage between terminals No. 10 or No. 20 and +B with engine at idle speed. Voltage reading should be 0.1-0.2 volts.
- Increase engine speed to 3000 RPM. Rapidly decrease engine speed. Voltmeter should temporarily register 0 volts. Fuel cutoff RPM should be as specified in chart.
- If deceleration system is difficult to verify, check by performing road test. If accurate testing was performed and system does not operate properly, check throttle position sensor. Remove test equipment and replace ECU.
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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.