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 MANUALSTOYOTA1985CELICA SUPRA BASE, AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - A43, A44 & A46TESTINGELECTRICAL TESTINGOVERDRIVE RELAY
1985 Toyota Celica Supra Base, Automatic
Overdrive Relay
1985 Toyota Celica Supra Base, AutomaticSECTION Overdrive Relay
- Remove overdrive relay from pedal bracket (except Van). Remove console box (Van). Using an ohmmeter, ensure continuity exists between terminals No. 1 and 2 of overdrive relay. See Figure. Replace relay if continuity does not exist.
- Apply battery voltage across terminals No. 2 and 3. Using an ohmmeter, ensure continuity does not exist between terminals No. 1and 2. Apply battery voltage across terminals No. 2 and 4. See Figure. Ensure continuity does not exist at terminals No. 1 and 2. Replace relay if continuity exists. Reinstall overdrive relay to pedal bracket.
RENDER: 1.0x
NO RELATED
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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.