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 MANUALSTOYOTA1992PICKUP BASE, W55REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - 4-CYLFUEL SYSTEMFUEL PUMP CONTROL CIRCUITCIRCUIT OPENING RELAY
1992 Toyota Pickup Base, W55
Circuit Opening Relay
1992 Toyota Pickup Base, W55SECTION Circuit Opening Relay
- Circuit opening relay controls fuel pump circuit. The Electronic Control Unit (ECU) receives an input signal at STA terminal when engine is cranking. Starter signal is also applied to terminal STA of circuit opening relay.
- Starter signal energizes circuit opening relay during cranking. The circuit opening relay then provides voltage to the fuel pump or fuel pump relay. Fuel pump relay is used on Celica 2.0L Turbo, MR2 2.0L Turbo and.
- On all models except Camry 2.2L, Celica, Corolla, MR2, Paseo, and Tercel, fuel pump switch in airflow meter provides the ground for circuit opening relay. On all other models, circuit opening relay is grounded by the ECU through the FC terminal.
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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.