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 MANUALSTOYOTA1992CAB & CHASSIS STANDARD, R150REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - V6FUEL SYSTEMFUEL PUMP CONTROL CIRCUITEFI MAIN RELAY
1992 Toyota Cab & Chassis Standard, R150
EFI Main Relay
1992 Toyota Cab & Chassis Standard, R150SECTION EFI Main Relay
- The EFI fuse supplies constant battery voltage to EFI main relay. EFI main relay provides battery voltage to +B terminal of circuit opening relay and engine check connector.
- Depending on model, EFI main relay may either be turned on directly by ignition switch or by M-REL terminal of Electronic Control Unit (ECU).
- Fuel pump should operate with jumper wire between +B and FP terminals of engine check connector and ignition on. If fuel pump does not operate, check EFI main relay and wiring circuit. See SYSTEM & COMPONENT TESTING article for testing of EFI main relay. See WIRING DIAGRAMS article in ENGINE PERFORMANCE for wiring circuit.
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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.