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.
1989 Toyota Land CruiserFACTORY OEM SERVICE PROCEDURE
Circuit Opening Relay
- Circuit opening relay controls fuel pump circuit. ECU receives an input signal at "STA" terminal when engine is cranking. This same starter signal is also applied to terminal "STA" of circuit opening relay.
- Starter signal energizes circuit opening relay during cranking, which in turn activates the fuel pump. On all except Supra (7M-GTE), when airflow meter senses airflow to engine, fuel pump switch in airflow meter provides the relay ground. On Supra (7M-GTE), circuit opening relay is grounded by ECU through "FC" terminal.
Fuel Pump Relay & Fuel Pump Resistor (Cressida & Supra)
On these models a separate fuel pump relay and resistor are used between the circuit opening relay and the fuel pump.
NOTE:
For more information on testing relays and fuel system components, see I - EFI SYS/COMP TESTS article.
Factory Service Tools
Use the Manual With the Right Hardware
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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.