Toyota Repair Problems? Ask a Mechanic for Answers ASAP
OBD II access port are only available for 1996 and later models. The vehicle should be equipped with a DLC ( Data Link Connector) for diagnostics.
Here are the procedures for testing the fuel pump.
FUEL PUMP OPERATION
1. Install Jumper Wire between +B and FP terminals of data link connector. Data link connector is located in engine compartment.
2. Turn ignition on. Listen for fuel pump operating sound and feel for pressure in fuel line near fuel filter. Turn ignition off. Remove jumper wire. If fuel pump operates, check fuel pressure.
3. If fuel pump does not operate, connect a jumper wire from positive battery terminal to FP terminal of data link connector. If fuel pump operates, EFI main relay, EFI No. 2 relay, circuit opening relay or fuel pump relay may be defective.
4. If relays are okay, check wiring circuit and fuses. If fuel pump does not operate, check for defective fuel pump, open circuit between data link connector and fuel pump, or defective fuel pump ground.
By applying voltage to the FP terminal, the fuel pump is being energized directly. If the fuel pump does not work, either the fuel pump or its wiring is bad. you would have to check on that.
Thanks for the ACEPT and compliments.
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Give the fuel tank some slight knock and you might get the fuel pump running. If it runs, though it might not last, it can at least get the engine started to let you move the vehicle if required and can eliminate the process of checking the wiring for faults.
When there are any questions left, it means my job is not done yet. You must be refering to the fuel pump resistor which carries only 2 wires.
There are 2 relays that controls the fuel pump. Attached is a diagram for your understanding of the system. Had to break them down to be legible.
Ok Jack, till then.
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