Fuel pump prime and power are both on the same line Blue/Black is POS. White/Black is GROUND. Follow the jumper test below to check the pump.
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.
1. 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).
2. 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.
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.
1. Starter signal energizes circuit opening relay during cranking. The circuit opening relay then provides voltage to the fuel pump.
2. On Camry 2.2L circuit opening relay is grounded by the ECU through the FC terminal.
Sunday, February 5th, 2017 AT 8:15 PM