Quote Originally Posted by jick.cejoco View Post
still wrong sir. on older toyota, they have "luft" type or "L" type fuel injection where it uses a vane or flap type airflow meter which has a mechanical switch in the airflow mete that closes if there is airflow that deflects the vane other than fully closed position. before there is sufficient airflow, the ecu, as what toyota called it before, "enables" the circuit open relay for two to three seconds to pre-pressurize the fuel rail. so, on the toyota you mentioned, the fuel pump is enabled two ways, KOEO (key on engine off) runs for 2-3 seconds and the closing of the FC (fuel pump control) terminal of the airflow meter against E1 (earth 1 or engine ground) thereby closing the circuit to the circuit open relay to close the +B to FP (fuel pump positive lead)
Pre-OBD-II Toyotas with MAP fuel metering do not have that pre-pressurization of the fuel rail.