When the STA signal and NE signal are input to the ECM, Tr is turned on, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates. While the NE signal is generated (engine running), the ECM keeps Tr on (circuit opening relay on) and the fuel pump also keeps operating. WIRING DIAGRAM DIAGNOSTICS ENGINE (5VZ–FE). INSPECTION PROCEDURE.
