Fuel Pump Control Circuit [01/2014 - ]: Description

When the engine is cranked, the starter relay drive signal output from the ignition switch*1 or power source control ECU*2 is input into the STA terminal of the ECM, and the NE signal generated by the crankshaft position sensor is input into the NE+ terminal. The ECM determines that the engine is cranked, and turns transistor Tr1 in the ECM internal circuit on. Current flows to the C/OPN (Circuit Opening) relay by turning Tr1 on.

Then, the fuel pump operates.

While the NE signal is input into the ECM and the engine is running, the ECM turns Tr1 on continuously.

*1: w/o Smart Key System

*2: w/ Smart Key System