Fuel Pump Control Circuit

Fuel Pump Control Circuit

DESCRIPTION

The fuel pump is operated by the engine control system according to the vehicle running condition. After the engine control system receives the engine start requirement signal from the HV control system, an NE signal comes in immediately when the engine is cranked by MG1 (basically, the fuel pump can operate while the NE signal is generated).

The engine control system grounds the FC terminal line after receiving NE signal. It causes to energize the coil in the circuit opening relay, and the current flows to the fuel pump.

When the signal to stop the engine comes from the HV control system to the engine control system, or when the fuel cut operation is performed such as decelerating by the engine brake, the fuel pump is stopped.

Wiring Diagram:

Step 1:

Step 1(continued)-4:

Step 5-6:

Step 7:

INSPECTION PROCEDURE