Fuel Pump Control Circuit

FUEL PUMP CONTROL CIRCUIT

CIRCUIT DESCRIPTION

The fuel pump is operated by the ECM according to the vehicle running condition. After the ECM receives the engine start requirement signal from the HV control ECU, 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 ECM 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 ECU to the ECM, or when the fuel cut operation is performed such as decelerating by the engine brake, the fuel pump is stopped.

Wiring Diagram:

INSPECTION PROCEDURE

Step 1 - 3:

Step 4 - 5:

Step 6:

Hand-held tester

Step 1 - 3:

Step 4 - 5:

Step 6:

OBD II scan tool (excluding hand-held tester)