Fuel Pump

System Description

System Description:

The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine startability. If the ECM receives a 120° signal from the camshaft position sensor, it knows that the engine is rotating, and causes the pump to operate. If the 120° signal is not received when the ignition switch is on, the engine stalls. The ECM stops pump operation and prevents battery discharging, thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump.

Component Description



The fuel pump with a fuel damper is an in-tank type (the pump and damper are located in the fuel tank).

CONSULT Reference Value in Data Monitor Mode

CONSULT Reference Value In Data Monitor Mode:

Specification data are reference values.

ECM Terminals and Reference Value

ECM Terminals And Reference Value:

Specification data are reference values and are measured between each terminal and 32 (ECM ground).

Wiring Diagram

EC-F/PUMP-01:

Main Harness, Engine Room, And Body Harness Connector Views:

Fuse Block J/B Connector Views:

Diagnostic Procedure

Steps 1 - 2:

Steps 3 - 5:

Steps 6 - 8:

Steps 9 - 10:

Component Inspection

FUEL PUMP RELAY







- Check continuity between terminals 3 and 5.

- If NG, replace relay.

FUEL PUMP



1. Disconnect fuel pump harness connector.
2. Check resistance between terminals 1 and 2.

Resistance: 0.2 - 5.0 Ohms [at 25°C; (77°F)]

If NG, replace fuel pump.