Fuel Pump

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-II Reference Value In Data Monitor Mode:

ECM Terminals And Reference Value:

EC-F/PUMP-01:

EC-F/PUMP-01 Connector View:

WIRING DIAGRAM

Super Multiple Junction Terminal Arrangements:

Joint Connector Terminal Arrangements:

Steps 1 - 2:

Steps 3 - 4:

Steps 5 - 7:

Steps 8 - 10:

Steps 11 - 12:

Diagnostic Procedure

Component Inspection

FUEL PUMP RELAY







Check continuity between terminals 3 and 5.




FUEL PUMP
1. Disconnect fuel pump harness connector.
2. Check resistance between terminals 2 and 3.
Resistance: 0.2 - 5.0 ohm [at 25 °C (77 °F)]
If NG, replace fuel pump.







INERTIA FUEL SHUTOFF SWITCH
1. Disconnect inertia fuel shutoff switch harness connector.
2. Check inertia fuel shutoff switch, following the table as shown.