Fuel Pump

FUEL PUMP

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 engine speed signal from the crankshaft position sensor (POS) and camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. If the engine speed 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




A turbine type design fuel pump is used in the fuel tank.
- Fuel level sensor unit and fuel pump (1)
- Fuel pressure regulator (2)
- Fuel level sensor (3)
- Fuel tank temperature sensor (4)




CONSULT-II Reference Value in Data Monitor Mode

EC-F/PUMP-01:

Wiring Diagram

Diagrams: Other diagrams referred to by name within these diagrams can be found at Diagrams By Diagram Name. Diagrams By Diagram Name

Step 1-3:

Step 4-8:

Step 8 (Continued)-11:

Diagnosis Procedure

Component Inspection

FUEL PUMP
1. Disconnect "fuel level sensor unit and fuel pump" harness connector.




2. Check resistance between "fuel level sensor unit and fuel pump" terminals 1 and 3.

Resistance: Approximately 0.2 - 5.0 ohms [at 25 °C (77 °F)]

3. If NG, replace "fuel level sensor unit and fuel pump".