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-III Reference Value in Data Monitor Mode






Wiring Diagram

EC-F/PUMP-01:

Diagnosis Procedure

Step 1-3:

Step 4-8:

Step 8 (Continued)-11:

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".