Fuel Pump Control Circuit

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 crankshaft position sensor (REF), 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.

Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 1 second.
Engine running and cranking Operates.
When engine is stopped Stops in 1.5 seconds.
Except as shown above Stops.




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
Specification data are reference values.

EC-F/PUMP-01:

EC-F/PUMP-01 Connector View:

Wiring Diagram

M17, M18, M19, E89, E87, E83, B5:

ECM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND 48:

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9:

Step 10:

Diagnostic Procedure