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.

Condition Fuel pump operation
Ignition switch is turned to ON. Operates for 5 seconds
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 Reference Value in Data Monitor Mode
Specification data are reference values.




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

EC-F/PUMP-01:

EC-F/PUMP-01 Connectors View:

Wiring Diagram

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9:

Step 10:

Diagnostic Procedure

Component Inspection




FUEL PUMP RELAY
Check continuity between terminals 3 and 5.

Conditions Continuity
12V direct current supply between terminals 1 and 2 Yes
No current supply No

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.