Fuel Pump

SYSTEM DESCRIPTION
The PCM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine startability. If the PCM receives a 180 ° signal from the camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to perform. If the 180 ° signal is not received when the ignition switch is on, the engine stalls. The PCM stops pump operation and prevents battery discharging, thereby improving safety. The PCM 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.

CONSULT-II Reference Value In Data Monitor Mode:

EC-F/PUMP-01:

EC-F/PUMP-01 - Connector View:

WIRING DIAGRAM




PCM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND GROUND.

CAUTION: DO NOT USE PCM GROUND TERMINALS WHEN MEASURING INPUT/OUTPUT VOLTAGE. DOING SO MAY RESULT IN DAMAGE TO THE PCM'S TRANSISTOR. USE A GROUND OTHER THAN PCM TERMINALS, SUCH AS THE GROUND.

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

Step 7:

Step 8:

Step 9:

Step 10:

Step 11:

Step 12:

DIAGNOSTIC PROCEDURE

COMPONENT INSPECTION







FUEL PUMP RELAY
Check continuity between terminals 3 and 5.

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.