SFI SYSTEM > Fuel Pump Control Circuit

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DESCRIPTION

Refer to DTC P0230 on page Click here.

WIRING DIAGRAM

Refer to DTC P0230 on page Click here.

INSPECTION PROCEDURE

1.CHECK FUEL PUMP OPERATION

  1. Check if there is pressure in the fuel inlet hose.

    HINT:
    If there is fuel pressure, you will hear the sound of fuel flowing.



OK
Go to step 12
NG


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE CIRCUIT OPENING RELAY)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and turn the intelligent tester ON.

  1. Enter the following menus: Power train / Engine / Active Test / Control the Fuel Pump / Speed.

  1. Check the operation of the relay while operating it using the intelligent tester.

    OK:
    Operating noise can be heard from the relay.



OK
Go to step 8
NG


3.INSPECT ECM POWER SOURCE CIRCUIT


NG
REPAIR OR REPLACE POWER SOURCE CIRCUIT COMPONENTS
OK


4.INSPECT FUSE (F/PMP FUSE)
A108303E02

  1. Remove the F/PMP fuse from the engine room No. 2 relay block, junction block.

  1. Measure the resistance of the F/PMP fuse.

    Standard resistance:
    Below 1 Ω



NG
CHECK FOR SHORT IN ALL HARNESS AND COMPONENTS CONNECTED TO FUSE
OK


5.INSPECT INTEGRATION RELAY (EFI NO. 2 RELAY)
A107714E03

  1. Remove the integration relay from the engine room No. 2 junction block.

  1. Measure the resistance of the EFI NO. 2 relay.

    Standard resistance:
    Tester Connection
    		Specified Condition
    2B-4 - 2C-1
    		10 kΩ or higher
    2B-4 - 2C-1
    		Below 1 Ω
    (when battery voltage applied to terminals 2B-3 and 2B-2)



NG
REPLACE EFI NO. 2 RELAY
OK


6.INSPECT INTEGRATION RELAY (C/OPN RELAY)
A107714E03

  1. Remove the integration relay from the engine room No. 2 junction block.

  1. Measure the resistance of the C/OPN relay.

    Standard resistance:
    Tester Connection
    		Specified Condition
    2B-6 - 2B-8
    		10 kΩ or higher
    2B-6 - 2B-8
    		Below 1 Ω
    (when battery voltage applied to terminals 2B-6 and 2B-7)



NG
REPLACE INTEGRATION RELAY
OK


7.INSPECT ECM (FC VOLTAGE)
A103828E36

  1. Turn the engine switch on (IG).

  1. Measure the voltage between the terminals of the A6 and E7 ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    FC (A6-14) - E1 (E7-7)
    		9 to 14 V



OK
REPLACE ECM
NG

CHECK AND REPAIR HARNESS AND CONNECTOR (ECM - CIRCUIT OPENING RELAY) 

8.INSPECT F/PMP RELAY
A095468

  1. Remove the F/PMP relay from the engine room No. 2 relay block.

  1. Measure the resistance of the F/PMP relay.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 4
    		10 kΩ or higher
    3 - 4
    		Below 1 Ω
    (when battery voltage applied to terminals 1 and 2)



NG
REPLACE F/PMP RELAY
OK


9.INSPECT FUEL PUMP
A074356E05

  1. Inspect fuel pump resistance.

    1. Measure the resistance between terminals 4 and 5.

      Standard resistance:
      0.2 to 3.0 Ω at 20°C (68°F)

  1. Inspect fuel pump operation.

    1. Apply battery voltage to both the terminals. Check that the pump operates.

      NOTICE:
      1. These tests must be done quickly (within 10 seconds) to prevent the coil from burning out.
      2. Keep fuel pump as far away from the battery as possible.
      3. Always switch at the battery side.



NG
REPLACE FUEL PUMP
OK


10.CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY)
A108343E03

  1. Check the harness and the connectors between the fuel pump and the F/PMP relay.

    1. Disconnect the W11 fuel pump connector.

    2. Remove the F/PMP relay from the engine room No. 2 relay block.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Fuel pump (W11-4) - F/PMP relay (4)
      		Below 1 Ω

      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      Fuel pump (W11-4) or F/PMP (4) - Body ground
      		10 kΩ or higher

  1. Check the harness and the connectors between the fuel pump and the body ground.

    1. Disconnect the fuel pump connector.

    2. Measure the resistance of the wire harness side connector and the body ground.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      Fuel pump (W11-5) - Body ground
      		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


11.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - F/PMP RELAY)
A109880E01

  1. Remove the integration relay from the engine room No. 2 junction block.

  1. Remove the F/PMP relay from the engine room No. 2 junction block.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    Integration relay (2B-8) - F/PMP relay (1)
    		Below 1 Ω
    Integration relay (2B-8) - F/PMP relay (3)
    		Below 1 Ω

    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    Circuit opening relay (2B-8) or F/PMP relay (1) - Body ground
    		10 kΩ or higher
    Circuit opening relay (2B-8) or F/PMP relay (3) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPAIR OR REPLACE INTEGRATION RELAY 

12.INSPECT F/PMP RELAY
A095468

  1. Remove the F/PMP relay from the engine room No. 2 relay block.

  1. Measure the resistance of the F/PMP relay.

    Standard resistance:
    Tester Connection
    		Specified Condition
    3 - 4
    		10 kΩ or higher
    3 - 4
    		Below 1 Ω
    (when battery voltage applied to terminals 1 and 2)



NG
REPLACE F/PMP RELAY
OK


13.INSPECT FUEL PUMP RESISTOR
A072544E01

  1. Measure the resistance between terminals.

    Standard resistance:
    0.70 to 0.76 Ω at 20°C (68°F)



NG
REPLACE FUEL PUMP RESISTOR
OK


14.CHECK HARNESS AND CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTER)
A107721E04

  1. Check the harness and the connectors between the F/PMP relay and the fuel pump resistor.

    1. Remove the F/PMP relay from the engine room No. 2 relay block.

    2. Disconnect the A25 fuel pump resistor connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard resistance (Check for open):
      Tester Connection
      		Specified Condition
      F/PMP relay (4) - Fuel pump resistor (A25-2)
      		Below 1 Ω
      F/PMP relay (3) - Fuel pump resistor (A25-1)
      		Below 1 Ω

      Standard resistance (Check for short):
      Tester Connection
      		Specified Condition
      Fuel pump relay (4) or Fuel pump resistor (A25-2) - Body ground
      		10 kΩ or higher
      Fuel pump relay (4) or Fuel pump resistor (A25-1) - Body ground
      		10 kΩ or higher



OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR