GSIC - Global Service Information Center

### SFI SYSTEM > Fuel Pump Control Circuit

## for Preparation Click here

## DESCRIPTION

Refer to DTC P0230 (Click here).

## WIRING DIAGRAM

Refer to DTC P0230 (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 10

NG |

2.PERFORM ACTIVE TEST (OPERATE OF CIRCUIT OPENING RELAY)

1. Connect the intelligent tester to the DLC3.

1. Turn the ignition switch ON and turn the tester ON.

1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Fuel Pump / Speed.

1. Check whether operating sounds can be heard while operating the relay using the relay.

   OK:
     Operating noise can be heard from the relay.

| OK |

Go to step 5

NG |

3.INSPECT INTEGRATION RELAY (C/OPN RELAY)

1. Remove the integration relay from the engine room junction block.

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

   Standard voltage:

     Terminal Connection | Condition | Specified Condition
     1J-8 - Body ground | Ignition switch ON | 10 to 14 V

| NG |

REPLACE INTEGRATION RELAY

OK |

4.INSPECT ECM (FC VOLTAGE)

1. Turn the ignition switch ON.

1. Measure the voltage of the ECM connectors.

   Standard voltage:
   Tester Connection | Specified Condition
   E14-10 (FC) - E17-1 (E1) | 9 to 14 V

| OK |

REPLACE ECM

NG |

CHECK AND REPAIR HARNESS AND CONNECTOR (ECM - INTEGRATION RELAY, INTEGRATION RELAY - IGNITION SWITCH)

5.INSPECT ECM POWER SOURCE CIRCUIT

| NG |

REPAIR OR REPLACE

OK |

6.INSPECT RELAY (Marking: F/PMP)

1. Remove the F/PMP relay from the engine room relay block.

1. Measure the resistance of the relay.

   Standard resistance:

     Tester Connection | Specified Condition
     3 - 4 | Below 1 Ω
     3 - 5 | 10 kΩ or higher
     3 - 4 | 10 kΩ or higher (when battery voltage applied to terminals 1 and 2)
     3 - 5 | Below 1 Ω (when battery voltage applied to terminals 1 and 2)

| NG |

REPLACE RELAY

OK |

7.INSPECT FUEL PUMP

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 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 the fuel pump as far away from the battery as possible.
3. Always perform the switching at the battery side.

| NG |

REPLACE FUEL PUMP

OK |

8.CHECK WIRE HARNESS (FUEL PUMP - F/PMP RELAY, FUEL PUMP - BODY GROUND)

1. Check the wire harness between the fuel pump and fuel pump relay.

   1. Disconnect the F15 fuel pump connector.

   2. Remove the F/PMP relay from the engine room relay block.

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

      Standard resistance:

        Tester Connection | Specified Condition
        F15-5 - Body ground | Below 1 Ω
        F15-4 or F/PMP relay (4) - Body ground | 10 kΩ or higher

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

   1. Disconnect the F15 fuel pump connector.

   2. Measure the resistance of the wire harness side connector.

      Standard resistance:

        Tester Connection | Specified Condition
        F15-5 - Body ground | Below 1 Ω

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

9.CHECK WIRE HARNESS (INTEGRATION RELAY - F/PMP RELAY)

1. Disconnect the 1J integration relay connector from the engine room junction block.

1. Remove the F/PMP relay from the engine room relay block.

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

   Standard resistance:

     Tester Connection | Specified Condition
     1J-8 - Fuel pump relay (3) | Below 1 Ω
     1J-8 or Fuel pump relay (3) - Body ground | 10 kΩ or higher

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

CHECK AND REPAIR INTEGRATION RELAY

10.INSPECT RELAY (Marking: F/PMP)

1. Remove the F/PMP relay from the engine room relay block.

1. Measure the resistance of the relay.

   Standard resistance:

     Tester Connection | Specified Condition
     3 - 4 | Below 1 Ω
     3 - 5 | 10 kΩ or higher
     3 - 4 | 10 kΩ or higher (when battery voltage applied to terminals 1 and 2)
     3 - 5 | Below 1 Ω (when battery voltage applied to terminals 1 and 2)

| NG |

REPLACE RELAY

OK |

11.INSPECT FUEL PUMP RESISTOR (RESISTANCE)

1. Inspect the fuel pump resistor resistance.

   1. Measure the resistance.

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

| NG |

REPLACE FUEL PUMP RESISTOR

OK |

12.CHECK WIRE HARNESS (F/PMP RELAY - FUEL PUMP RESISTOR, FUEL PUMP RESISTOR - FUEL PUMP)

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

   1. Remove the fuel pump relay from the engine room relay block.

   2. Disconnect the F20 fuel pump resistor connector.

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

      Standard resistance:

        Tester Connection | Specified Condition
        F/PMP relay (5) - F20-1 (+B) | Below 1 Ω
        F/PMP relay (5) or F20-1 (+B) - Body ground | 10 kΩ or higher

1. Check the wire harness between the fuel pump relay and fuel pump.

   1. Disconnect the F20 fuel pump resistor connector.

   2. Disconnect the F15 fuel pump connector.

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

      Standard resistance:

        Tester Connection | Specified Condition
        F20-2 (FP) - F15-4 | Below 1 Ω
        F20-2 (FP) or F15-4 - Body ground | 10 kΩ or higher

| OK |

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR