Sfi System Fuel Pump Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

When using intelligent tester:

PERFORM ACTIVE TEST (OPERATE C/OPN RELAY)

CHECK ECM POWER SOURCE CIRCUIT

CHECK ECM (FC VOLTAGE)

CHECK INTEGRATION NO.1 RELAY (C/OPN RELAY)

INSPECT FUEL PUMP

CHECK HARNESS AND CONNECTOR (FUEL PUMP - INTEGRATION RELAY (C/OPN RELAY) AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (C/OPN RELAY) - ECM AND BODY GROUND)

When not using intelligent tester:

INSPECT OPERATION OF FUEL PUMP

CHECK ECM POWER SOURCE CIRCUIT

CHECK ECM (FC VOLTAGE)

CHECK INTEGRATION NO.1 RELAY (C/OPN RELAY)

INSPECT FUEL PUMP

CHECK HARNESS AND CONNECTOR (FUEL PUMP - INTEGRATION RELAY (C/OPN RELAY) AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (C/OPN RELAY) - ECM AND BODY GROUND)

SFI SYSTEM - Fuel Pump Control Circuit


DESCRIPTION

When the engine is cranked, current flows from terminal ST2 of the ignition switch to the starter relay (Marking: ST) coil, and current also flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are transmitted to the ECM, the power transistor (Tr) is turned ON, current flows to the circuit opening relay (Marking: C/OPN) coil, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (when engine is running), the ECM keeps Tr ON (circuit opening relay ON) and the fuel pump also keeps operating.

Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit


WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit


INSPECTION PROCEDURE


When using intelligent tester:

1.PERFORM ACTIVE TEST (OPERATE C/OPN RELAY)

  1. Connect the intelligent tester to the DLC3.

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

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

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

    OK:
    Operating noise can be heard from the fuel pump.


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


2.CHECK ECM POWER SOURCE CIRCUIT

  1. Check the ECM Power Source Circuit (Toyota Fortuner RM000000ZQP00BX.html).



NG
REPAIR OR REPLACE POWER SOURCE CIRCUIT
OK


3.CHECK ECM (FC VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E8-25 (FC) - E11-3 (E1)
    		9 to 14 V


NG
Go to step 7
OK


4.CHECK INTEGRATION NO.1 RELAY (C/OPN RELAY)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

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

    Standard voltage:
    Terminal Connection
    		Condition
    		Specified Condition
    1J-8 - Body ground
    		Engine cranking
    		10 to 14 V


NG
REPLACE INTEGRATION NO.1 RELAY
OK


5.INSPECT FUEL PUMP

  1. Inspect the fuel pump (Toyota Fortuner RM000000YLJ009X_01_0001.html).



NG
REPLACE FUEL PUMP
OK


6.CHECK HARNESS AND CONNECTOR (FUEL PUMP - INTEGRATION RELAY (C/OPN RELAY) AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

  1. Disconnect the 1J integration relay connector.

  1. Disconnect the F14 fuel pump connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-8 - F14-4
    		Below 1 Ω
    F14-5 - Body ground
    		Below 1 Ω
    1J-8 or F14-4 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM

7.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (C/OPN RELAY) - ECM AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

  1. Disconnect the 1J integration relay connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1J-6 - Body ground
    		Ignition switch ON
    		9 to 14 V

  1. Disconnect the E8 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-7 - E8-25 (FC)
    		Below 1 Ω
    1J-7 or E8-25 (FC) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM


When not using intelligent tester:

1.INSPECT OPERATION OF FUEL PUMP

  1. Check the operation of the fuel pump.



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


2.CHECK ECM POWER SOURCE CIRCUIT

  1. Check the ECM Power Source Circuit (Toyota Fortuner RM000000ZQP00BX.html).



NG
REPAIR OR REPLACE POWER SOURCE CIRCUIT
OK


3.CHECK ECM (FC VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E8-25 (FC) - E11-3 (E1)
    		9 to 14 V


NG
Go to step 7
OK


4.CHECK INTEGRATION NO.1 RELAY (C/OPN RELAY)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1J-8 - Body ground
    		Engine cranking
    		10 to 14 V


NG
REPLACE INTEGRATION NO.1 RELAY
OK


5.INSPECT FUEL PUMP

  1. Inspect the fuel pump (Toyota Fortuner RM000000YLJ009X_01_0001.html).



NG
REPLACE FUEL PUMP
OK


6.CHECK HARNESS AND CONNECTOR (FUEL PUMP - INTEGRATION RELAY (C/OPN RELAY) AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Disconnect the 1J integration relay connector from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

  1. Disconnect the F14 fuel pump connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-8 - F14-4
    		Below 1 Ω
    F14-5 - Body ground
    		Below 1 Ω
    1J-8 or F14-4 - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM

7.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY (C/OPN RELAY) - ECM AND BODY GROUND)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Fuel Pump Control Circuit

  1. Remove the integration relay from the engine room junction block (Toyota Fortuner RM0000014TJ00WX.html).

  1. Disconnect the 1J integration relay connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1J-6 - Body ground
    		Ignition switch ON
    		9 to 14 V

  1. Disconnect the E8 ECM connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    1J-7 - E8-25 (FC)
    		Below 1 Ω
    1J-7 or E8-25 (FC) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM