Sfi System Sub Tank Fuel Pump Control Circuit

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SUB FUEL TANK VSV)

INSPECT FFV RELAY

CHECK HARNESS AND CONNECTOR (FFV RELAY - IGN FUSE)

CHECK HARNESS AND CONNECTOR (FFV RELAY - INTEGRATION RELAY)

CHECK HARNESS AND CONNECTOR (ECM - FFV RELAY)

CHECK HARNESS AND CONNECTOR (FFV RELAY - FUEL PUMP (FOR FUEL SUB TANK))

INSPECT FUEL PUMP (FOR FUEL SUB TANK)

CHECK HARNESS AND CONNECTOR (FUEL PUMP (FOR FUEL SUB TANK) - BODY GROUND)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

SFI SYSTEM - Sub Tank Fuel Pump Control Circuit


DESCRIPTION

A Flexible Fuel Vehicle (FFV) is a vehicle with an engine that can be used with a high concentration of ethyl alcohol fuel.
This FFV uses a sub tank system, which allows fuel (with a gasoline concentration of 78% or more) to be injected to the fuel delivery spacer from the sub tank when the ambient temperature is low to enhance low-temperature startability.
The fuel volume is controlled by the ECM and varies depending on the duty ratio of the fuel injection volume control solenoid valve assembly.
If the fuel injection volume control solenoid valve assembly is stuck open, the fuel cut solenoid valve assembly will operate and cut the fuel flow based on signals from the ECM, preventing the fuel from being drawn out of the sub tank due to vacuum from the engine.

WIRING DIAGRAM

Refer to DTC P1001 (HILUX_TGN26 RM0000033SK00KX_02.html).

INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (SUB FUEL TANK VSV)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Sub Fuel Tank VSV.

  1. Check whether the sub tank fuel pump operation sound occurs when performing the Active Test on the tester.

    HINT:
    The test is possible only once because the engine may be damaged if sub tank fuel flows into the cylinders.
    OK:
    Sub tank fuel pump operating sound occurs.

    Result:

    Condition
    		Proceed to
    NG
    		A
    OK
    (When troubleshooting according to Problem Symptoms Table)
    		B
    OK
    (When troubleshooting according to DTC chart)
    		C


B
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (HILUX_TGN26 RM000003S3U03JX.html)

C
RETURN TO ORIGINAL INSPECTION FLOW BECAUSE CHECK RESULT IS NORMAL
A


2.INSPECT FFV RELAY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System.Sfi System Sub Tank Fuel Pump Control Circuit

  1. Remove the FFV relay from the engine room relay block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Battery voltage is not applied between terminals 1 and 2
    		10 kΩ or higher
    3 - 5
    		Battery voltage is applied between terminals 1 and 2
    		Below 1 Ω

  1. Reinstall the FFV relay.



NG
REPLACE FFV RELAY
OK


3.CHECK HARNESS AND CONNECTOR (FFV RELAY - IGN FUSE)

  1. Remove the FFV relay from the engine room relay block.

  1. Remove the IGN fuse from the instrument panel junction block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (2) - IGN fuse terminal (2)
    		Always
    		Below 1 Ω

  1. Reinstall the IGN fuse.

  1. Reinstall the FFV relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FFV RELAY - IGN FUSE)
OK


4.CHECK HARNESS AND CONNECTOR (FFV RELAY - INTEGRATION RELAY)

  1. Remove the FFV relay from the engine room relay block.

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

  1. Disconnect the integration relay connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (5) - 1J-5
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (5) or 1J-5 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the FFV relay.

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FFV - INTEGRATION RELAY)
OK


5.CHECK HARNESS AND CONNECTOR (ECM - FFV RELAY)

  1. Disconnect the ECM connector.

  1. Remove the FFV relay from the engine room relay block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G146-11 (FFR) - FFV relay terminal (1)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G146-11 (FFR) or FFV relay terminal (1) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the FFV relay.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FFV RELAY)
OK


6.CHECK HARNESS AND CONNECTOR (FFV RELAY - FUEL PUMP (FOR FUEL SUB TANK))

  1. Remove the FFV relay from the engine room relay block.

  1. Disconnect the fuel pump (for fuel sub tank) connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (3) - A71-2
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    FFV relay terminal (3) or A71-2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the fuel pump (for fuel sub tank) connector.

  1. Reinstall the FFV relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FFV RELAY - FUEL PUMP (FOR FUEL SUB TANK))
OK


7.INSPECT FUEL PUMP (FOR FUEL SUB TANK)

  1. Inspect the fuel pump (for fuel sub tank) (HILUX_TGN26 RM0000033XI00DX.html).



NG
REPLACE FUEL PUMP (FOR FUEL SUB TANK) (HILUX_TGN26 RM0000033XK010X.html)
OK


8.CHECK HARNESS AND CONNECTOR (FUEL PUMP (FOR FUEL SUB TANK) - BODY GROUND)

  1. Disconnect the fuel pump (for fuel sub tank) connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    A71-1 - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the fuel pump (for fuel sub tank) connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP (FOR FUEL SUB TANK) - BODY GROUND)
OK


9.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

  1. Disconnect the ECM connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C98-11 (E01) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BODY GROUND)
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)