Sfi System 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 (OPERATE C/OPN RELAY)

INSPECT NO. 1 INTEGRATION RELAY (C/OPN AND MAIN)

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY [C/OPN] - ECM)

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - INTEGRATION RELAY [C/OPN])

CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY [C/OPN] - FUEL PUMP)

CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

INSPECT FUEL PUMP

CHECK ECM POWER SOURCE CIRCUIT

SFI SYSTEM - Fuel Pump Control Circuit


DESCRIPTION

When the engine is cranked, current flows from terminal ST1 of the ignition switch to the starter relay coil and current also flows to terminal STA of the ECM (STA signal).
When the STA signal and NE signal are input to the ECM, Tr is turned on, current flows to the coil of the circuit opening relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr on (circuit opening relay on) and the fuel pump continues operating.

WIRING DIAGRAM


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


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 (OPERATE C/OPN RELAY)

  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 / Control the Fuel Pump / Speed.

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

    OK:
    Fuel pump operating sound occurs.


NG
Go to step 2
OK

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

2.INSPECT NO. 1 INTEGRATION RELAY (C/OPN AND MAIN)

  1. Inspect the No. 1 integration relay (C/OPN) (HILUX_TGN26 RM000003BLB022X_01_0018.html).

  1. Inspect the integration relay (MAIN) (HILUX_TGN26 RM000003BLB022X_01_0019.html).



NG
REPLACE NO. 1 INTEGRATION RELAY (C/OPN AND MAIN)
OK


3.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY [C/OPN] - ECM)

  1. Disconnect the ECM connector.

  1. Remove the integration relay (C/OPN) 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
    1J-7 - G146-25 (FC)
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    1J-7 or G146-25 (FC) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay (C/OPN).



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY [C/OPN] - ECM)
OK


4.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - INTEGRATION RELAY [C/OPN])

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

  1. Disconnect the integration relay connector.

  1. Disconnect the ignition switch assembly connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G9-6 (IG2) - 1J-6
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G9-6 (IG2) or 1J-6 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ignition switch assembly connector.

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - INTEGRATION RELAY [C/OPN])
OK


5.CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY [C/OPN] - FUEL PUMP)

  1. Disconnect the fuel pump connector.

  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
    1J-8 - L4-4
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    1J-8 or L4-4 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the integration relay connector.

  1. Reinstall the integration relay.

  1. Reconnect the fuel pump connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY [C/OPN] - FUEL PUMP)
OK


6.CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

  1. Disconnect the fuel pump connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L4-5 - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the fuel pump connector.



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


7.INSPECT FUEL PUMP

  1. Inspect the fuel pump (HILUX_TGN26 RM000000YLJ01NX.html).



NG
REPLACE FUEL PUMP (HILUX_TGN26 RM000000YLL055X.html)
OK


8.CHECK ECM POWER SOURCE CIRCUIT

  1. Check the ECM power source circuit (HILUX_TGN26 RM000002769099X.html).



NG
REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)