Sfi System Starter Signal Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

When using intelligent tester:

READ DATA LIST (STA SIGNAL)

CHECK HARNESS AND CONNECTOR (ECM - IGNITION SWITCH)

When not using intelligent tester:

CHECK ECM (STA VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - IGNITION SWITCH)

SFI SYSTEM - Starter Signal Circuit


DESCRIPTION

When the engine is cranked, the intake air flow becomes slow, so fuel vaporization is poor. A rich mixture is therefore necessary in order to achieve good startability. While the engine is being cranked, the battery voltage is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection volume for starting and after-start injection control.

WIRING DIAGRAM


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


INSPECTION PROCEDURE


When using intelligent tester:

1.READ DATA LIST (STA SIGNAL)

  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 / Data List / Starter Signal.

  1. Check the result when the ignition switch is turned to ON and START.

    Result:
    Ignition Switch Position
    		STA Signal
    ON
    		OFF
    START
    		ON


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


2.CHECK HARNESS AND CONNECTOR (ECM - IGNITION SWITCH)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Starter Signal Circuit

  1. Disconnect the E8 ECM connector.

  1. Disconnect the I8 ignition switch connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-12 (STA) - I8-7 (ST2)
    		Below 1 Ω
    E8-12 (STA) or I8-7 (ST2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM


When not using intelligent tester:

1.CHECK ECM (STA VOLTAGE)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Starter Signal Circuit

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connectors.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E8-12 (STA) - E11-3 (E1)
    		0 V

  1. Measure the voltage of the ECM connectors when the engine is cranked.

    Standard voltage:
    Tester Connection
    		Specified Condition
    E8-12 (STA) - E11-3 (E1)
    		6 V or more


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


2.CHECK HARNESS AND CONNECTOR (ECM - IGNITION SWITCH)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Tr-Fe Engine Control System.Sfi System.Sfi System Starter Signal Circuit

  1. Disconnect the E8 ECM connector.

  1. Disconnect the I8 ignition switch connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-12 (STA) - I8-7 (ST2)
    		Below 1 Ω
    E8-12 (STA) or I8-7 (ST2) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM