Ecd System Starter Signal Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

When using intelligent tester:

READ VALUE USING INTELLIGENT TESTER (STA SIGNAL)

INSPECT FUSE (ST)

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - ST FUSE, ST FUSE - ECM)

When not using intelligent tester:

CHECK ECM (STA VOLTAGE)

INSPECT FUSE (ST)

CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - ST FUSE, ST FUSE - ECM)

ECD 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 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit


INSPECTION PROCEDURE


When using intelligent tester:

1.READ VALUE USING INTELLIGENT TESTER (STA SIGNAL)

  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 / Data List / Starter Signal.

  1. Read the STA signal on the intelligent tester while the starter operates.

    Result:
    Ignition Switch Position
    		STA Signal
    LOCK, ACC, ON
    		OFF
    START
    		ON


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


2.INSPECT FUSE (ST)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

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

  1. Measure the resistance of the fuse.

    Standard resistance:
    Tester Connection
    		Specified Condition
    ST fuse
    		Below 1 Ω


NG
CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE
OK


3.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - ST FUSE, ST FUSE - ECM)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

  1. Check the wire harness between the ignition switch and ST fuse.

    1. Disconnect the I8 ignition switch connector.

    2. Remove the ST fuse from the instrument panel junction block.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      I8-7 (ST2) - Instrument panel junction block ST fuse terminal 1
      		Below 1 Ω
      I8-7 (ST2) or instrument panel junction block ST fuse terminal 1 - Body ground
      		10 kΩ or higher


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

  1. Check the wire harness between the ST fuse and ECM.

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

    2. Disconnect the E23 ECM connector.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      Instrument panel junction block ST fuse terminal 2 - E23-11 (STA)
      		Below 1 Ω
      Instrument panel junction block ST fuse terminal 2 or E23-11 (STA) - 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 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

  1. Turn the ignition switch ON.

  1. Measure the voltage of the ECM connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E23-11 (STA) - E20-14 (E1)
    		Cranking
    		6 V or more


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


2.INSPECT FUSE (ST)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

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

  1. Measure the resistance of the ST fuse.

    Standard resistance:
    Tester Connection
    		Specified Condition
    ST fuse
    		Below 1 Ω


NG
CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE
OK


3.CHECK HARNESS AND CONNECTOR (IGNITION SWITCH - ST FUSE, ST FUSE - ECM)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

  1. Check the wire harness between the ignition switch and ST fuse.

    1. Disconnect the I8 ignition switch connector.

    2. Remove the ST fuse from the instrument panel junction block.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      I8-7 (ST2) - Instrument panel junction block ST fuse terminal 1
      		Below 1 Ω
      I8-7 (ST2) or instrument panel junction block ST fuse terminal 1 - Body ground
      		10 kΩ or higher


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.5L-E Engine Control System.Ecd System.Ecd System Starter Signal Circuit

  1. Check the wire harness between the ST fuse and ECM.

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

    2. Disconnect the E23 ECM connector.

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

      Standard resistance:
      Tester Connection
      		Specified Condition
      Instrument panel junction block ST fuse terminal 2 - E23-11 (STA)
      		Below 1 Ω
      Instrument panel junction block ST fuse terminal 2 or E23-11 (STA) - Body ground
      		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM