Ecd System Ecm Power Source Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ECM (+B VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT ECM (IGSW VOLTAGE)

INSPECT ECM (MREL VOLTAGE)

INSPECT NO. 1 INTEGRATION RELAY (MAIN RELAY)

CHECK HARNESS AND CONNECTOR (MAIN RELAY - ECM, MAIN RELAY - BODY GROUND)

INSPECT IGNITION SWITCH

ECD SYSTEM - ECM Power Source Circuit


DESCRIPTION

When the ignition switch is turned to ON, the battery voltage is applied to terminal IGSW of the ECM. The MREL output signal from ECM causes a current to flow to the coil, closing the contacts of the MAIN relay and supplying power to terminal +B of the ECM.

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Ecm Power Source Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the ECM, the new ECM needs registration (Toyota Fortuner RM0000012XK04AX.html) and initialization (Toyota Fortuner RM000000TIN04KX.html).
  2. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
1.INSPECT ECM (+B VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Ecm Power Source Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E4-1 (+B) - E6-7 (E1)
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Toyota Fortuner RM0000012WF040X.html)

2.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:

    Tester Connection
    		Condition
    		Specified Condition
    E6-7 (E1) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT ECM (IGSW VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Ecm Power Source Circuit

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E4-9 (IGSW) - E6-7 (E1)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 7
OK


4.INSPECT ECM (MREL VOLTAGE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Ecm Power Source Circuit

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E4-8 (MREL) - E6-7 (E1)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
REPLACE ECM (Toyota Fortuner RM0000043H100CX.html)
OK


5.INSPECT NO. 1 INTEGRATION RELAY (MAIN RELAY)

  1. Inspect the No. 1 integration relay (MAIN relay) (Toyota Fortuner RM0000014TJ02IX.html).



NG
REPLACE INTEGRATION NO. 1 RELAY (MAIN RELAY)
OK


6.CHECK HARNESS AND CONNECTOR (MAIN RELAY - ECM, MAIN RELAY - BODY GROUND)

  1. Check the harness and connector between the integration relay (MAIN relay) and ECM.

    1. Remove the integration relay (MAIN relay) from the No. 1 engine room R/B and J/B.

    2. Disconnect the ECM connector.

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      1J-4 - E4-1 (+B)
      		Always
      		Below 1 Ω
      1J-2 - E4-8 (MREL)
      		Always
      		Below 1 Ω
      1J-4 or E4-1 (+B) - Body ground
      		Always
      		10 kΩ or higher
      1J-2 or E4-8 (MREL) - Body ground
      		Always
      		10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reinstall the integration relay.

  1. Check the harness and connector between the integration relay (MAIN relay) and body ground.

    1. Remove the integration relay (MAIN relay) from the No. 1 engine room R/B and J/B.

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      1J-3 - Body ground
      		Always
      		Below 1 Ω

    3. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - MAIN RELAY)

7.INSPECT IGNITION SWITCH


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.2Kd-Ftv Engine Control System.Ecd System.Ecd System Ecm Power Source Circuit

  1. Disconnect the ignition switch connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    5 (AM2) - 6 (IG2)
    		LOCK
    		10 kΩ or higher
    5 (AM2) - 6 (IG2)
    		ON
    		Below 1 Ω
    Text in Illustration
    *1
    		Ignition Switch

  1. Reconnect the ignition switch connector.



NG
REPLACE IGNITION SWITCH (Toyota Fortuner RM0000013XF01EX.html)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH, IGNITION SWITCH - ECM)