Ecd System (W/ Egr Cooler) Ecm Power Source Circuit

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

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 (w/ EGR Cooler) - 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


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) Ecm Power Source Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK07FX.html) and initialization (HILUX_TGN26 RM000000TIN04CX.html).
  2. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
1.INSPECT ECM (+B VOLTAGE)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) Ecm Power Source Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G39-1 (+B) - C23-7 (E1)
    		Ignition switch ON
    		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 (HILUX_TGN26 RM0000012WF073X.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
    C23-7 (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)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) 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
    G39-9 (IGSW) - C23-7 (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)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) 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
    G39-8 (MREL) - C23-7 (E1)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
REPLACE ECM (HILUX_TGN26 RM0000013Z001IX.html)
OK


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

  1. Inspect the No. 1 integration relay (MAIN relay) (HILUX_TGN26 RM00000469100QX_01_0004.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 - G39-1 (+B)
      		Always
      		Below 1 Ω
      1J-2 - G39-8 (MREL)
      		Always
      		Below 1 Ω
      1J-4 or G39-1 (+B) - Body ground
      		Always
      		10 kΩ or higher
      1J-2 or G39-8 (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


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf).Ecd System (W/ Egr Cooler) 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 (HILUX_TGN26 RM0000013XF01HX.html)
OK

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