Sfi System Ecm Power Source Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)

INSPECT NO. 1 INTEGRATION RELAY (EFI AND IG2)

CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT)

CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

INSPECT ECM (IGSW VOLTAGE)

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM, NO. 1 INTEGRATION RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)

CHECK ENTRY AND START SYSTEM (POWER SOURCE MODE DOES NOT CHANGE)

SFI SYSTEM - ECM Power Source Circuit


DESCRIPTION

When the engine switch is turned to on (IG), battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the No. 1 integration relay (EFI) and supplying power to either terminal +B or +B2 of the ECM.

WIRING DIAGRAM

  1. for Automatic Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

  1. for Manual Transmission

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

  1. Remove the No. 1 integration relay from the engine room relay block.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    1C-1 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *a
    		Front view of wire harness connector
    (to No. 1 Integration Relay)

  1. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.INSPECT NO. 1 INTEGRATION RELAY (EFI AND IG2)

  1. Inspect the EFI relay (LandCruiser RM000003BLB03QX_01_0014.html).

  1. Inspect the IG2 relay (LandCruiser RM000003BLB03QX_01_0002.html).



NG
REPLACE NO. 1 INTEGRATION RELAY
OK


3.CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT)

  1. Check the harness and connectors between the No. 1 integration relay and ECM.

    1. Remove the No. 1 integration relay from the engine room relay block.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open):
      for Automatic Transmission
      Tester Connection
      		Condition
      		Specified Condition
      G56-36 (MREL) - 1B-2
      		Always
      		Below 1 Ω
      G55-23 (+B) - 1B-4
      		Always
      		Below 1 Ω
      G55-22 (+B2) - 1B-4
      		Always
      		Below 1 Ω
      for Manual Transmission
      Tester Connection
      		Condition
      		Specified Condition
      G55-9 (MREL) - 1B-2
      		Always
      		Below 1 Ω
      G55-22 (+B) - 1B-4
      		Always
      		Below 1 Ω
      G55-23 (+B2) - 1B-4
      		Always
      		Below 1 Ω

      Standard Resistance (Check for Short):
      for Automatic Transmission
      Tester Connection
      		Condition
      		Specified Condition
      G56-36 (MREL) or 1B-2 - Body ground
      		Always
      		10 kΩ or higher
      G55-23 (+B) or 1B-4 - Body ground
      		Always
      		10 kΩ or higher
      G55-22 (+B2) or 1B-4 - Body ground
      		Always
      		10 kΩ or higher
      for Manual Transmission
      Tester Connection
      		Condition
      		Specified Condition
      G55-9 (MREL) or 1B-2 - Body ground
      		Always
      		10 kΩ or higher
      G55-22 (+B) or 1B-4 - Body ground
      		Always
      		10 kΩ or higher
      G55-23 (+B2) or 1B-4 - Body ground
      		Always
      		10 kΩ or higher

    4. Reinstall the No. 1 integration relay.

    5. Reconnect the ECM connector.

  1. Check the harness and connectors between the No. 1 integration relay and body ground.

    1. Remove the No. 1 integration relay from the engine room relay block.

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

      Standard Resistance (Check for Open):
      Tester Connection
      		Condition
      		Specified Condition
      1B-3 - Body ground
      		Always
      		Below 1 Ω

    3. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.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 (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    C36-12 (E1) - Body ground
    		Always
    		Below 1 Ω

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.INSPECT ECM (IGSW VOLTAGE)
Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gr-Fe Engine Control.Sfi System.Sfi System Ecm Power Source Circuit

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

    Standard Voltage:
    for Automatic Transmission
    Tester Connection
    		Switch Condition
    		Specified Condition
    G55-21 (IGSW) - C36-12 (E1)
    		Engine switch on (IG)
    		11 to 14 V
    for Manual Transmission
    Tester Connection
    		Switch Condition
    		Specified Condition
    G56-21 (IGSW) - C36-12 (E1)
    		Engine switch on (IG)
    		11 to 14 V
    Text in Illustration
    *A
    		for Automatic Transmission
    *B
    		for Manual Transmission
    *a
    		Component with harness connected
    (ECM)


NG
Go to step 6
OK

REPLACE ECM (LandCruiser RM00000329203TX.html)

6.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM, NO. 1 INTEGRATION RELAY - BODY GROUND)

  1. Remove the No. 1 integration relay from the engine room relay block.

  1. Disconnect the ECM connector.

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

    Standard Resistance (Check for Open):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    1A-5 - G55-21 (IGSW)
    		Always
    		Below 1 Ω
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    1A-5 - G56-21 (IGSW)
    		Always
    		Below 1 Ω

    Standard Resistance (Check for Short):
    for Automatic Transmission
    Tester Connection
    		Condition
    		Specified Condition
    1A-5 or G55-21 (IGSW) - Body ground
    		Always
    		10 kΩ or higher
    for Manual Transmission
    Tester Connection
    		Condition
    		Specified Condition
    1A-5 or G56-21 (IGSW) - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the No. 1 integration relay.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)

  1. Remove the No. 1 integration relay from the engine room relay block.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G50-8 (IG2D) - 1A-1
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G50-8 (IG2D) or 1A-1 - Body ground
    		Always
    		10 kΩ or higher

  1. Reinstall the No. 1 integration relay.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK ENTRY AND START SYSTEM (POWER SOURCE MODE DOES NOT CHANGE)

  1. Check the entry and start system (LandCruiser RM000003U3G028X.html).



NG
REPAIR ENTRY AND START SYSTEM (LandCruiser RM000003U3G028X.html)
OK

REPLACE ECM (LandCruiser RM00000329203TX.html)