Ecd System Ecm Power Source Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT NO. 1 INTEGRATION RELAY (NO. 1 INTEGRATION RELAY - BODY GROUND)

INSPECT NO. 1 INTEGRATION RELAY (EFI , IG2)

INSPECT ECM (IGSW VOLTAGE)

CHECK WIRE HARNESS (NO. 1 INTEGRATION RELAY - ECM)

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

CHECK WIRE HARNESS (IGNITION SWITCH ASSEMBLY - NO. 1 INTEGRATION RELAY)

INSPECT IGNITION SWITCH ASSEMBLY

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 ECM "MREL" output signal causes a current to flow to the coil, closing the contacts of the EFI relay and supplying power to terminal +B of the ECM.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System.Ecd System Ecm Power Source Circuit


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  2. After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
1.INSPECT NO. 1 INTEGRATION RELAY (NO. 1 INTEGRATION RELAY - BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System.Ecd 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
    *1
    		Engine Room Relay Block
    *a
    		Front view of wire harness connector
    (to No. 1 integration Relay)

  1. Reinstall the integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Inspect the No. 1 integration relay (EFI) (LandCruiser RM000004691018X_01_0004.html).

  1. Inspect the No. 1 integration relay (IG2) (LandCruiser RM000004691018X_01_0006.html).



NG
REPLACE NO. 1 INTEGRATION RELAY
OK


3.INSPECT ECM (IGSW VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.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
    G58-24 (IGSW) - C93-1 (E1)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (to ECM)

Result
Result
Proceed to
OK
A
NG (w/ Entry and Start System)
B
NG (w/o Entry and Start System)
C


B
Go to step 5

C
Go to step 6
A


4.CHECK WIRE HARNESS (NO. 1 INTEGRATION RELAY - ECM)

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

  1. Disconnect the ECM connector.

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

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G58-11 (MREL) - 1B-2
    		Always
    		Below 1 Ω
    G57-24 (+B) - 1B-4
    		Always
    		Below 1 Ω
    G57-17 (+B2) - 1B-4
    		Always
    		Below 1 Ω
    G58-24 (IGSW) - 1A-5
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G58-11 (MREL) or 1B-2 - Body ground
    		Always
    		10 kΩ or higher
    G57-24 (+B) or 1B-4 - Body ground
    		Always
    		10 kΩ or higher
    G57-17 (+B2) or 1B-4 - Body ground
    		Always
    		10 kΩ or higher
    G58-24 (IGSW) or 1A-5 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (LandCruiser RM0000013Z002CX.html)

5.CHECK WIRE HARNESS (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)

  1. Remove the power management control ECU.

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

  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 power management control ECU.

  1. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ENTRY AND START SYSTEM (LandCruiser RM000000YEF0MNX.html)

6.CHECK WIRE HARNESS (IGNITION SWITCH ASSEMBLY - NO. 1 INTEGRATION RELAY)

  1. Disconnect the ignition switch assembly connector.

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

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

    Standard Resistance (Check for Open):
    Tester Connection
    		Condition
    		Specified Condition
    G2-6 (IG2) - 1A-1
    		Always
    		Below 1 Ω
    Standard Resistance (Check for Short):
    Tester Connection
    		Condition
    		Specified Condition
    G2-6 (IG2) or 1A-1 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ignition switch assembly connector.

  1. Reinstall the No. 1 integration relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.INSPECT IGNITION SWITCH ASSEMBLY

  1. Inspect the ignition switch assembly (LandCruiser RM00000474M00FX.html).



NG
REPAIR OR REPLACE IGNITION OR STARTER SWITCH ASSEMBLY
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH ASSEMBLY - BATTERY)