Ecd System Pre-Heating Control Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK GLOW INDICATOR LIGHT

CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

CHECK INDICATOR LIGHTING TIME AND AFTER GLOW TIME

READ OUTPUT DTC

INSPECT GLOW RELAY ASSEMBLY

CHECK ECM (SREL VOLTAGE)

CHECK HARNESS AND CONNECTOR (GLOW RELAY - ECM AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY (GLOW) - GLOW PLUG ASSEMBLY AND BATTERY)

CHECK ECM (GIND VOLTAGE)

CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER ASSEMBLY)

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)

ECD SYSTEM - Pre-heating Control Circuit


DESCRIPTION

When the ignition switch is turned to ON, the ECM calculates the glow indicator lighting time/heating corresponding to the coolant temperature at that time and turns on the glow indicator light/glow plug relay (GLOW).
As ceramic is used for glow plug assembly material, current control is not performed.

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Pre-Heating Control Circuit


WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Pre-Heating Control Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK GLOW INDICATOR LIGHT

  1. Turn the ignition switch to ON.

  1. Check that the glow indicator light comes on.

    OK:
    The glow indicator light remains on for 0.5 seconds or more, and then goes off.


NG
Go to step 10
OK


2.CHECK GLOW PLUG ASSEMBLY (INSTALLATION)

  1. Check that the glow plug assembly and glow plug wire are securely installed.

    OK:
    The glow plug assembly and glow plug wire are securely installed.


NG
TIGHTEN GLOW PLUG ASSEMBLY
OK


3.INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)

  1. Inspect the glow plug assembly (LandCruiser RM000001K4600FX_01_0001.html).



NG
REPLACE GLOW PLUG ASSEMBLY (LandCruiser RM0000016HL00MX.html)
OK


4.CHECK INDICATOR LIGHTING TIME AND AFTER GLOW TIME


NG
REPLACE ECM (LandCruiser RM000000VW203FX.html)
OK


5.READ OUTPUT DTC

  1. Connect the GTS to the DLC3.

  1. Turn the ignition switch to ON and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs (LandCruiser RM000000VR600WX.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B


B
GO TO RELEVANT DTC CHART (LandCruiser RM000000VQT00VX.html)
A


6.INSPECT GLOW RELAY ASSEMBLY

  1. Inspect the glow plug relay (GLOW) (LandCruiser RM000003BIA03CX.html).



NG
REPLACE GLOW PLUG RELAY (GLOW)
OK


7.CHECK ECM (SREL VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Pre-Heating Control Circuit

  1. Turn the ignition switch to the start position.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G183-8 (SREL) - C161-5 (E1)
    		Cranking
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (ECM)


NG
REPLACE ECM (LandCruiser RM000000VW203FX.html)
OK


8.CHECK HARNESS AND CONNECTOR (GLOW RELAY - ECM AND BODY GROUND)

  1. Disconnect the ECM connector.

  1. Remove the glow relay from the engine room relay block.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    G183-8 (SREL) - Relay block glow relay terminal 2
    		Always
    		Below 1 Ω
    Relay block glow relay terminal 1 - Body ground
    		Always
    		Below 1 Ω
    G183-8 (SREL) or relay block glow relay terminal 2 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reinstall the glow relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY (GLOW) - GLOW PLUG ASSEMBLY AND BATTERY)

  1. Disconnect the cable from the negative (-) battery terminal.

  1. Disconnect the cable from the positive (+) battery terminal.

  1. Remove the glow relay from the engine room relay block.

  1. Disconnect the glow plug wire.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Relay block glow relay terminal 3 - C114-1
    		Always
    		Below 1 Ω
    Relay block glow relay terminal 5 - Positive (+) battery terminal
    		Always
    		Below 1 Ω
    NOTICE:
    After reconnecting the battery cable, the radio and clock need to be adjusted as they were previously.

  1. Reinstall the glow relay.

  1. Reconnect the glow plug wire.

  1. Reconnect the cable to the positive (+) battery terminal.

  1. Reconnect the cable to the negative (-) battery terminal.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM000000VQC00UX.html)

10.CHECK ECM (GIND VOLTAGE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Pre-Heating Control Circuit

  1. Disconnect the ECM connector.

  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
    G182-12 (GIND) - C161-5 (E1)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to ECM)

  1. Reconnect the ECM connector.



NG
Go to step 11
OK

REPLACE ECM (LandCruiser RM000000VW203FX.html)

11.CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER ASSEMBLY)

  1. Disconnect the combination meter assembly connector.

  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
    G7-8 - G182-12 (GIND)
    		Always
    		Below 1 Ω

  1. Reconnect the combination meter assembly connector.

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


12.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.5L-E Engine Control.Ecd System.Ecd System Pre-Heating Control Circuit

  1. Disconnect the combination meter assembly connector.

  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
    G6-28 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Combination Meter Assembly)

  1. Reconnect the combination meter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY (LandCruiser RM000003QKY01CX.html)