Ecd System (W/ Urea Scr System) Starter Signal Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WHETHER ENGINE CAN BE CRANKED

READ VALUE USING GTS (STARTER SIGNAL)

INSPECT STARTER RELAY (ST)

INSPECT STARTER ASSEMBLY

CHECK HARNESS AND CONNECTOR (STARTER RELAY - STARTER ASSEMBLY)

CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER ASSEMBLY)

CHECK HARNESS AND CONNECTOR (STARTER RELAY - BODY GROUND)

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - STATER RELAY (ST))

CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - STATER RELAY (ST))

CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER RELAY (ST))

INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (ECM - POWER MANAGEMENT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - STATER RELAY (ST))

CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - ECM)

INSPECT CLUTCH START SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (ECM - POWER MANAGEMENT CONTROL ECU - CLUTCH START SWITCH ASSEMBLY - STATER RELAY (ST))

CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - ECM)

READ VALUE USING GTS (STARTER SIGNAL)

ECD SYSTEM (w/ Urea SCR System) - Starter Signal Circuit


DESCRIPTION

While the engine is being cranked, the starter signal is also sent to terminal STA of the ECM.
The starter signal mainly performs engine control when the engine is started.

WIRING DIAGRAM

Refer to DTC P0617 (LandCruiser RM000000TA01L6X_05.html).

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 RM0000012XK0AUX.html) and initialization (LandCruiser RM000000TIN08HX.html).
HINT:
This chart is based on the premise that the engine can crank normally. If the engine cannot crank normally, proceed to Problem Symptoms Table (LandCruiser RM0000012WF0AEX.html).
1.CHECK WHETHER ENGINE CAN BE CRANKED

  1. Check if the engine can be cranked.


Result
Result
Proceed to
Engine cannot be cranked
A
Engine can be cranked
B


B
Go to step 17
A


2.READ VALUE USING GTS (STARTER SIGNAL)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Check the value displayed on the GTS when the engine switch is turned to the on (IG) and START positions.

    OK:

    Condition
    		GTS Display (Starter Signal)
    Engine switch on (IG)
    		OFF
    Engine started
    		ON

Result
Result
Proceed to
OK
A
NG (for automatic transmission models)
B
NG (for manual transmission models)
C


B
Go to step 11

C
Go to step 14
A


3.INSPECT STARTER RELAY (ST)

  1. Inspect the starter relay (ST) (LandCruiser RM000003BIA03FX_01_0002.html).



NG
REPLACE STARTER RELAY (ST)
OK


4.INSPECT STARTER ASSEMBLY

  1. Inspect the starter assembly.

    1. for 2.0 kW type (LandCruiser RM0000015XW02IX.html).
    2. for 2.7 kW type (LandCruiser RM0000015XW02JX.html).

Result
Result
Proceed to
OK
A
NG (for 2.0 kW type)
B
NG (for 2.7 kW type)
C


B
REPLACE STARTER ASSEMBLY (LandCruiser RM000000IY5012X.html)

C
REPLACE STARTER ASSEMBLY (LandCruiser RM000000IY5013X.html)
A


5.CHECK HARNESS AND CONNECTOR (STARTER RELAY - STARTER ASSEMBLY)

  1. Remove the starter relay (ST) from the engine room relay block.

  1. Disconnect the starter assembly connector.

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

    Standard Resistance (for 2.0 kW type):

    Tester Connection
    		Condition
    		Specified Condition
    Starter relay (ST) terminal 3 - D11-1
    		Always
    		Below 1 Ω
    Starter relay (ST) terminal 3 or D11-1 - Body ground and other terminals
    		Always
    		10 kΩ or higher

    Standard Resistance (for 2.7 kW type):

    Tester Connection
    		Condition
    		Specified Condition
    Starter relay (ST) terminal 3 - D10-1
    		Always
    		Below 1 Ω
    Starter relay (ST) terminal 3 or D10-1 - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reinstall the starter relay.

  1. Reconnect the starter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER ASSEMBLY)

  1. Disconnect the starter assembly connector.

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

    Standard Voltage (for 2.0 kW type):

    Tester Connection
    		Condition
    		Specified Condition
    D8-1 - Body ground
    		Always
    		11 to 14 V

    Standard Voltage (for 2.7 kW type):

    Tester Connection
    		Condition
    		Specified Condition
    D9-1 - Body ground
    		Always
    		11 to 14 V

  1. Reconnect the starter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (STARTER RELAY - BODY GROUND)

  1. Remove the starter relay (ST) 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
    Starter relay (ST) terminal 1 - Body ground
    		Always
    		Below 1 Ω

    Result
    Result
    		Proceed to
    OK (for automatic transmission models)
    		A
    OK (for manual transmission models)
    		B
    NG
    		C

  1. Reinstall the starter relay (ST).



B
Go to step 9

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A


8.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - STATER RELAY (ST))

  1. Remove the starter relay (ST) from the engine room relay block.

  1. Disconnect the park/neutral position switch assembly connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C159-5 (L) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    G50-2 (STA) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    C159-5 (L) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-2 (STA) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reinstall the starter relay (ST).

  1. Reconnect the park/neutral position switch assembly connector.

  1. Reconnect the power management control ECU connector.



OK
Go to step 10

NG
REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - STATER RELAY (ST))

  1. Remove the starter relay (ST) from the engine room relay block.

  1. Disconnect the clutch start switch assembly connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance (for LHD):

    Tester Connection
    		Condition
    		Specified Condition
    A40-1 - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    G50-2 (STA) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    A40-1 or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-2 (STA) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher

    Standard Resistance (for RHD):

    Tester Connection
    		Condition
    		Specified Condition
    r1-1 - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    G50-2 (STA) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    r1-1 or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-2 (STA) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reinstall the starter relay.

  1. Reconnect the the clutch start switch assembly connector.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.CHECK TERMINAL VOLTAGE (POWER SOURCE OF STARTER RELAY (ST))


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Gd-Ftv Engine Control.Ecd System.Ecd System (W/ Urea Scr System) Starter Signal Circuit

  1. Remove the starter relay (ST) 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
    Starter relay (ST) terminal 5 - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *1
    		Engine Room Relay Block
    *2
    		Starter Relay (ST)

  1. Reinstall the starter relay.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - STARTER RELAY)
OK

CHECK ENTRY AND START SYSTEM (LandCruiser RM000000YEF0MNX.html)

11.INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLY

  1. Inspect the park/neutral position switch assembly (LandCruiser RM000000OD401HX.html).



NG
REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY (LandCruiser RM000000O5O01MX.html)
OK


12.CHECK HARNESS AND CONNECTOR (ECM - POWER MANAGEMENT CONTROL ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY - STATER RELAY (ST))

  1. Remove the starter relay (ST) from the engine room relay block.

  1. Disconnect the park/neutral position switch assembly connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C159-5 (L) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    G50-2 (STA) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    C159-5 (L) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-2 (STA) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reinstall the starter relay.

  1. Reconnect the park/neutral position switch assembly connector.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


13.CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - ECM)

  1. Disconnect the ECM connector.

  1. Disconnect the park/neutral position switch assembly connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance:

    Tester Connection
    		Condition
    		Specified Condition
    C159-4 (B) - G50-3 (STAR)
    		Always
    		Below 1 Ω
    G50-3 (STAR) - G184-11 (NSW)
    		Always
    		Below 1 Ω
    C159-4 (B) or G50-3 (STAR) - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-3 (STAR) or G184-11 (NSW) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the park/neutral position switch assembly connector.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ENTRY AND START SYSTEM (LandCruiser RM000000YEF0MNX.html)

14.INSPECT CLUTCH START SWITCH ASSEMBLY

  1. Inspect the clutch start switch assembly (LandCruiser RM0000032S300DX.html).



NG
REPLACE CLUTCH START SWITCH ASSEMBLY
OK


15.CHECK HARNESS AND CONNECTOR (ECM - POWER MANAGEMENT CONTROL ECU - CLUTCH START SWITCH ASSEMBLY - STATER RELAY (ST))

  1. Remove the starter relay (ST) from the engine room relay block.

  1. Disconnect the clutch start switch assembly connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance (for LHD):

    Tester Connection
    		Condition
    		Specified Condition
    C40-1 - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    G50-2 (STA) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    C40-1 or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-2 (STA) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher

    Standard Resistance (for RHD):

    Tester Connection
    		Condition
    		Specified Condition
    r1-1 - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    G50-2 (STA) - Starter relay (ST) terminal 2
    		Always
    		Below 1 Ω
    r1-1 or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher
    G50-2 (STA) or Starter relay (ST) terminal 2 - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reinstall the starter relay.

  1. Reconnect the clutch start switch assembly connector.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


16.CHECK HARNESS AND CONNECTOR (CLUTCH START SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU - ECM)

  1. Disconnect the ECM connector.

  1. Disconnect the clutch start switch assembly connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance (for LHD):

    Tester Connection
    		Condition
    		Specified Condition
    A40-2 - G50-3 (STAR)
    		Always
    		Below 1 Ω
    A40-2 or G50-3 (STAR) - Body ground and other terminals
    		Always
    		10 kΩ or higher

    Standard Resistance (for RHD):

    Tester Connection
    		Condition
    		Specified Condition
    r1-2 - G50-3 (STAR)
    		Always
    		Below 1 Ω
    r1-2 or G50-3 (STAR) - Body ground and other terminals
    		Always
    		10 kΩ or higher

  1. Reconnect the ECM connector.

  1. Reconnect the clutch start switch assembly connector.

  1. Reconnect the power management control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

CHECK ENTRY AND START SYSTEM (LandCruiser RM000000YEF0MNX.html)

17.READ VALUE USING GTS (STARTER SIGNAL)

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG) and turn the GTS on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.

  1. Check the value displayed on the GTS when the engine switch is turned to the on (IG) and START positions.

    OK:

    Condition
    		GTS Display (Starter Signal)
    Engine switch on (IG)
    		OFF
    Engine started
    		ON


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY - ECM)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000012WF0AEX.html)