Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction

Suspension. Land Cruiser. Urj200, 202 Grj200 Vdj200
Suspension Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (NO. 1 HEIGHT CONTROL VALVE)

RECONFIRM DTC OUTPUT

CHECK HARNESS AND CONNECTOR (NO. 1 HEIGHT CONTROL VALVE - SUSPENSION CONTROL ECU)

CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - NO. 1 HEIGHT CONTROL VALVE)

INSPECT NO. 1 HEIGHT CONTROL VALVE

CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - FRONT SUSPENSION CONTROL VALVE)

CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - FRONT SUSPENSION CONTROL VALVE)

DTC C1741 Front Height Control Solenoid Valve RH Circuit Malfunction

DTC C1742 Front Height Control Solenoid Valve LH Circuit Malfunction

DTC C1743 Rear Height Control Solenoid Valve RH Circuit Malfunction

DTC C1744 Rear Height Control Solenoid Valve LH Circuit Malfunction

DTC C1753 Accumulator Solenoid Valve Malfunction

DTC C1754 Front Gate Solenoid Valve Malfunction

DTC C1755 Rear Gate Solenoid Valve Malfunction


DESCRIPTION

The control valve solenoid assembly consists of each front and rear leveling valve, gate valve and accumulator valve. It performs the height control and connects and disconnects the fluid line of the right and left shock absorber by operating the solenoid valve with the control signal from the ECU.

DTC Code
Detection Condition
Trouble Area
C1741
When either of the following is detected:
  1. With the front leveling valve RH not activated, an open signal of the front leveling valve RH is detected for 1 second or more.
  2. With the front leveling valve RH activated, a short signal of the front leveling valve RH is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)
C1742
When either of the following is detected:
  1. With the front leveling valve LH not activated, an open signal of the front leveling valve LH is detected for 1 second or more.
  2. With the front leveling valve LH activated, a short signal of the front leveling valve LH is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)
C1743
When either of the following is detected:
  1. With the rear leveling valve RH not activated, an open signal of the rear leveling valve RH is detected for 1 second or more.
  2. With the rear leveling valve RH activated, a short signal of the rear leveling valve RH is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)
C1744
When either of the following is detected:
  1. With the rear leveling valve LH not activated, an open signal of the rear leveling valve LH is detected for 1 second or more.
  2. With the rear leveling valve LH activated, a short signal of the rear leveling valve LH is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)
C1753
When either of the following is detected:
  1. With the accumulator valve not activated, an open signal of the accumulator valve is detected for 1 second or more.
  2. With the accumulator valve activated, a short signal of the accumulator valve is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)
C1754
When either of the following is detected:
  1. With the front gate valve not activated, an open signal of the front gate valve is detected for 1 second or more.
  2. With the front gate valve activated, a short signal of the front gate valve is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)
C1755
When either of the following is detected:
  1. With the rear gate valve not activated, an open signal of the rear gate valve is detected for 1 second or more.
  2. With the rear gate valve activated, a short signal of the rear gate valve is detected 8 times successively.
  1. Harness or connector
  2. No. 1 height control valve
  3. Suspension control ECU
  4. Each front suspension control valve (Each front spring rate switching valve)

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Before performing troubleshooting, inspect the connectors of related circuits.
  2. If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (Click here).
HINT:
Power is supplied to the No. 1 height control valve and front suspension control valve from the suspension control ECU. If a short occurs in the power supply circuit in the front suspension control valve, DTC C1741, C1742, C1743, C1744, C1753, C1754 and/or C1755 will be stored. In this case, DTC C1736 and/or C1737 will also be stored.
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (NO. 1 HEIGHT CONTROL VALVE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester on.

  1. Select the Active Test mode on the intelligent tester.

  1. Check the operation of the leveling valve solenoid, accumulator valve solenoid and gate valve solenoid when operating the solenoid with the intelligent tester.

    AHC
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Front Right Height Solenoid
    		Front height control solenoid valve RH
    		ON or OFF
    		Operation of solenoid can be heard.
    Front Left Height Solenoid
    		Front height control solenoid valve LH
    		ON or OFF
    		Operation of solenoid can be heard.
    Rear Right Height Solenoid
    		Rear height control solenoid valve RH
    		ON or OFF
    		Operation of solenoid can be heard.
    Rear Left Height Solenoid
    		Rear height control solenoid valve LH
    		ON or OFF
    		Operation of solenoid can be heard.
    Accumulator Valve
    		Accumulator solenoid valve
    		ON or OFF
    		Operation of solenoid can be heard.
    Front Gate Valve
    		Front gate solenoid valve
    		ON or OFF
    		When the Front Gate Valve item of the Active Test is operated, the Front Gate Valve item of the Data List changes to ON/OFF.
    Rear Gate Valve
    		Rear gate solenoid valve
    		ON or OFF
    		When the Rear Gate Valve item of the Active Test is operated, the Rear Gate Valve item of the Data List changes to ON/OFF.
    OK:
    The leveling valve solenoid, accumulator solenoid and/or gate valve solenoid operates.


NG
Go to step 3
OK


2.RECONFIRM DTC OUTPUT

  1. Clear the DTCs (Click here).

  1. Perform a road test.

  1. Check for DTCs.

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


B
USE SIMULATION METHOD TO CHECK (Click here)
A

REPLACE SUSPENSION CONTROL ECU (Click here)

3.CHECK HARNESS AND CONNECTOR (NO. 1 HEIGHT CONTROL VALVE - SUSPENSION CONTROL ECU)

  1. Disconnect the N4 No. 1 height control valve connector.



  1. Disconnect the K36 ECU connector.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K36-1 (SLB) - N4-6 (SLB)
    		Always
    		Below 1 Ω
    K36-7 (SLFR) - N4-4 (SLFR)
    		Always
    		Below 1 Ω
    K36-7 (SLFR) - Body ground
    		Always
    		10 kΩ or higher
    K36-8 (SLFL) - N4-3 (SLFL)
    		Always
    		Below 1 Ω
    K36-8 (SLFL) - Body ground
    		Always
    		10 kΩ or higher
    K36-9 (SLRR) - N4-1 (SLRR)
    		Always
    		Below 1 Ω
    K36-9 (SLRR) - Body ground
    		Always
    		10 kΩ or higher
    K36-10 (SLAC) - N4-7 (AHC-)
    		Always
    		Below 1 Ω
    K36-10 (SLAC) - Body ground
    		Always
    		10 kΩ or higher
    K36-22 (SLRL) - N4-2 (SLRL)
    		Always
    		Below 1 Ω
    K36-22 (SLRL) - Body ground
    		Always
    		10 kΩ or higher
    K36-29 (SLRG) - N4-5 (SLRG)
    		Always
    		Below 1 Ω
    K36-29 (SLRG) - Body ground
    		Always
    		10 kΩ or higher
    K36-30 (SLFG) - N4-8 (SLFG)
    		Always
    		Below 1 Ω
    K36-30 (SLFG) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - NO. 1 HEIGHT CONTROL VALVE)

  1. Disconnect the N4 No. 1 height control valve connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction

  1. Disconnect the K36 ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K36-1 (SLB) - Body ground
    		Always
    		10 kΩ or higher


NG
Go to step 6
OK


5.INSPECT NO. 1 HEIGHT CONTROL VALVE

  1. Connect the N4 No. 1 height control valve connector.

  1. Disconnect the K36 ECU connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K36-7 (SLFR) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-7 (SLFR) - Body ground
    		Always
    		10 kΩ or higher
    K36-8 (SLFL) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-8 (SLFL) - Body ground
    		Always
    		10 kΩ or higher
    K36-9 (SLRR) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-9 (SLRR) - Body ground
    		Always
    		10 kΩ or higher
    K36-10 (SLAC) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-10 (SLAC) - Body ground
    		Always
    		10 kΩ or higher
    K36-22 (SLRL) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-22 (SLRL) - Body ground
    		Always
    		10 kΩ or higher
    K36-29 (SLRG) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-29 (SLRG) - Body ground
    		Always
    		10 kΩ or higher
    K36-30 (SLFG) - K36-1 (SLB)
    		Always
    		3 to 3.8 Ω
    K36-30 (SLFG) - Body ground
    		Always
    		10 kΩ or higher
    K36-1 (SLB) - Body ground
    		Always
    		10 kΩ or higher


NG
REPLACE NO. 1 HEIGHT CONTROL VALVE (Click here)
OK

REPLACE SUSPENSION CONTROL ECU (Click here)

6.CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - FRONT SUSPENSION CONTROL VALVE)

  1. Disconnect the N10 and N12 front suspension control valve connectors.

  1. Disconnect the N4 No. 1 height control valve connector.

  1. Disconnect the K36 ECU connector.



    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K36-1 (SLB) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - FRONT SUSPENSION CONTROL VALVE)

  1. Disconnect the N10*1 and/or N12*2 front suspension control valve connector.

    HINT:
    *1: for RH
    *2: for LH


  1. Disconnect the K36 ECU connector.


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    K36-11 (CRFR) - N10-1 (CRFR)
    		Always
    		Below 1 Ω
    K36-11 (CRFR) - Body ground
    		Always
    		10 kΩ or higher
    K36-23 (CRFL) - N12-1 (CRFL)
    		Always
    		Below 1 Ω
    K36-23 (CRFL) - Body ground
    		Always
    		10 kΩ or higher
    K36-1 (SLB) - N10-2 (SLB)
    		Always
    		Below 1 Ω
    K36-1 (SLB) - N12-2 (SLB)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE FRONT SUSPENSION CONTROL VALVE