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

WIRING DIAGRAM

Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction. SUSPENSION CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

NOTICE:

Before performing troubleshooting, inspect the connectors of related circuits.

If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed ().

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)

Connect the intelligent tester to the DLC3.

Start the engine and turn the tester on.

Select the Active Test mode on the intelligent tester.

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.

Go to step 3

OK

2.RECONFIRM DTC OUTPUT

Clear the DTCs ().

Perform a road test.

Check for DTCs.

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

USE SIMULATION METHOD TO CHECK ()

REPLACE SUSPENSION CONTROL ECU ()

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

Disconnect the N4 No. 1 height control valve connector.

Disconnect the K36 ECU connector.

Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction. SUSPENSION CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

Disconnect the N4 No. 1 height control valve connector.

Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction. SUSPENSION CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the K36 ECU connector.

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

Go to step 6

OK

5.INSPECT NO. 1 HEIGHT CONTROL VALVE

Connect the N4 No. 1 height control valve connector.

Disconnect the K36 ECU connector.

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

REPLACE NO. 1 HEIGHT CONTROL VALVE ()

REPLACE SUSPENSION CONTROL ECU ()

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

Disconnect the N10 and N12 front suspension control valve connectors.

Disconnect the N4 No. 1 height control valve connector.

Disconnect the K36 ECU connector.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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

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

HINT:

*1: for RH

*2: for LH

Disconnect the K36 ECU connector.

Dtc C1741 Front Height Control Solenoid Valve Rh Circuit Malfunction. SUSPENSION CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE FRONT SUSPENSION CONTROL VALVE

SUSPENSION CONTROL

Land Cruiser URJ200 URJ202 GRJ200 VDJ200

ACTIVE HEIGHT CONTROL SUSPENSION