Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - SUSPENSION CONTROL
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (NO. 1 HEIGHT CONTROL VALVE)
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: 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
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.
| 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.
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| OK | |
| 2.RECONFIRM DTC OUTPUT |
Clear the DTCs ().
Perform a road test.
Check for DTCs.
| Result | Proceed to |
| DTC is output | A |
| DTC is not output | B |
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| A | ||
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| 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.
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
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| OK | |
| 4.CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - NO. 1 HEIGHT CONTROL VALVE) |
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
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| 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
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| OK | ||
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| 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
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| 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.
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
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| OK | ||
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