Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - SUSPENSION CONTROL
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT SPRING RATE SWITCHING VALVE)
CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - FRONT SUSPENSION CONTROL VALVE)
CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - FRONT SUSPENSION CONTROL VALVE)
INSPECT FRONT SUSPENSION CONTROL VALVE
CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - NO. 1 HEIGHT CONTROL VALVE)
CHECK HARNESS AND CONNECTOR (NO. 1 HEIGHT CONTROL VALVE - SUSPENSION CONTROL ECU)
DTC C1736 Front Suspension Control Valve RH Malfunction
DTC C1737 Front Suspension Control Valve LH Malfunction
DESCRIPTION
In order to decrease roll angle/pitch angle, the suspension control ECU turns the spring rate switching valve in the front suspension control valve off/on to change the fluid lines when the acceleration sensor or yaw rate sensor signal is input into the suspension control ECU. Normally, the spring rate switching valve is open.
| DTC Code | Detection Condition | Trouble area |
| C1736 | When either of the following is detected: With the spring rate switch valve RH not activated, an open signal of the spring rate switch valve RH is detected for 1 second or more. With the spring rate switch valve RH activated, a short signal of the spring rate switch valve RH is detected 8 times successively. | Harness or connector Front suspension control valve RH (Front spring rate switching valve RH) Suspension control ECU No. 1 height control valve |
| C1737 | When either of the following is detected: With the spring rate switch valve LH not activated, an open signal of the spring rate switch valve LH is detected for 1 second or more. With the spring rate switch valve LH activated, a short signal of the spring rate switch valve LH is detected 8 times successively. | Harness or connector Front suspension control valve LH (Front spring rate switching valve LH) Suspension control ECU No. 1 height control valve |
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- HINT:
- Power is supplied to the front suspension control valve and No. 1 height control valve from the suspension control ECU. If a short occurs in the power supply circuit in the No. 1 height control valve, DTC C1736 and/or C1737 will be stored. In this case, DTC C1741, C1742, C1743, C1744, C1753, C1754 and/or C1755 will also be stored.
| 1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT SPRING RATE SWITCHING 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 front spring rate switching valve solenoid when operating the solenoid with the intelligent tester.
| Tester Display | Test Part | Control Range | Diagnostic Note |
| FR Gas Spring Switch Valve | Front spring rate switching valve RH | ON or OFF | When the FR Gas Spring Switch Valve item of the Active Test is operated, the FR Gas Spring Switch Valve item of the Data List changes to ON/OFF. |
| FL Gas Spring Switch Valve | Front spring rate switching valve LH | ON or OFF | When the FL Gas Spring Switch Valve item of the Active Test is operated, the FL Gas Spring Switch Valve item of the Data List changes to ON/OFF. |
- OK:
- The front spring rate switching valve 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 (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 | |
| 4.CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - FRONT SUSPENSION CONTROL VALVE) |
Disconnect the K36 ECU connector.
Disconnect the N10*1 and/or N12*2 front suspension control valve connector.
- HINT:
- *1: for RH
- *2: for LH
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 FRONT SUSPENSION CONTROL VALVE |
Connect the N10 and/or N12 front suspension 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 K36-11 (CRFR) - K36-1 (SLB) at 20°C (68°F) 4.58 to 5.02 Ω K36-23 (CRFL) - K36-1 (SLB) at 20°C (68°F) 4.58 to 5.02 Ω
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| OK | ||
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| 6.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 | |
| 7.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 | ||
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