C1741

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1741-C1744,C1753-C1755: Front Height Control Solenoid Valve RH Circuit 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.





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 Programming and Relearning.

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.

PROCEDURE

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

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine and turn the Techstream on.

(d) Enter the following menus: Chassis / AHC / Active Test.

(e) Check the operation of the leveling valve solenoid, accumulator valve solenoid and gate valve solenoid when operating the solenoid with the Techstream.

AHC





OK:

The leveling valve solenoid, accumulator solenoid and/or gate valve solenoid operates.

NG -- CHECK HARNESS AND CONNECTOR (NO. 1 HEIGHT CONTROL VALVE - SUSPENSION CONTROL ECU)
OK -- Continue to next step.

2. RECONFIRM DTC OUTPUT

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Perform a road test.

(c) Check for DTCs.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE SUSPENSION CONTROL ECU Removal

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

(a) Disconnect the N3 No. 1 height control valve connector.

(b) Disconnect the K32 ECU connector.





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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

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

(a) Disconnect the N3 No. 1 height control valve connector.

(b) Disconnect the K32 ECU connector.





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

Standard Resistance:





NG -- CHECK HARNESS AND CONNECTOR (BODY GROUND BETWEEN ECU - FRONT SUSPENSION CONTROL VALVE)
OK -- Continue to next step.

5. INSPECT NO. 1 HEIGHT CONTROL VALVE

(a) Connect the N3 No. 1 height control valve connector.

(b) Disconnect the K32 ECU connector.

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





Standard Resistance:





NG -- REPLACE NO. 1 HEIGHT CONTROL VALVE Removal

OK -- REPLACE SUSPENSION CONTROL ECU Removal

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

(a) Disconnect the N9 and N11 front suspension control valve connectors.

(b) Disconnect the N3 No. 1 height control valve connector.

(c) Disconnect the K32 ECU connector.

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





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - FRONT SUSPENSION CONTROL VALVE) C1736

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE FRONT SUSPENSION CONTROL VALVE