|DTC Code||DTC Name|
|C1766||Height Control Pump Motor Current|
In case that the height control has not finished in spite of performing the raise control for a certain period of time, the ECU interrupts the height control.
|DTC Code||Detection Condition||Trouble Area|
|C1766||When the height control pump and motor operates continuously for 135 seconds.||
CAUTION / NOTICE / HINT
If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Click here.
When the cargo weight is extremely heavy, this DTC may be stored.
INSPECT FOR FLUID LEAK
Inspect for fluid leaks Click here.
REPAIR FLUID LEAK OR REPLACE LEAKING PART(S)
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (LEVELING VALVE, ACCUMULATOR VALVE AND GATE VALVE)
Turn the engine switch off.
Connect the intelligent tester to the DLC3.
Start the engine and turn the intelligent tester on.
Enter the following menus: Chassis / AHC / Active Test.
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 the solenoid can be heard.|
|Front Left Height Solenoid||Front height control solenoid valve LH||ON or OFF||Operation of the solenoid can be heard.|
|Rear Right Height Solenoid||Rear height control solenoid valve RH||ON or OFF||Operation of the solenoid can be heard.|
|Rear Left Height Solenoid||Rear height control solenoid valve LH||ON or OFF||Operation of the solenoid can be heard.|
|Accumulator Valve||Accumulator solenoid valve||ON or OFF||Operation of the 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.|
|The leveling valve solenoid, accumulator valve solenoid and/or gate valve solenoid operates.|
REPLACE NO. 1 HEIGHT CONTROL VALVE Click here
INSPECT SUSPENSION CONTROL RELAY (AHC)
Remove the suspension control relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
REPLACE SUSPENSION CONTROL RELAY
CHECK OPERATION OF HEIGHT CONTROL PUMP AND MOTOR
Remove the height control pump and motor Click here.
Inspect if the compressor is stuck.
|*1||Component without harness connected: (Height Control Pump and Motor)|
Apply battery voltage to the compressor motor and check the operation of the motor.
Do not allow the motor to operate for 60 seconds or more.
If the height control pump and motor is shorted, locked, or has a similar type of malfunction, a large amount of current will be flowing. Therefore, if the motor does not operate, immediately stop this inspection.
REPLACE HEIGHT CONTROL PUMP AND MOTOR Click here
INSPECT FLUID LINE
Check if the fluid line is clogged.
Check if the fluid line that connects the height control pump and motor and No. 1 height control valve is clogged. If it is not clogged, there probably is foreign matter clogging the interior of the No. 1 height control valve.
Follow the removal and installation procedures for each part, as all parts need to be removed.
REPLACE SUSPENSION CONTROL ECU Click here
REPAIR OR REPLACE CLOGGED PARTS