C1766

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1766: Height Control Pump Motor Current
C1766 - Height Control Pump Motor Current

DESCRIPTION

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.





INSPECTION PROCEDURE

NOTICE:
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.
- When the cargo weight is extremely heavy, this DTC may be stored.

PROCEDURE

1. INSPECT FOR FLUID LEAK

(a) Inspect for fluid leaks Testing and Inspection.

NG -- REPAIR FLUID LEAK OR REPLACE LEAKING PART(S)
OK -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (LEVELING VALVE, ACCUMULATOR VALVE AND GATE 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 valve solenoid and/or gate valve solenoid operates.

NG -- REPLACE NO. 1 HEIGHT CONTROL VALVE Removal
OK -- Continue to next step.

3. INSPECT SUSPENSION CONTROL RELAY (AHC)

(a) Remove the suspension control relay from the engine room relay block.





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

Standard Resistance:





NG -- REPLACE SUSPENSION CONTROL RELAY
OK -- Continue to next step.

4. CHECK OPERATION OF HEIGHT CONTROL PUMP AND MOTOR

(a) Remove the height control pump and motor Removal.

(b) Inspect if the compressor is stuck.

(1) Apply battery voltage to the compressor motor and check the operation of the motor.





OK:





NOTICE:
- 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.

NG -- REPLACE HEIGHT CONTROL PUMP AND MOTOR Removal
OK -- Continue to next step.

5. INSPECT FLUID LINE

(a) Check if the fluid line is clogged.

HINT
- 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.

NG -- REPAIR OR REPLACE CLOGGED PARTS

OK -- REPLACE SUSPENSION CONTROL ECU Removal