Dtc C1766 Height Control Pump Motor Current

Suspension. Land Cruiser. Urj200, 202 Grj200 Vdj200
Suspension Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

INSPECT FOR FLUID LEAK

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (LEVELING VALVE, ACCUMULATOR VALVE AND GATE VALVE)

INSPECT SUSPENSION CONTROL RELAY (AHC)

CHECK HEIGHT CONTROL PUMP AND MOTOR

INSPECT FLUID LINE

DTC 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.

DTC Code
Detection Condition
Trouble Area
C1766
When the height control pump and motor operates continuously for 135 seconds.
  1. Fluid leakage
  2. No. 1 height control valve
  3. Suspension control relay
  4. Height control pump and motor
  5. Clog in the fluid line
  6. Suspension control ECU

INSPECTION PROCEDURE

NOTICE:
  1. If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (Click here).
  2. When the cargo weight is extremely heavy, this DTC may be stored.
1.INSPECT FOR FLUID LEAK

  1. Inspect for fluid leaks (Click here).



NG
REPAIR FLUID LEAK OR REPLACE LEAKING PART(S)
OK


2.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (LEVELING VALVE, ACCUMULATOR VALVE AND GATE VALVE)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester on.

  1. Select the Active Test mode on the intelligent tester.

  1. Check the operation of the leveling valve solenoid, accumulator valve solenoid and gate valve solenoid when operating the solenoid with the intelligent tester.

    AHC
    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 valve solenoid and/or gate valve solenoid operates.


NG
REPLACE NO. 1 HEIGHT CONTROL VALVE (Click here)
OK


3.INSPECT SUSPENSION CONTROL RELAY (AHC)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1766 Height Control Pump Motor Current

  1. Remove the suspension control relay from the engine room relay block.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Battery voltage is not applied to terminal 1 and 2
    		10 kΩ or higher
    Battery voltage is applied to terminal 1 and 2
    		Below 1 Ω


NG
REPLACE SUSPENSION CONTROL RELAY
OK


4.CHECK HEIGHT CONTROL PUMP AND MOTOR

  1. Remove the height control pump and motor (Click here).



  1. Inspect if the compressor is stuck.



      Land Cruiser. Urj200, 202 Grj200 Vdj200.Suspension Control.Suspension Control System. Dtc C1766 Height Control Pump Motor Current

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

      OK:
      Measurement Condition
      		Specified Condition
      Battery positive (+) → Terminal 2
      Battery negative (-) → Terminal 1
      		Motor operates
      NOTICE:
      1. Do not allow the motor to operate for 60 seconds or more.
      2. 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 (Click here)
OK


5.INSPECT FLUID LINE

  1. Check if the fluid line is clogged.

    HINT:
    1. 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.
    2. 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 (Click here)