C1765

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1764,C1765: Abnormal Leveling Valve Oil Pressure


DESCRIPTION

The solenoid valve is located in the No. 1 height control valve. When the vehicle height is adjusted, the fluid line is opened or closed according to the signal from the suspension control ECU. If the height control pump and motor activates when the fluid line is closed due to the solenoid valve malfunctioning, the solenoid valve being stuck, or foreign matter clogging the fluid line, fluid pressure increases abnormally. When this problem with the fluid pressure is detected, DTC C1764 and/or DTC C1765 is stored.





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.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (EACH LEVELING VALVE AND ACCUMULATOR 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 sound of the solenoid or vibration of the leveling valve solenoid and accumulator valve solenoid when operating the solenoid with the Techstream.

AHC





OK:

The operation sound of the solenoid should be heard or the vibration of the leveling valve solenoid or accumulator valve solenoid should be felt.

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

2. CHECK 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