C1744

DTC C1744 TANK SOLENOID VALVE CIRCUIT

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The tank solenoid which is installed in the pneumatic tank assembly operates the solenoid valve according to the signal from suspension control ECU. When lowering the vehicle height, high pressure air in the system is discharged to the pneumatic tank assembly. When the vehicle height control is suspended, the high pressure air in the pneumatic tank assembly is discharged. The tank solenoid continues its operation for max. 60 seconds after the ignition switch is turned off. This takes place in order to discharge the high pressure air which is produced when the vehicle height is lowered by the auto leveling function and access mode or exhausting high pressure air in the pneumatic tank assembly.

HINT: Since high pressure air which is discharged from the exhaust solenoid is reused for removing moisture in the dryer, discharge speed of the high pressure air is limited. In order to increase the speed of lowering the vehicle height, some amount of high pressure air is discharged to the pneumatic tank assembly. Then, the stored air in the pneumatic tank assembly is discharged from the exhaust solenoid while the vehicle height control is not in operation.

Wiring Diagram:

Step 1 - 2:

Step 3:

Step 4 - 5:

INSPECTION PROCEDURE