DTC 33

CIRCUIT DESCRIPTION
The ECU energizes the height control valve solenoid, which opens the valve and leads compressed air to the pneumatic cylinder, thus raising the vehicle height.
When lowering the vehicle height, the ECU energizes not only the height control valve solenoid but also the exhaust valve solenoid which open the valve and discharge the compressed air in the pneumatic cylinder to the atmosphere.
Front and rear height control valves have two solenoid valves to control right hand and left hand pneumatic cylinders separately.
The exhaust valve is located on the compressor unit, and has one solenoid valve only.




DETECTING CONDITIONS




HINT: Code 33 corresponds to the rear RH height control valve circuit.
Once the ECU stores DTC 31, 32, 33, 34 or 35 in memory, vehicle height control is not carried out unit a normal signal is input to the ECU from the height control valves and exhaust valve.
However, control is resumed if the ignition switch is turned off, then on again.




WIRING DIAGRAM

Step 1:

Step 2:

Step 3:

INSPECTION PROCEDURE

HINT:
- Proceed with troubleshooting in accordance with the flow chart shown, regardless of whether or not DTC 31, 32, 33, 34, or 35 is displayed.
- When DTC 33 is displayed, check the rear RH height control valve circuit.
- If DTC 74 (power source circuit) is displayed, perform inspection necessary for DTC 74 first.