1. Remove the valve .
2. Check the valve.
- a) Using an ohmmeter, make sure that there is no break in the valve winding circuit by measuring its electrical resistance.
The value of the valve winding resistance (in a cold state) is: 30-33 Ohm.
Otherwise, replace the valve.
- b) Using an ohmmeter, one wire of which is alternately connected to the terminals of the valve connector, and the other to the valve body, make sure that there is no short circuit between the valve winding and the body ("ground").
If the ohmmeter registers any resistance other than infinity, replace the valve.
- c) Check the operation of the valve.
- d) Make sure air flows through port "E" to port "F":
(The text is quoted from the source website: toyotaman.ru)
- d) Apply battery voltage to the valve connector terminals and make sure that air flows through port "E" to port "F".
Otherwise, replace the valve.