2. Check valve for open circuit.
Using an ohmmeter, verify that there is no open circuit in the valve winding by measuring its electrical resistance.
Valve winding resistance value (cold) is 4 ohms. Otherwise, replace the valve.
3. Using an ohmmeter, one wire of which is connected in turn to the terminals of the valve connector, and the other to the valve body, make sure that the valve winding is not shorted to the body ("mass").
If the ohmmeter registers any resistance other than infinity, then replace the valve.
4. Check valve operation:
- A) Make sure that air is not passing from port E to port F through the valve.
- 6) Apply battery voltage to the valve connector terminals and check that air is flowing from port E to port F.
Otherwise, replace the valve.
5. Replace the valve.