505 L4-2155cc N9te (1986)
Fig. 1 Evaporative emission control (EEC) system
Diagnosis
PULSE AIR VALVE TYPE SYSTEM
1.
Start engine and disconnect electrical connector wire No. 157 from thermo switch as shown in Fig. 1.
2.
Alternately touch the other thermo switch terminal wire No. M157 with the disconnected wire.
3.
A ``humming'' noise should be heard coming from the pulse air valve or diaphragm movement should be noticed through the upper portion of the
pulse air valve. If ``humming'' noise is heard and diaphragm movement is confirmed, connect wire No. 157 to thermo switch.
4.
If the operation is not satisfactory, check the operation of the electrovalve, its electrical current supply, and the vacuum hose connections.
5.
If the tests in step 4 are positive, the valve is at fault and should be replaced.
INSTALLATION NOTE: The arrow which is on the body of the valve should point to the Pulsair valves. The arrow should not be visible when
facing the engine.
