Variable Induction Control Actuator: Testing and Inspection

Fig. 41 Tandem Valve Check:

Tandem Valve Control Diaphragm Test:

1. Check the tandem valve shaft for binding or sticking.
2. Check the by-pass valve for smooth movement.
If any fault is found, clean the linkage and shafts with carburetor cleaner.
3. Disconnect the vacuum hose from the tandem valve control diaphragm and connect a vacuum pump to the diaphragm.
4. Apply vacuum and check that (A) of the tandem valve is in close contact with the stopper when the tandem valve is fully open
5. If any malfunction is found, replace the tandem valve control diaphragm.