Nissan and Datsun Workshop Service and Repair Manuals

Deceleration Valve: Testing and Inspection
Vacuum Control Valve

VACUUM CONTROL VALVE

1.

Disconnect air regulator side of air hose connecting 3-way connector to vacuum control valve.

2.

Check that vacuum control valve operates when engine speed is decreased from 3500-4000 RPM to idle, by placing fingers on end of hose.

3.

If there is no vacuum at end of hose, replace vacuum control valve.