Checking P.C.V. System (Cont'd) / Checking Vacuum Hoses / Checking A.T.C. Air Cleaner
MA-25prose procedureChecking Positive Crankcase Ventilation (P.C.V.) System (Cont'd)
Checking Ventilation Hoses
- 1Check hoses and hose connections for leaks.
SMA304C - 2Disconnect all hoses and clean with compressed air. If any hose cannot be freed of obstructions, replace.
Changing Positive Crankcase Ventilation (P.C.V.) Filter
Remove air cleaner cover and replace P.C.V. filter.
Checking Vacuum Hoses and Connections
Check vacuum hoses for improper attachment and for leaks, cracks, damage, loose connections, chafing and deterioration.
Checking Automatic Temperature Control (A.T.C.) Air Cleaner
- 1Inspect vacuum hoses (Intake manifold to temperature sensor and vacuum motor) for secure connections.
SMA953A - 2Check each hose for cracks or distortion.
- 3Check A.T.C. system for proper function.Make sure that air control valve moves when engine is raced under no-load.Make sure that air control valve partially rises as engine warms up.
Refer to AUTOMATIC TEMPERATURE CONTROL (A.T.C.) AIR CLEANER SYSTEM INSPECTION in EF & EC section.
A.T.C. air control valve operation
Stopped
TemperatureAny
Air control valve positionClosed
Intake air temperature
At idle
TemperatureLow
Air control valve positionOpen
Intake air temperatureHot
At idle
TemperatureHigh
Air control valve positionClosed
Intake air temperatureCool
See also
AUTOMATIC TEMPERATURE CONTROL (A.T.C.) AIR CLEANER SYSTEM INSPECTION (EF & EC)