Air Switching Valve
Air Switching Valve Operation Test
Refer to the Air Suction System Damage Inspection in the
Periodic Maintenance chapter.
Air Switching Valve Unit Test
Remove the air switching valve (see Air Switching Valve
Removal in the Engine Top End chapter).
Set the hand tester [A] to the × 1 Ω range and connect it
to the air switching valve terminals as shown in the figure.
Special Tool - Hand Tester: 57001-1394
Air Switching Valve Resistance
18 ∼ 22 Ω at 20°C (68°F)
If the tester does not read as specified value, replace it
with a new one.
Connect the 12 V battery [A] to the air switching valve
terminals as shown in the figure.
Blow the air to the inlet air duct [A], and make sure does
not flow the blown air from the outlet air duct [B].
Disconnect the 12 V battery.
Blow the air to the inlet air duct [A] again, and make sure
flow the blown air from the outlet air duct [B].
If the air switching valve does not operate as described,
replace it with a new one.
To check air flow through the air switching valve, just
blow through the air switching valve hose (inlet side)
ELECTRICAL SYSTEM 16-71