Service Manual — page 625 of 715

Electrical System › Air Switching Valve Unit Test
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ELECTRICAL SYSTEM 16-65
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).
• Connect a tester [A] to the air switching valve terminals
  as shown.
  Air Switching Valve Resistance
    Standard:     20 ∼ 24 Ω @20°C (68°F)
  If the resistance reading is out of the specified value, re-
  place it with a new one.

• Connect  the 12 V battery [A] to the air switching valve
  terminals as shown.

• Blow  the air to the intake air duct [A], and make sure does
  not flow the blown air from the outlet air ducts [B].

• Disconnect    the 12 V battery.
• flow the blown
  Blow  the air to the intake air duct [A] again, and make sure
                    air from the outlet air duct [B].
  If the air switching valve does not operate as described,
  replace it with a new one.
                            NOTE
  ○To check air flow through the air switching valve, just
   blow through the air switching valve hose (intake side)
   [C].