Service Manual — page 174 of 715

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3-84 FUEL SYSTEM (DFI)
Oxygen Sensor (Service Code 33) (DTC P0130, P0132)

• Remove  the air switching valve [A] (see Air Switching
  Valve Removal in the Engine Top End chapter).
○Do not disconnect the air switching valve connector [B].

• Install the suitable plugs [A] on the fitting of the air suction
  valve covers, and shut off the secondary air.

• Remove   the fuel hose (see Fuel Hose Replacement in the
  Periodic Maintenance chapter).
• Connect  the following parts temporarily.
   Fuel Pump Lead Connector [A]
   Extension Tube [B]
   Air Cleaner Housing (see Air Cleaner Housing Installa-
   tion)
  Special Tool - Extension Tube: 57001-1578

• Warm
  starts.
          up the engine thoroughly until the radiator fan

• Measure the output voltage with the connector joined.
  Output Voltage (with Plugs)
   Standard:       DC 0.7 V or more