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Air Pump System (2ZZ-GE): Inspection

  1. INSPECT AIR PUMP ASSY 
    1. Check the operation.
      1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead from the battery to terminal 2.
      2. Check that the air flows.

    If the operation is not as specified, replace the air pump.

    Fig 1: Identifying Air Pump Connector Terminals
    G02612809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT AIR PUMP RELAY 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION SPECIFICATION

    Tester Connection Specified Condition
    3 - 4 10 kΩ or higher
    3 - 4 Below 1 Ω (Apply battery voltage to terminals 1 and 2)

    If the result is not as specified, replace the air pump relay.

    Fig 2: Measuring Resistance Between Terminals Of Air Pump Relay
    G02612810Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT AIR SWITCHING VALVE ASSY 
    1. Check the operation.
      1. Apply a vacuum of 28 kPa (210 mmHg, 8.27 in.Hg) to port A, then blow air into port B. Check that the air is discharged from port C.

    If the operation is not as specified, replace the air switching valve.

    Fig 3: Applying A Vacuum Of 28 KPA To Port A, Then Blow Air Into Port B
    G02612811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT VACUUM SWITCHING VALVE ASSY 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION SPECIFICATION

      Tester Connection Specified Condition
      1-2 33 to 39 Ω at 20°C (68°F)

      If the resistance is not as specified, replace the vacuum switching valve.

      Fig 4: Measuring Resistance Between Terminals Of VSV
      G02612812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the vacuum switching valve for ground.
      1. Using an ohmmeter, check the resistance between each terminal and the body.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION SPECIFICATION

      Tester Connection Specified Condition
      1-Body 10 kΩ or higher
      2-Body 10 kΩ or higher

      If the resistance is not as specified, replace the vacuum switching valve.

      Fig 5: Checking Resistance Between Each Terminal And Body Of VSV
      G02612813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the operation.
      1. Check that air flows from port E to the filter.

        If the operation is not as specified, replace the vacuum switching valve.

        Fig 6: Checking Air Flows From Port E To Filter
        G02612814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Apply battery positive voltage across the terminals.
      3. Check that air flow from port E to port F.
      Fig 7: Applying Battery Positive Voltage Across Terminals Of VSV
      G02612815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the operation is not as specified, replace the vacuum switching valve.

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