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Intake Air Control Valve System: Non-Turbo

  1. Using vacuum "T", connect vacuum gauge in vacuum line to the actuator valve, located on side of air intake chamber. See Fig 1. Start engine. With engine idling, ensure no vacuum reading is obtained.
  2. Fully open throttle and ensure vacuum reading momentarily reads at least 9.8 in. Hg and actuator valve rod pulls downward. If actuator valve rod fails to pull downward, go to next step.
    Fig 1: Intake Air Control Valve, VSV & Vacuum Tank ID (Non-Turbo)
    G93I79564Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Disconnect vacuum hose from actuator valve, located on side of air intake chamber. It may be necessary to remove air intake chamber for access to actuator valve.
  4. Using vacuum pump, apply approximately 16 in. Hg of vacuum to actuator valve. Ensure actuator valve rod pulls downward and remains pulled downward for at least one minute.
    NOTE: If actuator valve rod does not move downward, it may be necessary to rotate adjusting screw near the shaft located in the air intake chamber. See Figure.
  5. Replace actuator valve if defective. If actuator valve operates correctly, reconnect vacuum hose and go to next step.
  6. Disconnect vacuum hoses from vacuum tank, located below air intake chamber. See Figure. Apply air pressure to port "A" on vacuum tank. Ensure air passes out port "B". Perform STEP 1. See Fig 2. Apply air pressure to port "B". Ensure air does not pass out port "A". Perform STEP 1. See Fig 2.
  7. Plug port "B" on vacuum tank. Using vacuum pump, apply approximately 16 in. Hg of vacuum to port "A". Perform STEP 2. See Fig 2. Ensure vacuum reading holds for at least one minute. Replace vacuum tank if defective and recheck system operation. If vacuum tank is okay, reconnect vacuum hoses and go to next step.
    Fig 2: Checking Vacuum Tank (Non-Turbo)
    G93J79565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Disconnect electrical connectors from intake air control valve Vacuum Switching Valve (VSV), located near vacuum tank. See Figure. Using ohmmeter, ensure continuity exists between electrical terminals on VSV and resistance is 39-45 ohms. Check that no continuity exists between each electrical terminal and body of VSV.
  9. Apply air pressure to port "B" and ensure air passes out filter. Perform STEP 1. See Figure. Connect battery voltage to VSV terminals. Apply air pressure to port "B" and ensure air passes out port "A". Perform STEP 2. See Figure. Replace VSV if defective and recheck system operation.
  10. If VSV is okay, check for defective wiring circuit to VSV. See appropriate wiring diagram in WIRING DIAGRAMS article.
  11. The Engine Control Module (ECM) controls the intake air control valve VSV ground circuit on the Green/Yellow wire. ECM is located below passenger's side of instrument panel, underneath carpet on floor. If necessary to check EFI main relay, see EFI MAIN RELAY  under RELAYS. Repair as necessary and recheck system operation.
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