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Land Cruiser

  1. Run engine at idle. Disconnect vacuum hose from Blue side of VTV. Check that air discharges from air by-pass hose within 3-10 seconds. Reconnect hose to VTV and check that air discharge stops quickly.
  2. Disconnect air hose located between air by-pass valve and exhaust pipe at air by-pass valve. Disconnect vacuum hose located between air by-pass valve and VSV 2 at air by-pass valve. Plug valve at vacuum hose port.
  3. Race engine and quickly close throttle. Check that air discharges momentarily from air by-pass valve. Unplug valve and reconnect vacuum hose.
  4. Connect a jumper wire to both terminals of the catalytic converter temperature sensor. Check that air discharges from air by-pass hose. Disconnect jumper wire.
  5. Pinch hose at vacuum switch with fingers and gradually increase engine speed. Check that air stops discharging from air by-pass hose at 2000 RPM. Release hose.
    NOTE: Perform step 5) in as short a time as possible. Engine will misfire slightly while hose is pinched off since deceleration fuel cut off system is on.
  6. Reconnect air by-pass hose to air cleaner and air hose to air by-pass valve. Using a 3-way connector, connect a vacuum gauge to hose located between air by-pass valve and VSV 2. Place gauge in driver's seat.
  7. Road test vehicle observing speedometer and vacuum gauge. At speeds below 35 MPH, vacuum gauge should indicate intake manifold vacuum. At speeds above 50 MPH, no vacuum should be present.
  8. If system performed correctly, testing is complete. If not, check individual components as necessary.
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