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System Check: Corolla

  1. Warm up engine to normal operating temperature. Set engine speed at 2000 RPM. Check that air is discharges intermittently from air by-pass hose.
  2. Race engine and quickly close throttle. Air should discharge briefly from air by-pass hose. Run engine at idle. Disconnect vacuum hose located between VTV and 3-way connector at VTV.
  3. Check that air discharges from air by-pass hose within 15-25 seconds for Green-labled VTV, 30-55 seconds for Red-labled VTV or 50-90 seconds for Pink-labled VTV. Reconnect hose and check that air stops discharging after a few seconds.
  4. At service connector located at corner of left dash panel, connect a wire from "TWC" terminal to "E" terminal. Air should discharge from air by-pass hose. Disconnect wire.
  5. Pinch hose at vacuum switch with fingers and gradually increase engine speed. Check that intermittent air stops discharging from air by-pass hose at 2200 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. Stop engine and reconnect all hoses. If system performed correctly, testing is complete. If not, check individual components as necessary.
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