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System Check: Tercel

  1. Warm up engine to normal operating temperature. Set engine speed at 2000 RPM. Check that air is discharged intermittently from air by-pass hose. Return engine speed to idle and check that air discharge stops.
  2. Disconnect vacuum hose from ASV and check that air discharges from air by-pass valve. Reconnect hose. Air should stop discharging within 2-6 seconds.
  3. Disconnect vacuum hose from air by-pass valve and check that air does not discharge from air by-pass valve. Reconnect hose. Air should momentarily discharge from air by-pass hose.
  4. Pinch hose at vacuum switch with fingers and gradually increase engine speed. Check that intermittent air stops discharging from air by-pass hose at 1600 RPM. Release hose.
  5. Return engine speed to idle. At service connector, located on left fender panel near ignition coil, connect a wire from "TWC" terminal to "E" terminal. Air should discharge from air by-pass hose. Disconnect wire.
  6. Disconnect hose located between check valve and EGR valve at check valve. Check that air is discharging from check valve.
  7. Stop engine and reconnect all hoses. If system performed correctly, testing is complete. If not, check individual components as necessary.
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