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Air Injection System

  1. Check all hoses and connections. Disconnect air by-pass hose from air cleaner. If vehicle is equipped with HAC system, disconnect vacuum hose from lower port of HAC valve, and plug hose end.
  2. Check EACV with engine cold. With coolant temperature below 43°F (6°C), start engine and check that air is discharged from the air by-pass hose.
  3. Check EACV with engine warm including thermo switch (1) and (2) to EACV. Warm up engine to between 64°F (18°C) and 109°F (43°C). With engine idling, check that air is not discharged from air by-pass hose.
  4. Check EACV including oxygen sensor to EACV. Warm up engine to normal operating temperature. Maintain engine speed at 2000 RPM. Check that air is discharged intermittently from air by-pass hose.
  5. Check VCS, race engine and quickly close throttle valve. Check that air is discharged momentarily from the air by-pass hose.
  6. Check TWC thermo sensor to EACV. With engine idling, connect a wire to the TWC terminal and terminal E of the service connector, which is located on the right fender apron behind the battery.
  7. Check that the intermittent air from the air by-pass hose changes to a continuous discharge. Disconnect the wire from the service connector.
Fig 1: Air Injection System Air flow is shown with system "ON".
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