Pulsed Secondary Air Injection: Testing and Inspection

Fig. 41 Testing The Secondary Air Supply System:

SECONDARY AIR SUPPLY SYSTEM INSPECTION

1. Disconnect the air supply hose from the air cleaner and hold a small steel plate at the disconnected hose end to check for air suction. Caution! If the secondary air reed valve is broken hot exhaust may blow back out of the air supply hose.
2. Start the engine and allow to idle.
3. While engine coolant temperature is between 18 and 63 degrees C or 64 and 145 degrees F verify that suction is felt.
4. Allow the engine to warm up until coolant temperature is above 63 degrees C or 145 degrees F.
5. Verify that for the first 70 seconds after engine start suction is felt and that after 70 seconds of operation suction is no longer felt.
6. While the engine is still warm accelerate the engine to 4,000 rpm and verify that suction is felt during sudden engine deceleration.

Fig. 16 Testing The Secondary Air Control Valve:

SECONDARY AIR CONTROL VALVE INSPECTION

1. Remove the secondary air control valve from the vehicle.
2. Blow air into the air cleaner side of the valve and verify that air will not pass through the valve.
3. Connect a hand vacuum pump to the air control valve nipple.
4. Apply 67 kPa or 19.7 in. Hg of vacuum and verify the diaphragm chamber is air tight.
5. Apply a vacuum of 20 kPa or 65.9 in. Hg.
6. Blow air into the valve from the air cleaner side and verify that air passes through the valve.
7. Blow air into the valve from the exhaust manifold side and verify that air does not pass.
8. When reinstalling secondary air control valve tighten to 50 - 60 Nm or 37 - 44 ft. lbs.