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Air Injection: Testing and Inspection

Checking Reed Valves "B" And "C":





SYSTEM INSPECTION



NOTE: Troubleshoot with the Self-Diagnosis Checker before performing the following steps. Check the condition of the wiring harness and/or vacuum lines and connectors before checking the sensors or switches.

1. Warm up the engine.
2. Place a thin paper over the inlet port of reed valves "B" and "C".
3. Increase the engine speed to 1,500 rpm, and check to see that air is being pulled in.
4. Increase the engine speed to 3,000 rpm, and check to see that there is no exhaust gas leaking from the air inlet port.
5. If a malfunction is found, replace the reed valve.
6. Disconnect the vacuum hose from the No. 2 air control valve and plug it.

Checking Inlet Port "D":





7. Place a thin paper over inlet port "D" of reed valve "A".
8. Increase the engine speed to 1,500 rpm, and check to see that air is being pulled in.
9. If it is not, check the No. 1 air control valve, and then check the reed valve.

Checking Inlet Port "E":





10. Disconnect the vacuum hose from the No. 1 air control valve and plug it.
11. Apply 90 mmHg (3.54 in.Hg) vacuum to the No. 2 air control valve, with a vacuum pump.
12. Place a thin paper over inlet port "E" of reed valve "A".
13. Increase the engine speed to 1,500 rpm, and check to see that air is being pulled in.
14. If it is not, check the No. 2 air control valve, and then check the reed valve.

Disconnecting No. 2 Air Control Valve:





15. Stop the engine and disconnect the water temperature switch connector.
16. Run the engine at idle. Disconnect the No. 2 air control valve and check to see that no vacuum is present.
17. Increase the engine speed to 1,500 rpm and check to see that vacuum is present at the vacuum hose.
18. If a malfunction is found, check the ACV solenoid valve.
19. Reconnect the vacuum hoses to the No. 1 and No. 2 air control valves.
20. Reconnect the water temperature switch connector.

Testing No. 1 Air Control Valve:





NO. 1 AIR CONTROL VALVE

1. Remove No. 1 ACV.
2. Connect a vacuum pump to it.
3. Blow air into "A" and verify that air does not come out of "B".
4. Apply 400 mmHg (15.7 in.Hg) vacuum.
5. Blow air into "A" and verify that air comes out of "B".

No. 2 Air Control Valve:





NO. 2 AIR CONTROL VALVE

1. Remove No. 2 air control valve.

Testing No. 2 Air Control Valve:





2. Connect a vacuum pump to it.
3. Apply vacuum gradually, and verify that the stem starts to move at 50 mmHg (1.97 in.Hg) vacuum and stops at 90 mmHg (3.54 in.Hg).


ACV SOLENOID VALVE SIGNAL INSPECTION

1. Warm up the engine and stop it.
2. Connect the connectors of the water temperature switch with a jumper wire.

Voltmeter Connection -- ACV Solenoid Valve:





3. Connect a voltmeter between (Y) terminal of the ACV solenoid valve and ground.
4. Verify that the voltmeter indicates zero volts at approximately 1,500 rpm or higher.
5. If it does not, check the "2J" terminal of the engine control unit.

ACV Valve Location:





ACV SOLENOID VALVE INSPECTION

1. Remove the ACV solenoid valve.

Purge Control Soleniod Test -- Voltage Applied:





2. Connect hoses to the valve as shown.
3. Blow air through hose "B", and check to see that air comes out of the valve air filter.
4. Apply battery power, and ground the valve with jumper wires.
5. Blow air through hose "B", and check to see that air comes out of port "A".
6. If the ACV solenoid does not operate properly, replace it.

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