System Testing
- Disconnect the lower air suction hose from anti-afterburn valve and plug. Remove air cleaner cover and filter. Start the engine and check for a bubbling noise at air suction port at idle. A bubbling noise should be heard. If so, proceed to step 4).NOTE: For California vehicles only, perform this test on cold engine only. On Federal and Hi-Altitude cars only, if the engine is hot, check for the bubbling noise within 3 minutes after starting the engine.
- If bubbling noise is not heard, check for voltage at air suction control valve (Yellow/Green wire). If there is no voltage, proceed to Troubleshooting. If voltage is present, disconnect vacuum hose from air suction diaphragm.
- If there is no vacuum, check for leaks or disconnected hose. If okay, replace air suction control solenoid valve and retest. If there is vacuum replace the air suction cut-off diaphragm and retest.
- Raise engine speed to above 3150 RPM. A bubbling noise should not be heard. If noise is not heard, test is complete. If bubbling nose is heard, check for voltage at air suction control solenoid valve (Yellow/Green wire).
- If there is voltage, go to Trouble Shooting. If there is no voltage, replace the air suction control valve and retest.