California Models
- With engine at normal operating temperature and idling, place finger over relief air opening in air cleaner and check for presence of air.
- Disconnect vacuum hose from Combined Air Control (CAC) valve and plug hose to prevent engine from stalling. Air should now be discharged from CAC valve if valve is functioning properly.
- Next, connect a hand-held vacuum pump to CAC valve. See Fig 1. Apply 7.9-9.8 in. Hg to valve, then increase engine speed to 3000 RPM. Make sure no air leaks from CAC valve.
- With vacuum applied and engine at 3000 RPM, disconnect and plug air hose at check valve. Air should now leak from CAC valve. If not, replace CAC valve.
Courtesy of NISSAN NORTH AMERICA, INC.