Air Pump
- With engine at normal operating temperature, inspect all air injection system hoses, hose connections and air gallery for leaks and damage. Check air pump drive belt tension and adjust as required.
- On California models, disconnect and plug air pump discharge hose at Combined Air Control (CAC) valve. On all models, disconnect air supply hose at check valve and connect air pump test gauge and Adapter (ST19870000) to hose. Tighten hose clamp securely.
Courtesy of NISSAN NORTH AMERICA, INC.
- Position adapter and test gauge so that air emitted through drilled pipe plug will be harmlessly dissipated. Connect a tachometer to engine.
- Start engine and check air pump pressure with engine at 2600 RPM. Pump pressure should be at least 3.94 in. Hg.
- On California models, repair or replace air pump if pressure is not as specified. If pressure is not as specified, on all other models, go to next step.
- With engine speed at 1500 RPM, disconnect tube from test gauge adapter and cover hole of test gauge with finger.
- If a leaking sound is heard, or leaking air is felt by finger at air pump relief valve, relief valve is faulty and should be replaced. If no air leak is noticeable, repair or replace air pump as necessary.