Emission Control System On-Vehicle Inspection

Increase the engine speed to at least 3,500 rpm.

Use a sound scope to check for injector operation noise.

Check that when the throttle lever is released, injector operation noise stops momentarily and then resumes.

Standard fuel cut off rpm:

2,500 rpm

Standard fuel return rpm:

1,200 rpm

Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.
If the result is not as specified, replace parts as necessary.

NOTICE:

1. Detachment or other problems with the engine oil dipstick, filler cap, PCV hose and other components may cause the engine to run improperly.
   
2. Air suction caused by disconnections, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will cause engine failure or engine malfunctions.
   

Visually check for loose connections, sharp bends or damage.

Visually check for deformation, cracks or fuel leakage.