Nissan Maxima QX

1. The diagnostic equipment for check of serviceability of a condition of the catalytic converter is expensive and the extremely difficult in operation. At emergence of suspicions on failure of the converter, drive away the car for check on car repair shop.
2. Each time when the car for any reason rises over the earth, examine the converter on existence of signs of mechanical damages, traces of leaks and corrosion development. Check a condition of welded seams and reliability of a tightening of flange bolts of fastening of the device to sections of system of production of the fulfilled gases. The defective catalytic converter is subject to replacement.
3. Despite reliability of a design of the converter, there is rather high probability of its obstruction. The simplest way of check of passableness of the converter is check with use of the vacuum gage:

a) Connect the vacuum gage to a source of depression of the inlet pipeline (see. Part General major maintenance of the engine of Head Engine);
b) Warm up the engine to normal working temperature, transfer the selector lever to the situation "R" (models from AT), or include neutral transfer (models with RKPP) and cock the parking brake;
c) Consider vacuum gage indications at single turns of the engine;
d) Open a butterfly valve, having lifted frequency of rotation of the engine to 2000 rpm;
e) Quickly release a zaslonka and consider vacuum gage indications;
f) Repeat the described check still three times, each time writing down result;
g) If the result of the fourth measurement appears more than on 2.5 mm of mercury. below the instrument read at single turns, therefore, there is a probability of violation of passableness of the converter, or an exhaust pipe.

See. Head of the Power supply system and release (The section devoted to service of system of production of fulfilled gases).