Nissan Maxima QX

1. Check reliability of fastening of electric connections, especially plugs of grounding of a chain of system of injection. Attentively examine all systems concerning functioning electric sockets. Violation of quality of electric contacts involves a set of problems and of more than a half of engine failures is at the bottom.
2. Check level of a charge of the battery. Accuracy of management of structure of an air and fuel mix to a great extent depends on serviceability of functioning of RSM and the information sensors, defined, including, and level of tension of their food.
3. Check a condition of a filtering element of an air purifier, - even partial violation of passableness of the air filter makes essential impact on profitability of fuel consumption and efficiency of return of the engine (see. Head of Control and routine maintenance).
4. Check a condition of the corresponding safety locks. If the safety lock of the pump fused, replace it new. If the new safety lock also fails at once, check chain electroconducting on existence of signs of short circuit (see. Head Onboard electric equipment).
5. Check a condition of the vacuum hoses connected to the inlet pipeline.
6. Disconnect an air sleeve from the case of a throttle and check the last on existence of a nagaroobrazovaniye and other deposits (in particular on sites near a butterfly valve). In case of identification of signs of pollution of the case of a throttle, address to materials of Chapter 6 and make diagnostics of malfunctions of PCV and EGR systems.

On considered models the case of a throttle is processed by special protective structure which is washed away at different use of solvents and liquids for pro-cleaning of carburetors, - application of such means can lead to decrease in efficiency of return of the engine.

7. At the working engine serially hear by means of a stethoscope to each of injection injectors, - the uniform poshchelkivaniye testifies to serviceability of functioning of an injector. In the absence of near at hand stethoscope, use a long screw-driver, simply pressing a tip of her sting to the case of an injector and being guided by vibrations transferred on the handle.

8. At identification of violations of functioning of an injector it is necessary to use a special lamp sampler (ask in shops of automobile accessories). The lamp is connected to the electric socket of a suspected injector. Start the engine and check by means of a lamp all injectors. The uniform blinking of a lamp confirms serviceability of functioning of an injector. Otherwise the car should be driven away on car repair shop for more detailed diagnostics.

9. Muffle the engine, disunite electric sockets of injectors and measure electric resistance of each of them). Compare results of measurements to requirements of Specifications. In case of need replace the failed knot.

10. Additional information on diagnostics of a condition of system of injection contains in Head of the Control system of the engine.