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High consumption of the car Nissan X-Trail 2013

High consumption of the car Nissan X-Trail 2013 1
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2013 Nissan X-Trail 2.0 liter, 146 hp.

We requested a diagnosis of the Nissan X-trail with a 2.0-liter engine, 146 hp. The owner’s complaints are: high consumption. They claimed that everything was fine before. Well, I took the car to work. The connection was made through the laptop with ScanMaster for Windows, and here is what it gave out in the settings:

High consumption of the car Nissan X-Trail 2013 2

The engine has warmed up, the onboard system has not detected any errors. There was a deviation in the long-term fuel correction of -5.5%. Such a deviation can be due to a variety of reasons (leaking nozzles, a worn-out mass air flow sensor (DMRV), etc.). Having assessed the situation, I decided to check the voltage at the signal pin of the sensor and to oscillate the signal from the DMRV. This measurement allows you to assess the state of the sensor, identify malfunctions of the electronic part of the sensor.

Preparation for measurements: connect the main probe of the oscilloscope to the signal pin on the DMRV connector, connect the mass probe to the mass pin on the connector.

High consumption of the car Nissan X-Trail 2013 3

The test procedure consists of two measurements. The first measurement is as follows:

turn on the recording of the signal in the recorder mode,

turn on the ignition of the car

wait a few seconds

turn off the signal recording.

High consumption of the car Nissan X-Trail 2013 4

according to the methodology, voltage stabilization should occur in 0.5 milliseconds and the pulse during the transient should be more than 2.5 volts. As can be seen on the attached waveform, voltage stabilization takes more than 0.5 seconds.

the next measurement is carried out with the engine running, and it looks like this:

start the engine, wait for idle speed

turn on the recording of the signal in the recorder mode,

sharply press the gas pedal to the floor, providing maximum throttle opening

release the pedal, wait for the achievement of revolutions XX

Turn off the signal recording.

High consumption of the car Nissan X-Trail 2013 5

According to the methodology, the voltage increase at the signal pin during sharp gas leakage should be at least 4 volts.

After evaluating the results of measurements, I come to the conclusion that the electronic part of the DMRV of this car is faulty, and the sensor must be replaced.

It was also decided to check the quality of sparking. This Nissan Ixtrail has a Coil-and-Plug ignition system (individual ignition coils).

The measurement technique is simple: while the engine is running on the twentieth, we touch the body of the ignition coils with an inductive ruler, evaluate the signal quality.

High consumption of the car Nissan X-Trail 2013 6

Oscillograms of spark burning have no deviations, accumulation time, breakdown voltage, spark burning time, the presence of damped oscillations at the end of the signal – all parameters are normal. Therefore, all components of the ignition system (spark plugs, ignition coils, electrical circuits) are operational.

It is recommended that the vehicle owner replace the DMRV to eliminate these deviations.

Kurakhtanov Igor
© Legion Avtodata

Kostroma, Maly lane, 10
+7 (963) 930-18-21
operating mode 9-21
autodiagnostic44.ru

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