How to independently perform self-diagnosis of Nissan Primera P12

Knowing step-by-step instructions on how to perform self-diagnosis of the Nissan Primera P12 can be useful to every owner of this model if it is not possible to contact specialists, and the car system requires checking.
Of course, in a car service center such diagnostics are carried out using special equipment, and for a certain amount they will do everything quickly and efficiently. But what if trouble strikes you on the way, and it is necessary to identify errors in the operation of various compartments as quickly as possible in order to understand what is happening and what the threat of further operation is: in a word, to decide on further actions so as not to harm the car and avoid unplanned repairs. How to do self-diagnosis of Nissan Primera P12 in order to read errors yourself? Everything is quite possible, you just need to understand how to do everything step by step. Our step-by-step instructions will help you with this issue. Self-diagnosis is carried out by counting the blinking of the Check-Engine indicator. Then we add up the received data and analyze it, and in a special plate we find the interpretation of the error shown by the light bulb.

How to perform self-diagnosis on Nissan Primera P12? It's time to learn how to do it

Knowing step-by-step instructions on how to perform self-diagnosis of the Nissan Primera P12 can be useful to every owner of this model if it is not possible to contact specialists, and the car system requires checking. Of course, in a car service center such diagnostics are carried out using special equipment, and for a certain amount they will do everything quickly and efficiently. But what if trouble strikes you on the way, and it is necessary to identify errors in the operation of various compartments as quickly as possible in order to understand what is happening and what the threat of further operation is: in a word, to decide on further actions so as not to harm the car and avoid unplanned repairs. How to do self-diagnosis of Nissan Primera P12 in order to read errors yourself? Everything is quite possible, you just need to understand how to do everything step by step. Our step-by-step instructions will help you with this issue. Self-diagnosis is carried out by counting the blinking of the Check-Engine indicator. Then we add up the received data and analyze it, and in a special plate we find the interpretation of the error shown by the light bulb.

How to start the self-diagnosis process?

The verification process itself is preceded by a certain procedure to start the mode.

• Turn off the ignition for at least 10 seconds;
• Insert the key into the ignition again and turn it to “ON” for 3 seconds;
• Next – 5 pressures in 5 seconds: press the gas pedal all the way to the floor;

If we want to reset the error code, press the gas pedal for 10 seconds. To exit the self-diagnosis mode, turn the ignition key to the “OFF” position. Or - another option - we start the engine, the Check-Engine indicator goes out.

Self-diagnosis Nissan X-trail

After purchasing my Nisan X-trial, I began to slowly study the features of the car, taking into account the fact that my knowledge in car repair was reduced to zero. But multiple forums and discussions on small faults helped a lot in studying this matter.

Today I would like to consider the question of how to do self-diagnosis on a Nissan X-Trail with analysis of error codes that can be identified during self-diagnosis and ultimately determine what the problem is with a particular vehicle unit.

• After warming up, turn off the engine and turn the key completely to the “off” position and wait a little more than 10 seconds.
• Next, turn the key to the ON position, but do not immediately try to start the car, wait 3-4 seconds.
• In the next five seconds, quickly and fully press and release the gas pedal, doing this 5 times in a row.
• Having completed the gas operation, count down another 7 seconds and press the gas firmly while holding it until the yellow “CHECK” light comes on, which starts flashing and at the same time you can read the error codes of your Nissan x-trial.
• After reading the codes, the car can be started.

How to read self-diagnosis codes for Nissan ISK trial?

The transition to self-diagnosis is indicated by the blinking of the Check lamp. To read codes during self-diagnosis, you need to release the gas pedal when the lamp starts flashing. If there are any errors in the car, then the codes will be displayed sequentially, and if everything is in order, then the light should blink exactly 40 times in one mode, i.e. without pauses.

How to test the oxygen sensor on Nissan X-trial?

It is after diagnosing it yourself and starting the engine that you can test the oxygen sensor. More precisely, we warm up the engine, turn off all additional devices (music, lights, etc.), bring the speed up to 2000 and hold it for 2 minutes. In this case, you need to make sure that the CHECK light in your trail blinks for 10 seconds more than five times at 2000 rpm.

How to reset error codes after self-diagnosis on a Nissan X-trial yourself?

To reset errors after you have counted them, you need to press the gas pedal with the car not running and hold it for several seconds and then start the engine. But this method will not solve your problem, because... This is a temporary solution to the problem and after identifying the cause of the malfunction, it must be eliminated so that the computer no longer shows this or that error.

Reading error codes

In self-diagnosis mode, as mentioned above, flashes of the corresponding indicator light indicate 4-digit codes. In the first digit, the duration of the barrel winks is longer than the subsequent ones. And the numbers themselves are divided into intervals of 1 second, and the codes are divided into approximately 2 seconds. If there are several errors, then they are encoded one after another. “Zero” (no fault) is indicated by 10 flashes.

For example, Nissan Primera!

• Problems with the air flow meter: either in the circuit, or not regulated, or low/high reading – P0100 – P104;
• The air pressure sensor has failed or is failing – P0105. High/low signal level – P0107
  ,
  P0108
  .

And further, according to the list (and it consists of many positions - it is quite long, so there is no point in citing it in full in this article). A complete table to decipher possible errors, as already recommended, should be on hand just in case, in the glove compartment, for example. Who knows what might be useful on a long journey? In addition, it is not always possible to find appropriate equipment between populated areas or in small towns.

Therefore, knowing how to self-diagnose a Nissan Primera P12 is not as useless as some, especially novice drivers, think. Like, I still won’t delve into the insides of the car, but at the service station they will do the diagnostics much more thoroughly and professionally. But thinking like this is a gross mistake, because self-diagnosis of the engine, carried out in time (if you find the wrong sound or leak, for example, on the road), can suggest the sequence of further actions and save you from more serious system problems, leading, accordingly, to more serious costs.

Common Almera Classic errors

Nissan Almera Classic experiences various malfunctions. They are identified using diagnostics, in the form of a code. Moreover, each error has its own interpretation.

Error P0340

The occurrence of error P0340 on the Nissan Almera Classic is caused by a malfunction in the camshaft position sensor circuit. The cause of the formation may be the sensor itself, the electronic control unit, or a break in the electrical circuit. In order to clear the error, it is recommended to try temporarily removing the negative terminal of the battery. If this fixes the problem, then the reason is a false operation of the ECU; if not, then you will need to check the contact part of the electrical circuit, the integrity of the wires and the sensor itself.

Camshaft sensor

Error P0335

If the Almera Classic diagnostics ended with error P0335, then you will need to check the crankshaft position sensor and auxiliary equipment. There are many reasons for recording an error. From a banal lack of contact in the chain, ending with a stretched timing belt. In this case, the check will appear only after the second error has been recorded.

Characteristic symptoms of Almera Classic functioning with error P0335:

• The engine stalls periodically
• fuel consumption increases
• the traction of the power unit decreases
• the motor does not start.

Crankshaft position sensor

Error P0350

If the ignition coil fails or the power supply circuit is disrupted, error P0350 will appear. This malfunction will lead to a decrease in the power of the power unit. A fault detection factor is a deviation of the voltage on the coils by more than ten percent from the factory values. You can fix the problem after checking the condition of the wiring and ignition coils.

Ignition coil

How to Reset Error on Nissan Primera P12

Knowing step-by-step instructions on how to perform self-diagnosis of the Nissan Primera P12 may be necessary for every owner of this model, if there is no ability to contact specialists, and the car system requires checking. Of course, in a car service, such diagnostics are performed using special equipment, and there, for a certain amount, they will do what remains for our client to do quickly and perfectly. However, what if a failure occurred during the drive, and it is necessary to identify errors in the operation of different compartments more quickly in order to understand what is happening and what is threatening the upcoming operation: in a word, decide on subsequent actions so as not to harm the car and even avoid unexpected repairs.

How to do self-diagnosis of Nissan Primera P12 in order to count errors without the help of others? Our client remains realistic, it is only necessary to realize how step by step what remains to be done for our client to do. Our step-by-step annotation will help you with this process. We carry out self-diagnosis by counting the flickers of the Check-Engine indicator. Then we add up the acquired data and analyze it, in a special plate we find the interpretation of the error shown by the light bulb.

The process of implementing the verification itself is preceded by a certain procedure to start the mode.

• Turn off the ignition like in a movie theater for 10 seconds;
• Insert the key into the ignition again and turn it to “ON”. 3 sec.;
• Next - 5 pressures in 5 seconds: press the gas pedal all the way to the floor;
• We wait 7 seconds. and once again depress the appropriate pedal one hundred percent, holding it for 10 seconds. in a recessed position (the Check-Engine indicator should blink);
• Tip:
  it’s best to count seconds with a stopwatch (for example, on a phone or a watch). Alas, you can also pronounce at a leisurely pace: 1, 3.5, 3, etc.;
• We release the pedal completely and count the number of blinks of the Check-Engine lamp. There will be a lot of them - short and long. The main thing: do not yawn and look closely, reading possible errors.

Nissan Primera p12. Clearing the error

Note:

the absence of one or another error is accompanied by a 10-fold flicker in a row. And one more thing: defect codes are 4-digit and consist of short and long flickers.

If you want to reset the error code, press the accelerator pedal for 10 seconds. To exit the self-diagnosis mode, turn the ignition key to the “OFF” position. Or - another option - we start the engine, the Check-Engine indicator goes out.

When working in self-diagnosis mode, as mentioned above, flashes of the corresponding indicator light indicate 4-digit code characteristics. In the first number, the duration of the barrel winks is longer than the next ones. And the numbers themselves are separated by intervals of 1 second, and the codes are separated by approximately 5 seconds. If there are several errors, then they are encoded in a string. “Zero” (no fault) is indicated by 10 flashes.

It is better to have a table of error codes nearby in your apartment (usually it is published in the instruction manual - it is better if in Russian). The error number consists of a Latin letter and 4 digits. What do they mean?

• Letter P – malfunction under the hood and gearbox;
• 1st digit – main SAE code;
• The next reason is a number:
  if 1 or 5, then there is a problem with the supply of air or fuel (injector). If 3 – problems in the ignition system. 4th – with control of the exhaust process, 5 – speed and idle. 6 – ECU. 7, 8 – with box;
• The last two numbers on the right indicate a specific error code.

• Problems with the air flow meter: as it is also called in the circuit, or not regulated, otherwise low/high indicator - P0100 - P104;
• The air pressure sensor has come out, in other words, it is burning out. P0105. High/low signal level. P0107
  ,
  P0108
  .

Secrets of resetting the airbag error Nissan primera p12

And further, according to the list (and it consists of a huge number of positions - it is quite long, so it makes no sense to list it completely below). A complete table to decipher possible errors, as already recommended, should be kept nearby, just in case, in the glove compartment, for example. It is quite possible that you might need it on a long journey? Also, not necessarily between populated areas, but in small towns it is possible to find the appropriate equipment.

Therefore, knowing how to do self-diagnosis of the Nissan Primera P12 is not as worthless as some, especially novice drivers, think. They say, I won’t continue delving into the insides of the car, but at 100 they will do the diagnostics much more thoroughly and professionally. However, thinking like this is a gross mistake, since self-diagnosis of the engine, carried out on time (if you find the wrong sound or leak, for example, on the road), can give a hint to the sequence of subsequent actions and save you from more severe problems of the accounting system, leading, respectively , to more severe costs.

Troubleshooting Example P12 European and resetting errors?

Hello. Nissan Primera P12, 2007 1.6l, manual transmission, Europe.

Lately, the following periodically appeared: when accelerating sharply, the car began to twitch (not always): as if there was not enough gasoline or air to create the desired mixture. I even sinned on gasoline (gas industry: sometimes 92, sometimes once a week 95 th) Iridium spark plugs were changed in the fall of 2020, at the same time the injectors were cleaned, the air filter was replaced in February 2016. Today I decided to clean the Throttle indiscriminately: I sprayed (with the engine not running) ABRO carb cleaner on the damper, wiped everything with a cloth. After that, it didn’t start on the first try. The check has warmed up. Electronic pedal. It turns out to be a weak gas, but up to 3000 rpm maximum, it doesn’t go further. When you try to start: the car tries to stall. The check light is on the display. Reset the terminal for more than 15 minutes. I started it right away, it holds the revs well and accelerates perfectly. The check does not light up. Just trying to get going: the check light comes on. And the car does NOT want to go. Who can tell me how it is possible (step by step) to carry out diagnostics and possibly reset the error? What could be the reason ? I have cleaned the throttle body more than once in this way: everything was OK. Perhaps something is “thinking”.

Change the fuel pump. To be sure, measure the fuel pressure. But I think he's to blame. You change it there with a block with a filter. Like 12 rubles.

I don't think it's the fuel pump! In the fall I pulled it out of the tank: everything was clean. I cleaned it indiscriminately (it’s impossible to disassemble it) with a cleaning agent. If the fuel pump were to blame, then: there were constant jambs (there were twitches). And it happened to me very periodically. The check came on only after trying to clean the Throttle. I retrained the pedal: the check went out. Gas: everything is ok. After I try to go for a ride, the speed drops to emergency mode and doesn’t want to go: that is, it can drive slowly without accelerating. I believe that the joint is buried somewhere in the throttle area. The car sat overnight: it started up perfectly, it keeps the revs just right when cold! He said: everything is ok. The check didn't light up. I just tried to drive it: the revs immediately dropped and the check light came on. In this regard, I ask: 1. how can I carry out diagnostics myself (step by step) (it seems possible) 2. how can I reset the error from memory.

Maybe there are specialists in Omsk who can identify the error?

There is a thread about self-diagnosis.

I looked around on the Internet, but somehow got confused and not very good. It's clear. If it’s not difficult: you can send it (if it’s realistic to step by step both the diagnostic process yourself and the process of resetting the error from memory). Thank you

sec. 0. Turn on the ignition. 3. Press the gas pedal all the way 5 times within 5 seconds. 15. Press the pedal all the way and hold it until the light goes out, then release. (if you hold it further, the lamp will light up again after a while, after which you can start it and the throttle learning procedure will begin).

Then you read the 4-digit codes. The first digit is in long flashes.

Greetings. Yesterday I tried to enter the diagnostic system using these seconds more than a dozen times. mode: NO DAMN. Probably a scanner is needed: to identify the error and reset it.

You're doing something wrong. Here you need a stopwatch and training)

I’m already with a stopwatch and this way and that and without it: I’m already counting down the seconds like the Kremlin chimes -)))))). Well, what should I do, Yuliiiiin: in the evening I’ll learn to count second by second again

Bugs fixed! Some wiring going to the throttle was broken. Lost. Errors cleared: EVERYTHING works!

Dear forum users. Help me solve the problem with the throttle valve on Nissan Primera P12, 1.6, 109 l, 2007. It all started when error 0221 began to appear periodically, after surfing the forums I solved the problem by manipulating the ignition switch and gas pedal. While using the car, I noticed that the problem occurs in wet weather. I traveled all winter without any problems and now spring has come. At the moment, error 0221 has appeared and does not go away, while the engine goes into safe mode and it is impossible to drive, not, well, possible, but not more than 20 km/h. Now about what has already been done: resetting the error does not help, training the remote control does not help, replacing the remote control does not help, the wiring from the remote control to the ECU has been rung, everything is clean, there are no breaks, all plugs and chips have been checked, tightened, the switches click, when the ignition is turned on and off, the damper walks. Yes, I almost forgot, maybe this is important, sometimes it starts up well without errors, but as soon as you put in any gear (manual transmission), error 0221 immediately appears. There are no other errors. Help out, forum members, I’m already completely desperate. Where else can you climb, where to look, what to pay attention to.

How to check?

One of the main reasons to diagnose a Nissan car is the illuminated Check Engine icon on the instrument cluster. To read error codes, either a special scanner is used, connected to a connector in the vehicle’s on-board network, or a special self-diagnosis system. Deciphering Nissan error codes will allow you to identify the failed unit and carry out repairs.

On some Nissans, for example, the Sunny model, owners are unable to enter self-diagnosis mode. To read errors on them, an ELM scanner is used, which is inserted into the diagnostic connector. Error data is transmitted to a regular laptop or smartphone.

Auto Selection 24 RF shows in this video the diagnostics of a Nissan Murano.

Reading errors in self-diagnosis mode

Launching the diagnostic mode on the Nissan Primera P12 is done as follows:

1. Turn on the ignition and wait 3 seconds.
2. Press and release the gas pedal 5 times within 5 seconds.
3. 7 seconds after the last press, fully press the gas pedal again and hold it for 10 seconds.
4. If everything is done correctly, the Check Engine icon will start flashing on the Nissan Primera P12 instrument cluster.
5. Release the gas pedal.
6. The blinking icon indicates error codes in four-digit format. The first digit of the code is shown in long flashes, followed by the digits of the second character, etc., which are shown in short flashes. There is a 2 second break between the display of numbers. The number of flashes is equal to the value of the number in the error code, except for the number 0 - it is indicated by ten flashes. If there are several errors, they will be displayed sequentially.
7. You can reset errors by pressing the gas pedal for 10 seconds while remaining in diagnostic mode. The Check Engine icon will show code 0000.
8. Turn off the ignition.

For example, error code 1514 (open in the engine idle speed control signal circuit) will be displayed as:

• 1 - one long flash, then a pause of almost 2 seconds.
• 5 - five short flashes with an interval of 1 second, after which there will be a pause for 2 seconds.
• 1 - one short flash and a pause for 2 seconds.
• 4 - four short flashes every 1 second each.

Error codes are read in the same way on the following Nissan models:

• Tiida;
• Almera H16 and Almera Classic;
• Laptop;
• Ixtrail;
• Qashqai;
• Teana;
• Murano;
• Navara.

The video (author Nikolai Nikolaevich) shows the procedure for reading errors on a 2007 Nissan Tiida.

On the earlier Nissan Primera P11, the procedure for reading errors is different:

1. Simultaneously press and hold the daily mileage reset and clock settings buttons.
2. Turn on the ignition and release the buttons.
3. Self-diagnosis will start, during which the speedometer, tachometer and fuel level needles will simultaneously move from the minimum reading to the maximum and back.
4. The error code is displayed on the odometer screen by pressing any button on the combination - the first press shows the software version, the second will display the error codes directly on the screen.

It should be remembered that engine errors on P11 are not read this way. Another procedure is used for this:

1. Turn on the ignition.
2. Open the cover of the fuse box in the driver's left foot area.
3. Place a jumper in the diagnostic connector between the IGN and CHK contacts. On pre-restyling P11s, it is necessary to close the rightmost contacts in the top row. On restyled P11 144, the leftmost and rightmost contacts in the bottom row of the block are closed.
4. After two seconds, remove the jumper.
5. By flashing the Check Engine light, you can determine the error code. Long flashes give the first character of the code, short ones - the second. The number of flashes corresponds to the meaning of the symbol. On the restyled P11 144, the error codes will already be four-digit.
6. Turn off the ignition.

On a right-hand drive Nissan Winroad, equipped with a mechanically driven gas pedal, errors are also displayed by closing the pins in the diagnostic contact. The connector has a slightly different appearance.

Close pins 1 and 8

The video from Alexey Nikitin demonstrates self-diagnosis on a 1999 Vinroad with a 1.8 liter gasoline engine.

Reviews from car owners

1. Grigory. Tula. Example 2002. QG18DE. P0120 Malfunction of the throttle position sensor circuit/switch A. The error appeared the next day after replacing the circuit, while driving, the car suddenly lost speed (did not gain more than 3000) and the gearbox went into emergency mode (did not move more than 30). I got to the service center, while we were talking, I started it - everything works fine, it drives too: there are no active errors, P0120 is in the memory. They sentenced the TPS, changed it - everything is fine, until the next day... Again emergency mode, again at the service station, the result is a poorly screwed mass on the intake manifold, the “specialists” made it after replacing the chain and forgot to tighten it.
2. Ivan. Volgodonsk. Nissan Primera P12-QR25, diesel. P1232 – low pressure of the fuel pump. It started after a series of refills of unknown quality diesel fuel. The symptoms grew gradually, at first it stalled when releasing the gas, jerking when driving smoothly, and then began to choke even when accelerating. It ended up stalling at one point at a traffic light and refusing to start at all. Pressure measurements at the service station showed extremely low results (at all points) and after long discussions, it was decided to replace almost the entire fuel system (except for the injectors, which were used on a stand). Preliminary attempts to restore operability by repair did not yield results; it was necessary to change the primary pump, injection pump, pressure regulator and fuel filter.
3. Andrey. Tyumen. Nissan Primera (P12) 2004, 1.6. Error p1614 - immobilizer (key) not detected. The emergency vehicle refused to start after restoration and a long period of inactivity. The ignition and starter were blocked. After numerous consultations, it was determined that the part of the ECU responsible for NATs (immo) burned out, most likely after welding work. After some minor repairs and reflashing the ECU to work without an immobilizer, the car started, but a new control unit with keys was still ordered.
4. Yaroslav. Moscow. Nissan Primera II (P11). Error P0121 – Incorrect signal from the throttle position sensor or accelerator pedal (out of possible limits or too slow response). The problem was that after cleaning the throttle assembly again, the engine began to respond inadequately to the gas pedal. Attempts to enter the self-diagnosis mode were unsuccessful, but after connecting the scanner, the reason became clear. When removing and installing the throttle position sensor, the contact tracks were damaged, which affected the operation of the entire unit and the control unit could not enter diagnostics due to broken timings. After replacement and adaptation, everything worked as it should.

How to decrypt correctly?

On early Nissan cars, for example, on the Primera P11, the received error from the instrument cluster must be converted into binary code, which deciphers the type of malfunction. An example of decoding the Nissan error code with code 141 is below.

Decoding error code 141 on Nissan Primera P11

In addition, some errors can be deciphered from the table without converting them into binary code.

Four-digit codes of more modern machines can be deciphered using tables that are constantly updated by the manufacturer.

Sensors

On the Murano Z50, error P1051 is often encountered, signaling a malfunction of the first oxygen sensor. There is only one way to correct the error - replacing the sensor. A common error for older cars is 0115, indicating a breakdown of the temperature sensor. This problem affects both left-hand drive and right-hand drive cars, such as the Nissan March. On Nissan Qashqai and other cars, error P1147 occurs, which is accompanied by a slight increase in fuel consumption. This error signals the failure of the second lambda probe located behind the catalyst.

On the newest Nissan X Trail T31 from 2014 and newer, directional stability sensor error C1145 occurs. When replacing this sensor, you need to carefully look at how the old one was installed, since it only functions in one position.

Engine problems

Nissan ADs often encounter problems with the YD22 diesel engine installed on them. Error codes on this machine are displayed using a jumper in the diagnostic connector. The list of possible errors is below.

The QR20 engine is used in many Nissan cars, including the Almera Classic, which has error P0340. For a similar engine on the X Trail T30, the following errors are typical.

QR20 error codes

Problems with electrical wiring

A similar problem is error U1000, in which the car starts, but the Check Engine symbol is on while driving. One of the owners experienced this error on a 2002 Almera N16 with a manual transmission after replacing the central control unit. The cause of the problem was the use of a block from a car with an automatic transmission. On one of the 2011 Nissan Teanas, the cause of this error was poor contact in the control unit wiring. In any case, the cause of such an error can only be determined through a full diagnosis.

On a diesel Nissan Qashqai 2009 with a 1.5-liter diesel engine, error C1130 was observed together with C1131. The reason was oxidized contacts on the ESP system unit and on the exhaust gas sensor. Occasionally, error B2082 occurs, associated with a malfunction of the sensors in the back of the passenger seat.

CAN bus faults

One of the most common errors on Nissan Note is U1001, in which case the car may not start, stall, or not maintain idle speed for a year. This error indicates problems in the operation of the vehicle's CAN bus - there is no connection between the control unit and the rest of the electrical system units. The cause may be damage to the wiring or failure of the unit. Only a qualified diagnostician can indicate the exact cause. When the battery charge was low, error 1212 was recorded on several Nissan Micras, which indicates a lack of communication between the ABS and TCS units via the CAN bus.

Other problems

Driver airbag error B1049 is common on Nissan vehicles. The cause of this problem on one 2008 Nissan X Trail was a damaged cable in the steering wheel. After replacing the cable the problem disappeared. You should not delay replacing such a part, since a faulty driver’s airbag will cause the entire vehicle’s safety system to malfunction.

On the Nissan Pathfinder R50 and R51, the cause of errors may be a malfunction of the automatic transmission. In this case, a more thorough diagnosis with the participation of a qualified specialist is required. If the ABS system sensors fail, the system malfunction lamp lights up, and error C1046 remains in the on-board computer. It can be corrected by replacing the sensor; occasionally cleaning it from dirt helps.

Nissan - diagnostics and self-diagnosis

From the very beginning, Automotive decided to complicate life for both car enthusiasts and auto mechanics, because initially it used methods and methods of self-diagnosis that were quite inconvenient and not always understandable to the “simple” driver. Even now, when encountering some kind of malfunction on a Nissan manufactured before 1993, many auto mechanics try to avoid self-diagnosis, because without “getting inside” all the principles of self-diagnosis, it is almost impossible to correctly read the code or fault codes on Nissans that have a computer such as in the above figure. The electronic control unit on Nissan models can be located:

* under the passenger seat; * behind the false panel “to the left of the passenger’s left foot.”

There are several self-diagnosis modes available.

Selecting the desired self-diagnosis mode - Turn on the ignition; — Make sure that the mode selector is in the extreme left position. If this is not the case, put it in the extreme left position and turn the ignition off and on again; — Turn the mode selector to the extreme right position; - The LEDs inside the computer will begin to flash simultaneously (light flash) - for example: flash - an interval of two seconds - flash - an interval of two seconds - mode No. 1. two flashes - an interval of two seconds - two flashes - an interval of two seconds - mode No. 2. And so on. — If, after the LEDs initiate the desired self-diagnosis mode, we turn the mode selector from the extreme right position to the extreme left position, then we will “enter” the self-diagnosis mode we need. 1. Mode No. 1 : checking the functionality of the oxygen sensor (Oxygen sensor) - Turn on the ignition, start the engine and let it warm up to normal operating temperature; — The mode selector is in the extreme left position; — If the green LED is lit, then the Oxygen sensor is working and is in good condition; — If the green LED is NOT lit, then this indicates that the oxygen sensor has failed and the computer is currently calculating the amount of fuel for the engine to operate by default, that is, according to the average indicators that are stored in its memory. 2. Mode No. 2 : checking the quality of the fuel-air mixture - Start the engine and let it warm up to operating temperature; The red LED should “blink” 2 times per second; — If the red LED does not light, then the fuel-air mixture is rich; — If the red LED is lit, then the fuel-air mixture is lean; If two LEDs are lit at the same time: red and green, then the composition of the fuel-air mixture is ideal; 3. Mode No. 3: self-diagnosis mode of the engine and automatic transmission - When entering mode No. 3, the self-diagnosis system flashes red and green LEDs to “indicate” a malfunction. For example: one flash of a red LED and three flashes of a green LED - this is code 13 (engine coolant temperature sensor malfunction). Ten flashes of the red LED and five flashes of green - code 105 (exhaust gas recirculation (EGR) valve malfunction). 4. Mode No. 4 : checking control sensors - After entering this mode, the control sensors are checked: - “IDL” contact of the throttle position sensor (TPS); — Vehicle speed sensor. 5. Mode No. 5 : checking the serviceability of the electronic engine control system in real time. A test drive is performed, during which, in case of any malfunctions, you can read the code or fault codes directly while driving, for example, the System may show code 32 - Exhaust gas recirculation (EGR) valve malfunction.

Erasing self-diagnosis codes On different car models and different years of manufacture, as well as their configuration and “direction” (that is, for which countries the car is intended), erasing fault codes can also occur in different ways. — Disconnect the battery for a period of at least 24 hours; — Being in the state of self-diagnosis mode No. 2, go to the state of mode No. 1; — simply disconnect the battery for up to 3 minutes. Fault codes: You should be very careful about the correspondence of the fault table for each specific engine, because on Nissan cars of different years of manufacture, with different configurations, they can differ, and differ significantly.

However, later NISSAN moved to a more convenient method and principles of self-diagnosis on more modern car models.

Diagnostic connector

Location of the diagnostic connector.
This diagnostic connector is located at the bottom right of the steering column and to read the fault codes, do the following: Turn on the ignition; Briefly bridge the required “8” and “9” contacts for at least 2 seconds. Remove the jumper On the instrument panel, the “CHECK” light will begin to flash, indicating a fault code. Removing fault codes Removing fault codes is carried out as follows: · While reading fault codes, contacts “8” and “9” should be bridged again for at least 2 seconds;
·Remove the jumper; ·The “CHECK” light should “highlight” code “55” - “everything is fine.” Source

Nissan - diagnostics and self-diagnosis
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