Error P1602: VAZ Priora, Kalina, Granta often display error code P1602

Error P1602 means “Control system controller, loss of on-board network voltage.” Understanding the cause of this error is not easy. Error codes in vehicles appear because there is some kind of mechanical or electrical problem that needs attention. The codes trigger error indicators, such as the check engine light, to light up on the dashboard and alert the driver to the problem so they can fix it. However, the error lights on many vehicles do not turn off automatically after the initial problem is resolved. Many vehicles require rebooting the car's computer or manually clearing codes.

What is error p1602

When this malfunction occurs, electrical voltage stops flowing to the motor control unit. There may be two options:

There is no voltage in the system at all.
Partial lack of power.

Typically, voltage is transmitted to the controller via several buses:

30 bus – constant voltage, parallel to the positive terminal of the battery;
15 bus - voltage passes through the ignition relay;
50 – voltage passes when the engine starts.

In addition, the motor control controller voltage can pass through the ECU contacts.

First of all, you should understand that if the error code is P1602, then there is no voltage in an emergency or this is a deliberate action of the system. Just as I wrote above, there may be no voltage only in certain areas and, as a result, there is no power to the ECU.

When wires break;
If the generator fails;
Relay problems;
In case of battery failure;
If you intentionally reboot the system;
Other.

Dmitry Timofeev

Has been repairing cars for over 10 years. You can ask him a question.

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In 90% of cases, error P1602 is harmless and practically does not affect the operation of the car. In most cases, even the Check indicator light does not light up.

This error can appear even if you simply removed the negative terminal of the battery.

This does not mean that you should not react to it in any way. An error may make it difficult to start the car. You will especially notice this during the cold season.

Therefore, it is important to find the cause of the error as quickly as possible. Such minor damage can lead to wear and tear of more expensive components.

Chevrolet Niva error 1602

On this machine, it’s 3 years old, my friend started to periodically get error 1602 and the check light comes on, the on-board computer says “loss of on-board voltage.” After resetting the error, it comes out again after a while. Has anyone encountered this? Please advise .

Last edited by smihuil; 10/22/2014 at 6:44 pm.

It seems that the entire error is written as a loss of voltage on the controller's on-board network. Do you know where the settings are on the ECU? Does the car stall?

The car doesn’t stall and he doesn’t know where he is; the check light is currently on again.

If the car doesn’t stall or affect the operation of the engine in any way, then let it drive and not interfere. If it interferes, cover the light bulb with electrical tape.

But still, the error is connected with something.

There could be too many things. Perhaps there is a bad contact in some plug, maybe a software glitch, maybe a bad solder in the ECU, maybe some kind of relay is not working. Only a diagnostician and an electrician can find where. But even then it will be very confusing. Keep an eye on the topic, maybe the experts can tell you something else.

Thank you for your participation in my question.

Yes, connected, bad ground on one of the ground on the ECU, reduced emergency power, maybe even a floating contact.

You need to hook up the scanner, output the ADC of the sensors and the ECU power supply itself, it’s better in the graph mode and accelerate and ride, depending on what changes and where and when the error appears, if the error appears at speed or on the mountain, that is, when there is an obvious increased load, the scanner still shows It wouldn’t hurt to display the engine load parameter as a percentage, so if an error occurs at increased load, then this is a contact and then the entire supply circuit rings, the main relay changes immediately.

Last edited by Creptolizer; 10/23/2014 at 11:16 am.

Yes, maybe the voltage on board the network is low. What is the voltage on the battery when the engine is off/on? With/without load? First of all, check this. Then stretch out all the masses.

Thank you for your assistance, I will pass on all your advice and comments.

Yes, a faulty generator can also generate an error if there is a voltage failure in one arm of the bridge.

Well, everything is simple here, I unplugged the + wire from the gene and drove it for a ride, then with the gene, I looked at when there was an error and when there was not.

Thank you for everything, if I find a reason, I’ll write what it was.

Did the author figure out the cause of the error? I started getting the same error after replacing the battery with a new one. Maybe the new one was not very new?

Does it appear constantly? Those. I reset it, but the next time I start it it pops up again?

Are the terminals properly tightened? Are the masses okay? It may pop up, for example, if the voltage drops below a certain value when cranking the starter. But at the same time this will not be noticeable - the starter will turn very sluggishly.

Yes, connected, bad ground on one of the ground on the ECU, reduced emergency power, maybe even a floating contact.

and if an error appears if you go forward. The tachometer is at zero, the engine does not stall. The tachometer needle may just jerk

Last edited by aleks67; 07/16/2015 at 13:48 .

P1602 Controller power supply voltage loss

Error P1602 on the on-board computers of VAZ 2114, 2110, Kalina vehicles means “Interruption of on-board network voltage.” Specifically, the on-board computer recorded a temporary, short-term lack of voltage. The problem can lead to battery drain, voltage drop and other problems. One of the most unpleasant problems is that the car will not start at all. Let's figure out the reasons for this error.

Most often, the error is associated with poor contact of the wires to ground, from the generator or on the battery terminals. In simple terms: there is contact, but there is no contact. Therefore, to correct error 1602 on domestic cars Niva, Priora, Grant, etc. contacts need to be cleaned.

The main contact from the generator, which should be thoroughly cleaned. It is located below all other contacts and most often loses contact.

The wire is to ground, look for it from the negative mark. The wire will go to the housing.

Check the contacts on the battery terminals and, if necessary, clean them of oxides.

If you solved the problem in another way, share it with us in the comments.

Code P1602 is entered if the following conditions are met:

Ignition is on; the controller has detected a loss of RAM data. Clear the codes using the Errors menu.

If the code is entered again, check the power supply circuit from the battery to contact “18” of the controller.

How to reset an error - check on Largus

After repairing the car, you can reset the codes yourself and without a scanner. To do this, you will need to completely disconnect the power from the on-board network, wait 15 minutes and return everything to its place.

The reset will be performed and the system will reset to normal.

Largus standard fault codes can be read independently. This will require a diagnostic scanner and primary knowledge of the operating principle of the device.

Specialization : Graduated from the State Automobile University, worked for 20 years at GAZ-56, now I drive a Zhiguli.

Source

Where is the p1602 sensor located?

The image above shows the ECU connector of an Audi Q7, terminal 30 is circled.

It should be noted that this code does not refer to the voltage at terminal #30 as shown here, but to the various and multiple terminals in the connector that should have a certain voltage across them when the ignition is turned off. Therefore, the presence or absence of power at terminal No. 30 (as shown here) when the ignition is turned OFF should NOT be taken as evidence of failure or malfunction unless the manual for the vehicle in question explicitly states that the specified voltage should or should not (depending on depending on the circumstances) be present at this terminal when the ignition is turned off.

ABS fault detection

You can find out about problems with the ABS by looking at the indicator light on the instrument panel. If it lights up for no reason or does not go out after the required period of time, you need to go to a service station and undergo computer diagnostics. Modern Priora ECUs have a diagnostic connector through which you can easily connect a portable scanner or a stationary motor tester.

All ABS electronics are connected to the mechanical part of the car, so only an experienced diagnostic technician can accurately determine the error that the system produces. ABS error codes start with 0035 and end with 0800. In order to deal with them correctly and determine the reason for the light bulb to light up, you need to have a table of error decoding on hand or resort to qualified help.

Other automaker definitions for p1602

Engine Control Module (ECM) Anti-lock Braking System (ABS) / Traction Control System (TCS), CAN Data Bus - Communication Failure (GM).
Battery Voltage Monitor - Malfunction (Toyota).
Engine Control Module (ECM) - Low Battery Voltage (Volkswagen).
Engine control module (ECM) - low battery voltage (Audi).
CAN Data Bus - Anti-lock Braking System (ABS) / Traction Control System (TCS) (Buick).
CAN Data Bus - Anti-lock Braking System (ABS) / Traction Control System (TCS) (Cadillac).
CAN Data Bus - Anti-lock Brake System (ASS) / Traction Control System (TCS) (Chevrolet).
Engine Control Module (ECM) Unprogrammed (Chrysler).
Engine Control Module (ECM) Unprogrammed (Dodge).
Transmission Control Module (TCM) - Serial Communication Problem (Hyundai).
ECM communication with ABS - circuit malfunction (Isuzu).
Engine Control Module (ECM) Unprogrammed (Jeep).
Transmission Control Module (TCM) - Communication Lost (Kia).
Battery voltage monitoring - malfunction (Lexus).
Immobilizer control module/engine control module (ECM) - communication error (Mazda).
ECM for LSI system - communication failure (Mitsubishi).
CAN Data Bus - Anti-lock Brake System (ABS)/Traction Control System (TCS) (Oldsmobile).
Engine Control Module (ECM) Unprogrammed (Plymouth).
CAN data bus. Engine Control Module (ECM) Anti-Lock Braking System (ABS)/Traction Control System (TCS) - Signal Malfunction (Pontiac).
Engine control module (ECM) - faulty (Saab).
CAN Data Bus, Anti-Lock Brake System (ASS), Traction Control System (TCS) to Engine Control Module (ECM) - Lost Communication (Saturn).
Engine Control Module (ECM) - Programming Error (Subaru).
Electronic Throttle System (ETS), Throttle Return Spring - Malfunction (Volvo).

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The intellectual capabilities of such a computer

Even though the on-board computer for the Lada Priora does not have any special brains, the device can significantly make life easier for the car owner. Each manufacturer has its own characteristics and features, so anyone can choose an assistant to suit their taste. Various displays, functions, controls, designs. What benefits can this device provide?

Monitoring and controlling vehicle sensors.
Quite long battery life.
Displays the quality of fuel entering the gas tank.
Monitoring the temperature of antifreeze and the ability to control the cooling system.
Engine speed sensors.
When the gas system is installed, the computer can switch the “gas/gasoline” mode.
Many different diagnostic protocols.
Control of parking radars and headlight modes.
Built-in tachometer, external and engine temperature sensor, econometer and other amenities.

All this can be viewed and controlled using the screen that every good car computer should have. If any system does not work or does not work correctly, an error message will appear on the screen. Agree, it’s nice when the seemingly wordless Lada Priora directly tells you what exactly is wrong. This time we are interested in error 1602.

Video about fixing the error

Error 1602 is usually harmless. The driver often doesn’t even know about it and only finds out by reading information from the controller (this is if there is no on-board computer with a monitor). Therefore, we can say that in most cases it does not affect the operation of the car and is associated with the fact that somewhere there is a slightly weak contact.

I won't fix it, that's how it works

6.9%

Voted: 58

Good luck to everyone, if you have any questions, ask in the comments.

Elimination methods

Methods for eliminating error p1602 directly depend on the reason why it was formed in the memory of the electronic control unit. However, before performing the steps listed below, it makes sense to programmatically reset the error. If there are no visible breakdowns, then it is quite possible that the error “Court Controller, loss of supply voltage” was generated accidentally.

We list possible solutions to the problem in the same sequence as the reasons that caused them:

Battery. Use a normally charged battery that holds a charge well and also has the appropriate capacity suitable for a particular vehicle (this is especially true for winter, when difficult engine starts are expected). Periodically check the charge level, electrolyte density, the quality of the terminal contacts on the battery, and if necessary, clean and lubricate them. Clean the contacts on the wires in the same way. If possible, you can check the battery leakage current. Sometimes an action that helps get rid of the error is to remove the negative wire from the battery for about 5 minutes (a few seconds is not enough), and then quickly put it on and set it in such a way as to ensure tight contact between the wire and the battery terminal. It is also advisable to first clean and lubricate the contact.
Generator. It makes sense to double-check the operation of the diode bridge, check the voltage at the terminals (on most modern passenger cars the corresponding value should be about 13.7...14.0 V). Check the ground of the generator and, if necessary, inspect the wire and corresponding contacts. Similarly, clean all accessible contacts on the generator, as well as tighten them. You can also re-stripe the wires and make new contacts to improve their quality. Clean the base of the generator mount and the engine block at the point of contact. In some cases, tightening the alternator belt helps (especially if it slips and whistles); if the belt is significantly worn, it is better to replace it with a new one. In rare cases, the generator is completely replaced.
Signaling. Regarding the alarm system, it is advisable to consult with the employees who installed the alarm system on the car, or find documentation for it on the Internet and find out whether it disconnects the battery from the system as protection or not. If yes, then you will have to come to terms with this error, or, as a last resort, change the alarm system to another one without a similar function.
Short-term voltage drop. Usually in this case, this error is simply reset programmatically from the ECU memory. It should not be restored in the future.
"Mass" of the ECU. Check the quality of the ground; if it is damaged, restore the integrity of the contact and/or wire. The chip may be damaged.
Ground connection between the body and the engine. Inspect the wires and contact connections; the tips (if any) may be damaged. If necessary, test the wire with a multimeter to check for continuity or damage to the insulation. If the wire is broken or damaged, it must be replaced with a new one. In this case, it is advisable to use tips.

Fuse box. Check the contacts in the block. Moreover, both coming from the battery and internal ones, directly on the fuses themselves. If necessary, tighten the contacts, remove oxides, and lubricate. It is especially necessary to check the fuse that goes to the electronic control unit, as well as its seat, the quality and cleanliness of the contact, and if necessary, inspect and clean it. It is also advisable to check the condition of the contacts in a special block under the hood. To do this, it is better to use a special contact cleaner.
Electronic control unit. If there is such a possibility, it is advisable to install an ECU of the same model with the same firmware version on the car. At the same time, check whether voltage is coming to the supply terminal of the control unit and what its value is. However, it is best to seek help from official dealers or a car service that repairs electronic “brains,” since reflashing or changing settings yourself can be fraught with big problems.

As practice shows, error 1602 itself is in most cases harmless, and the car owner finds out about it only when he uses a scanner to remove information from the ECU along with other errors or there is an on-board computer with a screen on which the relevant information is displayed.

Error P1602 is diagnosed on cars when one of the on-board voltages is not supplied to the engine control unit (ECU). Various options are possible: both permanent absence and short-term outages (one-time or periodic).

As a rule, the control unit receives voltage via several buses:

30 bus – on-board network voltage, which operates constantly, parallel to the positive terminal of the battery;
15 bus – on-board network voltage through the ignition switch (relay);
50 bus – on-board network voltage supplied when the “engine START” key is turned on.

In this case, the engine control unit can receive direct power from various contacts of the ECU connector. Thus, monitoring the voltages supplied to the engine control unit is difficult in the absence of a circuit diagram.

The most characteristic symptoms:

the ignition does not turn on;
the ignition turns on, the starter does not start;
the ignition turns on, the starter operates when the engine starts, the engine does not start;
the ignition turns on, the engine starts, does not respond to the accelerator pedal or other controls;
the ignition is turned on, the engine starts, there is color music on the dashboard (indicator lights blink, dial gauges deviate chaotically);
The car is operating normally, the error is diagnosed.

Error P1602 does not necessarily indicate a complete lack of voltage at one of the power inputs. The battery may have been discharged to a critical level or was temporarily disconnected from the terminals. After connecting the battery, error P1602 remains in the memory of the control unit, and it is enough to delete it (erase from memory) for the engine ECU to exit the emergency mode.

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Kalina Code 1602

#1 Zulus

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25 messages
City: Kovrov
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Post edited by Zulus: 07 December 2010 – 21:56

#2 napoxoq

alchemist sledgehammer and some mother

Blocked9606 messages

City: Krasnodar Region
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Is there a signal? What is blocking?

What is code 1602? I don’t even remember this, and the ardio didn’t tell me. Are you sure you didn’t mix up any numbers? Or the marshrutnik is a storyteller, he identified the wrong block. Immo, when you disconnected the jumper, did you set it, or did you block it, saying it won’t register on its own?

#3 Sasha

Administrator22337 posts

City: Ch.Gat
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Before ordering modified software, carefully read the RULES

Attention! I don't work with car owners! I do not work with “reader-uploaders” of firmware!

For work issues, available from 8.00 to 17.00 Moscow time . Requests received after this time will be reviewed the next day. Attention! Ordering the missing modified software in the APC Client database is available from your personal account on the store website.

#4 Zulus

Users25 posts

City: Kovrov
Gender: Man

P1602 “Loss of on-board power supply voltage in the controller.” There are several reasons in your case. 1. When trying to start on a dead battery, when the voltage drops below 6V. 2. Non-contact in power wires, ignition switch, frozen and incorrectly installed alarm system, etc.

#5 napoxoq

alchemist sledgehammer and some mother

Blocked9606 messages

City: Krasnodar Region
Gender: Man

Yeah! This is the one that swears when, with the ignition on and the GR control signal is applied, there is no or little voltage at the voltage input from the GR. Change the gearbox, I had a Priora like this last year! I check - everything is there. And “sometimes” it stalls and complains about a power failure. I couldn’t call, everything was fine and no complaints, I changed the relay at random. It's been a year already.

A little about codes

A big problem with VAZ products is imperfect self-diagnosis. Very often, even fairly simple faults related to the battery or generator are presented as a serious breakdown of the power plant. For this reason, you should not rush to a car service for repairs. Initially, you need to try to identify the malfunction yourself and, if it is not particularly serious, fix it on the spot.

It is known that in most cases the codes are related to the readings of sensors installed on the car, which are essentially the eyes and ears of the on-board computer. Therefore, first of all, you should make sure that the control devices are working properly.

The problem, however, is greatly aggravated by the following - quite often the codes issued have nothing to do with the breakdown that occurred. In particular, this happens too often in cars manufactured by VAZ.

However, according to professionals, this happens largely due to the installation by car owners of components produced unofficially. However, the sensors themselves remain fairly simple devices, from which you should not expect high accuracy in any case.

Meanwhile, not everyone can afford to use spare parts produced exclusively by official suppliers. Many note that in most cases their prices are clearly inflated.

The following reasons may cause the ECU to issue a particular error code:

failure of one of the sensors while maintaining the functionality of the node it controls;
low-quality fuel, poorly flammable - this leads to improper operation of the power plant;
clogging of both air and fuel filters;
incorrect flashing of the controller with homemade software;
a failure occurred in the ECU itself (as practice shows, this problem occurs most often);
transferring the car to gas, without replacing the on-board computer program.

Operating principles of the VAZ 2114 on-board computer

The electronic control unit of the VAZ 2114, as on other cars, is primarily designed to monitor the condition of various components and assemblies, as well as for subsequent indication of breakdowns if they occur. The introduction of the concept of self-diagnosis is a sound decision designed to facilitate both the operation of the car for the driver and possible repairs for the car service center.

The system works simply: if a unit breaks down or there is no signal from it, the ECU displays a coded message on a small display, which can be deciphered using the appropriate car manual.

Alas, as often happens with the domestic auto industry, the electronic brains of the ECU may begin to fail for one reason or another, giving the VAZ 2114 error 1602 in situations where there is no real breakdown. At the same time, the problem cannot be ignored under any circumstances, because once out of ten the control unit can signal that there are actually problems in the system.

Instead of immediately going to a service center and paying money for diagnostics, experts recommend trying to find out the cause of error 1602 on your own - it is quite possible that even an inexperienced car owner will be able to solve the problem.

It is important to remember that first of all, you should exclude the possibility of an error in the operation of the ECU itself and sensors if any error is detected on the screen. It will be useful to buy only original electronics parts in advance when operating a car, and not install cheap analogues (the same is true for unlicensed firmware).

As for the general list of reasons that can alert the ECU with a problem message, the most common factors are:

Changing the type of fuel system without flashing the controller.
Low quality fuel, which has a complex effect on the entire energy system.
Clogged air or fuel filter.
Inept attempts to reconfigure the “brains” of the controller.
System failure of the ECU or failure of one of the sensors.

Do not forget that any intervention in the factory settings of the computer or replacement of sensors (as well as cables and connectors) with unofficial ones, not produced by AvtoVAZ, is fraught with frequent errors in the operation of the ECU - as a result, this means lost nerves and money in the future.

Updated Lada Largus: modified engine and prices

AVTOVAZ has opened orders for updated Lada Largus vans and station wagons: for now they can only be placed online, but dealers will soon be connected. When ordering on the website, the car is reserved for free for three days, and if you make an advance payment of ten thousand rubles - for an indefinite period. The cars have been in production since the beginning of February, so they are expected in showrooms soon.

Largus has been transformed: the front part of the body is completely new - with a signature X-face. There were different headlights (almost the same as the current Renault Logan/Sandero models) with separate running lights, a radiator grille, a hood and front fenders. Other rear-view mirrors (with built-in turn signals) and a shortened roof antenna also appeared. The new interior is unified with that of the first generation Renault Duster crossover. The updated Largus has the same front panel, console and door trim, but its steering wheel (from the XRAY Cross hatchback), and the design of the instruments is made in the style of other Lada models.

Sound insulation has been improved, and options include a media system with a seven-inch screen (previously Largus was content with simple push-button “music”), a rear view camera, heated windshield and second-row seats, cruise control, light and rain sensors. The steering wheel now has heating and buttons. The power window control keys moved from the center console to the doors, and the seat heating buttons moved from the base of the seats themselves to the console (this solution was tested last year on a special version of the Largus Cross Quest). Finally, new front seats with improved lateral support have appeared, and a right driver's armrest has been added. Alas, the presence of side airbags was not confirmed, and the Largus still does not have a stabilization system.

But the basic eight-valve 1.6 engine has been modified. It has a modernized connecting rod-piston group and crankshaft, as well as a modified gas distribution mechanism. Power has increased from 87 to 90 hp, and 80% of the maximum torque is available at 1000 rpm. Another achievement is that the need to adjust the valves before the vehicle reaches 90 thousand kilometers is eliminated. Sixteen-valve 1.6 with 106 hp. former.

Of course, after restyling, Largus became more expensive. The basic van has added 30 thousand rubles and now costs at least 686 thousand. The station wagon has become 22 thousand more expensive: now they are asking for at least 691 thousand rubles. At the same time, there was a formal rearrangement in the trim levels: the simplest Standard (with black bumpers) was excluded from the range, the Classic version became the basic one, but in terms of equipment it now almost repeats the previous “standard” version. There is one airbag, ABS, audio preparation, on-board computer and central locking with remote control, and on the second row there are only two headrests.

The price of the seven-seater Largus has increased significantly: if the pre-restyling station wagon with a third row cost from 748 thousand rubles, then for the updated one you need to pay at least 818 thousand rubles. But the set of equipment for the “elevated” version of Largus Cross has been expanded. Previously, only two fixed versions were offered, but now different option packages can be selected for the two options. True, if earlier they asked for a minimum of 829 thousand for Cross, now - from 866 thousand rubles.

The richest Lada Largus Cross in the Luxe Prestige configuration has two airbags, a third row of seats, fog lights, a heated steering wheel, windshield and seats in the first and second rows, air conditioning, a rear view camera, rear parking sensors, cruise control and 16-inch alloys. wheels. Price - 982 thousand rubles. Before restyling, the most expensive passenger Largus cost 898 thousand.

Cleaning the sensor and connector

Before you think about replacing the sensor, it is recommended that you clean and repair it first, as a dirty sensor will send incorrect data to the ECU. To do this, you should have the following tools ready:

Carburetor cleaner.
Clean cloth.
Screwdriver.
Gloves.

Step 1: Let the engine run for a while

Start the car and let the engine idle for a few minutes. This will heat up the engine and some of the dirt will loosen on its own.

Step 2: Open the hood and locate the sensor

Once the engine is warm, open the hood of the car and locate the throttle position sensor. You may have to remove the engine cover to do this.

Step 3: Disconnect the connector

Disconnect all wiring and connections leading to the TPS. Next, unscrew the nuts and bolts securing the sensor and carefully remove it.

Step 4: Clean the sensor and connector

Clean the sensor with cleaner. Clean around the sensor thoroughly until all dirt is removed.

Step 5: Drying the Sensor

After cleaning the sensor, use a dry cloth and rub gently to remove any remaining liquid. Then plug the sensor into place, close the hood, and you're done.

Device

The Lada Kalina generator consists of the following parts:

housing (front and back cover);
pulley;
stator windings;
armatures (rotor);
voltage regulator relay (charging relay);
diode bridge (rectifier unit);
two armature bearings;
rear plastic casing.

Inside the generator housing, along its walls there is a stator with a winding, and a rotor is located in the center.

At the back of the case there is a diode bridge and a voltage regulator relay; the diode bridge is covered with a plastic casing to prevent dirt and dust from entering.

There is a pulley in front of the housing; it is put on the rotor shaft and secured with a nut.

The generator is driven by a drive belt placed on a pulley.

Error p1602 - low voltage on the control unit (ECU)

Trouble code P1602 is a code that is defined by Volkswagen and Audi as "Engine Control Module (ECM) Battery Voltage Low."

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Set when the engine control unit (ECU) detects that the battery voltage supplied to the ECU when the ignition is turned off is below the minimum permissible threshold.

Any modern engine control unit is a complex computer that contains various voltage regulators/stabilizers, current converters, control circuits and several types of memory. All of these parts are involved in controlling, regulating and monitoring hundreds, if not thousands of functions in a modern car.

As you would expect from a complex computer, some functions such as OBD II fault memory, basic idle speed settings, basic ignition timing settings and several others are memory dependent. If the memory power is interrupted or the voltage is too low, these settings may be lost.

Thus, in practice, these circuits remain switched on even when the ignition is switched off. This ensures that the engine will start and run smoothly the next time it is started.

In some vehicles this set of features is known as KAM (Keep Alive Memory). KAM is similar to the BIOS system on a PC in that the BIOS system provides the PC with basic operating instructions when it boots up.

Likewise, the KAM memory provides the ECU with basic operating instructions that must be turned on and running until the control unit can use inputs and/or feedback loops from the sensors to keep the engine running.

From the above it should be obvious that if the KAM memory is lost due to insufficient or interrupted power supply, the basic operating instructions required to "boot" the ECU will not be available and as a result the engine may not start.

When the controller detects low voltage for the KAM, it sets code P1602 and may also turn on the Check Engine Light.

Error p0422

This failure is called "neutralizer efficiency below threshold." Eliminated as follows:

It is necessary to turn off the car ignition and connect the diagnostics. After that, turn on the ignition and look for other errors. First of all, they should be eliminated.
Check the catalyst manifold for damage. If there are any, then we replace it. If there is no damage, then move on to the next point.
We inspect the exhaust gas system in the area between the converter and the muffler. It must be sealed and not damaged. If the latter are present, eliminate them. If no complaints are found, then the converter itself is probably faulty and requires replacement.
After replacing or eliminating identified deficiencies, you need to warm up the engine to a temperature of 70 degrees and set the speed to around 2000-3000. In this mode, wait at least four minutes. The error should not appear within this period of time.

It should be noted that the efficiency of the neutralizer is checked with special gas analyzers.

Self-diagnosis

Once the main code errors have been studied, you can perform self-diagnosis of the car. The Lada Priora has a special controller that allows you to perform diagnostics. If an on-board computer is installed in the car interior, then diagnostics are performed with its help. In addition, there is special equipment that allows you to more accurately perform this procedure.

Diagnostics begins with activation of the test mode. The procedure is performed as follows:

Turn off the ignition and hold down the mileage reset button, then turn it on again without releasing the button.
When the ignition is turned on, all components located on the instrument panel will begin to glow. All devices will begin to move to the maximum mark, and then back. This behavior of the car indicates the beginning of the diagnosis.
Next, we move on to the right steering wheel switch, on which there is a button for switching the settings of the on-board computer. After clicking on it, an information message with the software version will appear on the screen.
After pressing the button again, error diagnostics will begin. Error codes will appear on the display, which can be deciphered using the corresponding table.
Once the diagnostics are complete, you can reset the error data. To do this, hold down the mileage reset button for five seconds.

Error p0504

This malfunction is associated with an incorrect signal from the brake pedal switches. Most often, the cause of such a malfunction is a malfunction of the brake pedal position sensor, lack of proper adjustment, or a broken spring installed in this device. Procedure for checking and troubleshooting:

We remove the sensor;
Move the rod lock to the right position using a screwdriver;
We use a multimeter with an ohmmeter function;
On Largus, Vesta and Xray cars, contacts 3-4 should be closed and have a resistance close to zero. Contacts 1-2 are open and their resistance should tend to infinity.
When you press the rod on contacts 3-4, the circuit opens, and on contacts 1-2 it closes. If this is not the case, then the sensor must be replaced.
On Priora, Kalina, Granta, Niva cars, contacts 1-4 should be closed, and 2-3 open. When you press the rod, the situation is the opposite.
Before reinstalling the sensor, move the rod to the left position.

Error p1602

This failure occurs due to a loss of supply voltage to the ECU.

Things to check:

Battery charge. A fully charged battery has a voltage of 12.8 Volts when the engine is off, and while the engine is running it averages 13.8 Volts.
Oxidation of terminals. If present, it must be cleaned.
Reliability of ground contacts or current leakage in the vehicle power circuit.
Status of the 18th power supply pin of the engine control controller.

Location of the 18th ground contact on the VAG block

Causes of error p1602

Low mains voltage caused by a faulty, damaged or discharged battery.
Low line/battery voltage caused by faulty components in the charging system, including the alternator.
Bad battery terminals.
The battery cables were disconnected without first installing a memory saver to provide power to the ECU circuits.
ECU/KAM power supply circuit open.
A faulty ignition switch that cuts off power to the ECU when the ignition is turned off.
Error in KAM (Keep Alive Memory) software.
ECU failure.

Interpretation of error p1602 - controller voltage interruption. reasons and how to fix

Error p1602 stands for “Control system controller, board voltage interruption.” In practice, this means that somewhere in the car’s electrical network a contact has disappeared, most likely a “minus” one. Most often, error p1602 occurs on domestic VAZ cars, starting from the tenth model (VAZ-2110)

and higher - on Kalina, Priora. The difficulty of diagnosis lies in the fact that the electronic scanner is not able to show in which particular area or specific device the on-board voltage has disappeared. Therefore, localizing the location of a breakdown sometimes takes a lot of time and effort.

Description of the error
Possible reasons
Elimination methods

VAZ cars: repair, maintenance, tuning

Errors in the engine control system on VAZ cars equipped with injection engines of the tenth family (and this is almost the entire model range, starting with the VAZ 2110, Kalina, Priora...) are not as rare as we would like. Among them there are error codes that require immediate elimination and identification of causes, and there are those that appear from time to time. Among them, one of the leaders was error P1602. What the error code means, what it means and how to fix it, we’ll figure it out together.

Symptoms

Error P1602 on the VAZ 2114 is notable for the fact that sometimes it can appear asymptomatically. The owner learns about it only from the readings of the on-board computer or when conducting diagnostics with a scanner. Therefore, it can be difficult to determine. Additionally, the occurrence of this code may be intermittent.

In some cases, when the ECU reports this code, problems with starting the engine may occur. It may start poorly, not the first time, or not start at all. But this is also not a characteristic feature of this problem. In a similar way, a machine can report many faults.

The error code does not match the problem - a common occurrence for VAZ

Considering the fact that the entire diagnostic system is built on fairly simple sensors, you should not expect accuracy from this option for testing cars. VAZ on-board computers often produce inadequate data that interferes with the operation of the car. This is especially often due to the use of analog components or other unofficial materials.

Maintaining and repairing your car today can be a real hassle if you only use official parts. They are sold at obviously inflated prices; not every driver is willing to pay a lot of money for factory parts. The reasons for strange error codes or information about known working nodes may be the following:

failure only of the sensors of a certain vehicle component, and not the units themselves;
bad fuel, which creates a lack of ignition and other engine problems reflected in VAZ error codes;
clogged air and fuel filters, which can cause the most unexpected codes;
independent firmware of the on-board computer with unauthorized software, which leads to changes in the subtleties of the power unit;
Installing inappropriate parts may cause error codes to be constantly illuminated;
a malfunction of the vehicle’s on-board computer system is the most common problem with issuing unexpected codes;
installation of gas equipment and the lack of the necessary firmware for the computer will make operating the car completely impossible.

Let's remove these annoying numbers from the screen

Without exaggeration, the constant appearance of error P1602 on your VAZ-2114 car can be thoroughly annoying. Sometimes it seems that the car is mocking you, but do not forget that the car does not have its own decision-making center, and this is all on-board computer.

Maybe he really has a wicked sense of humor. The simplest way to diagnose its performance is to simply replace one device with a similar one that is known to be working. The only problem may be getting another computer, but you don’t need it forever, you can just borrow it from a friend, simultaneously enlisting his services as an assistant, since he is so generous: what if the breakdown is in the machine, and not in the electronic brains , then extra hands will come in handy.