Interpretation of error p1602 - controller voltage interruption

What does the error code mean?

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. Depending on which power supply is missing, the vehicle may behave differently with the same P1602 error.

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.

Decoding P1602

• Low voltage supply to the engine control unit (AUDI, ISUZU, SAAB, VOLKSWAGEN).
• Knock Sensor Module Performance (BUICK, CADILLAC, CHEVROLET, GMC).
• Speed ​​Control Solenoid (DODGE) Circuit.
• Problem with the wiring of the engine control unit (HYUNDAI, KIA).
• Engine control unit immobilizer error (MAZDA).

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.

Operating principles of the 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).

This is interesting: Replacing the ignition switch and its contact group

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

1. Changing the type of fuel system without flashing the controller.
2. Low quality fuel, which has a complex effect on the entire energy system.
3. Clogged air or fuel filter.
4. Inept attempts to reconfigure the “brains” of the controller.
5. 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.

What does code P1602 mean?

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

Possible reasons

When diagnosing error P1602, the engine control unit is insufficiently powered from the on-board network. What could be the reasons:

• temporary disconnection of the battery terminals (terminals) from the on-board network for the period of repair or maintenance;
• critically low battery charge;
• voltage dips in the on-board network during engine startup with low residual battery capacity (for example, during engine startup at extremely low ambient temperatures);
• fuse blown in the power supply circuit;
• fraying of contacts or malfunction of relays servicing the engine control unit;
• contact failure of the control unit connector;
• abnormal operation of car alarms;
• error on the CAN bus (communication bus between control systems);
• problems with the generator;
• violation of the common wire (ground) of the car;
• control unit malfunction;
• previous polarity reversal when installing the battery.

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

Error 1602 on VAZ cars: what is the reason

If you look through the VAZ manuals that came with the car, you will find information in them that this malfunction can only occur under the following conditions:

• With the ignition off;
• If the controller notices that some data has been lost.

This problem occurs on almost all relatively new VAZ models, for example:

• Priora;
• Grant;
• VAZ 2110;
• VAZ 2112;
• VAZ 2114;
• Kalina;
• Niva Chevrolet;

It’s difficult for me to immediately see all the reasons for error P1602. I will try to talk about the main ones. I will describe the problem using the example of individual units in which an error can most often occur:

1. Battery. It may be discharged or you have poor terminal contact. I once had a problem due to a large number of electrical appliances (I connected an electric winch and plugged in a few more lamps). The system couldn't cope. Also, P1602 may appear if you change the battery or when starting the engine on a discharged battery.
2. Generator. The reason may be its power or the fact that the contact disappears. The problem often occurs on Priors, Kalinas and VAZ 2114

1. Signaling. There are modern car protection systems that turn off the battery when the alarm is turned on. It is assumed that if thieves get into the cabin, they will not start the engine. However, the system may generate this exact error.
2. Minor power loss. For example, you start your car in cold weather. A large flow of energy went from the battery to the starter. The controller was left without power for a short time. As a result, the system issued P1602.
3. “Mass” of the controller. The reason is quite common. Your car contact is simply oxidized, and the system thinks that it has been left without power and generates an error.
4. "Mass" between the body and the engine. This happens if your engine is damaged (for example, after an accident), contacts are oxidized, or wire insulation is damaged.
5. Safety block. The wires in them can also periodically oxidize. As a result, the voltage may also drop. Although the block itself is also worth checking, the reason may be in itself.
6. Control electrical unit. The error may also appear due to hardware problems. Then I recommend that you contact the service; if you don’t understand it, then it’s better not to get into the firmware yourself.

This is interesting: What happens if you pour oil into the engine?

What is error P1602

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

1. There is no voltage in the system at all.
2. 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. The problem can arise from almost any electrical mechanism, for example:

• 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.

Ask a Question

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.

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 are 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 terminal battery 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.

This is interesting: What to do if the smell of gasoline appears in the car interior

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. Therefore, if it does not affect the behavior of the machine (and in most cases this is the case), then the machine can be used and “bothered” about it. As for elimination, the cause is usually poor ground or battery contact.

[Closed] Solved: The key will not start, the starter will not turn. Error P1602

Topic: Resolved: Key won't start, starter won't turn. Error P1602

Hello. I encountered the following problem. The car (VAZ-21104, 1.6 l. 16 cl. engine 21124, ECU January 7.2) does not start with the key, the starter does not turn. I started it for a couple of days by bridging the contacts on the retractor. In this case, error p1602 hangs, loss of power to the controller. I thought the heels on the retractor were sticking, I took it apart, polished the heels, reassembled, the result was zero. I reset the controller, no effect. What else could it be? Ignition switch contact group? Signaling?

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

2 Reply from Sergey VAZ 2111 2016-05-14 20:58:18 (2016-05-15 00:05:13 edited by Sergey VAZ 2111)

Re: Resolved: The key won't start, the starter won't turn. Error P1602

Egnition lock. Or the ignition switch relay. And error p1602 pops up when I disconnect the battery. So, either check the contacts on the battery and ecu.

Thanks said: Admin 1

3 Reply from “Robotron” 2016-05-14 21:23:04

Re: Resolved: The key won't start, the starter won't turn. Error P1602

amakasoff - try to start the car without keys (you will need to pull out the entire headlight switch). If it starts without keys, then the lock needs to be replaced. lada2111.rf/forum/viewtopic.php?id=2023

4 Reply from sergo9531 2016-05-14 23:22:39 (2016-05-15 22:25:37 edited by sergo9531)

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Re: Resolved: The key won't start, the starter won't turn. Error P1602

amakasoff . There are additional relays in the mounting block on top. One of them is responsible for the operation of the starter (I think it’s the one on the right, I don’t remember). Try installing something else first (for example, from ESP). If it works, change the relay. otherwise, jumper contacts 30 and 87 of the relay. If it works, the problem is either in the lock, its wiring, or the ECU. If not, the problem is in the wiring to the starter ( the underlined is not correct! ) I looked at the diagram (www.drive2.ru/l/5468943/ for those interested), it turned out that this is not entirely true. Judging by it, this relay opens the starter lock circuit. Accordingly, the actions are slightly different: 1) we bug (we bridge) contacts 30 and 87 of the starter relay and start the car - the starter works - the problem is in the control of the relay (broken wires or ECU). we remove the “bug”. If not, then: 2) turn on the ignition, bridge contacts 30 and 50 of the ignition switch. If the starter works, the problem is in the lock. We remove the “bug”. 3) otherwise, we look for a break in the wires or poor contact.

ps criticism is welcome)

5 Reply from Sergey VAZ 2111 2016-05-15 00:03:45

Re: Resolved: The key won't start, the starter won't turn. Error P1602

amakasoff . There are additional relays in the mounting block on top. One of them is responsible for the operation of the starter (I think it’s the one on the right, I don’t remember). Try installing something else first (for example, from ESP). If it works, change the relay. otherwise, jumper contacts 30 and 87 of the relay. If it works, the problem is either in the lock, its wiring, or the ECU. If not, the problem is in the wiring to the starter.

The ECU is not responsible for the starter. it has nothing to do with this situation

6 Reply from amakasoff 2016-05-15 08:55:38

Re: Resolved: The key won't start, the starter won't turn. Error P1602

And if the ignition relay is faulty, the car will respond to the ignition key, i.e. will the devices come to life, but there will be no launch? Tell me am I right or wrong?

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

7 Reply from Patroclus 2016-05-15 09:00:33

• Patroclus
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• Car: Lada Priora 2171 Wagon. VESTA

Re: Resolved: The key won't start, the starter won't turn. Error P1602

Yes, the starter contacts are faulty

Added: 2016-05-15 09:00:33

indicate the direction - the elephants of the padishah will come themselves

8 Reply from amakasoff 2016-05-15 10:45:08

Re: Resolved: The key won't start, the starter won't turn. Error P1602

Yes, the starter contacts are faulty

Added: 2016-05-15 09:00:33

How is this treated? And can it be treated at all?))) Without completely replacing the ignition switch

Added: 2016-05-15 13:45:08

I just checked the ignition relay, everything is fine.

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

9 Reply from sergo9531 2016-05-15 17:45:36 (2016-05-15 17:46:51 edited by sergo9531)

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Re: Resolved: The key won't start, the starter won't turn. Error P1602

Sergey VAZ 2111 . And what do you think, on cars with this ECU, turns off the starter after 10 seconds of continuous operation or when the engine starts and the driver holds the key in the “starter” position?

10 Reply from amakasoff 2016-05-15 18:56:01

Re: Resolved: The key won't start, the starter won't turn. Error P1602

Another question has arisen. If the ignition switch is faulty, will the car be started from the remote control? I can't start either with the key or with the remote control.

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

11 Reply from Sergey VAZ 2111 2016-05-15 20:50:32

Re: Resolved: The key won't start, the starter won't turn. Error P1602

Sergey VAZ 2111 . And what do you think, on cars with this ECU, turns off the starter after 10 seconds of continuous operation or when the engine starts and the driver holds the key in the “starter” position?

The relay itself turns off the starter when the relay heats up.

12 Reply from sergo9531 2016-05-15 22:42:30

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Re: Resolved: The key won't start, the starter won't turn. Error P1602

Sergey VAZ 2111 . It’s just a miracle relay) but what else can it do? measure the engine speed to turn off the starter.” when the engine has started and the driver holds the key in the “starter” position.”

amakasoff . If the autostart did not work before, then this is a problem in the signaling. If the lock and autostart stop working at the same time, then different options are possible. Need to think

13 Reply from Sergey VAZ 2111 2016-05-16 04:32:54

Re: Resolved: The key won't start, the starter won't turn. Error P1602

Sergey VAZ 2111 . It’s just a miracle relay) but what else can it do? measure the engine speed to turn off the starter.” when the engine starts and the driver holds the key in the “starter” position” Find the electrical diagram for connecting the starter and ignition switch and you will see everything.

amakasoff . If the autostart did not work before, then this is a problem in the signaling. If the lock and autostart stop working at the same time, then different options are possible. Need to think

14 Reply from amakasoff 2016-05-16 09:47:55

Re: Resolved: The key won't start, the starter won't turn. Error P1602

The starter relay is the second on the right, as I understand it, I reset all the effect switches to zero and started it with a screwdriver. Turned it off after 5 seconds. I turned the key and the car started. I turned it off, a minute later again, it started again. I turned it off, started it with the remote control, and it started again. I'll try again in an hour.

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

15 Reply from amakasoff 2016-05-16 12:22:48

Re: Resolved: The key won't start, the starter won't turn. Error P1602

And again it wouldn’t start.

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

16 Reply from amakasoff 2016-05-16 18:23:06 (2016-05-16 18:23:38 edited by amakasoff)

Re: Resolved: The key won't start, the starter won't turn. Error P1602

It's decided! After googling and finding out that this is a disease of most of the 10th family of Pelvis, I installed an additional relay (I took the relay directly to 50a). Now it starts in half a click. Both from the key and from the remote control. Thanks to all.

VAZ-2110, 1.6 l. 16th grade engine 21124, ECU January 7.2

17 Reply from Admin 2016-05-17 07:14:16

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Re: Resolved: The key won't start, the starter won't turn. Error P1602

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).

Sources

• https://voditeliauto.ru/poleznaya-informaciya/to-i-remont/kod-oshibki-p1602.html
• https://elm3.ru/diagnostika/oshibka-p1602
• https://remontvazov.com/oshibka-1602-na-vaz-2114
• https://kody-oshibok.ru/avtomobili/vaz/oshibka-1602-na-avtomobilyakh-vaz.html
• https://etlib.ru/blog/1166-oshibka-r1602

[collapse]

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. If this error appears very often, you can try updating or changing the computer firmware. To do this, it is better to contact a specialist.

Niva Chevrolet error 2196

Common errors when switching from gasoline to gas in a Chevrolet Niva equipped with gas equipment: 0328 (knock sensor circuit, high signal level) and 2196 (oxygen sensor to the converter, over-enriched mixture).

The appearance of errors is due to the fact that when switching from gasoline to gas, the engine control unit uses the same firmware, which implies operation on the same type of fuel. Gasoline and gas form different fuel-air mixtures, which produce different parameters when burned. The engine control unit has the ability to automatically adapt to changed fuel parameters, but when switching to gas, its capabilities may be exceeded, as a result of which errors appear. It is recommended to use one type of fuel constantly or change the firmware of the control unit.

Every modern car owner knows about the existence of an on-board computer, which can not only indicate the basic parameters of the operating mode (speed, consumption, temperature), but also recognize errors caused by various malfunctions. Unfortunately, Chevrolet Niva error codes cannot be deciphered without additional tables, since there are too many of them. Let's consider various diagnostic methods.

We receive the first signal about the presence of a malfunction using the indicator on the “Check-Engene” panel.

After turning on the ignition, all systems are tested, and if no errors are detected, this indicator goes out. Otherwise it remains burning. Specialized centers will quickly identify the error and not for free, but the Chevrolet Niva has a built-in on-board computer that can allow you to deal with the problem yourself.

Self-diagnosis

Without going into details of the operation of all electronics, we note that the functioning of all vehicle systems is “monitored” by an electronic control unit (ECU).

It receives information from numerous sensors. Like any computer, the ECU requires software called firmware. This firmware is capable of analyzing indicators received from sensors, comparing them with normal parameters, identifying errors and storing these errors in memory.

Carrying out self-diagnosis

In the Chevrolet Niva, as in some other cars of the VAZ family, some parameters can be displayed on the VDO dashboard. It is often called an integrated on-board computer.

Testing is started by first pressing the daily mileage reset button and simultaneously turning the ignition key.

All instrument needles begin to move, which indicates the beginning of the testing process. Pressing the same button once will cause the firmware version to appear on the display, and pressing it again will give us a reading called an error code.

Panel codes should not be confused with ECU codes, which are diagnosed by external devices.

The operation of the on-board computer cannot be called flawless, since many errors arise as a result of software failure. You have to reset the errors by holding down the daily mileage reset button in testing mode. This diagnostic method is not entirely convenient for the reason that the error code can be the result of the sum of two codes at the same time (10=8+2).

Diagnostics with a scanner

The information in this section is quite extensive, since there are many types of scanners.

The basic principle of their operation is that all data, including errors, is transmitted from the ECU to a special diagnostic connector, which in a Chevrolet Niva is located on the driver's side under the steering wheel.

Error P0504

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

1. We remove the sensor;
2. Move the rod lock to the right position using a screwdriver;
3. We use a multimeter with an ohmmeter function;
4. 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.
5. 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.

6. 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.
7. Before reinstalling the sensor, move the rod to the left position.

Sensor locations on video:

Adjusting the brake pedal position sensor:

Any driver can carry out this procedure at home without a trip to a service station. The part has two nuts in its design. One of them is on top, and the second is on the bottom. The upper nut adjusts the pressure of the rod. First you need to release the lower one, and then tighten the upper one, thereby changing the gap of the element. You need to ensure that the rod is fully pressed and not partially pressed. After this, start the car and let it run for about 10 minutes to check if the error appears.

Interpretation of error p1602 - controller voltage interruption

Modern cars are equipped with quite effective on-board controllers, which are able to identify and indicate a particular problem that has arisen in the main systems and components.

In the event of a breakdown, a specific code consisting of letters and numbers is displayed on the computer screen, confirming the presence of an error. In earlier models of the Volzhsky Automobile Plant, in this situation, a light flashes, prompting you to check the engine and one of the few main codes is displayed, even if the breakdown is insignificant. Modern ECUs are already capable of informing the owner about the nature of the problem with maximum accuracy.

In this article we will talk about what kind of malfunction in the VAZ-2114 should be suspected if error 1602 appears.

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

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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.

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.