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

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).

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.

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.

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

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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:

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.
Generator. The reason may be its power or the fact that the contact disappears. The problem often occurs on Priors, Kalinas and VAZ 2114

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.
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.
“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.
"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.
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.
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.

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.

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. 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.

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.

Error code P1602 indicates that the controller power supply voltage is lost.

Error P1602 stands for “Control system controller, loss of on-board power supply voltage.” In the understanding of this error, the controller means the electronic engine control unit (ECU), since the error begins with the letter “P”.

p, blockquote 1,0,0,0,0 —>

p, blockquote 2,0,0,0,0 —>

This error belongs to the class of system errors, since it does not specifically indicate a faulty device or unit. Therefore, eliminating error P1602 is carried out by monitoring possible locations of the malfunction.

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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.

What does error code P1602 mean?

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p, blockquote 6,0,0,0,0 —>

p, blockquote 7,0,0,0,0 —>

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.

p, blockquote 9,0,0,0,0 —>

p, blockquote 10,0,1,0,0 —>

p, blockquote 11,0,0,0,0 —>

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.

p, blockquote 13,0,0,0,0 —>

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.

Possible reasons

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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.

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.

Prevention of breakdowns of electrical appliances

To prevent breakdowns of electrical circuits, you must follow a number of simple rules.

Periodically check the contact connectors for oxidation or overheating. Rust disrupts the passage of impulses, which can be read by instruments as damage to the unit.
Once a year, treat contacts with special oils. Lubricants prevent moisture from entering metals, which prolongs their service life.
Replace dry wires in a timely manner. Cracked insulation can cause a short circuit.

Errors on the VAZ 2110 (2112) panel provide the user with complete information about the condition of the vehicle’s components and assemblies. If you know the decryptions, the driver can independently fix the breakdown of the vehicle electronics.

Check Engine

When the ignition is turned on, the indicator should light up, so the ECM checks the serviceability of the lamp and control circuit. After starting the engine, the indicator should go out if the controller memory does not contain the conditions for turning it on.

The Check Engine light is constantly on - in this case, the driver is obliged to make the vehicle available to service technicians as soon as possible.

A flashing Check Engine Light indicates a problem that can cause serious damage to the ECM (for example, a misfire can damage the catalytic converter).

To protect against random, short-term errors that may be caused by loss of contact in electrical connectors or unstable engine operation, the warning light turns on after a certain period of time after detecting a malfunction in the ECM. During this period, the on-board diagnostic system checks for a malfunction.

After eliminating the causes of the malfunction, the alarm will turn off after a certain delay time, during which the malfunction does not appear, and provided that there are no other fault codes in the controller’s memory that require turning on the alarm.

When clearing (deleting) fault codes from the controller’s memory using diagnostic equipment, the indicator goes off.