Chevrolet Niva won't start, immobilizer is on

01/24/2022 2,174 Electrical

Author: Victor

The reasons for the immo malfunction can be related to both the operation of the key fob and malfunctions in the unit’s software. If troubleshooting does not help, then you can disable the immobilizer on a Chevrolet Niva yourself in two ways: using a jumper or using a code.

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Tags: immobilizer

Comments 10

check the power supply for immo. Looks like you cut it off.

The new training key will only be sewn into the new immobilizer unit. That's how it was intended at the factory. Therefore, it’s good that there was a fuse.

Remove the immobilizer. It’s done quickly and nah... not needed. Even if it works now, it may fail later at the most inopportune moment, especially since it is located very low - in the area of the driver’s right heel.

If the immo is stitched, then unfortunately it’s not easy to remove

All immobilizers have the same operating principle. They exchange a code with their brains, which is embedded in the immobilizer. When replacing brains or immobilizer malfunctions, a training key is required. Well, etc. and so on.

The bottom line is that when the immobilizer is disconnected from the circuit, a jumper is placed in the connecting block, and some kind of fornication is soldered into the brains, which blocks the sending of the code request. After which the brains simply stop asking the immobilizer for the correct code, but as if they immediately receive it and allow all car systems to start. The immobilizer itself works, only in limited mode, but the brain remains normal.

Something like this. I haven’t heard about the firmware of the immobilizer itself, unless there are some new versions. I have old cars)))

No. if the firmware in the brain of the immo is reset to default, then everything. on the drum on the immo. on its presence and absence. in general, it’s as if they never existed))

I haven't heard this. I removed it myself according to the scheme described above. Simple and fast.

The keys are registered not in the immobilizer, but in the brain. To reset the keys: 1. new brains. 2. reset the corresponding chip (removal, opening of the brain and programmer). 3. Resolder this chip to a new empty one.

Go to the nearest chiptuners and let them flash your brains with immo calving.

I got a Chinese fuse F20. Looks intact, but doesn't work.

The reasons for the immo malfunction can be related to both the operation of the key fob and malfunctions in the unit’s software. If troubleshooting does not help, then you can disable the immobilizer on a Chevrolet Niva yourself in two ways: using a jumper or using a code.

Where is the immobilizer located on a Chevrolet Niva

Finding and solving immobilizer problems

Disabling the immobilizer in a Chevrolet Niva

What to do if you can’t disable the immobilizer and the car won’t start?

Video “Disabling immo in a Niva Chevrolet”

Comments and Reviews

Where is it located and what does it look like

The block itself is made in a rectangular metal case. If the immobilizer is installed standardly, then at the factory it is installed under the plastic tunnel of the center console in the area of the car owner’s right leg.

Blocker APS-6

APS-4

Chevrolet Nivas produced before 2004 were equipped with APS-4 immobilizers. Modern cars began to use APS-6 devices. In later versions of the car, it began to be installed on the steering column, and not in the tunnel.

Finding and solving immobilizer problems

Symptoms of problems with the immo system on a Chevrolet Niva are usually the following:

The Check Engine indicator or immobilizer icon lights up on the instrument panel.
The key installed in the lock does not allow starting the power unit of the car. The engine does not start and the crankshaft does not turn. Sometimes such problems can be regarded as a malfunction of the starter or battery.

The indicator on the dashboard can light up for various reasons, including if the light bulb itself is faulty.

Causes of malfunctions

The main causes of the problem:

Discharge of the power supply in the blocker control key fob.
Damage to the tag in the key. Because of this, the microprocessor control module cannot identify the car owner.
Mechanical malfunctions - damage to the key itself or the control unit of the system. Contacts may oxidize or defects may appear on them. If the control unit is exposed to moisture, it may become flooded.
Malfunction of the electrical component. This refers to the wires used to connect the blocker - they can be damaged.
Software malfunctions of the control unit.

User Alexander Zakharov showed one of the signs of a malfunction in the operation of the Niva engine blocking device.

How to fix?

The procedure for troubleshooting and repairing a device that allows you to block the internal combustion engine with your own hands is as follows:

The operation of the power source in the key is checked. If the battery is discharged, it must be replaced with a new one.
If replacing the power source does not help, you need to check the integrity of the tag in the key. If it is damaged, you cannot fix it yourself. You will have to make a duplicate key.
The immobilizer control unit is being diagnosed. Its integrity and contact elements are checked. If the latter are damaged or oxidized, they must be replaced or cleaned. In the case where the cause of the malfunction is the effect of moisture on the module, the only option to eliminate the problem may be to dry it. To do this, the module must be disassembled and the board itself must be placed in a warm and dry place.
Problems with wiring can be diagnosed visually or using a tester. The last option is preferable because it is accurate. If visual diagnostics do not produce results, you need to ring all conductors with a multimeter to determine the damaged one. Broken cables, as well as wires with worn insulation, must be replaced.
Software problems of the control module can only be resolved by flashing the device. It is very problematic to perform this task at home on your own; we recommend turning to specialists.

Doesn't start - carburetor.

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Doesn't start - carburetor.

Message » Sep 29, 2010, 11:56 am

Good day to all! Guys, help, sometimes the car won't start! Even the caburator servicemen can’t understand what’s going on. In general, this is what happens! As soon as it’s damp outside, for example, it was yesterday after the rain, or before that in the spring, when there was a thaw and everything was flowing. In general, the engine spins vigorously as usual, but it doesn’t even catch. doesn't grasp at all. What I tried: (at the moment when it wouldn’t start) I installed new spark plugs, it was no use, I wiped the distributor cover, looked at all the contacts for the presence of water on them (everything seemed dry), I completely cleaned the carb (Solex). and everything is just useless...it also twists and doesn’t grab. and then out of the blue it grabs and starts right away. By the way, there is always a spark on all four spark plugs. And the most interesting thing is that when it doesn’t start like that (I tried this once), then I immediately press it from the pusher literally from two meters. brbrbrbrbrbr..with half a turn So yesterday this crap happened again, but it started on its own after probably the tenth attempt. And in the spring I had a lot of trouble with this plant. In the summer there were no problems with the plant AT ALL. everything is as it should be! In winter, it also starts normally, but as soon as there is snot on the street, that’s it. what could be the problem?

Disabling the immobilizer in a Chevrolet Niva

Nuances of disabling methods:

To disable the immo in the first way, you need to prepare a jumper wire. After disconnecting the device, its presence will allow you to resume data exchange between the microprocessor module of the power unit and the diagnostic block.
Code deactivation of immo on a Niva Chevrolet is possible provided that the car owner knows the password.

Jumper

You can disable the immobilizer on a Chevrolet Niva yourself like this:

To turn off the blocker, you need to cut the wires and power them yourself. This method is quite complicated in terms of execution. If a diagnostic pad is needed in the future, it will be more difficult to renew it.
To clear the memory of the blocking device, it must be disconnected from the power supply. Then the jumper is installed in contact elements 9 and 18.
Then replace the factory chip with a special one. It must be flashed in advance and software installed to remove immo memory.
Insert the key into the lock and start the ignition for a few seconds. The immobilizer control unit should automatically clear the memory and reflash.

The Hephaestus channel talked about disabling the immobilizer in Niva Chevrolet cars.

Code shutdown

The procedure for deactivating immo is performed as follows:

A set of keys for the ignition switch is being prepared. It includes work and training elements. The first has a completely black head, while the second is equipped with a red insert.
All vehicle doors are closed. The training key is installed in the lock. The ignition is activated and switched off. The system status LED should blink rapidly.
When the diode blinks for six seconds, the training key is removed from the lock, the working element is installed in it and the ignition is activated. The beepper of the engine blocker control module should emit a triple beep.
With the ignition activated, you must wait until the beepper emits a double signal. Then the system is turned off.
The buzzer should then emit a triple beep. With the ignition activated, you must wait until another double signal sounds.
The ignition is turned off. While the training key is installed in the lock, you must wait for a single signal. The blocker status LED will blink rapidly.
The ignition is activated using the learning key. This must be done in time while the diode indicator is blinking. The Check Engine icon will light up on the car's dashboard. Then you need to wait one minute until this indicator goes off.
The next step is to enter a coded password, which includes numbers from 1 to 9. For each value, press the gas pedal all the way and hold it for three seconds, but no more. The number of presses corresponds to the password number; if entered correctly, the Check Engine indicator will light up.
If the light on the dashboard does not go off after five seconds, this indicates that the number was entered incorrectly. If the indicator blinks too quickly, this indicates an error when entering the code. It is necessary to turn off the ignition system and re-enter the password.
To exit the password entry mode, turn off the ignition.

Correct installation

The installation procedure is as follows:

Turn off the ignition in the car, open the hood and turn off the power to the on-board network. To do this, use a key to loosen the clamp on the battery terminal and disconnect it. All work is carried out with the on-board network turned off in order to prevent possible short circuits and voltage drops.
Then you need to provide access to the installation site of the blocker. Installing it in the tunnel next to the driver’s right foot is not the most reliable option. It is better to place the lock on the steering column. To do this, dismantle part of the cladding, unscrew all the screws that secure the plastic linings, and remove them. Make sure that there are no moving elements at the installation site; their impact could damage the blocker. Provide access for laying wires to the device installation site.
At the next stage, the main control unit is installed. Lock it in place. During movement, the module should not be exposed to vibration, otherwise the device will fail. Securely secure it with self-tapping screws. It is important that the immobilizer is disguised, this will prevent it from being disabled in the event of a break-in or illegal entry into the car. You can hide the device in the standard wiring harness.
All the wires that come with the kit are laid at the installation site. Depending on the immobilizer model, the number of cables differs. They can be used not only to block the power unit, but also to control other systems and components. If the device is not contactless, then you need to connect the wires to all mechanisms, from the ignition switch to the auxiliary systems. To do this, use the diagram that is included in the package.
At the next stage, the installation of blocking relays or sensors is carried out; here everything depends on the type of blocker.
A diode indicator is installed in the car interior. There are two installation options - hidden and open. Sometimes mounting a light bulb openly can deter potential thieves. But some car owners choose a hidden installation option, then the criminal will not know about the presence of IMMO and engine blocking may confuse him. The attacker will need time to find the blocker and disable it.
At the last stage, the procedure for programming and training the blocking device is carried out. The process is carried out in accordance with the indicators specified in the service manual.

If you have not encountered the process of connecting an immobilizer on a Niva Chevrolet, then it is better to entrust this procedure to specialists.

Auto electrician Sergei Zaitsev spoke about self-installation of the blocker.

Video “Disabling immo in a Niva Chevrolet”

The user Great Chiptuner spoke in detail about clearing the memory of the Bosch control unit and independently turning off the engine blocker.

The reasons for the immo malfunction can be related to both the operation of the key fob and malfunctions in the unit’s software. If troubleshooting does not help, then you can disable the immobilizer on a Chevrolet Niva yourself in two ways: using a jumper or using a code.

Where is the immobilizer located on a Chevrolet Niva

Finding and solving immobilizer problems

Disabling the immobilizer in a Chevrolet Niva

What to do if you can’t disable the immobilizer and the car won’t start?

Video “Disabling immo in a Niva Chevrolet”

Comments and Reviews

1.3. Immobilizer (anti-theft engine immobilizer system)

Reasons for disabling the immobilizer Immobilizer unit inside the instrument panel In order for the immobilizer circuit to fail on a Chevrolet Niva, you do not need to be a specialist, because this can even happen from incorrect connection of diagnostic equipment to the system. And this happens because the car’s ECU transmits all information via the K-line, diagnostic line - approx.

Emergency engine start with an activated immobilizer It turns out that the manufacturer is aware of the frequent breakdowns and malfunctions of the standard anti-theft system and has provided special software with the option of starting the engine in an emergency or unforeseen situation.

One of the most unpleasant situations that can happen to a vehicle owner is when the car does not want to start. To fix this, you first need to find out the cause of the machine breakdown. Unfortunately, even experienced motorists cannot always install it. We invite you to familiarize yourself with the main causes of the breakdown so that you can determine why the Chevrolet Niva does not start.

Finding and solving immobilizer problems

Symptoms of problems with the immo system on a Chevrolet Niva are usually the following:

The Check Engine indicator or immobilizer icon lights up on the instrument panel.
The key installed in the lock does not allow starting the power unit of the car. The engine does not start and the crankshaft does not turn. Sometimes such problems can be regarded as a malfunction of the starter or battery.

The indicator on the dashboard can light up for various reasons, including if the light bulb itself is faulty.

Read also: How many clips are there on a Priora door

Causes of malfunctions

The main causes of the problem:

Discharge of the power supply in the blocker control key fob.
Damage to the tag in the key. Because of this, the microprocessor control module cannot identify the car owner.
Mechanical malfunctions - damage to the key itself or the control unit of the system. Contacts may oxidize or defects may appear on them. If the control unit is exposed to moisture, it may become flooded.
Malfunction of the electrical component. This refers to the wires used to connect the blocker - they can be damaged.
Software malfunctions of the control unit.

User Alexander Zakharov showed one of the signs of a malfunction in the operation of the Niva engine blocking device.

How to fix?

The procedure for troubleshooting and repairing a device that allows you to block the internal combustion engine with your own hands is as follows:

The operation of the power source in the key is checked. If the battery is discharged, it must be replaced with a new one.
If replacing the power source does not help, you need to check the integrity of the tag in the key. If it is damaged, you cannot fix it yourself. You will have to make a duplicate key.
The immobilizer control unit is being diagnosed. Its integrity and contact elements are checked. If the latter are damaged or oxidized, they must be replaced or cleaned. In the case where the cause of the malfunction is the effect of moisture on the module, the only option to eliminate the problem may be to dry it. To do this, the module must be disassembled and the board itself must be placed in a warm and dry place.
Problems with wiring can be diagnosed visually or using a tester. The last option is preferable because it is accurate. If visual diagnostics do not produce results, you need to ring all conductors with a multimeter to determine the damaged one. Broken cables, as well as wires with worn insulation, must be replaced.
Software problems of the control module can only be resolved by flashing the device. It is very problematic to perform this task at home on your own; we recommend turning to specialists.

Disabling the immobilizer in a Chevrolet Niva

Nuances of disabling methods:

To disable the immo in the first way, you need to prepare a jumper wire. After disconnecting the device, its presence will allow you to resume data exchange between the microprocessor module of the power unit and the diagnostic block.
Code deactivation of immo on a Niva Chevrolet is possible provided that the car owner knows the password.

Jumper

You can disable the immobilizer on a Chevrolet Niva yourself like this:

To turn off the blocker, you need to cut the wires and power them yourself. This method is quite complicated in terms of execution. If a diagnostic pad is needed in the future, it will be more difficult to renew it.
To clear the memory of the blocking device, it must be disconnected from the power supply. Then the jumper is installed in contact elements 9 and 18.
Then replace the factory chip with a special one. It must be flashed in advance and software installed to remove immo memory.
Insert the key into the lock and start the ignition for a few seconds. The immobilizer control unit should automatically clear the memory and reflash.

The Hephaestus channel talked about disabling the immobilizer in Niva Chevrolet cars.

Code shutdown

The procedure for deactivating immo is performed as follows:

A set of keys for the ignition switch is being prepared. It includes work and training elements. The first has a completely black head, while the second is equipped with a red insert.
All vehicle doors are closed. The training key is installed in the lock. The ignition is activated and switched off. The system status LED should blink rapidly.
When the diode blinks for six seconds, the training key is removed from the lock, the working element is installed in it and the ignition is activated. The beepper of the engine blocker control module should emit a triple beep.
With the ignition activated, you must wait until the beepper emits a double signal. Then the system is turned off.
The buzzer should then emit a triple beep. With the ignition activated, you must wait until another double signal sounds.
The ignition is turned off. While the training key is installed in the lock, you must wait for a single signal. The blocker status LED will blink rapidly.
The ignition is activated using the learning key. This must be done in time while the diode indicator is blinking. The Check Engine icon will light up on the car's dashboard. Then you need to wait one minute until this indicator goes off.
The next step is to enter a coded password, which includes numbers from 1 to 9. For each value, press the gas pedal all the way and hold it for three seconds, but no more. The number of presses corresponds to the password number; if entered correctly, the Check Engine indicator will light up.
If the light on the dashboard does not go off after five seconds, this indicates that the number was entered incorrectly. If the indicator blinks too quickly, this indicates an error when entering the code. It is necessary to turn off the ignition system and re-enter the password.
To exit the password entry mode, turn off the ignition.

Equipment

In Niva Chevrolet cars, the immobilizer is structurally composed of the following elements:

main module, which allows you to turn the power unit locking on and off by sending a command to the control elements;
machine engine blocking relay;
diode indicator, which is located in the cabin; the installation location is chosen by the installer;
a key that is inserted into the ignition switch, with its help you can start and stop the engine;
a set of power cables for connecting the device to the on-board network;
user manual, which describes all the nuances of installing and using the blocker.

The IZO))) LENTA channel spoke about malfunctions of blockers in VAZ cars.

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Electrical faults

First of all, for all types and models of cars, you should pay attention to the battery - it can be worn out or simply discharged.
The starter has become wet or has become unusable.
The terminals may have oxidized, resulting in poor battery contact.
Malfunctions are often due to defects in spark plugs, which occur when using low-quality fuel. Also, the spark plugs could simply wear out, forming a large gap.
Another reason is a blown fuse.
Broken ignition relay.
It is possible that the wire supplying the starter or injector has been torn off.
The immobilizer is not working.

Fuel rail

On the ramp next to regulator 5 there is a control fitting 3. It is closed with a cap, which is unscrewed and then carefully pressed on the spool.

If fuel flows, it means it is entering the ramp. But perhaps the necessary pressure is not created. Reasons: clogged filter cylinder, pump malfunction, etc.

The pressure should be 350 kPa (3.5 bar). It is controlled by unscrewing the spool and installing a pressure gauge. Before checking, you need to reduce the pressure!

If fuel does not flow, notice whether the pump turns on when the key is turned to the “I” mark. When the ignition is turned on “cold”, the pump should run for 10 seconds.

Additional mounting block

Know that fuse F2 and relay P4 are responsible for turning on the pump. There is also a main relay P5, and all these elements are located in a block mounted on the same bracket with the ECM (see photo).

Even if the pressure is normal, the injectors may be clogged. In addition, their wiring may be damaged.

Case from practice

What happens if water gets into gasoline? In the summer - nothing. And in winter, the power supply system can become clogged with ice. All elements are at risk, from the pump to the injector valves!