Heating and ventilation of the interior remain an integral part of comfortable driving. The interior temperature sensor of the VAZ 2110 is one of the consumables that requires frequent replacement, since the heating system of the VAZ 2110 has a mileage of 20,000 km. starts working intermittently. How to check the part, repair and replace the controller.
Functional Features
The operating principle of the interior temperature control system for the VAZ 2110 and related models of the line is based on monitoring the signals that the controller transmits to the vehicle's ECU. The measuring element is based on a semiconductor thermistor; its operation is based on the relationship between the external air temperature and the resistance of the sensing element.
The working sensor is configured for a medium temperature range of 16–30 degrees Celsius. The higher the ambient temperature, the higher the resistance of the element, and a corresponding impulse is sent to the ECU. After processing the signal, the control unit issues a command to open/close the air dampers and increase/decrease the heat supply to the cabin.
A faulty temperature sensor in the cabin of a VAZ 2110 has an increased resistance on the winding and sends incorrect signals to the computer. The element is located in the ceiling trim block, next to the interior lighting.
Outdoor temperature sensor
On “Dozens” of later releases with a VDO dashboard with two displays and a trip computer, an outside air temperature sensor was installed. When the engine was turned on, the temperature readings outside the VAZ 2110 were displayed on the instrument panel screen.
The sensor is located inside the front bumper, next to the front fog lamp. The installation side of the device in each specific case may be different (on the driver’s side or on the passenger side). If the temperature sensor was installed by the owner himself, then most often it was taped with electrical tape to the base of the towing eye.
Catalog number of the original temperature sensor: 2115-3828210-03, its approximate price is about 250 rubles.
If the outside air temperature sensor does not work, remove the plastic protection of the left or right front wheel arch (depending on the location of the sensor), disconnect the wiring connector and remove the sensor from the holder in the front bumper. Installing a new part is performed in the reverse order.
Source
Signs and causes of malfunction
Structurally, the temperature sensor consists of a sensitive element, which is located on the electric motor board, which turns on the controller fan. A fan is needed to track the temperature of the environment with an error of 1–2 degrees. Since the sensor is a component of the car's electrical circuit, its operation is affected by the condition of the wiring, terminals, and connector integrity. Characteristic signs of controller failure.
- The device is buzzing. The fan in the controller unit is broken.
- The signal from the sensor does not reach the ECU. Broken wiring, worn chip wires.
- The sensor transmits an incorrect signal; the temperature in the cabin corresponds to the transmitted parameters. The board is dirty, the input voltage or output resistance is not normal.
Installing an outside air temperature sensor on a VAZ 2110
On VAZ car models of the tenth series, where an on-board computer was installed as standard, it was possible to record the outside air temperature on its display. However, the production of such cars was not mass-produced, and in most cases VAZs rolled off the assembly line without such an additional option. Recently, the manufacturer began, instead of conventional dashboards, to install VDO panels with two screens, which allows you to display outside air temperature readings directly on the tidy display. How to connect and install the sensor on a VAZ 2110 car is described in detail in this publication.
Before starting the installation, you need to buy an air temperature sensor , its catalog number is 2115-3828210-03 , the price at which this part is offered in the retail chain is approximately 200 rubles.
Checking settings
Before replacing, you need to check the settings in the interior heating and ventilation system. In 20% of cases, incorrect set parameters are the reason that the air conditioner in the car does not work well in the summer, and the stove does not work well in the winter.
To do this, you need to close the doors and windows in the car and set a certain temperature in the cabin, for example 25 degrees. Place a thermometer near the sensor. After 15 minutes, check the thermometer reading. If the difference is more than 1 degree, adjust the sensor through the adjustment screw on the device. Scrolling clockwise will increase the range, counterclockwise will decrease the maximum temperature threshold.
Symptoms of sensor failure
Despite the simplicity of the design of this element, the part still periodically fails. A sensor malfunction can be determined by the following symptoms:
- When the air supply temperature on the panel changes, the sensor begins to buzz. This indicates a breakdown of the fan in the sensor.
- The absence of a signal from the sensor is a clear sign of a break in the wiring to it. It is enough to visually inspect the connection points of the wires and identify the location of the break.
- Transmission of an incorrect signal is another sign of sensor failure. With such a breakdown, the stove does not maintain the set temperature parameters in the cabin.
Trying to repair a faulty sensor is a long and pointless task. The cost of a new unit for determining the temperature in the cabin is low, so it is much easier to read the instructions for replacing the sensor and carry out the work yourself.
How to replace
For VAZ 2110, the element is mounted to the ceiling trim using four latches. Dismantling process step by step.
- Unclip the outer cover.
- Remove the wire block, disconnect the connector and check the integrity of the cables.
- Check the cleanliness of the board, remove dirt with a soft brush.
If the sensor is buzzing, it is not practical to repair the equipment; the controller is replaced with a new one. If after a visual inspection no breakdown is found, all contacts are clean, the wiring is normal, check the sensor with a multimeter. The tester is switched to resistance measurement mode and the signal from pins 1 and 2 is monitored.
Zero resistance indicates that the element is not working. If the device shows a resistance of 0.2 Ohm, the sensor must be placed in the freezer for 5 minutes. Repeated measurement of the resistance on the working sensor will be in the range of 2–3 ohms, that is, it will increase at least 10 times.
Replacement of consumables is carried out independently and requires 5 minutes. The only tool you need is a flat blade screwdriver. The cost of the controller is quite budgetary, from 300 rubles. The service life is from 1 year, so the element is not repaired.
Connecting the air temperature sensor
Before you start connecting the ambient temperature sensor, you need to determine the model of the on-board computer and find documentation on its connection.
Instructions for connecting the air sensor to the VAZ trip computer
As for connecting the temperature sensor to the trip computer, everything is simple. We determine the device model and, in accordance with the connection diagram, connect the wire from the sensor to the required contact. For example, VAZs of the tenth family were equipped with two types of on-board computers MK-2112 and AMK-211001. The connection instructions say that the contact of the sensor we are interested in should be connected to contact C4 of the MK block, and the contact attached to C4 should be disconnected and isolated.
After connecting the sensor, calibrate its readings in the computer settings, otherwise the received data may not be correct. How to calibrate the temperature of the outside air sensor, see the instructions supplied with the trip computer.
Instructions for connecting the air sensor to the VDO panel of a VAZ with two displays
VDO instrument panels with two displays were installed mainly in luxury VAZ 2115. However, even the premium assembly did not include a temperature sensor that would transmit readings to the display window. You can correct the manufacturer’s greed by installing a temperature sensor and connecting it directly to the instrument panel itself. To do this, you need to connect the information wire of the temperature sensor to the red block of the X2 panel to socket No. 1. If a wire is already attached to this contact (in most cases this is the wire of the fuel level sensor in the tank), then they are combined.
Note! If after connection the display shows -40, then there is an open circuit between the sensor and the panel.
Source
Do-it-yourself replacement – there’s nothing better
VAZ 2110 interior temperature sensor
If the driver decides to entrust the work of replacing this sensor to a professional, he needs to have a certain amount of money in his pocket and, upon the first request of the service station workers, pay for the work done. After the replacement work and payment for the service are completed, the car can be used again. To carry out independent repairs, you need to perform several simple operations.
Messages 5
1 Topic from mars.rus 2015-01-04 20:04:53
- mars.rus
- New member
- Inactive
- Registration: 2013-12-12
- Messages: 25 Thanks : 3
- Car: VAZ 21102
Topic: How to check the interior temperature sensor?
Hello. The heater in my car was not working properly. Car 2001 8kl. In general, from the max position, when switching back to the direction of decreasing temperature, the damper began to rotate only when the handle reached the 20-degree position. And the damper immediately lowered to the end. And the same in the opposite direction. And before that, in general, the damper only moved either all the way down or up when switching from max or min. Between these intervals, when switching, it did not react at all. As a result, by disconnecting the contacts from the ceiling sensor, everything began to be regulated. I blame the ceiling sensor. Although it works, it buzzes in all positions of the handle except min or max. Maybe someone else can confirm my guesses or give a different opinion, maybe there’s something else I need to look at? Thank you.
How does the DTV work?
The heating system in a car of this brand operates from impulses coming from the electronic unit. The unit itself receives information from the fuel combustion engine and compares these indicators with the heating intensity. There are certain temperature limits, the crossing of which is a trigger for the system to operate and the motor to turn on. There is a change in air flow and fan speed. All this serves to timely warm up the glass and the interior.
The sensor itself is a regular thermistor or semiconductor resistor. The relationship between resistance and heat is captured and sent to the vehicle's ECU as a specific measurement.
In addition to the obvious problems in measurements associated with a defect in the meter, there are a number of other malfunctions that one has to deal with:
- electrical wiring fault;
- mechanical damage to the sensor;
- operation outside acceptable limits.
Electrical wiring can be easily repaired by cleaning the contacts or reconnecting them more reliably. It happens that a break may not occur in the sensor itself, but somewhere along the line. Any malfunctions with the device itself are a reason to replace it, since repairing such a device is usually ineffective and more expensive than buying a new device.
