Many motorists have encountered the fact that the temperature indicator arrow on the VAZ-2114 dashboard stopped showing, did not move from the zero position, or froze. But not everyone understands what causes this malfunction and how to fix it. In this article, we will consider possible options for the occurrence of such a breakdown and methods of elimination.
Video about diagnosing the temperature gauge (problem overview):
The video will tell you how to check and find the reason for the temperature gauge needle hanging up.
The main causes of DTOZh breakdowns
There are several possible reasons why this sensor may stop working. Namely:
- there is no contact with the sensor;
- damage to wire insulation or broken contacts;
- systemically inoperative fan;
- complete failure of the device.
Symptoms of a malfunction in the DTOZH are:
- the car engine has not yet warmed up to its normal state, but the fan is already running;
- a well-warmed engine refuses to work;
- Gasoline consumption has increased significantly.
Remember, before you start checking the coolant temperature sensor, you need to make sure of its location.
This is done so as not to accidentally confuse this part with the coolant temperature indicator sensor.
Elimination methods
Once the root causes have been identified, you can move directly to methods to resolve the problem.
To carry out repair and diagnostic operations, you will need some tools, namely: a multimeter, an OBD II cable, a tablet or laptop, as well as a set of keys and screwdrivers for dismantling the main and auxiliary components. So, now that the motorist is fully armed, you can proceed directly to the diagnostic and repair process.
The magnetic motor of the arrow drive is broken
The process of repairing and disassembling the dashboard The most common problem with the arrow hanging or not responding on the instrument panel is a breakdown of the drive motor. To diagnose this device, you need to use a multimeter to close the winding contacts to an electrical circuit or resistance.
If the tester does not show anything, then most likely the winding is burned out or there is a break in contact with the board.
To troubleshoot the problem, of course, it is recommended to contact an auto electrician, who will do everything quickly and efficiently, but if the car enthusiast has the necessary skills and abilities in repairing such equipment, then he will be able to independently replace the motor and solder the necessary contacts.
Types of temperature sensors
There are two temperature sensors on the VAZ 2114 car engine, which often leads to confusion when replacing them:
Location of temperature sensors
- One of them, DTOZH, is located on the cooling system pipe running from the block head to the thermostat. It sends signals to the computer's electronic control unit so that additional cooling (fan) is turned on in a timely manner. Don't look for it on the radiator; it was located there in previous models. Has two terminals.
- The second sensor is called DTUOZH, it has one terminal and sends a signal to the dashboard in the cabin, where the driver sees the temperature of the coolant (not the engine, as many people mistakenly think). It is located, as can be seen from the first figure, on the engine block under the cooling system pipe.
VAZ-2114 engine temperature arrow goes off scale: photos and videos
Many motorists have encountered the fact that the temperature indicator arrow on the instrument panel of a VAZ-2114 went up, beyond the red zone. This malfunction can be due to many factors. But, this problem is related to the electrical part of the car.
Why the temperature arrow goes off scale - the main reasons!
The normal operating temperature of the engine on the instrument panel is 90 degrees. The arrow indicates the red zone of engine overheating. Learn more about the situation when the instrument panel does not show the engine temperature.
You can find out why the malfunction occurred in your garage, and you don’t have to go to a car service center. But to fix the problem, you may need outside help from professionals.
So, let's look at the main reasons why the temperature arrow on the VAZ-2114 dashboard goes up:
- Dashboard diagram.
- Temperature sensor.
- Wiring harness.
- ECU.
Solution methods
The arrow is off the charts!
When the reasons are identified, you can proceed directly to eliminating them and consider the issue in more detail. So, to begin with, it is worth noting that the motorist will need some knowledge of the design features of the car, as well as knowledge of the electrical part.
Dashboard diagram
Dashboard board
The first place to look for a problem is the dashboard. In order to eliminate the malfunction, you will have to dismantle the “tidy” and also disassemble it.
The next step is to find the motor that powers the arrow. There may be two malfunctions here. Which ones exactly:
- Due to a short circuit, the motor winding burned out.
- The wire that is soldered from the motor to the dashboard board has come unsoldered or has come off.
To eliminate this cause, it is necessary to inspect the place and determine the presence of breaks. For complete reliability, it is necessary to ring the contact wires of the motor that close the winding.
Another stage of diagnostics will be the connector that connects to the board. It is necessary to find the contact that is responsible for the temperature indicator and also ring it using a multimeter. If a connection break is detected, it must be repaired.
Attention! If a motorist does not have experience in repairing such components, it is strongly recommended to contact professional auto electricians so as not to cause even more trouble when doing the repairs yourself. They will do everything quickly and efficiently
temperature sensor
The temperature sensor is checked with a multimeter
If the problem was not hidden in the dashboard, then you need to contact the temperature sensor directly. It is this that serves as an indicator of the engine temperature and transmits data through the computer to the needle. Failure of the product can cause a freezing effect and the needle on the dashboard going off scale.
To determine the functionality of the sensor, it must be dismantled and “ringed” using a multimeter. If it is determined to be “dead”, then it must be replaced.
Wiring harness
Disconnecting the wiring harness from the instrument panel for inspection
If the first two reasons are eliminated, but the problem remains, then you should look for the problem in the wiring harness that goes from the engine to the dashboard. Of course, not all motorists are able to cope with this type of diagnosis, due to ignorance of wire pinout. Therefore, in this case, it is also worth contacting professional auto electricians to find out the causes and repair. Although, the reason here is quite simple and understandable - a wire break or burnout.
ECU
List of ECU errors
It is not often that the problem of the needle leaving its normal position can be caused by an electronic control unit. It is he who sets all the parameters and signals on the dashboard.
To troubleshoot the problem, you need to connect to it and check for errors related to the temperature sensor and cooling system. Thus, a simple reset of errors can lead to normal operation of the device.
conclusions
There are not many reasons why the VAZ-2114 engine temperature needle goes off scale, but all of them are quite difficult to diagnose, and some can only be eliminated in a car service center. Therefore, if the motorist has not carried out repair operations of this nature, it is necessary to contact a car service center, where they will help and repair everything.
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Signs of trouble
Typical symptoms of DTOZ failure are as follows:
- Turning on the fan when the engine is not warmed up;
- A warm engine does not start well;
- Unstable engine speed at idle;
- Unstable engine operation (triggering, lack of traction)
- Gasoline consumption increases;
If the DTUOZH fails, the engine runs stably, without interruptions, but on the dashboard you see that the liquid does not heat up or does not cool down at all. These are all signs of a faulty DTOZH on a VAZ 2114.
Dashboard malfunction
The cause of incorrect readings on the dashboard may be a factory defect or a huge number of electrical faults: from a bad ground on the ECU to a failure of the voltage stabilizer (“tablet”). This can be indicated by uneven changes in temperature readings (jumps), incorrect readings of other devices, or a discrepancy between turning on the fan and the temperature readings.
We recommend: Installing a turbine on an 8-valve VAZ 2114 engine. This malfunction is less problematic: the car does not actually heat up, but only for the computer. But she discovers other problems that also need to be solved.
Troubleshooting steps
To identify a malfunction, experienced technicians do the following:
- They start checking with fuses, replace the burnt ones, and this can solve the problem;
- Inspection for external damage (melted plastic, insulation, chips)
- Remove the terminal by unfastening the latch and clean the contacts. If the problem is in them, then the operation of the motor will stabilize;
- Check the power circuit with a multimeter; lack of power will mean a wire break;
- Removing and checking the DTOZH;
Removing DTOZH
But checking the coolant temperature sensor on a VAZ 2114 requires removing it from the car. It can be removed simply:
Advice: it’s safer to work on a cool engine to avoid getting burned or scalded.
- Disconnect the terminals from the battery
- Remove the air filter together with the casing; to do this, disconnect the block with the wires and loosen the clamp on the pipe;
- Disconnect the block and loosen the clamp.
- Using a 19 mm socket or wrench, unscrew the bolts securing the housing to the body;
- Unscrew the bolts that secure the housing to the body.
- Disconnect the rubber support from the bracket that is attached to the battery shelf.
- From under the hood lock rod, remove the brackets of two more supports and remove the filter housing along with the air sensor and hose;
- Partially drain the liquid from the cooling system by replacing the container. To make the process happen faster, remove the cap from the radiator or expansion tank;
- Carefully disconnect the connector from the sensor; it has a special latch;
- Use a 21 key to unscrew the sensor;
Checking at home
After removal, it remains to make sure that the sensor is faulty. To do this, you need to know how to check the coolant temperature sensor on a VAZ 2114 yourself.
It is necessary to measure its resistance in a cold state and after placing it in boiling water:
- The resistance at the terminals of the device unscrewed from the car is about 3500 ohms;
- The resistance, after immersing it in a glass of boiling water, should be below 200 Ohms;
- Getting intermediate values is not so important;
If the readings are very different, then the DTOZH should be replaced. Look at its markings and purchase the same sensor. Then screw it in place of the old one and connect the connector to it. Don't forget to fill the system with antifreeze. Now you know how to check the DTO on a VAZ 2114.
OPERATING PRINCIPLE AND DESIGN FEATURES
The VAZ 2114 coolant temperature sensor, for all its importance for the normal operation of the car, is a fairly simple device. DTOZH is a resistor with variable resistance, which changes as the temperature of the antifreeze in the system increases.
The sensor has only two contacts - the first of them transmits information about the current coolant temperature to the brains of the fourteenth, and the second sends a signal to turn on the fan (when the coolant temperature reaches a certain point).
Based on the received readings, the fourteenth ECU determines the composition of the fuel mixture supplied to the combustion chambers: the colder the engine, the richer the mixture. The coolant temperature affects how almost all engine control systems will operate: this data is taken into account when adjusting the ignition angle (the moment the spark is supplied for fuel combustion in the cylinders), the time the fan is turned on for forced cooling of the power unit, and much more.
The DTOZH is a fairly durable design; it rarely breaks down, but if the unit breaks down, its repair is impossible - the device must be replaced with a new one. The cost of DTOZh varies between 400-550 rubles. for domestically produced models (the VAZ 2115 coolant temperature sensor costs about the same).
