About the sensor
The DPT is a conventional “frog with two contacts” for making and breaking. There are no complex electrical circuits in its device.
One of the contacts, which works to close, when you press the brake pedal, lights up the brake lights, which in turn signal the cars behind to brake.
The second contact, which opens when the brake pedal is pressed, opens its contacts and thereby sends a signal to the ECU to remove the load from the engine. This is necessary to reduce the fuel supply during the braking period, that is, when driving at high speeds (above idle) and when you press the brake pedal, the car begins to stop, and at this time the sensor sends a signal to the ECU to reduce the fuel supply through the injectors to reduce the speed and emissions of exhaust gases into the atmosphere.
The sensor is located on the pedal assembly under the steering column of the car; it is mounted on a plate with two nuts; they also carry out adjustment and control tightening.
The cost of a sensor in an auto parts store is up to 300 rubles.
Error P0504 Lada Granta, Kalina 2, pedal limit switch
Code P0504 Brake pedal A/B switches, signal mismatch
Code P0504 is entered if: - the signals of the brake pedal limit switches “14/23” are mismatched for more than 200 seconds with the engine running in idle mode; - or the number of presses on the brake pedal, determined by the signals of two limit switches “14/23”, differs by the value of the diagnostic threshold on a moving vehicle.
The malfunction indicator lights up on the 3rd trip after a permanent malfunction occurs. Description of checks
1 Checks whether code P0504 is active at the time of the request. 2 Electrical circuits are being checked. 3 Adjust the brake pedal switch gap. Diagnostic Information - The scan tool is in 1 Parameters mode; 1 General View" shows the status bit B_BREMS of contacts "23" of the brake pedal switch. — Monitor the state of contacts “14” using the brake light lamps. If a discrepancy between the signals of the “14/23” switches is detected, the engine control system will operate in emergency mode until the end of the current trip.
1 If the brake lights do not light up periodically or constantly when you press the brake pedal, check: — whether the brake pedal switch rod is jammed when you press the brake pedal; — check the presence of on-board voltage on contacts “1” and “4” of the brake pedal switch in the free and pressed state in accordance with the operating principle of the switch; — check the serviceability of the corresponding brake light circuit fuses; — check the condition and reliability of the connection of the contacts in the brake pedal switch block. 2 If, when you press the brake pedal with the side lights, direction indicators, reverse lights, and fog lights on, a faint glow of the brake lights is observed, check the reliability of the ground circuit of the rear lights. 3 Check the presence of on-board voltage on contacts “2” and “3” of the brake pedal switch in the free and pressed state in accordance with the operating principle of the switch.
Brake light wiring diagram for Lada Granta and Kalina 2
stop signal position
The brake light switch is part of the brake pedal assembly and is designed to send appropriate signals to the ECM when the driver presses/releases the brake pedal. In throttle-by-wire (E-throttle) systems, the brake pedal switch signals play an important role because they are used by the safety function of the ECM software. For this reason, it is very important to ensure that the brake light switch is always in working order. In the event of a discrepancy between its functional switching characteristics, for example, when spontaneously changing the adjustment values specified in the instructions (due to vibrations of the brake pedal, wear of the switch and pedal block), the car’s engine may go into emergency mode with forcibly reduced power. The size of the adjustment gap of the switch should be within 0.2...0.5 mm. The brake light switch has two groups of contacts, the first of which switches voltage from Cl. 15, and the second is voltage with Cl. 30, supplied to the brake light lamp. Both of these signals are sent to the ECM. When the brake pedal is released, the contacts of the first group should be normally closed, and the contacts of the second group should be normally open. If the brake light switch malfunctions, the controller stores its code in its memory and turns on the warning light. A fault code is also entered if the gap between the drive pusher attachment and the switch body is incorrectly adjusted
Causes of malfunction and their consequences
If there is an external or internal breakdown of the sensor on the Granta dashboard, the “Check Engine” will light up with error “P0504”. This error indicates a malfunction of the DPT.
Symptoms of a problem
- The car starts poorly and immediately stalls;
- The idle speed fluctuates;
- The motor does not develop the required power;
- Jerks when moving;
Reasons for failure
- The main cause of DPT failure is the spring, which returns the sensor contacts to their original position. If the spring breaks, the contacts do not return and remain in the final position, thereby the ECU continues to receive a signal that the car is braking and thus does not allow it to develop the necessary speed to complete the maneuver.
- A less common breakdown is the failure of the sensor housing, since the sensor is made of plastic, when removing or replacing it it is easy to damage it, which can harm its design and operating mechanisms.
- And the last reason is carbon deposits on the contacts. When the sensor is used for a long time, electrical deposits appear on its contacts, which soon leads to a poor connection between the moving contact and the fixed one.
Diagnostics
Before buying a new sensor, it is necessary to diagnose the DPT. It happens that the sensor nuts are unscrewed due to vibration and thereby its adjustment is disrupted, which can result in an error on the dashboard.
Check sequence:
- Press the brake pedal by hand and release, make sure that the sensor stop returns to its original position, thereby confirming that the return mechanism spring is working.
- Check the adjustment and tightening of the locknuts; with the brake pedal free, there should be a distance of no more than 0.5-1 mm from the sensor stop to the housing.
If any of these points are not met, you need to start replacing and adjusting the brake pedal sensor on the Lada Granta.
Adjustment or replacement?
In most cases, adjustments prevent problems. Replacement should be resorted to only if the above does not help. A number of malfunctions can be dealt with exclusively by replacing the handbrake or its individual parts.
So, if, when using the parking brake, the lever is pulled all the way, but this does not give any effect, most likely the cable has broken. Only replacing the element will help solve this. But if the lever simply does not rise and the machine does not lock in its place, the cable is simply jammed - you will be able to get by without any difficulties.
Removal and replacement
- We remove the “negative” mark from the battery, this is necessary to ensure safety during work, since the work is carried out on the electrical part of the car.
- Next, in the cabin, move the driver's seat back all the way and remove the mat. We find the sensor under the steering column, press the connector latch and remove it.
- We install the new sensor in the reverse order with the correct adjustment (0.5-1mm between the stop and the sensor body).
Description of the brake pedal sensor
Below we will find out how it works and how to replace it.
Purpose, location and operating principle
The essence of the system is that when you press on the brake, the piston in the cylinder begins to move. After this manipulation, fluid enters the brake system from the intake valve. It passes through the pipelines towards the main wheel mechanism, thus creating a suitable situation for the pads to move towards the wheel discs and drums. As a result, contact and subsequent braking occur. The controller itself turns on the brake lights.
Typical malfunctions and methods for their elimination
When “communicating” with a car, you can encounter various problems, but there is the most common and annoying problem. This problem is called error P0504, or otherwise “Brake pedal sensor mismatch.”
This malfunction often slows down the car. To solve this issue, you need to release the brake pedal and adjust the gap in the position sensor.
How to check
Turn on the ignition and press the brake pedal, the brake lights should light up. After releasing the pedal they should go out. If the lamps do not light up, check the brake pedal sensor and the voltage supply from the battery to the wiring harness block.
(Largus, Vesta, XRAY) Move the rod lock to the right position using a screwdriver. We check the brake pedal sensor using a multimeter in ohmmeter mode. Circuit 3-4 should be closed (resistance value is close to zero), and circuit 1-2 should be open (resistance should tend to infinity). After pressing the rod, circuit 3-4 should open, and circuit 1-2 should close. Before installation, move the rod to the left position.
(Priora, Kalina, Granta, Niva 4x4) Circuit 1-4 should be closed, and circuit 2-3 should be open. After pressing the rod, circuit 2-3 will close, and circuit 1-4 will open.
Thus, the cause of error P0504 may be:
- faulty sensor or its wiring
- Brake pedal sensor is not adjusted
- it is necessary to reprogram the ECM (instruction No. 46-15 for Lada Granta and Kalina 2 with automatic transmission, site users can download it)
To download files you need to log in to the site.
Description of the clutch pedal sensor
What kind of device is this and how to replace it is below.
Purpose, location and operating principle
The clutch sensor is installed directly on the clutch pedal. It influences engine control with an electronic gas pedal and provides a convenient and flexible control scheme for machine modes. On its own, it looks like a nondescript switch that has on and off modes.
Typical malfunctions and methods for their elimination
Video “Eliminating squeaks”
You can learn how to solve one of the problems associated with the clutch in a car from the video from the author Konstantin Biyanov.
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Good evening everyone, nothing interesting happened to the car, and then bam, today it means I’m not touching anyone’s food, I didn’t pay attention to how often I pressed the brake, but suddenly the car begins to slow down to such an extent that it seems that it stalls while driving and then but after 1.5 seconds it starts, I couldn’t believe my eyes, at first I thought the gear was knocked out, when I press the gas at 40 km/h it just doesn’t go, so + besides, there are no revolutions at all! In a panic, I went and refueled (it was 5L at that time), I thought it was petrol, I refueled, I gave it a ***, I accelerated, like normal, I parked the car near the house, I started it an hour later, an error pops up, fortunately I have a friend Lyo with a cable and a program in next door, I rush to him. We do the diagnostics, and here’s the most interesting part:
Having read on the Internet that either the sensor is faulty ****, or the stoppers may burn out and because of this it is tripping, but the stoppers are all burning, the previous ones are intact. Someone also wrote that the sensor may be poorly adjusted, and it works too often when the brake is pressed. They cleared the error, now I’m driving and looking, so far everything is fine, so far there is no desire to change the sensor.
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Source
How to adjust the brake light switch on LADA cars
On LADA cars, depending on the model and year of manufacture, AVTOVAZ used different brake light sensors (brake pedal position sensor or “frog”). During operation of the vehicle or when removing/installing the sensor, it must be adjusted. Do you know how to adjust this sensor yourself?
Brake sensor for E-gas, Lada Kalina, Priora, Niva 4x4 (VAZ 21214), 2114
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Old style sensor
On Lada Granta, Kalina, Priora and Lada 4×4 cars with E-Gas, a brake pedal position sensor with article number 1118-3720010 is used.
- Screw the sensor until the pedal goes down.
- Turn the sensor slightly (counterclockwise 90 degrees) and secure with a lock nut.
As a result, when the brake pedal is released, the switch rod should be completely “recessed”, and when the pedal is pressed, it should completely come out of the switch body. Details in the video:
