Best card diagnostic solutions
  • Fast Dispatch And
  • Highest Quality
    Standard & Safety
  • 100% Satisfaction
  • Best Value for
    your money
  • Great Customer

Toyota RAV4 (2007)

Toyota RAV4 (2007) 1

Without keyword

When you buy a car and the seller says: – Is the light on the panel on? Come on, there’s nonsense! Delov for five minutes in any car service. And I’ll give you a discount for this. Well, hands on?
… and when they say this to you – better not believe it, it’s a blatant deception, because after buying a car you have to spend money, time, nerves. And even that is not a fact that it will be possible to eliminate the “nonsense” in a car service. Some auto centers cannot solve such issues.

A car got into our car service with a malfunction: “open circuit of the front right sensor of the ABS system”.

“There are MRE speed sensors on this car, they cannot be checked with an ordinary tester,” he probably said out loud, because the client confirmed: “I was in another service recently, they rummaged and said that they can only check by replacing a similar sensor but they don’t have a substitute.
– And then what? ”I asked
– Offered to buy a new.
– Just take it and buy it? And if the reason is not in the sensor?
– Well … then all responsibility rests with me, they said.
– Cool! – I summed up.
Really cool. Already how many pages are written on the Internet for these sensors, and things are still there, live in the century of old speed sensors. But is the devil really terrible?

Here is this sensor that works on the principle of magnetoresistive effect.

Toyota RAV4 (2007) 2

The word is scary, but in fact everything is simple.
Such speed sensors (Active Wheel Speed ​​Sensor) belong to the so-called “active sensors” and for their work requires 5 or 12 volts. Let’s start by comparing the operating principles of an active speed sensor and the so-called “passive”, that is, familiar to all of us induction. Everything is clear in the pictures, I think, no need to explain.

So, the principle of operation of the passive speed sensor:

Toyota RAV4 (2007) 3

On the left is the waveform that can be seen during its normal operation. Right: “A” – the required air gap and the so-called “speed controller” or “comb” (open).

Next, we look at the principle of operation active speed sensor:

Toyota RAV4 (2007) 4

1. Multipole ring – multi-pole ring (photo will be below)
2. Sensor – consists of magneto-resistive elements
3. Sensor housing
Multipole ring – represents a magnetic layer deposited industrially, moreover, it consists of alternating N and S poles arranged in a circle and integrated into a bearing, for example, into an inner ring, as in the photo below.

Toyota RAV4 (2007) 5

This is a photo from previous repairs and it can be seen here that this magnetic layer collapsed, which was the cause of the ABS system malfunction in the car. By the way, if you look closely, on the remaining layer you can see clear segments, which are exactly the poles of N and S.

When the wheel (and, of course, the bearing) rotates, the N and S poles alternately pass the sensor (magneto-resistive element), which gives a digital signal to the control unit. It should be noted that Active Wheel Speed ​​Sensor , unlike an inductive type speed sensor, it can record speed starting from zero.

It must be assumed that such sensors will be used everywhere (until they invent something new), and they have these advantages compared to inductive speed sensors:
1. Determination of speed starting practically from zero value
2. Determining the speed of movement both forward and backward
3. The design is lighter and more reliable.
4. Low sensitivity to electromagnetic interference
5. Low sensitivity to changes in the air gap between the sensor and the magnetic ring
6. Good tolerance to temperature fluctuations, vibration
To fix, I propose to see a few screenshots and photos:

The difference between passive and active speed sensors

Toyota RAV4 (2007) 6

Passive and active speed sensor signals

Toyota RAV4 (2007) 7

Toyota RAV4 (2007) 8

Location Multiple ring (multipolar ring), options:

We assume that the principle of operation of active speed sensors figured out. Well, we go further: we need to understand the specific cause of the malfunction? The trouble code that the scanner provides is just a code, a description that looks like a cloud of assumptions:
– the speed sensor itself is faulty
– faulty electrical wiring (open, short, etc.)
– problems in contact groups (connectors)
To check the speed sensor, I used a device that I invented and assembled on my own and which I already spoke about, watch the video:

It turned out that the speed sensor is in good condition, and the problem most likely lies with the electrician – somewhere there is a bad contact, a break or the like.
After inspection, the malfunction was detected:

Toyota RAV4 (2007) 9

Please note that on the right side of the photo, where the harness goes into the engine compartment, the metal has a roughness. That is, it was once ruled to give a decent look (and sell, naturally!). Conclusion: “Once the car was in an accident, there was a blow to the right”.

In the photo: everything has been restored by electrics. And as it was, I can only say in literary words: “I would have to tear my hands off for such a job!” How exactly was it? The wires are twisted in a hurry, somehow, the electrical tape is wound with “gaps” – just to hold. “And why not?”, – probably those who twisted the electrical tape thought (of course … they would only have to throw off the car and sell it, but the grass doesn’t grow there … “)

Well, I did it reliably and almost for centuries: on adhesive heat shrinkage, carefully, carefully. Why redo the work twice?

Bye. All successful repairs and repairmen!


  • Toyota RAV4 (2007) 10

    New Toyota RAV4

    Toyota’s legendary RAV4 – new face A new modification of the famous model of the Japanese manufacturer Toyota RAV4 was shown to motorists at the auto…

  • Toyota RAV4 (2007) 11

    Hyundai Santa Fe (2007)

    Without keyword This car came with a problem: “The speedometer is not working.” To the question “how exactly doesn’t it work?”, The client replied that…

  • Toyota RAV4 (2007) 12

    Toyota Sienna

    Without keyword The first hundred thousand kilometers, the car owner does not even think about the question “what kind of gearbox does it cost and how…

  • Toyota RAV4 (2007) 13

    Toyota Estima Hybrid (AHR10)

    Without keyword Estima in a 10 body is an inexhaustible source of faults! To repair a hybrid Estima is generally a pleasure. You never know what new…

About admin

Leave a Reply

Your email address will not be published. Required fields are marked *

© Copyright 2018 Carscanners. All rights reserved.

Enjoy this blog? Please spread the word :)