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> Engine: Camshaft Phase Sensor Repair, On a Twin Spark engine - DIY with affordable components
post 6th March 2013 21:33
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1.3 8v

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How works the sensors in a motor twin spark?

There are two sensors in the motor, a magnetic pickup, similar a electric guitar pickup called crank sensor, and a hall effect sensor called the phase sensor.

The crank sensor let the computer count the theet and the phase sensor gives the zero position, boths to synchronize the sparks and injectors time.

When crank sensor fails, the computer can't count (the motor can't start), but when the phase sensor fails (frecuently due to dirt in movement) the motor still runing and starting with the broken sensor until you disconnect the battery, and the computer losses the zero position value, the computer can't obtain again the value as the sensor don't work. Then you think a lot of others things because the motor was starting fine!

Well, the phase sensor is expensive (at least here), but you can repairit with a economic component, a low cost hall effect sensor (less than $2), TLE4905.

You have to weld with stain the three wires to the three pins. Figure shows how to connect.
Attached File  connect.PNG ( 4.21k ) Number of downloads: 316

Attached File  Foto0015.jpg ( 7.91k ) Number of downloads: 60

Then you must to fixit with epoxy, insert a plastic piece to let the space like original one, and remove when epoxy is hard. You can paint the plastic with oil to easy removement.
Attached File  Foto0018.jpg ( 10.08k ) Number of downloads: 211

Then you can remove the excess of epoxy with sandpaper. Install and assemble.

Pictures shows how was rebuilt. A piece of wire was used to fix the small component in the correct position when the epoxy was soft.
The motor start, at last after a month! With this sensor:
Attached File  Foto0020.jpg ( 16.04k ) Number of downloads: 230

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post 6th March 2013 22:19
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From: South Oxfordshire, UK

Thanks for posting this guide. Very useful. I've now moved it to the "how-to guides" section so it can be easily found if anyone else wants to try this smile.gif

We had a discussion on an alternative Honeywell hall sensor a while back (link below) but your solution is a much cheaper option as long as it stays together that is biggrin.gif


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