Technical phonic wheel

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Technical phonic wheel

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just had a diagnostic done on my sei mpi to see what the flashing ecu light was about and it came up phonic wheel manual reset required can anyone ex plain what phonic wheel is about and how to do a manual reset
 
This is old and probably no use to the OP, but I haven't seen it mentioned in the cinq section yet, so it may prove useful too some people.

If you replace the crank sensor or mess with it or the crank pulley, you should teach the ecu the new sensor and settings. This is called phonic wheel learn.

This is necessary as the sensor is inductive and measures a changed of magnetism cause by the crank ring turning, and is very sensitive.

To perform it, make sure the gap is ok, 0.8mm -> 1.5mm from the top of the notch to the face of the sensor.

Rest the ECU by disconnecting for 15 mins. Start it and let it get to temperature by idling (wait for the fan), then rev hard (above 5000rpm) and lift off immediately until it idles again. Do this 3 times and turn of the engine.

Job done.

Kristian
 
Due to slight manufacturing tolerances (crank pulley is often a very slight oval shape) the gap between position sensor & pulley is critical it is necessary for the ECU to learn the shape of the pulley....thus 'phonic wheel learn'.
 
This is old and probably no use to the OP, but I haven't seen it mentioned in the cinq section yet, so it may prove useful too some people.

If you replace the crank sensor or mess with it or the crank pulley, you should teach the ecu the new sensor and settings. This is called phonic wheel learn.

This is necessary as the sensor is inductive and measures a changed of magnetism cause by the crank ring turning, and is very sensitive.

To perform it, make sure the gap is ok, 0.8mm -> 1.5mm from the top of the notch to the face of the sensor.

Rest the ECU by disconnecting for 15 mins. Start it and let it get to temperature by idling (wait for the fan), then rev hard (above 5000rpm) and lift off immediately until it idles again. Do this 3 times and turn of the engine.

Job done.

Kristian

hi do you disconnect the ECU or the Battery many thanks for advice craig(y)
 
Hi,
Just disconnect the battery.
As a side note the term "phonic wheel" comes from when similar wheels and pickups were used to produce audio tones in electrical test equipment and musical instruments. Hammond electric organs used this technique. in test equipment you could have two pickups and by adjusting the position releative to each other generate two outputs of differing phase.

Robert G8RPI.
 
This is old and probably no use to the OP, but I haven't seen it mentioned in the cinq section yet, so it may prove useful too some people.

If you replace the crank sensor or mess with it or the crank pulley, you should teach the ecu the new sensor and settings. This is called phonic wheel learn.

This is necessary as the sensor is inductive and measures a changed of magnetism cause by the crank ring turning, and is very sensitive.

To perform it, make sure the gap is ok, 0.8mm -> 1.5mm from the top of the notch to the face of the sensor.

Rest the ECU by disconnecting for 15 mins. Start it and let it get to temperature by idling (wait for the fan), then rev hard (above 5000rpm) and lift off immediately until it idles again. Do this 3 times and turn of the engine.

Job done.

Kristian


hi thanks i'm just checking been told by someone else on here that you have to hold the revs over 5000 for 3 seconds is this right or do you just lift off after 5000 :confused:
 
Idle up to operating temperature
5000 Rpm and lift off
Idle
5000 Rpm and lift off
Idle
5000 Rpm and lift off
Idle
Turn ignition off
Restart engine flashing light should now be cleared
 
Idle up to operating temperature
5000 Rpm and lift off
Idle
5000 Rpm and lift off
Idle
5000 Rpm and lift off
Idle
Turn ignition off
Restart engine flashing light should now be cleared
I think first you let the cooling fan kick in twice, at least thats what had to be done to reset the phonic wheel on the Multipla.
 
When I reset mine after fitting a new ECU I just let it idle up to temperature (fan cut in) and then went for it

I had never heard of Phonic wheel reset and was pretty amazed when it cured my flashing light problem
 
hi thanks i'm just checking been told by someone else on here that you have to hold the revs over 5000 for 3 seconds is this right or do you just lift off after 5000 :confused:


well i did try it both ways:bang: to make sure i had done it the right way but didn't fix my car :cry: new camshaft sensor and reset light and hasn't come since and finger crossed it won't:slayer:
 
just had a diagnostic done on my sei mpi to see what the flashing ecu light was about and it came up phonic wheel manual reset required can anyone ex plain what phonic wheel is about and how to do a manual reset
 
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