A dodgy Ecu Speed Sensor perhaps?

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and
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A dodgy Ecu Speed Sensor perhaps?

Post by and » Mon May 20, 2013 3:54 pm

Hi,
For a while, I have had an intermittent problem with a 5k rev limiter.
I understand it is linked to the connector that sits astride the right rear wishbone, running from the ECU speed sensor.
This connector has been cleaned several times & well sealed.
Is there a clean up job I should be doing to the sensor itself? Or just focus on the connector?
I did replace the speedo sensor recently which was quite well corroded, but havent checked the condition of the ECU speed sensor yet.

Any feedback is appreciated,
Andy

pete757
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Re: A dodgy Ecu Speed Sensor perhaps?

Post by pete757 » Wed May 22, 2013 3:54 am

Almost certainly the connection if you have replaced the sensor. The ECU is very well protected inside the cabin so I think it would be unlikely to be that.

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Re: A dodgy Ecu Speed Sensor perhaps?

Post by tlracer » Wed May 22, 2013 6:56 am

Check also the trigger wheel - as these sensors work based on a fluctuating magnetic field, any rust/ferrous material in the slots of the wheel can cause a poor signal to go back from the sensor to the ECU.

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Benja
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Re: A dodgy Ecu Speed Sensor perhaps?

Post by Benja » Wed May 22, 2013 7:21 am

I had this on my car and as Pete indicated the root cause was the connection not the sensor. The wire had worn away somewhere on its way to the ECU.

and
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Re: A dodgy Ecu Speed Sensor perhaps?

Post by and » Thu May 23, 2013 8:06 am

Appreciate the feedback lads, interesting point regarding the trigger wheel.
When I replaced the lhs speedo sensor, did notice the corrosion on both trigger wheel & sensor... so expect same condition on rhs.
Will give them a clean, plus take another look at the connector.
Benja, hope it is not a dodgy wire... not quite as simple, I can cope with simple!!
Cheers

and
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Re: A dodgy Ecu Speed Sensor perhaps?

Post by and » Tue Jun 25, 2013 11:50 am

Just returned from another successful Le Mans trip, no 5.5k rev limiter even in the wet... believe the cullprit or partly responsible cullprit was a split vacuum hose adjacent to the fuel rail. The engine revs superbly now!!

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Benja
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Re: A dodgy Ecu Speed Sensor perhaps?

Post by Benja » Tue Jun 25, 2013 12:01 pm

Good news, gotta do Le Mans one year...or N24

and
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Re: A dodgy Ecu Speed Sensor perhaps?

Post by and » Wed Jun 26, 2013 9:10 pm

Benja, lucky to have seen a few different motorsports over the years, love the 24hrs... But if you want a recommendation, just get to the TT!!

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