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P0500 - Vehicle Speed Sensor


 
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frog1520
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Joined: 05 Dec 2018
Posts: 6
Location: UK

PostPosted: Mon Feb 25, 2019 23:53    Post subject: P0500 - Vehicle Speed Sensor Reply with quote

Hello!

Was using cruise control on my 120 D4D (2006) earlier and everything was fine; after about 20 miles or so, the green cruise light flashed and cruise disengaged itself.

Then some lights came up on the dashboard -- check engine light, VSC/TRC, VSC-OFF and 'Slip Indicator' light.  If I stop and restart the car, the lights go, but then come back after about a minute.

Put a code reader on it, and got a P0500 code talking about VSS - vehicle speed sensor.  Any idea which part this is and where its located, or any other clues?

The engine was fine, the speedo is working and its changing gear OK, so it obviously does know its own speed somehow.  

Very grateful for any advice!

Thanks!!
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frog1520
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Joined: 05 Dec 2018
Posts: 6
Location: UK

PostPosted: Mon Aug 19, 2019 11:49    Post subject: Reply with quote

Update on this:

- The speed sensor on the gearbox was changed - no difference

- Toyota said it was the ECU.  Replaced the ECU, no difference.  Put a scope on the ECU speed wire - it only gets a strong signal (high voltage) when in reverse - not forward.  Made me think a sensor might be back to front, or the wires crossed somehow - but is that possible/feasible?

- The speedo works OK.  The speed sensor wire goes to the instrument cluster - and the speedo works fine.  The cluster then 'shapes' the speed signal for the ECU.  I thought the shaping circuit in the cluster might be broken, but replacing the cluster did not fix it either.

Anyone have any ideas, on this problem that nobody can seem to fix?

Thanks!
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