Home > Technical (L322) > fault code 2032 - intermittent cam bus failure |
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Joe90 Member Since: 29 Apr 2010 Location: Hampshire Posts: 6407 |
More likely CAN BUS ?
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7th Jan 2012 1:09am |
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the_engineer Member Since: 25 Aug 2011 Location: alexandria Posts: 42 |
sorry typo, well spotted, can bus it is.
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7th Jan 2012 1:21am |
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The Brains Trust Member Since: 23 Sep 2011 Location: Melbourne Posts: 155 |
Not sure if it is relevant on the RR's, but on other CAN bus systems I work on, errors can appear if the CAN resistance is not correct. Typically, there will be a terminating resistor at each end of the CAN bus - no idea where these would hide in the RR, but if one of the resistors open circuits, it causes the CAN resistance to become too high, and can introduce faults. Typical CAN systems have a 120 ohm resistor at each end, so the overall resistance would be about 60 ohms. If you can find a plug that has the CAN running through it, unplug it and check the resistance between the 2 CAN lines - this will need to be done with the battery disconnected.
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7th Jan 2012 4:04am |
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the_engineer Member Since: 25 Aug 2011 Location: alexandria Posts: 42 |
cheers gav. was not aware of that. if there is one ate each end of the circuit would they not act in series and come to 240ohm for two 120ohm resistors. i suppose measuring the resistance on the can bus is useless with no reference.
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7th Jan 2012 6:20am |
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The Brains Trust Member Since: 23 Sep 2011 Location: Melbourne Posts: 155 |
In that type of CAN bus, the resistors end up in parallel, so you would get 60 ohms. I've done a bit more research though, and it has a different system than what I am used to. The system as I described it runs in a fixed topography - daisy chain, with a terminating resitor on each end.
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7th Jan 2012 7:21am |
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the_engineer Member Since: 25 Aug 2011 Location: alexandria Posts: 42 |
thanks gav, all very interesting stuff. The only time I have worked with PWM is on modulated dimming controls of LED lighting systems. Should be WMM - White mans magic |
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7th Jan 2012 12:35pm |
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