Anyone got any ideas what is causing this and, more importantly, how to fix it? My Mondeo's trip computer's external temperature function has started misbehaving. With the ignition on, it will give the correct reading. However, when you start the engine, the displayed temperature starts to step down, one degree at a time, to varying but obviously incorrect readings - the "record" is -40=B0C!
Mondeo external temperature sensor readings
Apr 15, 2007
5 Replies
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Sounds somewhat similar to that on my long departed Safrane - improved temporally after a dealer service.
Possible faulty earth somewhere.
In news: snipped-for-privacy@e65g2000hsc.googlegroups.com, Stephen Leak wittered on forthwith;
Faulty weather.
Stephen Leak brought next idea :
Sounds to be unlikely that it would be to blame, but an easy check is to change the sensor. On the Granada and Scorpio it is located at the front, below the bumper. Its a small black module which just clips into a hole, pull the spring back and it should drop out. Try unplugging and plugging it in a few times, it might have suffered a little contact corrosion due to its location.
An update - since posting my original, the damned thing seems to be behaving itself! I will still give the connector - even though it looks pretty well sealed - a blast of contact cleaner, though. I wondered about a faulty earth too at first, especially as the fault was so intermittent, but all of the computer's other functions give steady and plausible readings.
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