Simon_CSK Posted June 28, 2014 Share Posted June 28, 2014 I keep getting a message on my dash which warns that the gearbox is over heating. This is probably not an uncommon fault however when I get it the car has only just started or has only done a few yards so there is no possibility of overheating. Does anybody have ideas what is wrong before I hook it up to a computer? Quote Link to comment Share on other sites More sharing options...
elbekko Posted June 28, 2014 Share Posted June 28, 2014 Probably a broken sensor or a bad ground? Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted June 28, 2014 Share Posted June 28, 2014 ... before I hook it up to a computer? I'd suggest finding where the sensor is, then getting an eyeball and hands on experience. A) You may not need the computer. B) If you do decide you 'need' the computer, what you have experienced may resonate with the judgement displayed by the writer of the computer programme, all those years ago. :-) HTH Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted July 2, 2014 Author Share Posted July 2, 2014 I have two spare gearboxes so there should be a sensor on one of them. i have a friend with the software and a computer so it may be worth the time. Quote Link to comment Share on other sites More sharing options...
David Sparkes Posted July 2, 2014 Share Posted July 2, 2014 I'm afraid I was being a little oblique when I wrote I'd suggest finding where the sensor is, then getting an eyeball and hands on experience. I recalled, but did not double check, that the sensor was part of the oil cooler. I've now double checked, and my recollection was correct. Transmission fluid from the gearbox is circulated through a cooler located at the front of the radiator.Fluid lines from the transmission are connected to each end tank of the fluid cooler. A temperature sensor on the LH end tank provides the instrument pack with an input of transmission fluid temperature. If the temperature exceeds between 120 and 130 °C (248 and 266°F). the instrument pack message centre displays 'GEARBOX OVRHEAT'. The message remains displayed until the temperature of the fluid returns to between 82 and 88 °C (180 and 190°F). I'd suggest corrosion of the terminals or wiring could cause a resistance reading to be detected which would normally indicate a fault, if it was due to the sensor itself. HTH Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted July 2, 2014 Author Share Posted July 2, 2014 I'm afraid I was being a little oblique when I wrote I recalled, but did not double check, that the sensor was part of the oil cooler. I've now double checked, and my recollection was correct. I'd suggest corrosion of the terminals or wiring could cause a resistance reading to be detected which would normally indicate a fault, if it was due to the sensor itself. HTH Cool Thanks David I have three coolers s find one working sensor. Will need to sort the head gasket first though Quote Link to comment Share on other sites More sharing options...
dave88sw Posted July 14, 2014 Share Posted July 14, 2014 Your battery is getting weak... Seriously. The p38 throws up all sorts of silly messages when the voltage gets just slightly low after starting, gearbox overheat is a favourite. If it doesn't come up with it while driving i would suggest you ignore it. Quote Link to comment Share on other sites More sharing options...
Simon_CSK Posted July 19, 2014 Author Share Posted July 19, 2014 Your battery is getting weak... Seriously. The p38 throws up all sorts of silly messages when the voltage gets just slightly low after starting, gearbox overheat is a favourite. If it doesn't come up with it while driving i would suggest you ignore it. Dave That is very plausable. My battery has just fallen over. Am going to get the overheating sorted in the next couple of weeks so once I have had a chance to drive it again I will see if a new battery cures it Quote Link to comment Share on other sites More sharing options...
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