Help Please my STI wont rev over 4500
24 February 2010, 10:09 PM
#1
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Help Please my STI wont rev over 4500
Hi guys if this is in the wrong section i am sorry.
ok problem is i have 1999 sti v6 estate the speedo doesnt work i cant go over 4500 revs. I went the subaru garage they new straight away it was the speedo sensor but still i would rather pay £45 to get it checked and it came up as the sensor. I changed that today put new sensor in and it still the speedo doesnt work and wont let me still go over 4500 rev what shall i do now will it need to be reset please help thanks
ok problem is i have 1999 sti v6 estate the speedo doesnt work i cant go over 4500 revs. I went the subaru garage they new straight away it was the speedo sensor but still i would rather pay £45 to get it checked and it came up as the sensor. I changed that today put new sensor in and it still the speedo doesnt work and wont let me still go over 4500 rev what shall i do now will it need to be reset please help thanks
24 February 2010, 10:52 PM
#5
Resetting ECU wipes any learnt settings (other than the actual non-volatile map, obviously!)).
So you're telling it to forget about the reason why it went into gearbox speed sensor failure mode. Hopefully, when reset, it should immediately see that a new, 'within spec' speed sensor is fitted and you'll get your full revrange back....
So you're telling it to forget about the reason why it went into gearbox speed sensor failure mode. Hopefully, when reset, it should immediately see that a new, 'within spec' speed sensor is fitted and you'll get your full revrange back....
Last edited by joz8968; 24 February 2010 at 10:54 PM.
24 February 2010, 11:07 PM
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thats fine.. big question if i disconnect my battery for an hour a so will it defo reset my ecu.. if not shell i use jollygreenmoster.co.uk.. please any 1
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24 February 2010, 11:31 PM
#8
I'd reset it by the 'correct' wires under the dash method. If your car's symptoms was defo because of the speed sensor, then there's no reason why it shouldn't sort it.
But I'm a little concerned, as it shouldn't really be needed if a new sensor has been put in.
But I'm a little concerned, as it shouldn't really be needed if a new sensor has been put in.
24 February 2010, 11:54 PM
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If you are saying that you've just replaced the speed sensor on the gearbox, and the speedo still doesn't work, then resetting the ecu isn't goint to help at all - You still have a fault that is preventing the ecu from getting a speed sensor input signal.
Either dodgy wiring, clocks are faulty, or if you have a Kmh/Mph convertor fitted, then that could be the cause of the problem.
Either dodgy wiring, clocks are faulty, or if you have a Kmh/Mph convertor fitted, then that could be the cause of the problem.
Last edited by FB Tuning; 24 February 2010 at 11:55 PM.
25 February 2010, 08:37 AM
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If you are saying that you've just replaced the speed sensor on the gearbox, and the speedo still doesn't work, then resetting the ecu isn't goint to help at all - You still have a fault that is preventing the ecu from getting a speed sensor input signal.
Either dodgy wiring, clocks are faulty, or if you have a Kmh/Mph convertor fitted, then that could be the cause of the problem.
Either dodgy wiring, clocks are faulty, or if you have a Kmh/Mph convertor fitted, then that could be the cause of the problem.
25 February 2010, 10:58 AM
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i will check out if the wire or the convertor is loose should that still stop it from going over 4500 when i go over it jerks and wont let me
25 February 2010, 11:47 AM
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limp mode so that means safe mode.. sensor should be fine i bought a brand new one for it. well got battery disconnected. i just hope its not a big problem
25 February 2010, 05:54 PM
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ok guys i have good news and bad news. i just re connected a new battery up the check enginge light has gone off it revs over 4500 revs and my god is it fast the bad news is the speedo doesnt work any one help on this
25 February 2010, 07:28 PM
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the light will come on and the 4500pm rev limit will return. The fault is likely to be with the speedo converter wiring or the unit itself. You can easily check if the sensor has 12v and an hi/lo 5v output.