scooby classic check engine light
hi all my check engine light has come on again first it was knock sensor then lambda sensor but this 1 puzzles me it came on and off yesterday for few seconds and again this morning now it stays on i have plugged black and green plugs in again but it doesnt flash like b4 to give me the code also it is now idling at around 1.5k then back down to below 1k can any1 help me make any sense of this please thx lee
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Try resetting the ECU. Then see what you have.:thumb:
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lol soz how do i reset ecu also dont know if this makes a difference the cars a import
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You can follow these instructions, or disconnect the battery for an hour (or over night).
Import doesn't make a difference at the moment, but more details of the car would help, year and any mods etc.;) |
its a 1994 import totally standard
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Originally Posted by b13bat
(Post 9664931)
[B][I][COLOR="Green"]You can follow these instructions, or disconnect the battery for an hour (or over night).
Originally Posted by jonesy79
(Post 9664890)
hi all my check engine light has come on again first it was knock sensor then lambda sensor but this 1 puzzles me it came on and off yesterday for few seconds and again this morning now it stays on i have plugged black and green plugs in again but it doesnt flash like b4 to give me the code also it is now idling at around 1.5k then back down to below 1k can any1 help me make any sense of this please thx lee
Short answer is that if your check engine light is on constantly, and you can't reset the ECU via the proper procedure, you need to fix something. |
Originally Posted by jonesy79
(Post 9664890)
hi all my check engine light has come on again first it was knock sensor then lambda sensor but this 1 puzzles me it came on and off yesterday for few seconds and again this morning now it stays on i have plugged black and green plugs in again but it doesnt flash like b4 to give me the code also it is now idling at around 1.5k then back down to below 1k can any1 help me make any sense of this please thx lee
Originally Posted by Splitpin
(Post 9664990)
Disconnecting the battery for a period longer than a few minutes will reset the ECU but doing it this way is a counterproductive, bad idea. Using the black plug + green plug + drive routine as per JGM's website runs an active error check on all the car's systems. If it doesn't complete correctly, it is because there is a current problem that must be fixed.
No offence Splitpin, just explaining myself.;) |
Originally Posted by b13bat
(Post 9665071)
Counterproductive, yes. But the OP states that the CEL is not flashing as expected during diagnostics, (assume no steady on/off and no code) so my thinking was 'a clean slate' by dropping the battery and the 'if' there is a fault it would flash up on the first drive.
No offence Splitpin, just explaining myself.;) Either way, persevering with the reset procedure is the best way to learn what's up. There's a timeout built into it - on the later classics it's 300 seconds if I remember right. If it hasn't okayed by the timeout, it automatically tells you what sensors aren't in spec. One way or the other, in other words, it will/must give either an okay or an error. |
heeeeellllllllllllllllllppppppppppppp please
hi done the ecu reset and engine light still on and wont give any codes when black and green plugs connected also wont start in mornings takes a few turns of the key runs lumpy for few seconds and cuts out if any revs are given but ok after minute or so also engine fans are on constantly even after car has been standing overnight any advice more than welcome thx
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u are remembering to disconect black and green wires after looking for fault codes.
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check all the earth straps to the battery incase its a dodgy earth,as had a problem and it was down to a faulty earth if u are near essex i would go through fault code procedure with you.
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faulty fan switch causing fans to come on a dodgy battery causing voltage drop and causing fan to kick in but all these are assumptions and not by all means correct.
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thx kevin will have a look at that in morning any thoughts on why it wont start first time after been standing overnight it runs just as well as b4 when temp comes up a little dnt know why it wont flash the codes as it did a few moths ago and i had to change knock sensor then it told me codes again few weeks later when i had to change lambda sensor but this time it doesnt flash when plugs are connected just stays on
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Originally Posted by jonesy79
(Post 9668666)
hi done the ecu reset
and wont give any codes when black and green plugs connected |
ther is another way of fault code check and that is just connect the black wires and turn ignition till the check engin light comes on but dont start the car then check the fault codes,thatsthe way i check em and there is nothing wrong diong it the other way either.
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Originally Posted by jonesy79
(Post 9668700)
thx kevin will have a look at that in morning any thoughts on why it wont start first time after been standing overnight it runs just as well as b4 when temp comes up a little dnt know why it wont flash the codes as it did a few moths ago and i had to change knock sensor then it told me codes again few weeks later when i had to change lambda sensor but this time it doesnt flash when plugs are connected just stays on
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Originally Posted by kevin wrx
(Post 9668721)
ther is another way of fault code check and that is just connect the black wires and turn ignition till the check engin light comes on but dont start the car then check the fault codes,thatsthe way i check em and there is nothing wrong diong it the other way either.
There is only one method of checking stored fault codes (without using an external diagnostic computer), and that's via the black plugs on their own. As above, connecting green + black together initiates the ECU reset sequence. |
Originally Posted by b13bat
(Post 9668727)
Poor cold starting caused by Coolant Tempreture Sensor on the way out. Could also be the cause of the fans running and the constant CEL too.[/COLOR][/I][/B]
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Originally Posted by Splitpin
(Post 9668729)
What exactly is the "other way" you are referring to Kevin?
There is only one method of checking stored fault codes (without using an external diagnostic computer), and that's via the black plugs on their own. As above, connecting green + black together initiates the ECU reset sequence. |
hi all well i must fess up i have been trying to read faults wrong well anyway i have found fault 21 which i belive to be engine coolant temp sensor as you have mentioned now i belive this to be located below air inlet pipe on the block is this correct and how much of a job is it to do thx again you are all very helpfull
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That's more like it.
Yes, there are two coolant temp sensors on your model year of car - one feeds the needle in the instrument pack, and the other the ECU (which is the "bigger" one of the two). They're located next to each other, in the front edge of the coolant distributor main which runs across the top of the engine underneath the inlet manifold. Look behind the alternator and you'll see them sticking out. Clearly you'll need to (part-)drain the cooling system to change it - or prepare to get very wet! |
well thank you i shall tackle this problem on the weekend and give full service at the same time thnks again very helpful
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