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Author ECU light problems on my XE
jamesvalver
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Registered: 21st Feb 03
Location: Bury St Edmunds, Suffolk
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29th Oct 06 at 21:28   View User's Profile U2U Member Reply With Quote
how can i connect up my diagnosis port on my dash to the engine? on the way home from the rolling road yesterday my ecu light came on a few times then sayed off, but today on the way home this evening, my engine light came on a few times then it just stayed on, but the car doesnt run any different to normal????

can anyone help?
lee mitchell
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Registered: 26th Jan 01
Location: kent...drive's: eveyones conversion cars hard lol
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29th Oct 06 at 21:35   View User's Profile U2U Member Reply With Quote
what loom is ur car running?
jamesvalver
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29th Oct 06 at 21:56   View User's Profile U2U Member Reply With Quote
not sure as it was cossvaux that fitted the engine. it was a 1.0 12v
lee mitchell
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Location: kent...drive's: eveyones conversion cars hard lol
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30th Oct 06 at 07:42   View User's Profile U2U Member Reply With Quote
thats why it aint wired up then as the 1.0 is harder to wire up. i dont know anyone thats actually done it
willay
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30th Oct 06 at 07:55   View Garage View User's Profile U2U Member Reply With Quote
jamesvalver
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30th Oct 06 at 17:48   View User's Profile U2U Member Reply With Quote
fook. is there any way the ecu can be read without it being in a car then?
lee mitchell
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Location: kent...drive's: eveyones conversion cars hard lol
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30th Oct 06 at 19:21   View User's Profile U2U Member Reply With Quote
brown blue is the light so will either be the brown/white or brown/yellow
jamesvalver
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30th Oct 06 at 19:27   View User's Profile U2U Member Reply With Quote
hmm... will attempt that and if it works ill get a vid of what the lights doing
jamesvalver
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30th Oct 06 at 20:21   View User's Profile U2U Member Reply With Quote
i found two plugs joined to gether with some of the wires cut so i earthed the brown/yellow wire and it flashed something up on the dash.

this is the results (i have no idea what any of it means)

http://www.youtube.com/watch?v=91q3HHF8fqc
Dave A
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Registered: 10th Dec 03
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30th Oct 06 at 20:27   View User's Profile U2U Member Reply With Quote
65 Carbon Monoxide (CO) potentiometer Low voltage

31 Engine RPM signal (crankshaft sensor) No signal

31 is probably wrong because it wouldnt start if there wasnt a crank signal.
Dave A
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30th Oct 06 at 20:31   View User's Profile U2U Member Reply With Quote
65 is the idle mixture screw on the side of the airflow meter
jamesvalver
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30th Oct 06 at 20:32   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Dave A
65 Carbon Monoxide (CO) potentiometer Low voltage

31 Engine RPM signal (crankshaft sensor) No signal



65 - i have no idea what that means (quite bad seeing as im a mechanic at mazda)

31 - i wonder if it missed a beat on start up?
Dave A
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30th Oct 06 at 20:34   View User's Profile U2U Member Reply With Quote
do you have a lambda sensor in the exhaust?
jamesvalver
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30th Oct 06 at 20:37   View User's Profile U2U Member Reply With Quote
yeh
Dave A
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30th Oct 06 at 20:41   View User's Profile U2U Member Reply With Quote
its possible that you dont have a screw on the afm then. sometimes turning it 1/4 a turn can stop the light coming on. has the airfilter been messed with lately?
jamesvalver
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30th Oct 06 at 21:05   View User's Profile U2U Member Reply With Quote
not as far as i know. might of been dislodged on the rolling road. will try to get hold of another AFM n try it
Dave A
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30th Oct 06 at 21:06   View User's Profile U2U Member Reply With Quote
theres 2 types of afm. one has 4 pins, the other has 5. if you have a lambda you need the one with 4.
jamesvalver
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30th Oct 06 at 21:09   View User's Profile U2U Member Reply With Quote
cheers, my mates got a calibra 16v so ill try one of that!
lee mitchell
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Registered: 26th Jan 01
Location: kent...drive's: eveyones conversion cars hard lol
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30th Oct 06 at 21:09   View User's Profile U2U Member Reply With Quote
31 will be up if u didnt have the engine running when u done the test
jamesvalver
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30th Oct 06 at 21:32   View User's Profile U2U Member Reply With Quote
that'll be why then lee. cheers!
Stoneyginger
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Registered: 25th Jan 01
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31st Oct 06 at 14:42   View Garage View User's Profile U2U Member Reply With Quote
was the car running when you did that test as you will get 31 when the car is not on
Stoneyginger
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31st Oct 06 at 14:43   View Garage View User's Profile U2U Member Reply With Quote
just saw previous post
jamesvalver
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31st Oct 06 at 20:29   View User's Profile U2U Member Reply With Quote
cheers guys. i found a brass coloured flat head screw next to the wiring plug on the AFM so i turned it 1/4 - 1/2 a turn to the right and took it for a short drive. the ecu light stayed off this time where as it used to come on by just starting the car.

will keep an eye on it over the next couple of days but its looking good!!
Dave A
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1st Nov 06 at 09:11   View User's Profile U2U Member Reply With Quote
jamesvalver
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1st Nov 06 at 23:26   View User's Profile U2U Member Reply With Quote
its come on again twice tonight when accelerating but gone off again and hasnt come back on yet.

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