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Old 11-16-2005, 01:29 PM   #1
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Default How to tell a faulty ECU?

All sifus & simous,

Anyone know how to tell,diagnose or check if the ECU is spoiled or whatsoever??

Many thanks!
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Old 11-16-2005, 10:02 PM   #2
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we cant tell. ECU will tell us.

its an electrical item. most probably short circuit. a spoiled engine ECU means engine cant start. simple as that. at least if sensors not in working order, the CHECK ENGINE light will be on for reminder.
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Old 11-17-2005, 02:38 AM   #3
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or do u mean how to check if its a faulty ecu when u wanna purchase them??... how to test if its still working fine before installing...
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Old 11-17-2005, 03:06 AM   #4
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i think you need to plug it in to find out. other symptoms for faulty is ecu is , if you are running an auto box, jerkiness/difficulty shifting/gearbox suddenly jumps to N.
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Old 11-17-2005, 08:42 AM   #5
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Thanks to all bros who had comment...

zan : u're definately right, if the ECU is totally KO then of course it will tell us. But I would love to know how to tell if it's NOT totally faulty but part of it or going to KO?

SkYwAlKeR : at this moment, I would juz like to know whether my ECU is faulty. My car jerks for no apparent reason, after changing and checking all things such as; spark plugs, fuel pump, injectors, plug cable, throttle body....errrrm I thk it's abt that. But it still jerks?? Hai...tot of checking the ECU and fuel tank. Any idea? And would be glad if you could share how to check an ECU if I would hv to replace it. Thanks...

xerofighter : how abt manual? I'm driving manual. My car jerks as u've mentioned but no check lights on...what the heck! Cant seem to fix it. At the moment none of the mechanics are able to diagnose what's the problem.

Vacuum hose too is replaced! Any other things that would cause a car to jerk?? HELP!!! So damn frustrated to drive ever since, feel like juz taking a bus!
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Old 11-17-2005, 09:54 AM   #6
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jerk har.ur car will feel heavy or not har when tekan minyak? old car or new car. if new car go back service centre. if old car have ur gear box check.
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Old 11-17-2005, 10:07 AM   #7
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Bro, something like that though. It's heavier if air-cond is on. It will normally feel hard/jerking/hesitate to go during low rpms e.g. below 3k. Normally jerks as I accelerate from 1k~3k on each gear. Higher gear jerks lesser. Mine is a 6 yrs old car, considered old I thk, it's transplanted with MIVEC inside. Any idea what to check with the gearbox? Check the flywheel (didn't skim), clutch plate and clutch or check the gears area?? Thanks...

What actually the problem u're referring me to?

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Originally Posted by ryucky81
jerk har.ur car will feel heavy or not har when tekan minyak? old car or new car. if new car go back service centre. if old car have ur gear box check.
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Old 11-17-2005, 10:14 AM   #8
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Hm..did you check your fuel system? Try to have a look at it,injector,pump etc etc.
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Old 11-17-2005, 10:20 AM   #9
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escaflowne : Bro, thanks. But if you read my earlier postings I've done what you've posted but to no avail. Thanks anyway.
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Old 11-17-2005, 10:27 AM   #10
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Does a faulty distributor coil makes a car jerk??
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Old 11-17-2005, 10:36 AM   #11
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If it's the distributor it'll jerk at high rpms as well..
Check your gearbox and see... my fren had the same prob and it's the gearbox.. if it's not it could be ut throttle body area is leaking air...
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Old 11-17-2005, 10:45 AM   #12
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Bro, mine jerks only at low rpms (<3k). Can you please tell me what to check with the gearbox?? Thanks...

This is what ryucky81 said too but what to check for??
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Old 11-17-2005, 10:54 AM   #13
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check ur syncro
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Old 11-17-2005, 11:03 AM   #14
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I see...the syncro mesh. I didn't know it will make a car jerk...ok ok I'll get it check. But shit, I juz change the gear oil, using Q8. Damn...Thanks man...
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Old 11-17-2005, 12:09 PM   #15
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What car are you driving? i guess as what you said,need to check from the ECU.
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