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Author Clearing ECU fault code / turning off ECU light
amyspud
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Registered: 6th Nov 05
Location: Hertfordshire
User status: Offline
30th Jun 07 at 16:07   View User's Profile U2U Member Reply With Quote


Also see my post earlier today


Once it's on and the ECU logs a fault - if you then change the faulty part does the light go off automatically or do you need to plug in a diagnostic tester and clear the code and swith light off? Can this be done by just disconnecting the battery?
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
30th Jun 07 at 16:22   View User's Profile U2U Member Reply With Quote

The light goes straight off.

And the fault will clear eventually.
Warren G
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Registered: 14th May 06
Location: Kent
User status: Offline
30th Jun 07 at 16:34   View User's Profile U2U Member Reply With Quote

not always 100% ture, sometimes you need to clear the code before the EML goes out
amyspud
Member

Registered: 6th Nov 05
Location: Hertfordshire
User status: Offline
30th Jun 07 at 17:29   View User's Profile U2U Member Reply With Quote

Can yo uclear it by disconnecting the battery for a period of time? OR do you need a diagnostic reader?
Vaux Lad
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Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
30th Jun 07 at 18:14   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by warren.g
not always 100% ture, sometimes you need to clear the code before the EML goes out

But on later systems you cant clear the code by disconnecting the battery.
Some say 30 ignition on and off's do it, but it doesn't on mine.

Apparently a set number of cold starts are needed without the fault occuring before the ecu clears it.
amyspud
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Registered: 6th Nov 05
Location: Hertfordshire
User status: Offline
30th Jun 07 at 19:44   View User's Profile U2U Member Reply With Quote

That 30 on/off - is that just turning the ignition on and off rather than starting the car 30 times?
amyspud
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Registered: 6th Nov 05
Location: Hertfordshire
User status: Offline
1st Jul 07 at 18:38   View User's Profile U2U Member Reply With Quote

Up to 26 tonight (starting the car from cold) and still the light is on
amyspud
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Registered: 6th Nov 05
Location: Hertfordshire
User status: Offline
2nd Jul 07 at 22:54   View User's Profile U2U Member Reply With Quote

Start / stop 35 times and the ECU light is still on - help....
amyspud
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Registered: 6th Nov 05
Location: Hertfordshire
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7th Jul 07 at 12:30   View User's Profile U2U Member Reply With Quote

Any new ideas chaps?
amyspud
Member

Registered: 6th Nov 05
Location: Hertfordshire
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12th Jul 07 at 16:40   View User's Profile U2U Member Reply With Quote

So - I've changed the EGR with an EGR that was 2nd hand but guaranteed to be working BUT ECU light is still on. Paid for the Tech 2 to be plugged in again to see if the fault had to be cleared through this (having been unable to clear it through >30 cold starts and having disconnected the battery several times and for several days) and..... the Tech 2 now reports "P1405 EGR Valve Feedback Incorrect".

The car passed the MOT with flying colours, drives beautifully, starts fiirst time, cruises, accelerates, idols perfectly, great fuel consumption but the ECU light is STILL on - any new ideas please?
Warren G
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Registered: 14th May 06
Location: Kent
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12th Jul 07 at 18:11   View User's Profile U2U Member Reply With Quote

have they cleared the code? is it still on?

faulty EGR?
amyspud
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Registered: 6th Nov 05
Location: Hertfordshire
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12th Jul 07 at 19:15   View User's Profile U2U Member Reply With Quote

When they clear the code the light goes out for 30 secs (or so) then code comes back and then light comes back on.

I changed the EGR for a 'guaranteed' second hand EGR.

Reports back :"P1405 EGR Valve Feedback Incorrect"
Warren G
Member

Registered: 14th May 06
Location: Kent
User status: Offline
12th Jul 07 at 19:30   View User's Profile U2U Member Reply With Quote

faulty EGR or possible wiring fault
amyspud
Member

Registered: 6th Nov 05
Location: Hertfordshire
User status: Offline
12th Jul 07 at 19:36   View User's Profile U2U Member Reply With Quote

but surely if the EGR was faulty the car would be playing up in some form or other - the car runs sweet, starting, accn, etc etc. Passed the MOT with flying colours including emmisions...

 
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