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Nissan Micra 1.2 CR12DE 2006 - Poor running, P0138 - Fixed #

Posted by Malcolm Tripp on November 26, 2012, 9:46 am

Year of Manufacture *: 2006
Engine Size and Code *: 1.2 CR12DE
( Optional ) Scanner Used: solus pro / pico
( Optional) Fault Codes: p 0138

Had this car in with poor running at light throttle
EML on scan revealed P0138 which on it's own I dont think would cause this issue.

Car has only done 12,000 miles

Scoped primary and got a bizarre pattern which seems to have the primary dwell period upside down ?

Scoped cam and crank at idle and it appears to be slightly out compared to a known good one, how much tolerance is there ?

Lambda bank 1 not moving from 0.4 volts until 1200rpm then switching normally

Any ideas appreciated

Re: Nissan Micra

Posted by James Eardley <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3143' width='330' height='300' border=0 style='border:none;'> on November 26, 2012, 10:43 am, in reply to "Nissan Micra "
James Eardley

Hi Malcolm

This is cam and crank sync from a 2003 CR10 DE

I am almost 100% sure they are the same.

Yours appears to be out.

HTH
James

Re: Nissan Micra

Posted by malcolm tripp <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5337' width='330' height='300' border=0 style='border:none;'> on November 26, 2012, 11:34 am, in reply to "Re: Nissan Micra "
Malcolm Tripp

James

Thanks for prompt reply

I am aware it's slightly out what I need to know is how far out can it be before problems arise ?

Re: Nissan Micra

Posted by aidan birley <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2879' width='330' height='300' border=0 style='border:none;'> on November 26, 2012, 1:48 pm, in reply to "Re: Nissan Micra "

Hi

I would check that fault code out, micras had an issue with rear sensors failing (high signal voltage) and effecting up stream sensor & so giving running issues

cheers Aidan

Re: Nissan Micra

Posted by Carl Ford <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1822' width='330' height='300' border=0 style='border:none;'> on November 27, 2012, 3:11 pm, in reply to "Re: Nissan Micra "
Carl Ford

Hi malcom

Your dwell isn't upside down, I believe what you are seeing is a switch input to the coil from the ECU (square wave) as the transistor is inside the COP.

Never scoped one on a micra but you seem to be picking up noise from the spark (shouldn't be an issue), I haven't seen that on the VAG ones I have scoped.

HTH
Carl

Re: Nissan Micra

Posted by James Eardley <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3143' width='330' height='300' border=0 style='border:none;'> on November 27, 2012, 7:29 pm, in reply to "Re: Nissan Micra "
James Eardley

Hi Malcolm

Sorry about the confusion with what you were asking

I just skimmed over your post and thought I had sent the relevant info that might help.

I agree with Carl regarding what you are possibly seeing in the primary trace. But, I have noticed that your voltage setting may be also screwing with your waveform.

I would not advise using the auto range.

Also,
In your Cam and Crank capture the timebase you are using and the sample rate you are using means your sample interval will be around 200Us which is probably a bit slow for catching fast frequency signals. There is a good chance you will miss vital information or glitches.

I hope this may help you in the future

Cheers
James

Fixed #

Posted by Malcolm Tripp on November 29, 2012, 5:54 pm, in reply to "Re: Nissan Micra "
Message modified by board administrator December 1, 2012, 1:04 pm

Finally got to the bottom of this, provided a supplementary earth to front lambda then switching normally, scoped post cat sensor only to find 20v being produced !!!

Replaced post cat sensor and now all is well I know they share an earth but never seen that sort of voltage from a lambda sensor.

Well done Aidan and thank you for replies, did not have time to check coil traces but as it's running well they must be OK.

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