Jump to content


VN V6 ECU Fault code 12... Help


  • Please log in to reply
19 replies to this topic

#1 _TRRANA_

_TRRANA_
  • Guests

Posted 16 December 2009 - 09:54 AM

Gday all.

Recently Ive purchased a VN Series 2 V6 exec for 4 slabs of xxxx Gold stubbies. The owner told me the car just suddenly stopped and has has been sitting in a barn for a couple of years.

Posted Image

Ive been trying to start it, its getting fuel and cranks over but there appears to be no spark at all, so id thought id check the ECU for some sort of diagnosis.

After checking the ECU im getting the code 12 which tells me the operating system is all ok, but clearly theres a problem.

My questions are....

1. Because ive put a new battery in, and the ECU has cleared itself of old codes, does the motor have to be running to report any new faults hence why im getting code 12?

2. Can the ECU give incorrect readings because maybe its the crank angle sensor?

3. If the coil pack is stuffed, ive been told the ECU wont report the fault is that true?

Im hopin to not spend any money (or very little) on this piece of crap! so i dont wana buy this and that for it if it doesnt end up starting.

Today im gonna get under the bonnet and check all my earths and clean all the plugs to see if that works.

Cheers.
Dorzy

#2 mr5000

mr5000

    chief break-everything

  • Members
  • PipPipPipPipPipPip
  • 3,449 posts
  • Location:melbourne
  • Car:77 lx 4door
  • Joined: 08-January 06

Posted 16 December 2009 - 10:17 AM

i do have a vn v6 manual floating around some where cant find it
at a guess just suddenly stopping id say replace the crank angle sensor unless all 3 coil packs died at the same time i dont think it would be them
check if ya getting fuel then check if ya getting spark
you probably wont have spark from the soundsof it so then just a process of elimination see whats getting power

#3 TerrA LX

TerrA LX

    Fulcrum Fixture

  • Members
  • PipPipPipPipPipPipPip
  • 14,241 posts
  • Location:Sid 'n' knee
  • Joined: 31-May 06

Posted 16 December 2009 - 10:52 AM

First I would check the connection between the module and the loom.

Does this car have the one piece coil pack and module or are the three coils separable?

To test for spark use a spare plug or take one out, plug a lead into it then earth the plug to the motor with a jumperlead etc and crnk the motor.

IMO get to the wreckers and pick up a cheap Coil module or if it is a keeper spend a few dollars and convert it to the three separate coil set up if it has the single pack.

#4 TerrA LX

TerrA LX

    Fulcrum Fixture

  • Members
  • PipPipPipPipPipPipPip
  • 14,241 posts
  • Location:Sid 'n' knee
  • Joined: 31-May 06

Posted 16 December 2009 - 11:00 AM

AFIK you should get Code 46 for the crank sensor while cranking if it fails.

#5 Potta

Potta

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 6,026 posts
  • Name:Craig
  • Location:Gozzy, WA
  • Car:LC GTR, LC 4 door
  • Joined: 01-May 09

Posted 16 December 2009 - 11:13 AM

We had a problem on our VS where it stopped firing on some cylinders.

Replaced the coil packs and still had a problem.

Ended up having to replace the bit that the coil packs sit on.

I'm pretty sure we got an error code though.

Good luck mate.

#6 TerrA LX

TerrA LX

    Fulcrum Fixture

  • Members
  • PipPipPipPipPipPipPip
  • 14,241 posts
  • Location:Sid 'n' knee
  • Joined: 31-May 06

Posted 16 December 2009 - 11:14 AM

Ended up having to replace the bit that the coil packs sit on.

I'm pretty sure we got an error code though.

Good luck mate.


That would be the Module. No error code AFAIK.

#7 _Woodsy_

_Woodsy_
  • Guests

Posted 16 December 2009 - 11:14 AM

u say there appears to be no spark but have u actually checked for it?.. My mums vectra shat its shorts yesterday and was doing the same thing as this VP.. Would crank and not fire. Ended up being the fuel pump.

#8 Potta

Potta

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 6,026 posts
  • Name:Craig
  • Location:Gozzy, WA
  • Car:LC GTR, LC 4 door
  • Joined: 01-May 09

Posted 16 December 2009 - 11:32 AM



Ended up having to replace the bit that the coil packs sit on.

I'm pretty sure we got an error code though.

Good luck mate.


That would be the Module. No error code AFAIK.


Yep, thats the one. You are probably right about the code. It had a problem with the transmission around the same time so that could be the code I was thinking of.

#9 Collo

Collo

    ( . Y . )

  • Members
  • PipPipPipPipPipPipPip
  • 114,647 posts
  • Location:Newcastle...Home of me.
  • Car:A Black POS
  • Joined: 29-February 08

Posted 16 December 2009 - 12:10 PM

AFIK you should get Code 46 for the crank sensor while cranking if it fails.


41 is crank angle sensor. 46 is Ignition module.

#10 mr5000

mr5000

    chief break-everything

  • Members
  • PipPipPipPipPipPip
  • 3,449 posts
  • Location:melbourne
  • Car:77 lx 4door
  • Joined: 08-January 06

Posted 16 December 2009 - 12:39 PM

i thought only the series one vns had the 3 built in and series 2 onwards had seperate

also a quick look at that pic i would say its a vp

#11 Collo

Collo

    ( . Y . )

  • Members
  • PipPipPipPipPipPipPip
  • 114,647 posts
  • Location:Newcastle...Home of me.
  • Car:A Black POS
  • Joined: 29-February 08

Posted 16 December 2009 - 01:15 PM

Yeah vp. Why didn't i notice that. :Headbang2:

#12 TerrA LX

TerrA LX

    Fulcrum Fixture

  • Members
  • PipPipPipPipPipPipPip
  • 14,241 posts
  • Location:Sid 'n' knee
  • Joined: 31-May 06

Posted 16 December 2009 - 01:17 PM


AFIK you should get Code 46 for the crank sensor while cranking if it fails.


41 is crank angle sensor. 46 is Ignition module.


Correct, Code 41 is CAS VN-VP, Code 46 is CAS VR on, sorry for the confusion.

AFAIK Module/coil etc do not send a signal to the ECU, when cranking, this is Code 12, as opposed to the motor running, which, if no faults persent, will show Code 12 aswell. Only things such as a faulty CAS will show on cranking or intermitant CAS will show Code 41 running.

Edited by TerrA LX, 16 December 2009 - 01:19 PM.


#13 rodomo

rodomo

    To advertise here, call 13TORANA

  • Members
  • PipPipPipPipPipPipPip
  • 17,999 posts
  • Name:R - O - B Dammit!
  • Location:Way out west of Melbourne Awstraylya
  • Joined: 10-December 05

Posted 16 December 2009 - 04:54 PM

Give the multi-pin plug at the D.F.I module a good wiggle while you crank it.

#14 _TRRANA_

_TRRANA_
  • Guests

Posted 17 December 2009 - 10:55 AM

Give the multi-pin plug at the D.F.I module a good wiggle while you crank it.


Gave it a wiggle and started straight away!!!! took it for a skid and it runs nicely!!!

Yeah vp. Why didn't i notice that. :Headbang2:

its an 89 VN dressed up as a VP :)

Thanks fellas for all your help, much appreciated!!! :)

#15 rodomo

rodomo

    To advertise here, call 13TORANA

  • Members
  • PipPipPipPipPipPipPip
  • 17,999 posts
  • Name:R - O - B Dammit!
  • Location:Way out west of Melbourne Awstraylya
  • Joined: 10-December 05

Posted 17 December 2009 - 10:58 AM

Great! :spoton:
Now, undo the little bolt, 7mm from memory, and clean the terminals in the plugs with a Co2 (i think thats what they call it) type of cleaner. Spray it in, assemble the plug, wiggle wiggle and repeat a few times. Lastly spray with a WD40 type of stuff, dry off excess and reassemble.

The little terminals corrode over time.

Also, check that the earth wire under the D.F.I module mount plate is clean and tight at it's connections.

1 slabs of xxxx Gold stubbies :)

Edited by rodomo, 17 December 2009 - 11:00 AM.


#16 _TRRANA_

_TRRANA_
  • Guests

Posted 17 December 2009 - 11:30 AM

Great! :spoton:
Now, undo the little bolt, 7mm from memory, and clean the terminals in the plugs with a Co2 (i think thats what they call it) type of cleaner. Spray it in, assemble the plug, wiggle wiggle and repeat a few times. Lastly spray with a WD40 type of stuff, dry off excess and reassemble.

The little terminals corrode over time.

Also, check that the earth wire under the D.F.I module mount plate is clean and tight at it's connections.

1 slabs of xxxx Gold stubbies :)


after i got it goen i pulled the plug out and inspected it and it was a tad dirty, and also filed the crap off both ends of the earth lead.

Yeah thanks mate i owe ya a few beers :spoton:

#17 TerrA LX

TerrA LX

    Fulcrum Fixture

  • Members
  • PipPipPipPipPipPipPip
  • 14,241 posts
  • Location:Sid 'n' knee
  • Joined: 31-May 06

Posted 17 December 2009 - 02:17 PM

First I would check the connection between the module and the loom.

Does...


Glad you got it sorted.

#18 rodomo

rodomo

    To advertise here, call 13TORANA

  • Members
  • PipPipPipPipPipPipPip
  • 17,999 posts
  • Name:R - O - B Dammit!
  • Location:Way out west of Melbourne Awstraylya
  • Joined: 10-December 05

Posted 17 December 2009 - 02:28 PM

Get Terry a slab.
I'll settle for a six pack. :)

#19 _TRRANA_

_TRRANA_
  • Guests

Posted 17 December 2009 - 11:15 PM


First I would check the connection between the module and the loom.

Does...


Glad you got it sorted.


Cheers too mate! (gotta habit of skimming too fast thru posts) :)

#20 Potta

Potta

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 6,026 posts
  • Name:Craig
  • Location:Gozzy, WA
  • Car:LC GTR, LC 4 door
  • Joined: 01-May 09

Posted 18 December 2009 - 06:15 PM

thats farkin awesome!!!

Makes it an awesome pickup!!




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users