Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Kevin Wood]

I'll have a look later and see if I can deduce that from the diag procedures in TIS.

[MaxV6]

i'd be eternally grateful old bean ......        (well, i am already, but it would more so even.....    )

[MaxV6]

James,  I think you may need to find some seasoning for your hat mate.

1) ecu failure is apparently common on this engine.  (just my luck)

2) having removed ecu, tested the circuits connected to Pin 29 on the multipin connector, as far as i can tell they're all intact....   and with ECU out, there's no link back to ground on the bit i could get to, 

i've seen a few posts here and there, from unknown, untrusted sources suggesting adding a direct earth on to that circuit,   .  which as far as i can tell means breaking open the multi pin connector (done it once to find pin 29) and splicing in a direct feed,  .....  very tight,  but i reckon just barely do-able.

or unwinding the loom wrap, finding the right piece of wire (plain brown,  not particularly unique....  ) and doing it there....

probably doing it as close to the ecu as possible .


however,  if they're wrong,  and that is a +5v feed,  i fail to see how it helps, and it may do more harm.

if i knew how the ecu feeds and returns to those sensors,  what criteria it is using to acquire data , and how they're configured,  i could decide between breaking in to circuit and adding a 5v supply, or piggy backing it on to another circuit, or adding an earth as rumour suggests.

or just forking out for an ecu and tech2 session.

[Kevin Wood]

I would be very surprised if pin 29 weren't a ground signal. Check the voltage there with a mutlimeter.

If the ground connection inside the ECU has just come adrift from that pin it's worth trying a bodge, IMHO.

For a quick test, just scotchlock it to one of the other brown wires from the ECU a little further up the loom.

[MaxV6]

now go wash your keyboard,  you naughty man,.... scotch lock......     EUUUUWWWWWWWW     

[Kevin Wood]

I would be very surprised if pin 29 weren't a ground signal. Check the voltage there with a mutlimeter.

If the ground connection inside the ECU has just come adrift from that pin it's worth trying a bodge, IMHO.

For a quick test, just scotchlock it to one of the other brown wires from the ECU a little further up the loom.

 

[MaxV6]

i figure i may as well.....     since it's currently buggered anyhow.....    if i do manage to make it worse....    it can;t be THAT much worse....   might drop a slow blow  fuse in line....  any idea of current load Kev?

[Radar]

Theres a relay box in the top right hand side of the engine - i will try to get a pic of what was done to pops astra for clarification.

[MaxV6]

that would be handy...  the more info the better.....   
was going to do it this morning,  but not well.....   dodgy pizza i suspect.... 
it's also pissing with rain.....    which makes me even less keen...

[Radar]

I'll try and do this weekend

[Brikhead]

Does the car still start?

[MaxV6]

yes,  runs lumpy as hell (IMHO bearing in mind i've not owned anything with less than 6 cylinders for 25 years) , then dies when it starts to get warm.

[Brikhead]

yes,  runs lumpy as hell (IMHO bearing in mind i've not owned anything with less than 6 cylinders for 25 years) , then dies when it starts to get warm.

...if it refuses to restart until it's cold then it sounds like an internal fault with the e.c.u.

Is the e.c.u. bolted to the cylinder head or on the inlet manifold? If so then get someone to attempt to restart the engine whilst you gently wiggle the wiring connectors at the e.c.u. If the engine does restart then this does point towards 'loose connections' within the e.c.u.

I know it's not the most technical way to diagnose the problem but I have seen this issue on several Vauxhalls that have the e.c.u. mounted on the engine.

[henryd]

yes,  runs lumpy as hell (IMHO bearing in mind i've not owned anything with less than 6 cylinders for 25 years) , then dies when it starts to get warm.

...if it refuses to restart until it's cold then it sounds like an internal fault with the e.c.u.

Is the e.c.u. bolted to the cylinder head or on the inlet manifold? If so then get someone to attempt to restart the engine whilst you gently wiggle the wiring connectors at the e.c.u. If the engine does restart then this does point towards 'loose connections' within the e.c.u.

I know it's not the most technical way to diagnose the problem but I have seen this issue on several Vauxhalls that have the e.c.u. mounted on the engine.

Agreed,I've seen the same,god knows why they bolt the ECU to a vibration and heat source

[MaxV6]

well,  i've connected pin 29  to earth, as well as earthing the ecu casing....    ran beautifully for about 5 minutes,  then  bingo....  back to square 1

same set of codes generated.....   

it restarts, but lumpy and unhappy....   mind you it's not that warm yet....