really apprieciate the input guys,
green would colour correspond to it being hall wire but when i set base timing i disconnected both as i wasn`t sure which colour was the correct one, that said i got the desired result in a fast idle ect and the timing and co and idle adjusted with out ecu override. it was only then i found it run well at idle. obviously temp 2 sender fault would give v rich readings but would disconnecting the temp 2 wire only result in the engine not being able to rev from idle. i have no idea. i measured temp 2 sender and resistance was correct at the switch, not to say its correct at the ecu though. i think plan tomorrow will be to check out the oxy sender wire first if that proves to be ok " "Balls"" i`ll do a quick check to see if that grey wire goes to the temp 2 sender then i`ll head in to the ecu and measure and record some pin data. i think i have enough data to be able to prove i`m a big enough pillock to warrant running a diesel.
it`s got to the stage now i`m laughing about it so my manic depression not`s so bad.
normally you only disconnect temp2 to set ignition timing (temp 2 switches off ECU advance of timing - hence won't rev under load cos no advance) and only disconnect idle stab (no hall signal so no feedback) when doing idle speed and co, so if you did co and idle with both temp 2 disconnected and idle stab disconnected then adding temp 2 probably doesn't change it much cos idle speed and or co are really set way too high so once the idle satbiliser tries to manage things it's already out of it's adjustment range
Try setting co and idle speed with just green and lambda disconnected see if it's different to the setting you have now
lack of rev from idle (not under load) if all else good says no afm signal or not being picked up vanagon syndrome style
well went straight to the lambda signal wire and tested for an earth. the inner core of the wire was indeed earth. gave it a little wiggle and the earth became intermittant. disconnected the ecu and the result was the same. very carefull inspection revieled the shrouding wire was coming in to contact with the inner wire. once the shrouding was turned back the wire lost its earth so a little tidying and some heatshrink and the connecter was good to go.
plugged everything back together and the van run perfect straight away. I AM 1 HAPPY BUNNY. saved me loads of time with pin data so a big thank to all.
hi.
sorry to drag up the old thread, but i just wondered if any MV experts would be so kind as to have a look at the thread i started over on brickyard related to engine bay wiring...
trying to identify some rouge wires in my engine bay.
I'm not registered at BW and not going to bother today, so one of your answers is here:
Your green/white wire was correctly identified by one poster as leading to the idle speed control unit. He's right, but has no idea why. I guess none of you guys has ever seen a factory air conditioning system; it's to signal the ISCU to compensate when the AC compressor cycles. In your application it would be left disconnected.
thanks for the reply tencent.
that makes perfect sense as the van had a partially complete AC fitted when I came into possession of it.
is it possible that plugging the wires together could have done any damage?
over the last few days the engine has been cutting out seemingly at random...
I thought it was just when I was down shifting or had my foot off the gas, but today it cut out whilst on the motorway at approximately 65mph...
that makes perfect sense as the van had a partially complete AC fitted when I came into possession of it.
It's generally there in every wiring harness regardless. At least over here they are.
is it possible that plugging the wires together could have done any damage?
Doubt it. I don't know what your other mystery wire is (because I haven't really looked at it), but odds are it either goes to ground (if it's brown with a stripe it probably does) or is hot under certain circumstances. The green/white wire would receive power directly from the AC clucth power, so if you powered that inadvertently the ISCU wouldn't be damaged. And, the green/white wire sees a path to ground when unpowered thru the AC clutch's solenoid winding, so it normally sees ground. So in either case, the ISCU would be exposed to conditions on that wire that it normally does, therefore it's unlikely any damage could have been done.
