ICV is "dead"

9th November 2010, 09:40

Hello,

I´d appreciate help with my final problem. Nowadays my saxo 1.6 16V is after complex service, headgasket, cylinder head and many other things are repaired, or new.

But, there is still one big problem with my ICV. I already buy new one, but he thin is, when I start the engine, there is no impulse to the ICV. ICV itself not even move. it seems like the wire is dead.
Diagnostic tools says, that here is some kind of electrical failure /short circiut/. Som we decided, to get from somewhere schemes for ECU. but I cant find any.

maybe problem is caused by engine swap, where I change 2000 16V fo 2002 16V. but everything else is perfectly working..

so the question is, can you help me with providing some electrical or ECU schemes, or can you state your opinion, maybe some hints?

THANK YOU VERY MUCH IN ADVANCE

9th November 2010, 19:58

Try doing a continuity test on the sensor cable find where it starts and where it ends then see if you get anything. If not then you will most probably have either a break in the wiring or the insulation may have been chafed and it is causing a short circuit.

9th November 2010, 21:46

Doesnt the haynes manual have the wiring diagram for this? Also is the cable routed through a relay as if the relay if fooked it may not be sending the right signal.

9th November 2010, 22:35

thanks for hint, i´ll look in haynes. my mechanic thought, that there is sth wrong with wires, but he´ll need schemes for electrical wiring. haynes is good start.

tmrw we´re going to measure those wires, so hopefuly we´ll find something...

i´ll let you know.....

btw: it is really annoying, to have the ICV off, dont have any troubles with idling at all, we fix the valve at position, where i just have som troubles with cold starts, sometimes the revs drops. but the fuel consuption is unbelievable

and also, i can hear, that the engine is trying to work stable, but it cant due to ICV...

9th November 2010, 22:43

Different wiring looms, was it all changed over back when you changed the engine? all the sensors etc? Because a 2000 VTS Engine is a Single Plug ECU plug but with a Larger Multiplug underneath the Passenger side Headlight, where as the 2002 Engine is a 3 Plug ECU with the larger multiplug under the light?.. Just a guess.

9th November 2010, 23:10

right guess. my previous "lazy bastard mechanic" completed engine swap like this: he changed engines, necessary sensors and that´s it. basically i´m now running 2002 engine on single plug ECU. diagnostic tools are completely compatible with this setup.

as I mentioned, there allways came ICV error via diag. so, I think, I need to look and search for particular failure.... I really don´t like wiring problems

but that car is still worth of it...

9th November 2010, 23:20

All 4 wires of the ICV goto the ecu so check the continuity. Its a steppermotor and when you turn the ignition on it should calibrate by winding all the way out (if its out of the tb it will pop the end off and fire it across the workshop!). If the icv is known good, the wires are tested ok then its probably an ecu fault.

If the icv isnt a genuine magnetti one then bin it, it was probably broken before it got on the boat leaving china.

10th November 2010, 10:16

i think, that mentioned 4 wires are these:

3rd on the right side is an ICV. we need to check those for continuity.
ICV is genuine Magnetti, so there wont be a problem. maybe the original one is also still functional, but as you say, it should calibrate. after turning on ignition, ICV is completely dead... so the major problem will be elswhere that in the ICV body.

:ryanmt: appreciate your help, but i cannot correctly get the meaning of this sentence "(if its out of the tb it will pop the end off and fire it across the workshop!)"
problem is due to my english level

thanks everybody

12th November 2010, 00:50

still nothing. my mechanic is busy with everythig else

9th February 2011, 08:28

Hi,

after a while, we yesterday chcecked the wires with brand new ICV. no success. all wires seem ok, but ICV remains dead.

as you wrote, there also should be faulty relay, but do not now which one and another thing - faulty ECU. any guess how to progress... thanks so much

10th February 2011, 19:35

the icv doesnt go to a relay, just to the ecu as far as im aware so dont bother looking at ECU's.

Did you do the multimeter check? I have the same problem as you but ive not done the check to see if the icv actually moves in and out.

The sentence you didnt understand means be careful as the icv may pop the end off when you power it up and its not inside the throttle body so it will shoot off!

Il see if I can help you with this if I ever solve the same issue on mine!

19th February 2011, 17:43

Lippy:
we´ve done multimeter check and there is no short circuit. and the ICV do not move at all. not even calibrating. that´s why i do not know, what to do next. I already tried 3 brand new ones, genuine Magneti, but no luck.

so for now I ´m looking, how to disable imobiliser on older type (with keybord), just to check, if another singleplug ECU will help... i´m looking forward to it. fingers crossed

19th February 2011, 22:10

research it but I think if you have the engine running and unplug the immobiliser then it does what your after