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[stevief]

Just had the faults read with Tech 2.

P0725 Engine-Speed Sensor Input Circuit no Signal From Control Unit

And

P1335 Injection Pump: no Engine Speed Input Signal from Control Unit

Worst case scenario is the pump control module which is built into the pump prices so far range from £500 to £2000 depending on who you speak to.

Cheaper alternative is the crank sensor prices still to be checked and the cheapest solution may be a fault in the chip unit which plugs in between the pump and the ECU.

Forward plan given that the car has not had any faults today is to check it again as it stands, if the fault comes up then pull the chip, if fault still there change crank sensor and if that doesn't work then a pump is the only alternative.

I was hoping for it to be temperature related given that it is warmer outside than it has been since the fault started and no faults seen today but that is two scans in two days with the same fault showing so I guess I need to accept it for what it is.

Next question - any ideas where the crank sensor is located? Dreading the answers already

Cheers,

Steve  

[Boiler Man]

Sorry Steve.

Cant help you with where the crank sensor is,

Hopefully one of the more experience engine guys can.

Have you decided what to do? :-/

[stevief]

My plans for fault finding have hit a stumbling block, since Friday afternoon when it flickered once on the way home there have been no further problems, so far that is seven journeys from cold. Although this is good news for the time being I can't get any fault finding done unless there is a fault to find.

I can only put it down to the difference in the outside temperature at the moment as we have had a bit of a warm spell (above 5 degrees ) so I'll need to wait until the temperature drops again to see if it makes any difference.

If it starts again the chip is out first followed by a crank sensor then if the same fault shows it will be the pump I guess as it all points to the engine speed pick up at the pump. I did find some similar symptoms discussed on Vectras with the 2.0 DTI which was the crank sensor so it makes sense to start there.

As to finding the sensor's location I think I will have to buy a Vectra manual just to get some engine information :-/.

One thing I need to look at further is the oil in the intake from the breather system as it does not sit well with me having oil vapour clagging everything up and I dread to think what state the intercooler is in. Picked up a magazine at the weekend with a Larkspeed supplement and I see that E_tech are doing catch cans for around the £30 so it may be worth trying although I'm not sure if it will work with the turbo pulling air in as it may stop the catcher from working. The only real downside would be having to empty the catcher as it doesn't back feed into the block but I'm under the bonnet often enough anyway.

All in all a bit hacked off at not finding the fault because if it happens again it will probably be a total failure but at least I'm only £35 down for scans rather than rushing out and changing the pump which it may not be anyway. Any further updates I'll let you know.

Steve  

[stevief]

Typical, just when you think all is okay.

After 10 days of no indication of a fault the problem came back this morning on the way into work. The only differences today was that the outside temperature was only 1.5 degrees whereas over the last 10 days it has never been below 7 degrees and the rev counter was bouncing between 500 and 800 RPM rather than zeroing.

Engine temperature was around the 60 degree mark when the problem showed itself briefly this morning so the original engine temperature indications were probably just coincidental.

Any ideas as to why the cold would stop the ECU and pump getting an engine speed indication and also where the crank sensor is?

Steve

[Boiler Man]

Hi Steve

No Answer yet on your sensor?

I think the forum is getting that busy these days, people are missing questions that can help other members.

Try starting a new thread with where is the crank sensor.

It might get spotted easier.

Just a suggestion good luck hope you get it sorted