New Territory engine in D3, Engine System Fault, please help

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Originally Posted by winaje

I have checked the voltage at the wires to this sensor, and it's 4.95v with the ignition turned on, and it does not change while cranking. According to the info, the voltage applied varies between 0 and 12v.

Does anyone know of a way to test this PCV? It's just a solenoid, can I safely apply 12v directly to it and see if the car starts?

Thanks again.

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The PCV signal will be pwm at around 40% duty cycle for your meter to show around 5V, with the 40% duty cycle partly closing the valve to provide some rail pressure as the valve is open when without power. Applying 12V to obtain full pump pressure should not be required and may subject the rail and injectors to excessive pressure.

You can check the solenoid's coil for continuity but if you can hear the valve click (which it probably wont without full 12V applied) when the ignition is first switched on then its working.

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Originally Posted by Graeme

The PCV signal will be pwm at around 40% duty cycle for your meter to show around 5V, with the 40% duty cycle partly closing the valve to provide some rail pressure as the valve is open when without power. Applying 12V to obtain full pump pressure should not be required and may subject the rail and injectors to excessive pressure.

You can check the solenoid's coil for continuity but if you can hear the valve click (which it probably wont without full 12V applied) when the ignition is first switched on then its working.

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Thanks Graeme. I see 5v at the wires from the loom. I applied 12v briefly (10 seconds) and heard the solenoid click, then immediately hit the starter.

THE ENGINE STARTED IMMEDIATELY YAAAAYYYYYYYYYY :D:D:D:D:D:D:D

I'll go and reconnect the loom to the PCV and see what happens...

OK, when reconnecting the loom (wires either way) and confirming that I get the 5v at the positive wire before connecting it, I can't get it to start...??? So I know exactly where the problem is, but not the exact cause of the problem. On the plus side, the engine sounds smooth, quiet and sweet...

Can anyone advise of a reason that the ECM is not providing enough voltage to "actuate" the PCV, thereby allowing the vehicle to start?

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Originally Posted by winaje

OK, update: have tested fuel pressure at the schrader valve. It's supposed to be .6 bar, but it tests at .35bar. Have removed and refitted the new Bearmach diesel filter, it was full of diesel. Have bled the low pressure pipe from just before the schrader housing. Have used a bit of Aerostart, and the engine fires on the Aerostart. BUT it doesn't fire on diesel. So it seems probable to me that the problem is fuel delivery related. Ive been reading a document from disco3 that talks about the pressure control valve on the HPFP. It says: "In the event of a total failure of the fuel rail pressure control valve, the engine will not start." I have checked the voltage at the wires to this sensor, and it's 4.95v with the ignition turned on, and it does not change while cranking. According to the info, the voltage applied varies between 0 and 12v.

Does anyone know of a way to test this PCV? It's just a solenoid, can I safely apply 12v directly to it and see if the car starts?

Thanks again.

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Sounds like you installed a cesna engine instead of the territory ;)

May have just had a bit of crap caught in it,see how you go when its wired correctly.
Andrew

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Originally Posted by LandyAndy

May have just had a bit of crap caught in it,see how you go when its wired correctly.
Andrew

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Hi Andy, as I edited above, it doesn't start when the PCV is connected to the loom. I've tried the wires connected both ways too...

Is the PCV the Territory or Disco item,if its the territory its a possability it runs on a different voltage.Is it possible to swap the parts out or is that another body off procedure?????
Andrew

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Originally Posted by LandyAndy

Is the PCV the Territory or Disco item,if its the territory its a possability it runs on a different voltage.Is it possible to swap the parts out or is that another body off procedure?????
Andrew

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PCV is from the territory. I've had a guy I know who has a D3 check the input voltage to the PCV on his D3. He has 13.07v at the plug. He's also doing a territory engine swap, has his donor territory available. I can get him to test the voltage to the territory PCV if you think it's worth it?

Thanks

Can you get your hands on either a multi-meter that shows pwm or an oscilloscope so that you can determine for sure that you are getting an analogue signal or a pwm signal and if pwm, the voltage? A voltmeter function cannot show you the specifics.

The pcv is ecm-controlled so you should be using the LR version unless you can confirm they are identical.

Anyway, you're making progress.

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Originally Posted by Graeme

Can you get your hands on either a multi-meter that shows pwm or an oscilloscope so that you can determine for sure that you are getting an analogue signal or a pwm signal and if pwm, the voltage? A voltmeter function cannot show you the specifics.

The pcv is ecm-controlled so you should be using the LR version unless you can confirm they are identical.

Anyway, you're making progress.

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Nooo, don't tell me that! lol. The PCV is integral to the HPFP and evidently can't be swapped out. Will see what I can do about finding out the info you mentioned.

Does the Volume Control Valve seem to be operating? Its also a pwm-operated valve controlled by the ecm and if it isn't closing sufficiently then there wont be proper output from the pump for the pcv to appear to work properly. That there's enough fuel pressure with 12V applied to the pcv for the engine to run could be because the vcv is allowing too much LP fuel to pass directly to the return line for the start-up pcv opening duty cycle to build enough pressure. Can you confirm that the vcv is being powered?

BTW, a solenoid that's operated by a 12V pwm signal with varying duty cycle to vary to flow usually gets around 85% duty cycle to open fully, so 100%, ie constant 12V, should not be detrimental to the solenoid.