Cranks but not starting 2012 4.4 tdv8

Graculus said:

Nope, it's shut off in the software of the ECM.

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Thanks. Going to plug back in...

welshd said:

As a highly qualified IRTEC road transport engineer, workshop foreman and with 40+ years (yes... old skool with an absolute hate of all modern electrics etc... I trained with spanners...) My expertise lies within the HGV and agricultural sectors though and very different to cars. I am fully aware of a structured and linear approach to these things. I am also fully aware of likely causes, which often saves time and money to try those options first. Admittedly my diagnostic kit for home is a generic one, and only throws up general codes. P0088 in this case. Many of the things you have asked for don't seem to exist with this vehicle... fuel reset for a start. (According to the manual, there is no fuel reset, and it should start automatically) Every thing that needs to be tested etc has been... electrical readings etc and all fine. All new parts are fitted correctly, and timed correctly. All are brand new and genuine parts.

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But it still doesn't go so you have missed something. Needs proper diagnostics IMO.

welshd said:

As a highly qualified IRTEC road transport engineer, workshop foreman and with 40+ years (yes... old skool with an absolute hate of all modern electrics etc... I trained with spanners...) My expertise lies within the HGV and agricultural sectors though and very different to cars. I am fully aware of a structured and linear approach to these things. I am also fully aware of likely causes, which often saves time and money to try those options first. Admittedly my diagnostic kit for home is a generic one, and only throws up general codes. P0088 in this case. Many of the things you have asked for don't seem to exist with this vehicle... fuel reset for a start. (According to the manual, there is no fuel reset, and it should start automatically) Every thing that needs to be tested etc has been... electrical readings etc and all fine. All new parts are fitted correctly, and timed correctly. All are brand new and genuine parts.

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Have you looked at what P0088-nn actually means? it's overpressure.
The LTB references P0088-17 specifically, which your generic code reader won't be able to pick up, and certainly won't be capable of the reset routine - if it's just a generic code reader.
The measurements certainly do exist, some have to be done manually with a voltmeter, some have to to be read as live values from the Engine Control Module.
I fail to see how a genuine HPFP you claim to have fitted is 'saving time & money' given the three-figure cost of just that item, the fuel pressure sensor is only available with the fuel rail, again, a significant cost.

Which manual are you referring to? the owners manual? The HP fuel pump lockout is cleared automatically when using the manufacturers diagnostics other systems, such as Autologic etc. have it as a separate routine.
I've given you the information - and asked for information back to progress the diagnostic path, which has seemed similar to how I'd imagine banging my head on a brick wall would be, so put your '40+ years with an absolute hate off all modern electrics etc.' to one side, go back to basics and have a read of the LTB I've provided.

I'll let someone else take over from here, Ive lost interest frankly.

Graculus said:

the fuel pressure sensor is only available with the fuel rail, again, a significant cost.

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Advanced factors list and sell the sensor separately. Thanks for your help so far.

Camshaft sensor?
Not sure about RR, but a dodgy one on a TD4 will allow cranking but no ignition.

Freddie17 said:

Camshaft sensor?
Not sure about RR, but a dodgy one on a TD4 will also low cranking but no ignition.

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Yep. That is on the list to look at too. As advised we are going to take the plunge and get a GAP IID tool. Have refrained before as often change our vehicles, and so our generic tool for all vehicles has always sufficed. However if can fix this issue may keep RR as its alright! Apart from not going!!! Also going to do the modification to the pressure sensor wiring harness. Won't cost us and rules it out.

Datatek said:

But it still doesn't go so you have missed something. Needs proper diagnostics IMO.

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Absolutely! I have missed something, and scratching my head as to what. Proper diagnostics will def help, and so going to invest in a GAP IID tool. My generic one is great, and very useful for giving an idea. TBH I change cars quite regularly and so never invested in a specific one. Our Merc ones and JD ones at work are fantastic. Have a step by step guide to what you are doing and everything. They are manufacturer supplied only. Quite like this RR, and this is the first major issue in 3 years. If can sort this will probably keep for a while yet. Missus likes it for towing her horses too. While waiting for tool to arrive will do the mod of the pressure sensor wiring harness, as that won't cost me and at least can rule out. Wondering on the CKP too, but going to wait for tool...

welshd said:

Yep. That is on the list to look at too. As advised we are going to take the plunge and get a GAP IID tool. Have refrained before as often change our vehicles, and so our generic tool for all vehicles has always sufficed. However if can fix this issue may keep RR as its alright! Apart from not going!!! Also going to do the modification to the pressure sensor wiring harness. Won't cost us and rules it out.

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Camshaft sensors don’t tend to throw a code unless they are FUBAR.
If their signal line is just ‘off’ on volts, it won’t start.
You can back-probe them to test.