Anyone help with a problem with my 2007 discovery 3 2.7
Lost all special programs and will not rev Iver 2000 rpm
Fault logged on gap iid is fuel pressure sensor tried live data
And it's showing 0.0 is the sensor faulty have no idea what the live data should tell.me thanks in advance
28th Dec 2021 12:47 pm
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
I dont think you can read the live data from the sensor.
Fuel pressure is 99410 kpa all other values are fine within limits and fault code was p0191-00 fuel rail pressure sensor range/performance
29th Dec 2021 2:22 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4669
You'd expect to see that figure at much higher rpm or when booting it. Check the plug wiring on the sensor is OK but I suspect it will merit deeper investigation.
Have a look at the "live values" for the three amigo's taken together. FRPS, VCV, and PCV referred to in my last post. The FRPS is rarely the cause of a problem on its own, though it can of course fail.yµ (idµ - eAµ) ψ=mψ
Member Since: 06 Mar 2017
Location: Lost
Posts: 4669
Sorry, I meant PCV, VCV, and "fuel pressure" (which is the FRPS signal). Forget about any readings from the FRPS itself other that fault codes which refer to it.
So you have PCV at 14%, VCV at 23% and fuel pressure at an eye watering 99410kPa all taken at idle?
It would be no harm at this point to have a look at the injector trim levels and see what the readings are there. Just in case there' something else amiss.
Beyond that, and in the absence of any further fault codes or diagnostic anomalies, you'd have to be moving in the direction of a new FRPS. A word of caution here though, Siemens say that this component must not be removed from the rail, and the complete fuel rail must be replaced. That said, it has been replaced by many on here, but with varying results. The critical thing here is getting the correct sensor!!! There are many similar sensors out there which have a varied list of vehicle applications, (Ford essentially) and not necessarily specific to the LR TDV6. The other pitfall here is that it could be the HPFP which is at fault even though you have no specific fault codes to suggest so. So thread carefully before you fire the parts cannon, as a mistake here will potentially be very hard on your pocket.
Personally I'd be digging further into the cabling to the sensor and checking the signal values at the pins before condemning the sensor, and as above the injector values. Repeated cycling of the ign and driving might throw up some further fault codes which will hopefully narrow down the problem.yµ (idµ - eAµ) ψ=mψ
Thank you for all your help I think I will get an auto electrician friend of mine to delve into it before I spend too much
29th Dec 2021 5:40 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4669
If you have a digital multi meter you can check the signals from the connector yourself and post them back here. You just want to eliminate any potential issue with either the connector or possible short between the cables.
It is a bit odd that you're only getting one fault code from the ECM given the operating conditions you reported. Was there anything else from the other control modules?
I would suggest your auto electrician would need to be familiar with these, if he is to be confident of any meaningful results for you.yµ (idµ - eAµ) ψ=mψ
I will check to see that was the only fault code linked to the engine and I will try a multimeter tomorrow I.assume I will get voltage on at least 1 or 2 pins ?
29th Dec 2021 8:14 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4669
Yes, one will be the base line voltage reference typically 4.9v, the others will be the PWM (signal) which is variable and lower than the baseline, the other I think is earth.yµ (idµ - eAµ) ψ=mψ
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