P2288 Injector control pressure too high

[Sable]

Good Day Everyone,
First post here. We farm in Malawi, Central Africa. We have a 2006 Land Rover Discovery 3 TDV6. A couple of months ago we began to get engine faults with the vehicle starting to run very lumpy and going into limp mode. I got an Icarsoft LR2 tester sent up from South Africa and found 3 bad injectors. Replaced these but am now getting a P2288 (Injector control pressure too high) fault code as soon as engine starts. Can clear it but it returns immediately and special programs off and into limp mode. Injector values all close to 1000kpa which is good.

However Fuel pressure sitting at 25-35000kpa, the Pressure control valve reads 0% and the Volume control valve reads 23,68%.

If I unplug the Fuel rail pressure sensor, fuel pressure reads 179990kpa, PCV reads 16.13% and the VCV reads 25,41%. Vehicle sounds and runs fine, but now throws a P0193 (Fuel rail pressure sensor high input). If I plug the sensor back in, vehicle stutters briefly, PCV drops to 0% and it throws the P2288 code again.

So far, I have changed oil plus oil filter, changed fuel filter and made sure the four connectors go to right positions. Tried blowing out the fuel lines, doesn’t seem to be a block or kink in pipes. Have swapped batteries, checked earth wires. I have read that the Fuel Rail Pressure sensor can cause issues, as well as the connector for these sensors and can throw false readings. The FRP sensor on these early LR3’s sits at the back of the engine, not at the front of the fuel pressure rail at front passenger side. Am thinking my next effort will be to change the sensor and maybe the connector. Any other suggestions before we move onto the more expensive things like HPFP etc as all these parts are ordered from South Africa at great expense. I would really appreciate any help as we are on our own basically in Malawi as far as backup goes. Cheers and thanks

[PerthDisco]

Good Day Everyone,
First post here. We farm in Malawi, Central Africa. We have a 2006 Land Rover Discovery 3 TDV6. A couple of months ago we began to get engine faults with the vehicle starting to run very lumpy and going into limp mode. I got an Icarsoft LR2 tester sent up from South Africa and found 3 bad injectors. Replaced these but am now getting a P2288 (Injector control pressure too high) fault code as soon as engine starts. Can clear it but it returns immediately and special programs off and into limp mode. Injector values all close to 1000kpa which is good.

However Fuel pressure sitting at 25-35000kpa, the Pressure control valve reads 0% and the Volume control valve reads 23,68%.

If I unplug the Fuel rail pressure sensor, fuel pressure reads 179990kpa, PCV reads 16.13% and the VCV reads 25,41%. Vehicle sounds and runs fine, but now throws a P0193 (Fuel rail pressure sensor high input). If I plug the sensor back in, vehicle stutters briefly, PCV drops to 0% and it throws the P2288 code again.

So far, I have changed oil plus oil filter, changed fuel filter and made sure the four connectors go to right positions. Tried blowing out the fuel lines, doesn’t seem to be a block or kink in pipes. Have swapped batteries, checked earth wires. I have read that the Fuel Rail Pressure sensor can cause issues, as well as the connector for these sensors and can throw false readings. The FRP sensor on these early LR3’s sits at the back of the engine, not at the front of the fuel pressure rail at front passenger side. Am thinking my next effort will be to change the sensor and maybe the connector. Any other suggestions before we move onto the more expensive things like HPFP etc as all these parts are ordered from South Africa at great expense. I would really appreciate any help as we are on our own basically in Malawi as far as backup goes. Cheers and thanks

Yes that’s another hpfp failing code but yours is the earlier EU3 version hpfp. Don’t hear so much issues on these but getting to be 20 years old now.

Without the proper diagnostic tool and heaps of time to monitor operation and the exact moment of failure (which can disappear for months) you are always just guessing.

[loanrangie]

Welcome, lovely country Malawi. Spent some time at Cape Maclear diving and camping by the lake, as PD said it does sound like a failing high pressure fuel pump.
Your approach is sound with what you have done so far with diagnostics.

[veebs]

I know nothing of this, however if the engine sounds and runs fine without the sensor, but struggles once you plug it in, I would certainly suspect the sensor too...

There may be someone here that has a clever way to change it without needing to go too invasive?

[shanegtr]

I've had P2288 fault several times over the years. In every case changing the fuel filter has sorted it - sometimes not straight away either! The fault is from a restriction to the injector return fuel flow back to the tank. Since you've changed injectors its possible that you have introduced some dirt particles into the system.

[BradC]

When you unplug the sensor the ECU is using an assumed and calculated "limp mode" value which will get you home and you see that with the VCV & PCV values. It does sound like the sensor is a problem and perhaps it's reporting a value much higher than is real, so the ECU is winding the PCV closed to try and drop the pressure.

I agree with your first port of call being the sensor and/or connector. I'd check both sensor supply rails (GND & +VE). Pins 2 & 3 on the wiring diagram. If the sensor had a bad ground it's going to report a high voltage, and vice versa for the +ve supply. Sounds like it's a bugger to get to on the EU3 which isn't going to make life easier.

If you are watching the iiD, does it indicate rail pressure with the ignition on and before you start it? Can you graph the rail pressure from ignition on to running? Does the values look plausible?

If the sensor or wiring are problematic it should show up before the engine is even running.

[Jeffoir]

Welcome Sable.
I simply wish to add words of encouragement.
once again, this group continues to impress with superb mechanical and technical expertise.
In addition, the generosity with which they engage and support is a hallmark of the AULRO Forum.
I do hope you find resolution soon Sable. You may be isolated there in Malawi, but you are not alone.
best wishes, Jeffoir.

[discorevy]

Good Day Everyone,
First post here. We farm in Malawi, Central Africa. We have a 2006 Land Rover Discovery 3 TDV6. A couple of months ago we began to get engine faults with the vehicle starting to run very lumpy and going into limp mode. I got an Icarsoft LR2 tester sent up from South Africa and found 3 bad injectors. Replaced these but am now getting a P2288 (Injector control pressure too high) fault code as soon as engine starts. Can clear it but it returns immediately and special programs off and into limp mode. Injector values all close to 1000kpa which is good.

However Fuel pressure sitting at 25-35000kpa, the Pressure control valve reads 0% and the Volume control valve reads 23,68%.

If I unplug the Fuel rail pressure sensor, fuel pressure reads 179990kpa, PCV reads 16.13% and the VCV reads 25,41%. Vehicle sounds and runs fine, but now throws a P0193 (Fuel rail pressure sensor high input). If I plug the sensor back in, vehicle stutters briefly, PCV drops to 0% and it throws the P2288 code again.

So far, I have changed oil plus oil filter, changed fuel filter and made sure the four connectors go to right positions. Tried blowing out the fuel lines, doesn’t seem to be a block or kink in pipes. Have swapped batteries, checked earth wires. I have read that the Fuel Rail Pressure sensor can cause issues, as well as the connector for these sensors and can throw false readings. The FRP sensor on these early LR3’s sits at the back of the engine, not at the front of the fuel pressure rail at front passenger side. Am thinking my next effort will be to change the sensor and maybe the connector. Any other suggestions before we move onto the more expensive things like HPFP etc as all these parts are ordered from South Africa at great expense. I would really appreciate any help as we are on our own basically in Malawi as far as backup goes. Cheers and thanks

Hi

Just check engine oil temp sensor in live values if your tester will allow, as this can give a lumpy idle with seemingly unrelated codes on EU3 models, usually under reading temps by a large margin if faulty.

Just to rule it out if nothing else.

[Sable]

Welcome, lovely country Malawi. Spent some time at Cape Maclear diving and camping by the lake, as PD said it does sound like a failing high pressure fuel pump.
Your approach is sound with what you have done so far with diagnostics.

Thanks Loanrangie, you are welcome on the farm anytime should you return, Could you bring a HPFP with you?

[Sable]

I've had P2288 fault several times over the years. In every case changing the fuel filter has sorted it - sometimes not straight away either! The fault is from a restriction to the injector return fuel flow back to the tank. Since you've changed injectors its possible that you have introduced some dirt particles into the system.

Thanks shanegtr. Yesterday I removed both the return pipes, cleaned and flushed them. Still no joy, will try another new fuel filter.