Freelander 1 P1190 Fuel Rail Pressure Plausibility! Help?

Okay, an update to my car’s problem of running rough just before shutting down.

Having done a lot of work I finally managed to trace the fault – I think.

The MAP sensor (Boost Pressure Sensor) on my car has failed.

The output volts is 4.9 and it doesn’t change.

I have a vacuum test pump and tools, and the change in pressure (+ & -) make’s no difference.

The ohms resistance across all three pins stays exactly the same too, with an emphasis between the Earth and Signal contacts.

Regardless of any amount of pressure changes and hitting it with a hammer, there was no difference.

I have one sensor on order, but as things stand it will take an age to be delivered. I’m now about to order a second unit, using an Express Delivery. The first to arrive will be put into use. The second will be carried as a spare in my pack-up.

I’ll update all as things progress.

My special thanks goes to Paul99 on LandyZone (see his input) for his MAP Test as shown on YouTube. That was an enormous help. Thanks Paul99.

Can you check your exhaust system for backpressure? Some of that lack of power makes me suspect a restricted exhaust. Sometimes the catalyst ceramic crumbles and causes a blockage. How does your turbo sound, and are you getting sensible boost readings from it? Have you pulled your map sensor and cleaned it? https://www.youtube.com/user/comeinhandynow has a video showing a test on the sensor.

I'm waiting for the replacement sensor to arrive. I'll keep you posted.

The latest news from my garage repair follows.
After replacing most sensors, both pumps & filters, checking this-and-that, the garage is pointing the finger at the Turbo. I, myself, had considered this too, and had already printed the procedure for replacing one as well as pricing a replacement. I didn't want to go to another unnecessary expense though, relying on my garage to offer a diagnosis.
It seems the milking computerised system that monitored my car indicated it was being choked. Which is to say, there was not enough air getting through to the engine, hence it cutting out above 2k revs. It was strangled, basically.
Monday will conclude what needs to be done.
But this will give some individuals a possible answer to P1190.
I was also informed my fuel feed system was working perfectly. I did use the phrase, 'Red-Herring' previously. And that's how it might be.
I'll write more next week.
I need to add, I did a test on my Turbo and it suggested there might have been a problem. You could try this yourself - although how relevant this is still has to be evaluated.
I isolated the vacuum hose to the Turbo Solenoid -blocking it so the brakes, etc, would be unaffected. This action prevented the Turbo from kicking in. I heard a loud howl from the Turbo area when I ran the car, something I've never heard before, its intensity altered with the revs.
It was as if the exhaust-driven Turbo-fan was struggling to rotate. Maybe yes, perhaps no. It's a thought though, and perhaps testing if you too have a P1190 fault code.
This code could, of course, cover a multitude of faults.

I forget to mention the garage (a BMW / Land Rover specialist) pointed out there were a few Software Upgrades outstanding, and as my car hadn't been anywhere near a land Rover agent in ages they could be done. Now that alone might be worth considering.

My final input to this Thread. There were two faults that contributed to the P1190 Fuel Plausibility error code and subsequent failures.
The Turbo needed cleaned-out as it was badly carbonised. The bearing proved to be okay so a clean did the trick.
Also, a brand-new set of Bosch Injectors was fitted. The originals settings were all over the place, where the ECU couldn't compensate for all that was wrong.

I'm now driving the car and it's really good. The injectors are expensive, and I'm sure others have good stories to tell about refurbished units.
I chose new because refurbished can be risky.
I hope this helps others with the same Fault Code, P1190 Fuel Rail Pressure Plausibility.

Hard Drive said:

My special thanks goes to Paul99 on LandyZone (see his input) for his MAP Test as shown on YouTube. That was an enormous help. Thanks Paul99.

Click to expand...

Thank you for your thanks, but it mostly should go to @comeinhandy as he makes these great, clear videos. They have helped me a lot, too. It's good that you got things sorted, and expanded our knowledge base.

paul99 said:

Thank you for your thanks, but it mostly should go to @comeinhandy as he makes these great, clear videos. They have helped me a lot, too. It's good that you got things sorted, and expanded our knowledge base.

Click to expand...

i totally agree with you Paul. The cominhandy videos on Youtube have certainty helped me, as have many LZ members with their ideas & comments. And likewise, I'll help others too.