Xantia RHZ HDI 90 in limp

[milemuncher]

Hello. I've got a well loved Ph2 Xantia with 263k miles on it........ it's never missed a beat until now........ It all started last week when it refused to start, turned over fine but wouldn't fire. Because it's only the work hack, i left it and took our other car. Next day just incase, i put a jump pack on it and she fired straight away and ran fine. Rushing around with it the last few days, i've let the fuel run low and today, i started the car and went to pull off and it lacked power drastically. I turned the engine off and restarted it. This time i got the dreaded engine management light and wouldn't rev over 2200 rpm ( limp mode? ). I have the grace of having my own Lexia, so i stuck it on and got these faults:

1. INTERMITTENT FAULT
DOUBLE RELAY CONTROL SHORT CIRCUIT TO -VE OR OPEN CIRCUIT

2. INTERMITTENT FAULT
INLET MANIFOLD PRESSURE SENSOR COHERENCE WITH ATMOSPHERIC PRESSURE

3.INTERMITTENT FAULT
FUEL PUMP SUPPLY SHORT CIRCUIT TO -VE OR OPEN CIRCUIT

I tried to clear these faults but they won't clear down . As a precaution i have changed the fuel filter and although it remains in the same state, i can drive the car and it seems to rev past 2200 rpm.

Any ideas to help me keep my Xantia on the road would be very greatly received

[citroenxm]

That sounds like its the Fuel Tank Lift pump giving its useuall break down ... hence the last fault.

One thing can cause other issues. The car is in limp mode because its also seen over or under pressure from the turbo, the HDi 90 uses a different turbo to the 110 and the boost is NOT controlled by an electro valve.

Id be looking at the tank fuel pump first.

[milemuncher]

got my " wires crossed " it's an RHZ so it's a 110!!!! i didn't know till an hour ago! tbh running it low on fuel has probably burnt the pump out........ will start there. Anyway to check throughly?

[citroenxm]

No i doubt running low on fuel has burnt it out. The tank pumps do only have a certain life on the originals.

As then for manifold pressure the ecu has detected an over boost from the turbo. This is caused by the wastegate being held shut by the vaccumm that controls this. The cause of that is useually the electro valve to the right of the drivers suspension sphere.. theres two electro valves.. one controls the turbo wastegate the other controls the egr. They useually go faulty and allow the vaccum to permanetly goto the waste gate there fore alowing over boost.