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Home > Puma (Tdci) > 2.4 Check Engine light, Power loss, Limp mode. Need help!!

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caravelle63

Member Since: 25 Apr 2023
Location: Balearic Islands
Posts: 13

thanks lighting, then there is definately something wrong with mine.. 0-100 KMH is like 60 seconds..
I got the check engine light again yesterday for a bit , took the car to a shop to get scanned the codes are: (tried my best to translate from spanish)

P0091-12 Low tension on the fuel pressure regulator control circuit.
P1169-00 Pressure of sensor in fuel rail high buy withing limits.
P0088-09 Pressure of system or fuel rail system very high.
P0089-7a Functioning of the fuel pressure regulator.

Any ideas what else could be going wrong? the VCV has already been replaced.

5th Jun 2023 3:39pm

caravelle63

Member Since: 25 Apr 2023
Location: Balearic Islands
Posts: 13

Could the loss of power be related with the fuel system? even though the sensation i get when driving is that there is no boost, i can hear the turbo spooling and with the OBDlink monitor app i see it gets up to 15 PSI every time i go on the pedal, i have checked everywhere for leaks, i have also pressurized the system to see if i could hear any air leaks with some piping and a bycicle tyre valve like i saw in another thread. The turbo actuator also seems to be working fine.

5th Jun 2023 3:52pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16858

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

Yes, it could. This kind of problem in the absence of DTCs is usually suggestive of a VCV fault. Try monitoring the fuel rail pressure to see if it is erratic and drops when the problem occurs.

As a general rule, on a 2.4 if you have any kind of rough running, misfire, stalling, or loss of power symptoms and there are no relevant DTCs, suspect the VCV.

5th Jun 2023 5:04pm

Ianh

Member Since: 17 Sep 2018
Location: Essex
Posts: 1736

If it’s not the vcv, because the dealer fitted a genuine one ( as long as they fitted a gen one, it has been known for dealers to fit non gen parts ) Could it be turbo actuator wiring as the harness can suffer chafing ? Worth having a good look.

5th Jun 2023 6:25pm

caravelle63

Member Since: 25 Apr 2023
Location: Balearic Islands
Posts: 13

I have recently replaced the VCV for OEM one. Could it be the pressure sensor on the rail or the pressure release valve? Also how do i monitor the pressure ? Thanks for the response

5th Jun 2023 6:27pm

caravelle63

Member Since: 25 Apr 2023
Location: Balearic Islands
Posts: 13

Thanks ianh, the wiring harness looks fine, i dont know how to further inspect it, should i just order that section from the harness and replace it?

5th Jun 2023 6:30pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 16858

caravelle63 wrote:
I have recently replaced the VCV for OEM one. Could it be the pressure sensor on the rail or the pressure release valve? Also how do i monitor the pressure ? Thanks for the response

Most diagnostic tools have the capability to monitor various engine parameters in real time, usually including fuel rail pressure.

It could be the FRP sensor or the FR PRV but these are less likely than the VCV, and it is not unknown for new VCVs to be defective (especially as the world is awash with counterfeit Denso valves at the moment).

Where did you buy the VCV you fitted? "OEM" means different things to different suppliers, unfortunately.

5th Jun 2023 6:38pm

caravelle63

Member Since: 25 Apr 2023
Location: Balearic Islands
Posts: 13

Thanks Blackwolf, the VCV was ordered from the dealership.. i have the obdlink but i can only monitor the fuel flow speed, i will look into that.

5th Jun 2023 6:51pm

caravelle63

Member Since: 25 Apr 2023
Location: Balearic Islands
Posts: 13

Ive managed to monitor the fuel rail pressure with the torque app and its running at
6000-7000 PSI @ idle,
6800-7300 PSI @ 1500 RPM
7100-8000 PSI @ 2500 RPM

24th Jul 2023 2:12pm

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