Xsara II 2.0 HDI 90 limp mode

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dave_xsara
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Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

Hi.

Was driving up motorway yesterday at a steady 70mph and the car suddenly dropped into limp mode.
After approx 1 minute (if even) the car returned to full power and journey onwards was uneventful.

I've just taken the lexia to the car to see what happened and I'm guessing that it is the fuel pump. But as there are a lot of gubbins in the fuel system of the hdi can someone tell me what is going on here? Refer to attached images for the faults.

What I noticed when running the global test e that when the bsi was completing, the fuel gauge would drop to empty and the low level warning would come on and remain on until power was cycled. If this normal.

Anyhow, images attached. Can anyone inform me what this could be related to?


Thanks.
Attachments
IMG_20200603_223948.jpg
IMG_20200603_223926.jpg
IMG_20200603_223908.jpg
IMG_20200603_224225.jpg

dave_xsara
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Joined: 24 Nov 2010, 22:35
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

Just re-reading this and I realised that the BSI has faults on alternator and the battery charge - could this be more likely a power issue which caused the fuel system to cut out temporarily?
In the cabin there was no noticable power loss.

As there was no timestamps on the faults I can't tell if they are related or whether these are from I was doing previous work and may have disconnected the battery.

wheeler
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Re: Xsara II 2.0 HDI 90 limp mode

Post by wheeler »

dave_xsara wrote:
03 Jun 2020, 23:19

What I noticed when running the global test e that when the bsi was completing, the fuel gauge would drop to empty and the low level warning would come on and remain on until power was cycled. If this normal.
Its totally normal for stuff like that to happen during a diagnostic communication, you usually also get ABS & airbag system faults flashing up when its talking to the respective system.

Ignore the evaporator temp sensor, speed info fault & the brake signal fault. They are known 'phantom' faults & will be in nearly every RHY/RHZ engine you scan.
Although before ignoring the brake switch fault just confirm the brake lights are working correctly.

If you had a charging issue I reckon there would almost certainly have been other electrical symptoms, I'd say the fault you experienced would almost certainly be caused by P0190. First off how old is the fuel filter? is this a Bosch or Siemens system?

EDIT: Just checked & it turns out the alternator fault code is also a phantom fault.
Attachments
Xsara MUX.jpg

dave_xsara
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

Is a bosch unit. Probably about 10yo at best.
I know the contacts on the fuel gauge were worn badly so it's been there a while.

dave_xsara
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

wheeler wrote:
05 Jun 2020, 13:22
Ignore the evaporator temp sensor, speed info fault & the brake signal fault. They are known 'phantom' faults & will be in nearly every RHY/RHZ engine you scan.
Although before ignoring the brake switch fault just confirm the brake lights are working correctly.
Why is it when you go into the live data, are the clutch and accelerator presses detected, but the brake switch is not?
I checked and the brake lights work correctly.
If you had a charging issue I reckon there would almost certainly have been other electrical symptoms, I'd say the fault you experienced would almost certainly be caused by P0190. First off how old is the fuel filter? is this a Bosch or Siemens system?
Filter was changed 06/2019 - about 5k miles ago. Bosch fuel pump circa 15 years old.

wheeler
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Re: Xsara II 2.0 HDI 90 limp mode

Post by wheeler »

There may be more than one brake switch in live data, sometimes a second one for cruise control if fitted. Failing that it may just be a software glitch.
Which fuel pump was replaced? could be signs of the LP pump failing, fairly common, id say 15 years is a long time to get out of a LP pump on one of these.

dave_xsara
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

This has happened twice now. First time I was in the outside lane of motorway when car suddenly died and I had to swerve over onto the hard shoulder. Luckily it was not at rush hour or there would have been a massive accident.
Hence, why I am keen to get this resolved. It's okay at the minute as the roards are quiet and I'm not commuting, but it can be a bit unnerving when it happens.

It was the in-tank LP pump replaced 15 years ago.
HP regulator has replaced recently to resolve some severe hunting.

dave_xsara
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

Twice this evening whilst drivign on motorway the fuel gauge dropped to completely empty and orange fuel light started flashing. Can back on after about a minute orso both time. Didn't notice any power drop, but it was slightly hunting more than usual.

Wiring issue or pump issue?

wheeler
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Re: Xsara II 2.0 HDI 90 limp mode

Post by wheeler »

Have you had a look at the connector on top of the in tank fuel pump? The orange low fuel light flashes like this if you switch on the ignition with the pump/sender unplugged or open circuited.
Id make sure its securely seated & the connections look good, give them a clean. After that im sure the wiring runs up under the centre console through a big round twist connector right above the handbrake adjuster, this often gets disconnected to adjust the handbrake, maybe not locked together properly?? worth a look.

dave_xsara
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

Rechecked after the gauge issues.
All faults as previous except the P0190 was not there this time.
Console connection was fine. Cleaned terminals on the in tank pump. So will see what happens now.

dave_xsara
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Joined: 24 Nov 2010, 22:35
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Re: Xsara II 2.0 HDI 90 limp mode

Post by dave_xsara »

IMG_20200722_205836.jpg
Got P0190 again this evening.
I noticed that the fuel pressure is 290 bar. The cause is still not confirmed yet. Any ideas?