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Still showing a P0190 trouble code

Tiny
S40JIM
  • MEMBER
  • 2008 VOLVO V40
  • 2.4L
  • 5 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
I have already replaced thee fuel pressure sensor with Bosch OE exact replacement (the "blue" o-ring). The Bosch p/n is what you get when you search with the Volvo part number.
I've driven the car about 80 miles after the replacement and the OBD tester still shows the P0190 "Stored" trouble code. The tester shows the car's computer is showing about 82 psi fuel pressure. You can't reset a "stored" trouble code with the OBD tester.

That's the only trouble code. I've seen some comments in the Volvo blogs that the MAP sensor is causing the trouble code.
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Monday, October 21st, 2019 AT 4:42 PM

13 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome to 2CarPros.

I'm not showing a V40 in my manual, but I am familiar with the code. That specific model isn't offered in the US. The code is indicating there is no signal from the sensor. Have you checked the connection to make sure there is no damage, you are getting a signal from the PCM, and you have a low reference?

Let me know.

Joe
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Tuesday, October 22nd, 2019 AT 5:49 PM
Tiny
S40JIM
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  • 7 POSTS
Sorry, I have a S40 not a V40. Not sure where the V40 came from. I'll check the connection on the sensor. Is 82psi "high". I think I saw somewhere the "normal" fuel pressure is 40psi.
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Tuesday, October 22nd, 2019 AT 7:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Welcome back:

No problem. They do make a V40, but it's not available in the US. As far as the pressure, that is too high. Picture 1 shows the manufacturer's specs. It indicates 300 to 400 kPa (kilopascal unit of measurement). That works out to 44 to 58 psi. At 80+, the engine is getting too much fuel.

I suspect there is a wiring problem either at the plug or between the sensor and the PCM. The code indicates no signal, so pay attention for broken wires and make sure the plug doesn't have pins pushed in or corroded.

Let me know what you find.

Joe
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Tuesday, October 22nd, 2019 AT 8:42 PM
Tiny
S40JIM
  • MEMBER
  • 7 POSTS
Thanks Joe. I'll check it as soon as possible.
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Tuesday, October 22nd, 2019 AT 9:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

You are very welcome. Let me know what you find.

Take care,
Joe
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Wednesday, October 23rd, 2019 AT 8:42 PM
Tiny
S40JIM
  • MEMBER
  • 7 POSTS
I haven't checked the pins or wiring yet. Where is the PCM? Is it on the right hand side of where the air cleaner is?
Also, I'm seen on a couple Volvo blogs, some comments that the P0190 code was due to a MAP sensor. That's on the intake manifold, so not sure how that would impact fuel pressure. I should be able to check the pins and wires in the next couple days.
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Thursday, October 24th, 2019 AT 11:34 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

I attached a picture of the location. As far as the MAF, like you I don't see it affecting fuel pressure.

Make sure you disconnect the battery before you disconnect the module. Before the battery is reconnected, make sure the module is connected.

Joe
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Thursday, October 24th, 2019 AT 5:45 PM
Tiny
S40JIM
  • MEMBER
  • 7 POSTS
I checked the connector, pins, and wires and didn't find anything. Nothing was bent or broken. There is another sensor right below the fuel pressure sensor that seems to be working. The wiring harness goes under the intake manifold, so I'd have to remove it to fully check it. I'm going to spray some contact cleaner in the connector(I didn't have any at the time). I probably need to get a wiring diagram to check each wire from end-to-end. The OBD tester is still showing fuel pressure over 82 psi.
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Sunday, October 27th, 2019 AT 11:42 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Have you tried using a mechanical fuel pressure gauge to confirm the pressure you see on the OBD is correct? The sensor may be bad.

Let me know.
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Sunday, October 27th, 2019 AT 8:57 PM
Tiny
S40JIM
  • MEMBER
  • 7 POSTS
I'm still working to test the fuel pressure. My fuel pressure test guage kit has all sorts of adapters for EU and US fuel injection systems, but nothing fits the Bosch male schrader valve fittings. I'm still working on it. Thanks for your comments and assistance.
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Sunday, November 3rd, 2019 AT 2:32 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Welcome back:

Nothing ever seems easy. LOL I checked the directions for attaching the gauge and see what you are dealing with. I attached a picture.

Let me know what you find. Take care,

Joe
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Sunday, November 3rd, 2019 AT 5:28 PM
Tiny
S40JIM
  • MEMBER
  • 7 POSTS
Is your diagram a generic one or one for a Volvo? Here is what the fuel rail diagram from Volvo for my car. The fuel pressure sensor is on one end of the pipe and the Bosch (I guess) male schrader valve is on the other end. That is where I'm trying to connect the pressure tester. I think getting an actual reading will tell where to go from here. I have a brass fitting that fits the threads but can't "press" the schrader valve. I may have to remove the valve and directly connect the tester (only if I can't figure-out an adapter).
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Sunday, November 3rd, 2019 AT 6:44 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Welcome back:

That is specific to your vehicle. I'm not sure I understand what is happening.

Let me know.

Joe
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Sunday, November 3rd, 2019 AT 9:01 PM

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