2004 S60 showing Fuel Pressure Sensor Code

the tenor man · Post by **the tenor man** » 04 Dec 2011, 06:52

Hello,

I'm new to the Volvo S60. This one has about 95,000 miles on it.

The dealer has just replaced the Fuel Pressure Sensor under recall. The problem was surging and stalling. The new Sensor didn't solve the problem.

I connected my code scanner and the fuel pressure is jumping all over the map. It goes as low as 5lbs. when driving (car jerks) and as high as 78lbs. and also throws a fuel pressure sensor code.

The mystery is that after about 30 minutes of driving, the car settles down and runs fine. The fuel pressure stays at about 54-55 lbs. I've erased the code and it doesn't return until the next day when the engine is cold when the problem starts all over again.

Could this be a loose wire on the fuel pump, a bad fuel pump or a bad fuel pressure sensor?

Any help would be greatly appreciated...many thanks in advance.

The Tenor Man

the tenor man · Post by **the tenor man** » 05 Dec 2011, 17:14

Hello again,

I've been digging a bit deeper into the fuel problem and here is what I have found:

On a cold engine, the fuel pressure is once again all over the map (34-78lbs.)

...but when I disconnect the Fuel Pressure Sensor, the engine runs fine and the pressure is a constant 83lbs.

This is leading me to belive that the dealer installed Fuel Pressure Sensor is defective...

Any thoughts?

Thanks,

The Tenor Man

Post by **confused_al** » 05 Dec 2011, 19:06

the tenor man wrote: On a cold engine, the fuel pressure is once again all over the map (34-78lbs.)

It could be a bad sensor, but sounds more like the fuel pressure damper (Volvo calls the "absorber") is not working properly.

Brenan09 · Post by **Brenan09** » 18 Jun 2012, 12:20

Hello, I am having the same problem with my 2004 s60, did you ever find the cause?
Thank you,
Tim

Post by **igel513** » 18 Jun 2012, 16:18

tenor man, would you happen to know the location of the fuel pressure sensor?

Post by **jimmy57** » 18 Jun 2012, 19:52

From another post today on the same subject.
The fuel pump on that car is controlled by a fuel pump module, also known as pump electronic module. The engine computer reads the fuel pressure sensor and signals the FPM/PEM to regulate the fuel pump. The FPM/PEM is on the edge of the fuel tank under car and they can get corrosion at the connections. Can be serviced without removing the fuel tank as it on the right front corner. Volvo has a relocation kit to move the unit into the trunk.
The fuel could be a problem but usually on this system if the fuel pump is binding up the fuse will blow if it does it many times and it sounds like your car has stalled several times.
The problem is worse if driven slow and your husband probably drives more aggressively so it happens to him less. When the pump is run at its slowest speed which is driving slowly and coasting up to stoplights instead of running up to them and braking at the last instant, the connections get hot and the pump stops and it sets the code you have had read out.

To this I'll add: unplugging the FPS make the ECM run the full current signal to the FPM/PEM and it overcomes the issues. It is when the ECM is trying to control the fuel pump to a low current value that it acts up. When the pump gets warm and takes more current that also diminishes the problem. IT can also be the FPM/PEM failing but the connection is often the problem but it can burn the terminals on the FPM/PEM and you have to replace it.

Volvo stated out calling it the PEM but they call it FPM in some newer texts in VIDA. That is why I'm using both, I do not know what the shop you use may call it.

The cars late enough to have this system do not have the old absorber/damper. They use a flat hollow tube insterted inside the fuel rail to handle localized hydraulic pulses from injectors opening and closing.

Post by **igel513** » 18 Jun 2012, 20:12

Thank you for your post jimmy57. This could possibly be the solution to my problem of hard starts.

Post by **chrism** » 19 Jun 2012, 11:31

Brenan09,

I just went through this with our 05 S80. The sensor is located in the LH end of the injector rail (easy access). I was getting a stumbling acceleration when going up onramps, etc. Finally one day it stumbled really bed and the CEL came on. I read out code P0193 which indicates a bad reading from the fuel pressure sensor. My local independant Volvo shop confirmed my diagnosis and replaced the sensor.

Note: I did some research and apparently there is a known problem with the sensors to the point that Volvo issued a recall on some of the S60's and V70's. Why the S80's weren't included I don't know, so I had to pay to have mine fixed. But since you have an S60, I'd grab your VIN number and call a nearby dealer and see if your car is included. It's worth a shot. That little sucker costs about $150 - maybe $200+ if purchased from a dealer.

Brenan09 · Post by **Brenan09** » 20 Jun 2012, 13:48

Chrism, thank you for your response, the fps was the first thing we had replaced because that was the code we were told set off the cel... Nothing changed after replacing it so we are now leaning more towards the fpm/pem.... Sounds exactly like what we are experiencing! Similar to your story there was a recall with the s40s for this issue and despite the numer of s60s with the same problem there was no recall or extended warranty for us. Thank you sooooo much jimmy57 for explaining in such great detail! And on a side note I think this may have also answered the question as to why a message occasionally pops up that says 'anti skid service required'... Must be the ECM acting up? Igel513, the fps is located right under the hood and easily visible try googling an image of it

Post by **igel513** » 28 Jun 2012, 09:45

Jimmy, I checked under my 03 S60 to locate the FPM/PEM as you described and saw no modules by the tank. The only elec. part I saw was the unit attached to the vapor canister w/c I presume is a vacumn solenoid. It's not in the trunk so where could the FPS be?