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Discussion Starter · #1 ·
Hey there folks, I'm brand new to the forums (finally stopped lurking and decided to make an account),

I tried finding a thread that answers my questions, but no luck.

I bought my V50 2.4i 2004 (170bhp) about two months back, since then the following has been changed: belts, oil, filters, spark plugs, MAF. I know for a fact that the clutch needs to be changed (still drivable).

A couple of weeks back the car starting being a pain. Started "hesitating" all of a sudden when cruising at a higher speed (from 80 km/h to 140) as if the engine is running out of petrol, but it isn't (at that point did we change the spark plugs).
The problem continues. Yesterday without any warning all of a sudden it started losing power and finally died on the side of the road, and each time I tried to start it up it would die some seconds later.
About 20 minutes afterwards I managed to start it up (without doing anything) and continue on my way as if nothing is wrong.

Connected VIDA to the car and got these:

ECM-2B00 Fuel temperature sensor - Signal too high (red)
ECM-914C Throttle Valve - Signal too low (red)
ECM-2B0A Fuel temperature sensor - Faulty signal (yellow)
ECM-2B0B Fuel temperature sensor - Signal too high (red)
ECM-640A Inlet camshaft control - Signal too low (red)
ECM-2600 Fuel pressure sensor - Signal too high (yellow)

From what I've managed to see the Fuel temperature sensor and the Fuel pressure sensor are the same sensor, can someone confirm this ? (part no: 8699448)

And can someone point me at what else might be causing these codes, and issues ?

Thanks in advance for any information!
 

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Yes one sensor measures both temperature and pressure. Thread in the sticky, easy to replace.

Check the connector on the throttle valve, but don't mess with it for now.
 

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One other question, how old is the battery?
 

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Discussion Starter · #4 ·
Yes one sensor measures both temperature and pressure. Thread in the sticky, easy to replace.

Check the connector on the throttle valve, but don't mess with it for now.
One other question, how old is the battery?
Right, about 1 hour after I tried to post this question I found the sticky, and ordered the FPS (hopefully it'll arrive in a couple of days).

I've had the car for 2 months, so unsure how old the battery is, but considering that the water pump and the spark plugs were original (pump from 04), I don't think it's very new.

Thanks for the answer! (This forum is awesome, found so much helpful stuff)
 

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There should be a date code on a sticker on the top of the battery, usually a two-number month and two-number year. Out-of-range codes in multiple modules can often be power-related, so it's worth checking.

FPS is worth replacing pretty much no matter what, since it's easy and inexpensive, and commonly drifts over time.

Original water pump is no big deal at all. They last forever and rarely leak.
 

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Discussion Starter · #6 · (Edited)
Right, changed the FPS, car drove great for about 20km, then started the same old stuff. (put in 0 261 230 236)

Random OBD scanner showed P0026 code, later on the same day Vida showed nothing at the first then without the car moving or being driven it showed 2B00 and 2B0B. Cleared, but they showed up again.

The battery might be a bit old, but seems fine, could it really effect the engine while driving this much?

PS (by edit): and now while holding the tripmeter button it shows 019 on the dash, any ideas ?
 

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Right, changed the FPS, car drove great for about 20km, then started the same old stuff. (put in 0 261 230 236)

Random OBD scanner showed P0026 code, later on the same day Vida showed nothing at the first then without the car moving or being driven it showed 2B00 and 2B0B. Cleared, but they showed up again.

The battery might be a bit old, but seems fine, could it really effect the engine while driving this much?
When it comes to battery issues - these cars are a fart away from dying on you because of how sensitive the electronics are to electrical throughput. Unfortunately when Volvo designed these cars, they put absolutely ZERO thought into low voltage/bad/spike voltage scenarios coming out of the battery, and given that this car was $30,000 USD in 2006, it's not really a shocker.
 

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Discussion Starter · #8 · (Edited)
Guys, please help....

Parts changed:
- Parts of the VVT
- Fuel pressure sensor
- throttle

The car continues to be troublesome .... between 2k and 3k RPM at times the car starts jerking as if it's low on fuel, if I downshift or if I lay off the gas pedal, it's okay.
The clutch needs to be changed, but I doubt that could possibly be causing this issue?

The FPS error still comes up. Last week it became undrivable, started jerking during highway speed, and then it showed something along the lines of "Reduced engine performance" I had to shut off the engine then after 10 minutes it ran fine.

I'm running out of ideas here... could it be connected to the fuel system somehow ?

This is some info with the engine off:
https://photos.app.goo.gl/7HrRC2G3487QTsQy5

Engine on, RPM about 0.8K:
https://photos.app.goo.gl/X9RjbypuUUhRP6Vm8

Engine on, RPM about 2K:
https://photos.app.goo.gl/WzCqaizoCwyX2HNv8

CODES:
ECM-2B00
ECM-2B0B
ECM-990F
ECM-914C
ECM-9A0A

ECM-990F frozen values:
https://photos.app.goo.gl/Xyhhq1zhVH7cnEfs8

FPS error frozen values:
https://photos.app.goo.gl/kLo2ziGqve27Gx11A
 

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Try unplugging the electrical connector that goes to the PCV/Oil Filter - often times it can short and cause a variety of weird issues. If all your issues resolve, if not, you got an issue somewhere else:

ECM-2B00 Fuel Temperature Sensor (Signal Too High Or Too Low)
ECM-2B0B Fuel temperature sensor - Signal too high
ECM-990F Torque Monitoring (Faulty Signal)
ECM-914C Throttle valve - Signal too low
ECM-9A0A Vehicle Behavior. Behavior 1-7 (Simulated Values)

This guy had practically all same error codes as you:
https://forums.swedespeed.com/showthread.php?229583-Suspect-ECU-%96-fixable

So to me, reading these codes - you have an issue with your throttle body and with your FPS. You've replaced your FPS so you're good there - which IMO points to supply issue.

You mention you changed the throttle - but don't mention if it's the throttle body or the throttle pedal....and you don't say you've replaced the battery yet. So get it tested, and try unplugging your PTC Resistor on the oil filter and clearing codes and seeing if it's a random odd ground there causing your issues.
 

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Discussion Starter · #10 · (Edited)
Try unplugging the electrical connector that goes to the PCV/Oil Filter - often times it can short and cause a variety of weird issues. If all your issues resolve, if not, you got an issue somewhere else:

ECM-2B00 Fuel Temperature Sensor (Signal Too High Or Too Low)
ECM-2B0B Fuel temperature sensor - Signal too high
ECM-990F Torque Monitoring (Faulty Signal)
ECM-914C Throttle valve - Signal too low
ECM-9A0A Vehicle Behavior. Behavior 1-7 (Simulated Values)

This guy had practically all same error codes as you:
https://forums.swedespeed.com/showthread.php?229583-Suspect-ECU-%96-fixable

So to me, reading these codes - you have an issue with your throttle body and with your FPS. You've replaced your FPS so you're good there - which IMO points to supply issue.

You mention you changed the throttle - but don't mention if it's the throttle body or the throttle pedal....and you don't say you've replaced the battery yet. So get it tested, and try unplugging your PTC Resistor on the oil filter and clearing codes and seeing if it's a random odd ground there causing your issues.
Sorry, changed the Throttle body (put in a used one, from a car that drove without any problem), via Vida communication I had it open/close and it opened every time with only about 5-7% difference between requested and actual angle . As for the battery, I'll look into going somewhere to get it checked out.

Can you tell me what might cause the Fuel temperature sensor code to show up again after changing the Fuel Pressure Sensor (on the fuel rail) ?

Cheers!
 

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Sorry, changed the Throttle body (put in a used one, from a car that drove without any problem), via Vida communication I had it open/close and it opened every time with only about 5-7% difference between requested and actual angle . As for the battery, I'll look into going somewhere to get it checked out.

Can you tell me what might cause the Fuel temperature sensor code to show up again after changing the Fuel Pressure Sensor (on the fuel rail) ?

Cheers!
Either we are dealing with a bad non-namebrand sensor (low quality) or it is a bad sensor out of the box (unlikely) or something is pulling the signal high (ground).
 

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Agreed and the PCV element mentioned in the previous post is a likely culprit, especially if it's intermittent. The connector is just at the top right of the unit, when facing the engine. If it fixes, just leave it disconnected, it's optional and doesn't do much.
 

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Discussion Starter · #13 ·
Right, finally managed to get the car to a place where they checked the wiring. The problem was in the connector to the fuel pressure sensor itself, they changed the wires and the connector. The sensor itself is okay, doesn't show - 40°C fuel temperature anymore. Drove it for about 20-30km, highway and traffic jams, so far it drives perfectly.

Cheers and thanks for all the help and tips!

Sent from my BLA-L29 using Tapatalk
 

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Huh? Who changed the wires?
 

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Discussion Starter · #15 · (Edited)
Huh? Who changed the wires?
Car service/garage thingy in my town, they specialise in electrical wiring for all types of vehicles. The problem if I understood the mechanic correctly was in the connector itself.

I think the thingy I've circled in the picture (old pic, before FPS swap)
Sent from my BLA-L29 using Tapatalk
 
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