ECM-120D and ECM-2900 with P0089

About a week ago I had a CEL come on for P0089 - fuel pressure regulator. Upon scanning the codes in VIDA, I got ECM-120D -Air mass signal too low, and ECM-2900 -fuel pressure, faulty signal. I did some data logging in VIDA to check the duty cycle of the fuel pump, and found ~51% at idle, and upon revving to ~3000k rpm, it would go down to 27% consistently. Idle does feel rough. I've had to drive about 500 miles with this code on since this car is my daily.

I should also note that the fuel rail pressure sensor was replaced about 15k miles ago, the fuel filter was done in the last 7k miles, and the fuel pump was done in the last 1k miles.

I'm gonna do a leak down test, clean the MAF sensor (which was also replaced about 17k miles ago), and run some fuel system cleaner.

Any thoughts?

What brand of MAF sensor did you use?

I used the OE Bosch one from FCP Euro. I always use OE parts.

You have the computer telling you there is a faulty signal from the fuel pressure sensor. Maybe you should check the signal from that sensor.

Brett

I had the P0089 and P0100 (MAF) codes two weeks ago ... on a road trip in the mountains and the car also started running noticeably rough when the codes popped up. I also had (fairly) new fuel filter (20K), fps (70K), and MAF (70K). The one shop up there happened to have one last fuel pressure sensor in stock for $110, no returns, and I took a chance and bought it (FCP is $35!), as I was far from anywhere and in the middle of a trip. I figured that if the MAF had a problem, it would probably not have triggered the P0089 but other way around could be likely. Popped the new one in and both codes went away and car runs smoother. It must have been going bad for a while, as the car does run better than before although it was running strong so I didn't have concerns prior to the codes.

Theres a different code that relates directly to the fuel rail pressure sensor... i’ve had that one in the past, hence the new pressure sensor. Could be worth a shot though, I bought it on FCP Euro so its a free replacement

Interesting. May have to give the pressure sensor a shot then. Luckily its an easy job (as long as i fully depressurize the fuel rail this time)

Yes, that's good as FCP will be returnable / warrantied. Even de-pressurized, plenty of gas poured out so I had a rag under it when I pulled the old one.

I do wonder what people bring on long trips with our now mostly high mileage vehicles ... worth a new thread perhaps. Besides of course tools and a quart of oil, I only carry a spare ignition coil, wonder what else would make sense to keep in the car?

3/8" metric socket set (Williams) and set of metric combination wrenches (Stahlwille), pliers, screwdrivers. Good tools. Modest collection. In a dedicated bag.

No spare parts. There are enough Volvo dealers across the country that I've always been able to get a part.

Those are great tools. I have a few vintage Williams socket sets, but, alas, all SAE. For the Volvo, I have the same basic tools but also a 3/8" breaker bar and deepwell 19mm socket, and a pry bar for unexpected uses. Twice I've had to replace coils so that's why I bring a spare one.