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2007 Volvo XC90 V8 P0174

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
SchmidtKA
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SchmidtKA

2007 Volvo XC90 V8 P0174

Post by SchmidtKA » Wed Mar 20, 2019 4:57 pm

Hello,

We're having some trouble tracking down what is triggering a lingering lean code in Bank 2 (P0174) of our XC90. Here's the history:

Awhile back, we were having FPS codes intermittently being tripped p0089 and p0193. This would mostly happen after sitting in stop and go commuter traffic. We then noticed a lean code (P0174) was occasionally thrown. Drivability, stalling, choking, change in fuel economy = not present. Car has been driving normally this entire time.

New FPS was recently installed and I haven't seen p0089 or p0193 since. P1074, however, is continuing to get tripped at regualr frequency. The code is tripped at idle, and no stalling or hesitation is noticed. car seems to be driving normally.

DTC Freeze frame data (at idle, when code is pulled) indicates the following (this is about the same with every code read after we clear and it returns):

Fuel trim and EQ ratio seem in range, so I'm scratching my head...any thoughts? We're about to pop a new MAF sensor in there just in case.

Fuel Sys 1: CL
Fuel Sys 2: CL
Calc Load: 23.1%
STFT BANK 1 : -4.7
LTFT BANK 1: 3.1
STFT BANK 2: -5.5
LTFT BANK 2: 4.7
Fuel PSI: 69.2
MAP (hg) 11.2
RPM: 668
Spark adv: 5.0
IAT: 73.4
MAF: .8 lb/min or 6.04g/s
TPS: 20.4%
Command EVAP: 66.3
BAR: 30.1hg
ECU Volts 14.3
Load value 20%
EQ Ratio 1.01
REL TPS 3.5%



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RickHaleParker
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Re: 2007 Volvo XC90 V8 P0174

Post by RickHaleParker » Wed Mar 20, 2019 5:36 pm

Volvo DTC ECM-P017400

Definition:
System Too Lean (Bank 2)

Description:
Engine Control Module (ECM) receives information from the heated oxygen sensor about fuel/air mixture in different load areas. If Engine Control Module (ECM) registers that fuel/air mixture deviates too much from target lambda, so that adaptations for bank 2 end up in any of its end-positions, the diagnostic trouble code is generated.

Cause:
  • 1. Too high ethanol content in fuel.
    2. Incorrectly installed/damaged oil dipstick (air leakage).
    3. Air leakage intake manifold.
    4. Air leakage, exhaust pipe.
    5. Low fuel pressure.
    6. Damaged mass air flow sensor.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

SchmidtKA
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SchmidtKA

Re: 2007 Volvo XC90 V8 P0174

Post by SchmidtKA » Fri Mar 22, 2019 11:49 am

Update: we replaced the MAF. No change and were still pulling a lean code for bank 2 only. Based on freeze fram data, I'm not sensing fuel pressure is an issue. Recommended next steps?



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ggleavitt
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ggleavitt

Re: 2007 Volvo XC90 V8 P0174

Post by ggleavitt » Fri Mar 22, 2019 12:36 pm

Maybe get yourself a copy of a VIDA image and install it on a working machine (PC or Mac). Link in this forum I think or you can do an internet search for "VIDA 2014D image" and follow the instructions in one of the links that comes up.

A few of the cause items listed above have individual troubleshooting pages. One such page notes your reported idle pressure of 69 PSI as being within the nominal 480kPa called out in VIDA for idle on a warm engine. Another troubleshooting section requires the adaptation values reset to zero and the car driven to see what's what, for this you'll need a DICE to connect to the car.

I'm guessing it's worth a look at the documentation in VIDA to get some detail as to what criteria triggers the ECM-P017400 code and how Volvo suggests it can be diagnosed and addressed.

Valve cover gaskets or any hoses removed and replaced recently? Oil dipstick "clicks" into the block when fully inserted and it's not loose? I'm guessing air leak at this point with all you've replaced thus far but that's just a guess.

Edit 032219- typo (you've)
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SchmidtKA


2005 2.5T AWD-192k
2008 V8 AWD Sport-121k

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