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2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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andeus
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2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by andeus » Tue Sep 11, 2018 1:13 pm

I have a 2004 Volvo S80, with the turbo 2.5L AWD engine. It was running fine prior to all this at ~158,000 miles

Before this moment, the only other time the car had such an alarming problem had been when it shut off after hitting a nasty pothole earlier that week (the car's electronics/fan/lights still ran, but the messages part and the engine shut off). Only P2407 (pending) was present when checked at the time.

I was driving home from work one day, on a back road since Garden State Parkway is bad at rush hour, when my car suddenly went into Limp Mode (Reduced Engine Performance).
My car slowed to a crawl, shaking and shuddering, and idled even worse. I pulled over safely and ran the code reader I had in the trunk-
Got codes P2111 (Throttle Actuator Control System Stuck Open) and P0420 (Catalyst System Efficiency Below Threshold), with a pending P2407 (Evaporative Emission System Leak Detection Pump Sense Circuit Intermittent/Erratic) code.

I knew about the P2407 code before, shortly after buying the car (used). It never affected the commute, so I figured I would have it looked into later.
Shutting off the car and disconnecting the battery for 10 minutes did not solve the issue.
Since I was out of the range of three miles for AAA, I knew I had to get home somehow (AAA charges a hefty towing fee per mile after three free miles). So, with stoic patience, I pressed on at 10 mph or less with hazards on, shutting off my car whenever it came at rest at a traffic light (remember, the bad idle). Eventually, after say, 10 miles or so, the message changed from Reduced Engine Performance to Engine System Service Required, and it returned(?) to faster speeds. After that, I was able to shut off the hazards and cruise home at 30 mph or less.
I arrived home and began to research.
One forum thread I discovered mentioned that the P0420 code is a common collateral symptom when P2111 triggers.
P2407 could be the fault of many things (comparatively small), and without a professional diagnosis, hard to pinpoint.

I now plan on replacing the Throttle Body under recommendation from my mechanic friend, rather than bother cleaning it and possibly having issues later.
The part sites I've viewed warned that the Body may need to be programmed prior to use.
But Xemodex's part listing states that "No software reload is needed."
If I understand it correctly, S80s prior to 2002 used a throttle body like this one and require a software reload/programming, but newer S80s use a throttle body like as shown here.

So, my question is broken into parts:
1) Will this resolve the P2111/P0420 issue?
2) Who is right? Does the newer Throttle Body need software, calibration, or neither?
3) If it needs to be programmed/calibrated, is this something only a dealer can do? Or can a European car mechanic do it?
4) If I get a used, working throttle body, can I have that installed and go? Or does that also need to be programmed?

Any kind help on this is appreciated.

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RickHaleParker
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Re: 2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by RickHaleParker » Wed Sep 12, 2018 1:58 am

When was the last time the throttle unit was cleaned?


Start with the ECM-91B7 (P2111) then go after the emission problems.

ECM-91B7 Throttle unit. Faulty signal

Diagnostic trouble code (DTC) information

Condition
Diagnostic trouble code (DTC) ECM-91B7 is stored if the engine control module (ECM), when attempting to adapt the throttle unit, registers that the movements of the throttle is impeded or that the return spring in the throttle unit is not functioning correctly.

Substitute value
Depending on the fault, the engine control module (ECM) can cut off the supply to the damper motor in the throttle unit. The throttle will then attempt to set itself to the return position.

Possible source
Faulty signal:
  • The throttle is sticking or is blocked (oil film, dust etc.)
    Contact resistance or oxidation in the terminals between the engine control module (ECM) and the throttle unit
    Open-circuit, short-circuit to ground or short-circuit to supply voltage in the wiring for the damper motor in the throttle unit
    Short-circuit to each other in the wiring for the damper motor in the throttle unit

    Defective throttle unit.
Fault symptoms
Driving/Hesitates/surges/Unsure when/at all times
Driving/Engine stalls/During acceleration
Driving/Engine stalls/During deceleration
Starting/Engine does not start/Unsure when/at all times
Driving/Engine stalls/At steady speed
Warning lights and chimes/Malfunction Indicator Light ("Check engine" light) indication/no indication
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4
1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4
2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000.

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andeus
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Year and Model: 2004 S80 2.5LT AWD
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Re: 2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by andeus » Wed Sep 12, 2018 4:53 am

RickHaleParker wrote:
Wed Sep 12, 2018 1:58 am
When was the last time the throttle unit was cleaned?
No idea.
Bought the car used about a month ago, private party.
That's why I'm leaning towards a replacement.

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Re: 2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by RickHaleParker » Wed Sep 12, 2018 6:33 am

andeus wrote:
Wed Sep 12, 2018 4:53 am
That's why I'm leaning towards a replacement.
Try cleaning the throttle unit and the electrical connectors before you do that!
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4
1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4
2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000.

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andeus
Posts: 4
Joined: Tue Sep 11, 2018 11:54 am
Year and Model: 2004 S80 2.5LT AWD
Location: Here
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Re: 2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by andeus » Wed Sep 12, 2018 7:25 am

RickHaleParker wrote:
Wed Sep 12, 2018 6:33 am
Try cleaning the throttle unit and the electrical connectors before you do that!
That's something I can do?
Where is it located, and how is it cleaned?
I saw one diagram in which it looks like it's on the front of the engine, where one would tug to idle the car while running and with the hood open.

Also, if this (hypothetically) does not work, what about my other questions?

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andeus
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Re: 2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by andeus » Thu Sep 13, 2018 7:46 am

Just checked; I don't see the Throttle Body.
It probably is in an area I cannot reach. The large tubes/hoses seem to snake to the back, behind the engine.

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RickHaleParker
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Re: 2004 S80 2.5T AWD Throttle Body vs. OBD code P2111

Post by RickHaleParker » Thu Sep 13, 2018 9:01 pm

2018-09-13.png
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4
1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4
2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000.

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