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1996 850R p0112

Help, Advice and DIY Tutorials on Volvo's P80 platform cars -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, including 850 R, 850 T-5R, 850 T-5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Texasbrainstew
Posts: 23
Joined: 29 June 2023
Year and Model: 1996 850 R
Location: Texas
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Re: 1996 850R p0112

Post by Texasbrainstew »

Yessir! And yessir I know, I just removed it myself and rebuilt a b5234t from a 95 turbo wagon and slapped it in there

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npexcept
Posts: 55
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Year and Model: XC90 I D5 (275) 2003
Location: Bonn, Germany
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Post by npexcept »

Couldnt find any useful infos in vida yet. Just tells for checking the wiring if the sensor in the bumper is okay. (see picture below, not much infos)
What manufacturer is printed on your MAF sensor? Bosch?
sensor3.png
sensor3.png (64.8 KiB) Viewed 353 times
sensor2.png
sensor2.png (60.9 KiB) Viewed 353 times
Just because you're trash, doesn't mean you can't do great things.
It's called garbage can, not garbage can not.

Texasbrainstew
Posts: 23
Joined: 29 June 2023
Year and Model: 1996 850 R
Location: Texas
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Post by Texasbrainstew »

Yessir Bosch

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npexcept
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Post by npexcept »

Okay, the Bosch variant has no built in temperature probe from what I've read.
So I guess, the fault is somewhere in the wiring from the sensor at the bumper to the ECU (?).
The sensor maybe lead to the ECC instead (located under the dashboard).
Maybe there is some connector loose. But at this point I'm just guessing.


I'm under 30, you dont have to call me Sir lol
Just because you're trash, doesn't mean you can't do great things.
It's called garbage can, not garbage can not.

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misha
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Year and Model: '97 850 2.5 20v
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Post by misha »

Wierd.
What is actual ambient temperature reading on board computer display?
Is it the same -40F like ecu sees it?
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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npexcept
Posts: 55
Joined: 18 November 2023
Year and Model: XC90 I D5 (275) 2003
Location: Bonn, Germany
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Post by npexcept »

misha wrote: 01 Feb 2024, 03:31 Wierd.
What is actual ambient temperature reading on board computer display?
Is it the same -40F like ecu sees it?
Texasbrainstew wrote: 31 Jan 2024, 13:56 Dang ECU is now reading that the ambient air temp sensor is showing -40°f.

My instrument cluster is reading the temperature correctly.
Just because you're trash, doesn't mean you can't do great things.
It's called garbage can, not garbage can not.

Texasbrainstew
Posts: 23
Joined: 29 June 2023
Year and Model: 1996 850 R
Location: Texas
Has thanked: 1 time
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Post by Texasbrainstew »

Man Im just about to finish my 30th year dont say that lmfao.
Sorry I got caught up in some stuff yesterday.

I checked all wires and grounds again just to be sure nothing is getting pinched or anything.

On the sensor and cluster note, when I pulled the sensor out with the car running the cluster read LO as it should. Just another way I tested to rule things out.

Is there any way you could send me a key for the wiring diagram picture! I'd like to see whatsup with those!

Texasbrainstew
Posts: 23
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Year and Model: 1996 850 R
Location: Texas
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Post by Texasbrainstew »

Mainly curious as to what 23/306 is and 4/30 on the diagrams you sent. The rest I'm assuming are pins?

Texasbrainstew
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Year and Model: 1996 850 R
Location: Texas
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Post by Texasbrainstew »

Wanted to also mention I payed attention to the ecc and I have no flashing lights when I start on the recirculation and ac buttons

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misha
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Year and Model: '97 850 2.5 20v
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Post by misha »

At this point...i would remove negative battery cable for couple of minutes and re-seat ecu while battery is disconnected.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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