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S70, 1998, MAP and/or Altitude Sensor

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
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S70, 1998, MAP and/or Altitude Sensor

Postby newowner » 07 Feb 2010, 17:39

Hello,

I'm relatively new to the forum and would like to ask a question. My 1998 S70 is in need of assistance, I went from eight OBD error codes to one, but this one code is very confusing to me. Originally my OBD reader pulled P0108, (plus many others) so I replaced the "altitude" sensor, now I'm pulling a P0107 code. Also based on other posts I see the these part names used as they are in fact one in the same...

To add to my confusion I have a Hayes repair manual and in this manual I found a section talking about a MAP sensor having a vacuum line and mounted under the fan shroud. BTW, I have the page scanned if anyone is interested.

So which is correct - is it the sensor behind the passenger side headlight or the one under the fan shroud, and how do I fix this problem.

Any help would be greatly appreciated,
Dave
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Model and Year: V70,S70,850,C70 98

Re: S70, 1998, MAP and/or Altitude Sensor

Postby jblackburn » 07 Feb 2010, 18:59

Image

Here is the MAP sensor on my car.

And here is the part (called the same thing).

I'm not sure what the Haynes manual is referring to, unless the sensor was in a different location on the earlier 850 models. The one on your S70 should be where mine is, and have a vacuum tube coming out the bottom (which is not attached to anything).

If you already replaced the sensor, my advice would be to get some electrical contact cleaner and clean the contacts on the plug and on the sensor itself. I dealt with a series of both codes from my car for about 3 months, and finally, somehow or another, it started working again.

The MAP sensor in itself doesn't really DO anything, or adjust much in the way the car runs. My area is around 2300 ft in elevation, and between that and 300 ft back home, I did some experimenting and could not tell a difference between having the sensor plugged in and not. A Volvo mechanic said the exact same thing.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: S70, 1998, MAP and/or Altitude Sensor

Postby newowner » 07 Feb 2010, 20:00

Thanks for replying, and adding the photo, BTW, that is the part I replaced.
I thought if I could paste a picture of the page from the manual it might help. Is the manual wrong???
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Model and Year: V70,S70,850,C70 98

Re: S70, 1998, MAP and/or Altitude Sensor

Postby jblackburn » 07 Feb 2010, 20:49

Ah, that makes sense. That's for earlier versions of the 850 with a different ECU than our cars have. That's actually a good thing to know.

Your car and mine both have a Bosch Motronic 4.4 ECU, which is not covered there. In these (and I believe the 4.3 which all 850 Turbo versions used), the MAP sensor is the one you already know of :mrgreen:

If you reset the code, how long does it take to come back?

One thing you could try if cleaning the connector doesn't work is to try a hard-reset of the computer. I solved one issue I had with my car that way. Pull off the negative battery cable, go press on the brake pedal for a few seconds to drain the charge, and then reconnect it. Make sure you've got your radio code! This will essentially erase the computer's memory, and it will re-learn what to expect from the sensors and everything else. You'll have weird idling for the first few drives, but it will figure it out after 2-3 days.
'98 S70 T5 218K miles
2012 Chevy Cruze LT 6MT


A learning experience is one of those things that says, "You know that thing you just did? Don't do that."

mercuic: Long live the tractor motor!
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Re: S70, 1998, MAP and/or Altitude Sensor

Postby newowner » 07 Feb 2010, 22:32

It's a matter of seconds from the time I reset it to the time the light reappears. BTW, I used a electronic cleaner and sprayed down the entire connector, inside and out. I've had the battery disconnected for about two hours the other day while changing the air pump.

Thanks for the suggestions - please forward any others you might have.
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Model and Year: V70,S70,850,C70 98


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