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93 850 GLT Dash warning lights

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
1997 - 2000 V70-XC
1997 - 2004 C70

julesr_23
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93 850 GLT Dash warning lights

Post by julesr_23 »

Upon an unsuccessfull search, I haven't been able to find the meaning of the recent light on the dash. Next to the service engine light, orange with green triangle and upside down Y. Does anyone have the manual/know what this means?
Forgive my ignorance,
Cheers



-------------------------------------
2007 C70
1993 850 GLT -270km's
1984 240 Wagon R.I.P.
tailor
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Post by tailor »

orange with green triangle and upside down Y.
It is known as the Lambda or check engine light.
Best thing for you to do now is go the engine compartment and "pull" the codes from the "A" box and write them down.
Here is a link how to read them,
http://volvospeed.com/Repair/a2.html
and here is a link on how to decipher them:
http://www.matthewsvolvosite.com/chat/p ... hp?t=10758
and here is another post for interest,
http://www.matthewsvolvosite.com/chat/p ... hp?t=14275

You do not mention what problems you are experiencing so post the codes back and a lot of good and knowledgeable people on this forum will give you some input .
1994 850 Auto Turbo wagon 306000km (Sold)
2004 XC90 AWD 188000km

"Life is like a reel to reel tape recorder,
the closer you get to the end,
the faster it spins."
Abe Gottschalk
julesr_23
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Joined: Fri Feb 08, 2008 4:52 pm
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Post by julesr_23 »

Hey thanks for the precise steps to follow. Holy cow, the guizmo actually works!! All except for the fact that upon putting the jumper into "A2" the LED flashed 5-1-2. According to the list of diagnostic codes this number sequence is not a possibility. Am I missing something? What does 512 mean?
I was driving down a VERY bumpy road with lots of puddles (when the light turned on), could this have something to do with it? There is no apearent problems with the car.
Thanks again for the great help
meteg
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Post by meteg »

Hello,

the definition for the code 5-1-2 is:

"long term fuel trim too rich". which means you have to take the car to a shop which is specialized in these cars and then precisely find the true source of the problem.
Ozark Lee
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Post by Ozark Lee »

I would start by cleaning the MAF (AMM) sensor. Get some MAF cleaner and give it a good spray. Don't scrub it, don't even touch it. Just spray it on and let it dry.

A dirty MAF can cause that problem or a bad O-2 sensor can cause that problem. Start with the cheap stuff first.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
julesr_23
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Post by julesr_23 »

Thanks for the tips. MAF? Sorry I learned all this stuff in French and don't know the terms very well in English. However, spray on solutions sound good to me. Since I've owned this car (2years) I haven't kept up on that kind of maintenance. My alternative theory is that while I was driving down this ridiculously terrible road- some water might have gotten into the air box, whereby fooling the O2 sensors into thinking that there was more fuel then was needed, when in reality the fuel was fine and just the air coming in was less oxygenated then what it should have been.
Thanks again for the help, I'll look into the MAF cleaner after letting the air box dry out.
Cheers
MadeInJapan
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Post by MadeInJapan »

MAF is Mass Air Flow sensor. It is attached to your airbox and has a sensor wire connector coming off of it. Just simply take the clamp off from the airbox to the MAF housing (it's round) and you'll see the sensor in the middle of the round plastic housing. Spray it down liberally but don't touch it. Let it dry...hook it back up and see if you have improvement. If that's not it, look for broken, torn or leaking small vacuum hoses as well as turbo hoses (especially the one under the throttle cable cover (one torx screw). Sometimes these can cause the 02 sensor error too.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
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Post by Ozark Lee »

MAF is shorthand for Mass Airflow Sensor - which is what most manufacturer's call the device. Volvo calls it an Air Mass Meter (AMM).

It is inset into a tube just past your air filter box and it has an electrical connector that hooks up to it.

If you remove the connection that goes between the short tube that extends from the air filter box and the flexible "S" shaped tube that goes between the short tube and the throttle body you should be able to see the device protruding into the short intake duct. You will need to also unclip the top of the intake air box to gain full access. That is the MAF/AMM sensor.

What it does is measure the amount of air entering the intake system and then the computer adjusts the amount of fuel it sprays from the injectors based on, among other things, that amount of air. If it reads the amount of air wrong then it gets the amount of fuel wrong.

The oxygen sensor detects that the mixture is wrong and it will then try to tell the computer to adjust the mixture but the oxygen sensor has only a finite range. Once it gets to one limit or another (to rich or to lean) it gives up and sets a code.

Here is a picture of what I am talking about:

Image

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
MadeInJapan
MVS Moderator
Posts: 13424
Joined: Thu Mar 31, 2005 7:14 am
Year and Model: '98 S70 T5 '07S40T5
Location: Knoxville, TN American but born in Japan
Has thanked: 7 times
Been thanked: 27 times

Post by MadeInJapan »

It certainly is different than a Turbo model, but the location and what you do is the same.
'98 S70 T5 Emrld Grn Met/Beige Tons of Upgrades Mobil-1
'04 V70 2.5T Red/Taupe Some Upgrades Mobil-1
'07 S40 T5 AWD 6 speed manual! Silver/Black Stage1 Heico & Elevate
'07 S60 2.5T Blue/Taupe- my kid's Volvo
julesr_23
Posts: 24
Joined: Fri Feb 08, 2008 4:52 pm
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Location:

Post by julesr_23 »

I just wanted to thank you all again for the great help and advice, such quick replies made it easy to get the job done efficiently.
After reseting the module there has been no other warning lights (I drove 200km's this morning). So I'm assuming that it was just a temporary thing. I will however spray it with the cleaner that you suggested today just in case. Do to this exercise, I have furthered my "impressedness" of these great cars.
As a last question: My windsheild washer fluid light is always on -no matter how full the reservoir is- is there a combination of buttons (in that A module) I can press to turn it off?
Appreciatively,
Julesr




----------------------
2007 C70
1993 850 GLT 270kms
1984 240 wagon R.I.P.
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