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Volvo V70 Fault codes

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, 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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Year and Model: 1997 V70
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Volvo V70 Fault codes

Post by johnhb »

My 1997 Volvo V70 has an OBDII socket mounted in the console between the front seats. I have searched the internet but am getting confused messages as to 1/ How to read the codes and 2/ What the codes mean.

Here's what I've done so far. Connected a simple LED Pushbutton arrangement to the following pins
16 - 12V+
4 or 5 - Chassis and Signal ground
13 - not sure what this does but this is the only connection that gives me a reading. The code I'm getting is 1 2 2 with ignition position set to II.
My OBDII socket only has the following contacts - Pin 1, 3, 4, 5, 7, 13 & 16. There are no connections to the other holes in the socket.
I believe this is either ISO 9141-2K live or ISO142304-4 KWP.

If the code 1 2 2 comes from the engine then the technical bulletin for the AW50-42LE automatic transmission states that means Solenoid 2 Open Circuit. But if the code comes from the Cruise Control then it can be ignored.

I have not been able to find out how to reset the codes. There is no jumper box under the bonnet to select from where the diagnostic code is being read from.

Hope someone can help.

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Post by abscate »

I'm not sure you can read OBD II With the LED approach, John.

Usual method is to buy a reader and get the P codes, these range from $20-$200 depending on functions
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Post by Caspar »

Hey John,

my 97 V70 has the same arangement, and I had trouble with some commercial (expensive Bosch) ODB reader. Seems it's somehow a year between under-the-hood-LED and obd-only that confuses the Bosch OBD reader.

However, I put together this together


with help from this site, and it worked fine for me. Helped me figure out a few problems.

Hope this helps, Caspar

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Post by esl_97_850_T5 »


1. Did Casper's topic help?

2. What kind of engine/fuel ECU to you have? Motronic 4.4, MSA 15.7, Fenix 5.2, Motronic 4.3, ??.

1998 Volvo S70 GLT - 205.5K miles - S70 & M44 testbed in 2016-2019; traded 2019-07-15 (for spare time)
1997 Volvo 854 T5 - 147K miles - 850 testbed in 2012-2017; junked 2017-09

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