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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, 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

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Year and Model: 1997 V70
Location: Ballarat

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.

That is, I press the button for about 1 second, there is a delay then one flash, a delay then two flashes, a delay then two flashes then nothing unless I press the button again.
I see on this site an articles about 1996-1998 codes but it states they are 4 digit. I am only getting three.
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.

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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Re: Volvo V70 Fault codes

Post by Ozark Lee »

The simplest way to get engine codes is to use an OBD-II scan tool rather than trying to use an OBD-I flash code system. The Bosch Motronic 4.3 supports flash codes through the OBD-II port but I'm not sure about other ECUs. Since you technically have a European spec car then you may or may not even have a Bosch ECU. The flash codes are different for the Fenix and the Bosch systems but they are all reported accurately with the OBD-II P codes.

'94 850 N/A 5 speed
'96 Platinum Edition Turbo
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
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Re: Volvo V70 Fault codes

Post by BEJinFbk »

'98 V70 R - Well Equipped for Life Up North... ;)
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Re: Volvo V70 Fault codes

Post by theWIFES_S70 »

1998 Volvo S70, N/A, 5-speed, 185K
2007 Volvo S40, 2.4i, 5-speed, 100K
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