Problems reading fault codes with reader

RaelG · Jun 26th, 2020, 14:08

So I've made myself a little fault code reader using the instructions I found on this forum and all was going swimmingly until it came to the fault codes to be read out and nothing happened, not even a 1-1-1.

So...what could be the issue?

It is a 1996 850 2.5 SE estate with what I believe is a 10v engine. In terms of the little reader I know the LED works because it illuminates fine but when I push the "dipper" wire in for 2 seconds and then release, the LED goes off but then nothing at all happens after, even if I wait a while. I tried with the ignition on position 2 to start with, then tested position 1 and also with the engine on all with the same result...nothing.

Any suggestions clever people? I should probably explain that I have the engine management light on so am trying to use the reader to help figure exactly what the issue is so that I can fix it.

Thanks

4x4 · Jun 26th, 2020, 14:30

Where did you connect the flash code reader? What pins did you connect to?

RaelG · Jun 26th, 2020, 14:35

16 - positive
3 - negative and one end of the dipper
5 - other end of dipper but just for 2 seconds or so

the LED lights up while the dipper wire is being dipped in number 5

4x4 · Jun 26th, 2020, 15:10

Have you tried changing 3 and 5 round?

4x4 · Jun 26th, 2020, 15:14

The other combination I have read is
16 - positive
6 - negative and one end of the dipper
5 - other end of dipper

This didn't work for my car but it does with others I know

RaelG · Jun 26th, 2020, 15:15

Happy to give that a try. Will do it later on when its not a billion degrees and report back any progress. Thanks Mr 4x4.

RaelG · Jun 26th, 2020, 19:24

Ok tried both of those without success.

I’m wondering if any of the following are possible:
Does there need to be a specific amount of oomph in the battery for this to work?
Could my car have a different system like the actual OBD one?
Have I done something stupid?!

4x4 · Jun 26th, 2020, 19:45

Not sure what's going on, are you sure you wired it correctly? does the LED work?

RaelG · Jun 27th, 2020, 00:23

I am going to take it all apart tomorrow and get my soldering iron out to make some better connections but yes I’m sure I made it right, the LED lit up ok when powered using number 16 and I think it was number 3 but yes the bulb is ok.

Got me bloody flummoxed it really has!

daveoc30 · Jun 27th, 2020, 08:20

I've copied and pasted this

OBD-II pin 16 (12v) -> DB9 pin 9
OBD-II pin 14 High speed CANL > DB9 pin 2
OBD-II pin 11 Low speed CANL > DB9 pin 2
OBD-II pin 6 High speed CANH > DB9 pin 7
OBD-II pin 5 Ground > DB9 pin 6 & 3
OBD-II pin 3 Low speed CANH > DB9 pin

From https://paul.sullivan.za.org/volvo-c...BD-II_CAN-bus/

It would seem your numbers don't quite match up? (assuming I've understood what you're trying tp do)

I can verify that using that pinout I get can data to my laptop (I've built plugs for both the high and low speed busses) on my 2010 C30

D

Jun 26th, 2020, 14:08	#1
RaelG Senior Member Last Online: Mar 18th, 2024 15:39 Join Date: Nov 2009 Location: Gatwick	Problems reading fault codes with reader So I've made myself a little fault code reader using the instructions I found on this forum and all was going swimmingly until it came to the fault codes to be read out and nothing happened, not even a 1-1-1. So...what could be the issue? It is a 1996 850 2.5 SE estate with what I believe is a 10v engine. In terms of the little reader I know the LED works because it illuminates fine but when I push the "dipper" wire in for 2 seconds and then release, the LED goes off but then nothing at all happens after, even if I wait a while. I tried with the ignition on position 2 to start with, then tested position 1 and also with the engine on all with the same result...nothing. Any suggestions clever people? I should probably explain that I have the engine management light on so am trying to use the reader to help figure exactly what the issue is so that I can fix it. Thanks __________________ Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate

Jun 26th, 2020, 14:30	#2
4x4 Premier Member Last Online: Today 12:43 Join Date: Dec 2017 Location: North of Hadrian's Wall & South of Antonine's Wall View Photos By: 4x4	Where did you connect the flash code reader? What pins did you connect to? __________________ MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website

Jun 26th, 2020, 14:35	#3
RaelG Senior Member Last Online: Mar 18th, 2024 15:39 Join Date: Nov 2009 Location: Gatwick	16 - positive 3 - negative and one end of the dipper 5 - other end of dipper but just for 2 seconds or so the LED lights up while the dipper wire is being dipped in number 5 __________________ Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate

Jun 26th, 2020, 15:10	#4
4x4 Premier Member Last Online: Today 12:43 Join Date: Dec 2017 Location: North of Hadrian's Wall & South of Antonine's Wall View Photos By: 4x4	Have you tried changing 3 and 5 round? __________________ MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website

Jun 26th, 2020, 15:14	#5
4x4 Premier Member Last Online: Today 12:43 Join Date: Dec 2017 Location: North of Hadrian's Wall & South of Antonine's Wall View Photos By: 4x4	The other combination I have read is 16 - positive 6 - negative and one end of the dipper 5 - other end of dipper This didn't work for my car but it does with others I know __________________ MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website

Jun 26th, 2020, 15:15	#6
RaelG Senior Member Last Online: Mar 18th, 2024 15:39 Join Date: Nov 2009 Location: Gatwick	Happy to give that a try. Will do it later on when its not a billion degrees and report back any progress. Thanks Mr 4x4. __________________ Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate

Jun 26th, 2020, 19:24	#7
RaelG Senior Member Last Online: Mar 18th, 2024 15:39 Join Date: Nov 2009 Location: Gatwick	Ok tried both of those without success. I’m wondering if any of the following are possible: Does there need to be a specific amount of oomph in the battery for this to work? Could my car have a different system like the actual OBD one? Have I done something stupid?! __________________ Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate

Jun 26th, 2020, 19:45	#8
4x4 Premier Member Last Online: Today 12:43 Join Date: Dec 2017 Location: North of Hadrian's Wall & South of Antonine's Wall View Photos By: 4x4	Not sure what's going on, are you sure you wired it correctly? does the LED work? __________________ MY2010 XC90 SE (M66-manual) Magic Blue (467) Sold MY1997 850 GLT (62,000 miles) Silver Sand (419) MY2005 V70 2.5T (66,000 miles) Willow Green (471) Volvo 850 GLT website

Jun 27th, 2020, 00:23	#9
RaelG Senior Member Last Online: Mar 18th, 2024 15:39 Join Date: Nov 2009 Location: Gatwick	I am going to take it all apart tomorrow and get my soldering iron out to make some better connections but yes I’m sure I made it right, the LED lit up ok when powered using number 16 and I think it was number 3 but yes the bulb is ok. Got me bloody flummoxed it really has! __________________ Current: 1996 850 2.5 SE Estate (project) and Mercedes CLS63 Previous Volvos: 1995 850 2.5 SE Saloon and 2003 V40 Sport Lux 1.9d Estate

Jun 27th, 2020, 08:20	#10
daveoc30 New Member Last Online: Dec 27th, 2020 10:04 Join Date: Jun 2020 Location: Wimbledon	Pin ordering I've copied and pasted this OBD-II pin 16 (12v) -> DB9 pin 9 OBD-II pin 14 High speed CANL > DB9 pin 2 OBD-II pin 11 Low speed CANL > DB9 pin 2 OBD-II pin 6 High speed CANH > DB9 pin 7 OBD-II pin 5 Ground > DB9 pin 6 & 3 OBD-II pin 3 Low speed CANH > DB9 pin From https://paul.sullivan.za.org/volvo-c...BD-II_CAN-bus/ It would seem your numbers don't quite match up? (assuming I've understood what you're trying tp do) I can verify that using that pinout I get can data to my laptop (I've built plugs for both the high and low speed busses) on my 2010 C30 D

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