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Post Title: mk3 golf bad obd reader
Posted by: pos mk3 golf at 8:43 AM 8-31-2008
Hi i have a mk3 golf 95 when i plug an obd reader in it says system erroe i tried obd readers @ 3 dif garages and they all say the same i tried to flash the codes on the dash but when i put the jumper wire in the check engine light just stays on. My car runs good for the most part but it is having problems with starting off and the engine light is on Please help. 
Post Title: Re: mk3 golf bad obd reader (pos mk3 golf)
Posted by: germancarnut51 at 6:47 PM 8-31-2008
95 VWs are OBDI.A standard OBDII code reader is not going to work.
There is supposed to be a shorting tool under the rear seat to plug into the OBD port on the dashboard.
Use it to read the blink codes to figure out what's wrong.
Post Title: Re: mk3 golf bad obd reader (germancarnut51)
Posted by: pos mk3 golf at 7:56 PM 8-31-2008
olways wondered what that thing was for. Pluged it in but all that happens it the CLE just stays lit solid then when i un plug it it goes off. Any futher help. Ps IM not good with vw's but 2nd gen honda civics is my specialtie. 
Post Title:
Posted by: germancarnut51 at 1:01 AM 9-1-2008
I just got a Bentley MKIII Manual this past Friday from another Voortex Member, and it is the only place that I have ever seen any mention of the tool being under the rear seat, or how to use it. I bought the Owner's Manual Set about a month ago from an eBay Seller, and now I need to go back through the Maintenance Book to see if there is any information about the tool, it's location or how to use it.The Bentley Manual tells how to use the tool, and how to use a wire to connect two of the terminal in the diagnostic port for a specific amount of time to active the blink fault messages if you don't have the VW handheld Diagnostic Tool.
Post Title: Re: (germancarnut51)
Posted by: pos mk3 golf at 4:27 PM 9-1-2008
great hopefully u can figure that out for me. Im thinking that i just need a new comp cuz my friend had a cavy that wouldnt flash the codes he replaced the ecu and al his probs went away..... altho im sure it dont help that the ecu is on the out side of the car under the rain shield. well hopefully u find somthin for me. and thanks for the help.
Post Title: Re: (pos mk3 golf)
Posted by: greyhare at 5:27 PM 9-1-2008
To display blink codes:Key on engine off
1) Insert jumper in diagnostic connector for ~2.5sec then remove.
2) After one blink the first digit of the code will blink ~1sec pause, digit 2, etc...
(2-1-1-1 will always be displayed. The ECU only reads the engine speed sensor when the engine is running.)
3)After the first DTC has been displayed, reconnect the jumper for ~2.5sec then remove it. The next code will display.
4) Repeat step 3 untill there are no more codes. (4 long blinks(0-0-0-0))
5) when all codes have been displayed and writen down turn key off.
To erase DTC memory:
1) Connect jumper.
2) Key on but do not start engine.
3) Leave jumper connected for at least 5sec then remove.
4) Reconnect jumper for 2.5sec then remove.
5) The first blink code will display.
6) Repeat step 4 untill all codes have been displayed (0-0-0-0) (All codes must be displayed for memory to erase.)
7) Reconnect jumper for 2.5sec then remove. DTC memory is now erased.
8) Key off.
Post Title: Re: mk3 golf bad obd reader (pos mk3 golf)
Posted by: germancarnut51 at 2:27 AM 9-3-2008
If you don;t have any luck readig the blink codes, there are some sellers on eBay with VW Specific OBDI Readers. I am thinking about getting one myself. There is a blue colored one for about $40, plus $20 shipping that looks like it will work.
Post Title: Re: mk3 golf bad obd reader (germancarnut51)
Posted by: pos mk3 golf at 4:21 PM 9-3-2008
i think im just going to put an ejecto seat in the car and drive it off a bridge..... or just get an ecu out of the salvage yard for $20 and see what happens. thanks for all the help... Thinking next time ill just stick with honda. 
Post Title: Re: mk3 golf bad obd reader (germancarnut51)
Posted by: Blackout JettaIII at 9:57 PM 9-3-2008
do you have a picture of that tool or know where I can get that tool? I have the same problem and need to see the flash codes. I looked under the back seat and did not see anything besideds two controlers.
Post Title:
Posted by: horan116 at 12:40 AM 9-4-2008
A picture would be very helpful
Post Title: Re: mk3 golf bad obd reader (Blackout JettaIII)
Posted by: germancarnut51 at 1:13 AM 9-4-2008
Here is the eBay Auction Number (#330259236133) for a diagnostic handheld tool that the Seller advertises for use with 1990-2007 VWs, Audis, and Skodas.Is supposed to work with OBDI, OBDII, and CAN-BUS based auto systems.
$39.99, plus $19.99 for shipping. Includes the connectors for Pre-95 2 X 2 diagnostic ports, and the 16-pin connector used by OBD1, OBDII and CAN systems.
If you just want the Blink Tool thing supplied originally by VW that was supposed to be under the rear seat, try a VW Dealer.
Post Title: Re: mk3 golf bad obd reader (germancarnut51)
Posted by: pos mk3 golf at 6:41 PM 9-4-2008
or u can just use a pice of wire and plug it into hole 4 and 14 i think ill check to makesure of what holes but just a wire will work if u dont have the tool.
Post Title: Re: mk3 golf bad obd reader (pos mk3 golf)
Posted by: pos mk3 golf at 6:43 PM 9-4-2008
replacing cap, rotor, plug wires and fule filter maby ill keep the car afire all
Post Title: Re: mk3 golf bad obd reader (pos mk3 golf)
Posted by: Blackout JettaIII at 9:56 PM 9-8-2008
Just double checking, so I run a jumpper wire from pin 4- 14 and this will do the same as the special tool from the back seat? Is the upper left the number one pin or is the upper right?
Post Title: Re: mk3 golf bad obd reader (Blackout JettaIII)
Posted by: pos mk3 golf at 5:24 PM 9-9-2008
ok i lied its hole 4 and 15 Start @ the top left of the port. 1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
these aer the ports the tool jumps. Mine wont flash its codes but i think the ecu is bad. 
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