Public-domain OBD1 PCB board - ORDER HERE
10-05-2006, 04:03 PM
#241
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Chris,
I'll send you an e-mail later tonight, but I'm looking for at least one board, likely two.
I need one for a '95 VW OBD-1 car, and one for my '96 993 which is OBD-2.
If the two connectors can be applied to the same board then you can upcharge me for it. And any case would be fine by me... whatever you plan works.
Thanks!
I'll send you an e-mail later tonight, but I'm looking for at least one board, likely two.
I need one for a '95 VW OBD-1 car, and one for my '96 993 which is OBD-2.
If the two connectors can be applied to the same board then you can upcharge me for it. And any case would be fine by me... whatever you plan works.
Thanks!
10-05-2006, 04:38 PM
#242
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Hi Chris,
I'd like an assembled unit in a generic plastic box. My car has the rectangular/trapezoidal OBDI connector. Please let me know where to send $$ and how much. I'm also emailing you directly.
I'd like an assembled unit in a generic plastic box. My car has the rectangular/trapezoidal OBDI connector. Please let me know where to send $$ and how much. I'm also emailing you directly.
10-05-2006, 07:39 PM
#244
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Just remember, folks... if you have a 95 with the RadioControlled Drive Block/Alarm... you will NOT be able to access the airbag or motronic stuff with this gear! While it's nice to be able to access the Alarm, Climate Control, and ABS codes... it's not the whole enchilada.
Thaddeus
Thaddeus
10-05-2006, 08:26 PM
#245
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Originally Posted by Thaddeus
Just remember, folks... if you have a 95 with the RadioControlled Drive Block/Alarm... you will NOT be able to access the airbag or motronic stuff with this gear!
Thaddeus
Thaddeus
I don't think that's quite right. The alarm has to be disabled properly for you to pick up the Motronic signals at the OBD port. I don't have this issue on my car so I haven't bookmarked it, but it's worth a search. Have you tried following up on Ray's advice from the last page?
raycm said:
As I suggested the first message I wrote, you should read the OBD1 thread.
A couple of persons had the issue with this style alarm. It prevented the Motronic from talking over the OBD interface. There is discussion of the wiring from Motronic through the alarm then to the OBD connector. You may think the alarm is disabled but it isn't unless you disable it properly. I don't have this style alarm. Mine is engaged and disengaged by turning the key in the door. i.e. I don't know the exact procedure for the RF alarm.
As I suggested the first message I wrote, you should read the OBD1 thread.
A couple of persons had the issue with this style alarm. It prevented the Motronic from talking over the OBD interface. There is discussion of the wiring from Motronic through the alarm then to the OBD connector. You may think the alarm is disabled but it isn't unless you disable it properly. I don't have this style alarm. Mine is engaged and disengaged by turning the key in the door. i.e. I don't know the exact procedure for the RF alarm.
10-05-2006, 10:27 PM
#246
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Originally Posted by cowtown
Thaddeus,
I don't think that's quite right. The alarm has to be disabled properly for you to pick up the Motronic signals at the OBD port. I don't have this issue on my car so I haven't bookmarked it, but it's worth a search. Have you tried following up on Ray's advice from the last page?
I don't think that's quite right. The alarm has to be disabled properly for you to pick up the Motronic signals at the OBD port. I don't have this issue on my car so I haven't bookmarked it, but it's worth a search. Have you tried following up on Ray's advice from the last page?
It's clearly not a simple matter of disabling the alarm with the RF controlled units. I've tried it with key on, key off, engine running, engine off, alarm disabled (signified by the alrm warning light being off)... it's a problem.
10-06-2006, 08:38 AM
#247
Originally Posted by Thaddeus
Yes. Apparently you need to 'jumper' some wires so the signal from Motronic is not blocked by the alarm. I asked which wires need jumpering, but nobody could say... and anyway, I think it a poor idea to cut up the factory harness.
It's clearly not a simple matter of disabling the alarm with the RF controlled units. I've tried it with key on, key off, engine running, engine off, alarm disabled (signified by the alrm warning light being off)... it's a problem.
It's clearly not a simple matter of disabling the alarm with the RF controlled units. I've tried it with key on, key off, engine running, engine off, alarm disabled (signified by the alrm warning light being off)... it's a problem.
Hi, I wrote this in a 993 thread:
Originally Posted by PDriver
...has your car M530 option? Then there is the immobilizer unit installed and
the K-Line from the DME is NOT directly attached to the OBD connector.
The K-Line from the DME is routed to the W-Line Input of the immobilzer unit
and the the K-Line from the immobilizer is routed to the OBD connector.
I have the same problem on my car and the update to the 10k resistor is not
solving the problem. If I shorten the W- and K-Line on the immobilzer I
am able to get a connection with scantool to the DME. So the workaround
is a switch to shorten the two contacts. But I'm search for the real
problem now on the interface...
...
There is a micro signal relais (EA2-6 from NEC) inside the immobilizer,
which is responsible for connecting the incoming K-Line signal from the
motronic to the OBD connector. But the signal for the coil of the relais is
never switching. I think the relais is ok. Because everything else on board
works fine I decided to place a "motronic K-Line" switchover between pin 9
and pin 11 of the immobilizer unit and fix it under the drivers seat.
On next winter there is enough time to do a deeper bug searching...
the K-Line from the DME is NOT directly attached to the OBD connector.
The K-Line from the DME is routed to the W-Line Input of the immobilzer unit
and the the K-Line from the immobilizer is routed to the OBD connector.
I have the same problem on my car and the update to the 10k resistor is not
solving the problem. If I shorten the W- and K-Line on the immobilzer I
am able to get a connection with scantool to the DME. So the workaround
is a switch to shorten the two contacts. But I'm search for the real
problem now on the interface...
...
There is a micro signal relais (EA2-6 from NEC) inside the immobilizer,
which is responsible for connecting the incoming K-Line signal from the
motronic to the OBD connector. But the signal for the coil of the relais is
never switching. I think the relais is ok. Because everything else on board
works fine I decided to place a "motronic K-Line" switchover between pin 9
and pin 11 of the immobilizer unit and fix it under the drivers seat.
On next winter there is enough time to do a deeper bug searching...
added a switch which is connected inside the immobilizer unit between
pin 9 and 11. The switch is placed outside the unit attached to the cover
which is installed over motronic and immobilizer. No cut to the wiring harness
was necessary. For the switch wire routing I used unused hole in the
immobilizer unit.
Opened immobilizer unit with added wiring:
Details pin 9 and 11:
Installed switch on cover (red cap):
Please note: this is only a workaround! I'm the first to remove this switch
from the car if anyone found the right solution and will tell us...
PDriver
10-06-2006, 09:59 AM
#248
Originally Posted by Thaddeus
Just remember, folks... if you have a 95 with the RadioControlled Drive Block/Alarm... you will NOT be able to access the airbag or motronic stuff with this gear! While it's nice to be able to access the Alarm, Climate Control, and ABS codes... it's not the whole enchilada.
Thaddeus
Thaddeus
i know that this has been asked before, but I don't recall seeing a defintitive answer
How do you remove the immobilizer, I hate it on general principles, this info ices it.
10-06-2006, 11:10 AM
#249
"How do you remove the immobilizer, I hate it on general principles, this info ices it."
This doesn't remove the immobilizer (allow starting), but just allows access to the "K" line without
using the remote first. This is the same as on the 996 where the immobilizer controls access
to the K line via the W line. Please give credit to Porsche engineers for NOT being "naive"
in their design.
This doesn't remove the immobilizer (allow starting), but just allows access to the "K" line without
using the remote first. This is the same as on the 996 where the immobilizer controls access
to the K line via the W line. Please give credit to Porsche engineers for NOT being "naive"
in their design.
Last edited by Lorenfb; 10-06-2006 at 11:44 AM.
10-06-2006, 12:42 PM
#251
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Originally Posted by Bill Verburg
Ain't that a kick in the but
Bill, be sure to read #247 for instructions on the workaround. PDriver reads Motronic.
Last edited by cowtown; 10-06-2006 at 01:34 PM.
10-06-2006, 01:05 PM
#253
Originally Posted by cowtown
Bill, be sure to read #247 for instructions on the workaround. PDriver reads Motronic.
10-06-2006, 01:49 PM
#254
"Bill, be sure to read #247 for instructions on the workaround. PDriver reads Motronic." Cowtown
This workaround ONLY allows DIRECT access to the DME K line and does NOT bypass the
immobilizer to start the car. The DME stills needs a data (code) transfer/communication
with the immobilizer to "command" the DME to enter the "run" mode. There're only
two real (actually just one proper one) solutions:
1. '95 55 pin DME - different EPROM chip
2. '96 88 pin DME - no simple solution as no EPROM nor flash memory
3. '97/'98 88 pin DME - a flash reprogramming - generally causes no more
ODBII diagnostics (major problem) - prepare to buy a new one ($1500)
As I said before: "Please give credit to Porsche engineers for NOT being "naive"
in their design.", i.e. to allow such a simple solution to steal a 993.
This workaround ONLY allows DIRECT access to the DME K line and does NOT bypass the
immobilizer to start the car. The DME stills needs a data (code) transfer/communication
with the immobilizer to "command" the DME to enter the "run" mode. There're only
two real (actually just one proper one) solutions:
1. '95 55 pin DME - different EPROM chip
2. '96 88 pin DME - no simple solution as no EPROM nor flash memory
3. '97/'98 88 pin DME - a flash reprogramming - generally causes no more
ODBII diagnostics (major problem) - prepare to buy a new one ($1500)
As I said before: "Please give credit to Porsche engineers for NOT being "naive"
in their design.", i.e. to allow such a simple solution to steal a 993.
Last edited by Lorenfb; 10-06-2006 at 02:10 PM.
10-06-2006, 02:05 PM
#255
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Originally Posted by Lorenfb
"Bill, be sure to read #247 for instructions on the workaround. PDriver reads Motronic." Cowtown
This workaround ONLY allows DIRECT access to the DME K line and does NOT bypass the
immobilizer to start the car. The DME stills needs a data (code) transfer/communication
with the immobilizer to "command" the DME to enter the "run" mode. There're only
two real (actually just one proper one) solutions:
1. '95 55 pin DME - different EPROM chip
2. '96 88 pin DME - no simple solution as no EPROM nor flash memory
3. '97/'98 88 pin DME - a flash reprogramming - generally causes no more
ODBII diagnostics (major problem) - prepare to buy a new one ($1500)
This workaround ONLY allows DIRECT access to the DME K line and does NOT bypass the
immobilizer to start the car. The DME stills needs a data (code) transfer/communication
with the immobilizer to "command" the DME to enter the "run" mode. There're only
two real (actually just one proper one) solutions:
1. '95 55 pin DME - different EPROM chip
2. '96 88 pin DME - no simple solution as no EPROM nor flash memory
3. '97/'98 88 pin DME - a flash reprogramming - generally causes no more
ODBII diagnostics (major problem) - prepare to buy a new one ($1500)
So does the jumper allow one to see and read the DME, as well as clear faults on the DME?