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TT 2001 VIN # ***** problem is no communication

with any module on system...
TT 2001 VIN # ***** problem is no communication with any module on system I checked fuse 12 battery + 7.5 amps and fuse 7 key on 10 amps also checked data link connector pins 1 key on power and 16 battery full time all good pins 4and5 ground
on both so could it be and open on DLC pin 7 grey/white wire to modules my scanner be looking for all modules but can't fine none any ideas welcome thanks guys
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Answered in 8 minutes by:
7/31/2015
Kevin
Kevin, Technician
Category: Audi
Satisfied Customers: 2,957
Experience: Diagnostic technician vw/ audi specialist
Verified
Hi I'm Kevin this is the pin uses and what each pin uses on your car you will need pin 4+5 to be earthed
And 16 to be battery voltage which is what you have this should be enough to give you power the other lines will need to be tested with a scope to test signal as multimeter wont show signal I suspect it may be a fault with scanner do you have another car you car try it on
Pin Signal Description
2 J1850 Bus+
4 CGND Chassis ground
5 SGND Signal ground
6 CAN High J-2284
7 K-LINE (ISO 9141-2 and ISO/DIS 14230-4)
10 J1850 Bus-
14 CAN Low J-2284
15 ISO 9141-2 L-LINE (ISO 9141-2 and ISO/DIS 14230-4)
16 +12v Battery power
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Customer reply replied 2 years ago
I think about 7 or 8 scanners have been tested before mine on this car
I can communicate with mine with MB's BMW's VWs so my scanner is fine
Ok you will need to oscilloscope to test comms lines as the data that comes out means nothing just shows activity
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Customer reply replied 2 years ago
can you get me a diagram for data line to check system please
my diagram only shows pins 1-16 power pins 4-5 grounds and pin 7 grey/white line as buss line
I see you have better info
also can a faulty module cause break down of comm. line ?
thanks bud
Pin 7 is comms line that your after on this model it goes to pin 27 on instrument cluster check continuity with dash disconnected the info through k line will mean nothing just needs to be activity on scope but if line tests good it may very well be a dash failure and yes sometimes you can bet a module that goes into overdrive contesting comms lines with bad info inhibiting comms but it's very unlikely to occur on k line comms please remember to rate my service
Kevin
Kevin, Technician
Category: Audi
Satisfied Customers: 2,957
Experience: Diagnostic technician vw/ audi specialist
Verified
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