03 TT Headache

   #21  

rsdubb

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Don’t put effort in that airbag for now. This is 2003 car, not 2025.
Copy that! I didnt know if that might be the module causing the communication issues. If that is for sure a non-issue, thats one thing I can cross off the list. Im digging into the wiring diagram for the power relal while battery is charging. It is in a storage unit costing me $185/mo. I need to get it out of there. I bring battery home to charge then take it back as there is no power available for a maintainer.
 
   #22  

rsdubb

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I did not mention before that EPC light is on dash. I am really new to this discussing diagnostics in a forum. It looks like Ive turned this thread into a cluster diddle. Thank you everyone for your input!!! I am trying to get pertinent info into thread as I recall it. Thank you for your patience. The voltages I spoke of at fuse block locations 28,32,34 and 43. are only between 1-3 volts. voltage to fuel pump is the same. Fuse #28. I dont know if this is of any importance. Just seems to be off. fuel pump voltage I thought should be battery voltage at fuse 28.
 
   #23  

rsdubb

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Don’t put effort in that airbag for now. This is 2003 car, not 2
Wiring diagrams hurt my head lol! Does anyone want to buy an 03 TT Roadster ....cheap?
 
   #24  

EuroX

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I did not mention before that EPC light is on dash. I am really new to this discussing diagnostics in a forum. It looks like Ive turned this thread into a cluster diddle. Thank you everyone for your input!!! I am trying to get pertinent info into thread as I recall it. Thank you for your patience. The voltages I spoke of at fuse block locations 28,32,34 and 43. are only between 1-3 volts. voltage to fuel pump is the same. Fuse #28. I dont know if this is of any importance. Just seems to be off. fuel pump voltage I thought should be battery voltage at fuse 28.
Are we sure multimeter is set to DC voltage? If the battery is fully charged you should have 12v on all those fuses with ignition on. Unless relays are not latching. Have you verified the strip fuses on the top of the battery are ok. This was a common issue on 1st gen audi tt's and mk4 vehicles from those years.That being said if you do indeed have 1-3volts instead of 12v I would say you have a wiring issue or corroded wire somewhere possibly with high resistance. Note fuse 28 is only powered if ecm latches both power supply relays IIRC.
 
   #25  

rsdubb

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I am not getting that feeling that testing is done right. Testing is not parts swapping.

Where is the feed for the ecm relay coil coming from, point location, plug and terminal, where is the ground for the ecm relay coming from, point location, plug, terminal, as applicable.

Answering to the point could lead you to a faster fix.
There is a relay in engine compartment and another in footwell under dash. Both relay are working properly
Are we sure multimeter is set to DC voltage? If the battery is fully charged you should have 12v on all those fuses with ignition on. Unless relays are not latching. Have you verified the strip fuses on the top of the battery are ok. This was a common issue on 1st gen audi tt's and mk4 vehicles from those years.That being said if you do indeed have 1-3volts instead of 12v I would say you have a wiring issue or corroded wire somewhere possibly with high resistance. Note fuse 28 is only powered if ecm latches both power supply relays IIRC.
Are we sure multimeter is set to DC voltage? If the battery is charged you should have 12v on all those fuses with ignition on. Unless relays are not latching. Have you verified the strip fuses on the top of the battery are ok. This was a common issue on 1st gen audi tt's and mk4 vehicles from those years.That being said if you do indeed have 1-3volts instead of 12v I would say you have a wiring issue or corroded wire somewhere possibly with high resistance. Note fuse 28 is only powered if ecm latches both power supply relays IIRC.
Yes, both relays are functioning properly. I am using an Autel PS100 power probe.Under the dash at micro central electrical panel, the blue wire is only energized w/2ish volts. It just so happens that post is what energizes the fuses I mentioned.
 
   #26  

rsdubb

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There is a relay in engine compartment and another in footwell under dash. Both relay are working properly


Yes, both relays are functioning properly. I am using an Autel PS100 power probe.Under the dash at micro central electrical panel, the blue wire is only energized w/2ish volts. It just so happens that post is what energizes the fuses I mentioned.
All of the fuses at top of battery are intact as well
 
   #27  

RGH0

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Don’t put effort in that airbag for now. This is 2003 car, not 2025.
The crash indicator is not a signficant problem for now as you say but it is an indicator of probably why there are so many problems. A crash and some poor repairs combined with years of wet storage and you have the type of issues seen. No easy fix but just need to work from wire to wire and module to module in a systemmatic way to eliminate the faults progressively. Start with the stuff that stops the car running
 
   #28  

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At this stage, we still cannot prove a relay ….
 
   #29  

Dr Sheldon

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Wiring diagrams hurt my head lol!

Then you will struggle to fix this !!

I am convinced you have not checked those relays !! further convinced you do not know how !!
There is a relay in engine compartment and another in footwell under dash. Both relay are working properly

Here you claim that you do !! I am not so sure !!
 
   #30  

rsdubb

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Here is a fresh scan.

Code:
Sunday,12,January,2025,15:38:49:65378
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.7.1.0 (x64)  HEX-NET2 CB: 0.4643.5
Data version: 20240919 DS356.3
www.Ross-Tech.com


VIN: TRUUT28N231019349   License Plate:
Mileage:    Repair Order: 01/12/2025



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8N (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: TRUUT28N231019349  
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-BEA.clb
   Part No: 8N0 906 018 BB
   Component: 1.8L R4/5VT     G   0003 
   Coding: 07710
   Shop #: WSC 01236 
   VCID: 72B6A9A39DB0D7BA59F-513C
   TRUUT28N231019349     AUZ5Z0C2116115

5 Faults Found:
18010 - Power Supply Terminal 30
            P1602 - 35-00 - Voltage too Low
17862 - Exhaust Gas Temp Sensor 1 (G235)
            P1454 - 35-10 - Short to Ground - Intermittent
17069 - ECM Power Relay Control Circuit
            P0685 - 35-10 - Open Circuit - Intermittent
17766 - Cylinder 2 Ignition Circuit
            P1358 - 35-10 - Open Circuit - Intermittent
16727 - Camshaft Position Sensor (G40)
            P0343 - 35-10 - Signal too High - Intermittent
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 8N0-907-379-MK60-A.lbl
   Part No: 8N0 907 379 H
   Component: ESP ALLRAD MK60     0101 
   Coding: 0022544
   Shop #: WSC 01236 785 00200
   VCID: 41D4366FED963C22105-513C

5 Faults Found:
01314 - Engine Control Module
            013 - Check DTC Memory - Intermittent
65534 - Unknown Error Code
            015 - Cannot Be Tested at this Time - MIL ON
01314 - Engine Control Module
            004 - No Signal/Communication - Intermittent
00778 - Steering Angle Sensor (G85)
            003 - Mechanical Failure
65534 - Unknown Error Code
            015 - Cannot Be Tested at this Time - MIL ON

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03 
   Coding: 00140
   Shop #: WSC 01236 
   VCID: 28028BCB6BECED6A37B-2580

2 Faults Found:
00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
            30-10 - Open or Short to Plus - Intermittent
01273 - Fresh Air Blower (V2)
            17-10 - Control Difference - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N0-959-655.lbl
   Part No: 8N0 959 655 B
   Component: Airbag Front+Seite 6000 
   Coding: 01103
   Shop #: WSC 01236 
   VCID: 3FD030979E624AD2661-513C

2 Faults Found:
01228 - Airbag Cut-Off Switch for Passenger Side (E224)
            30-10 - Open or Short to Plus - Intermittent
00532 - Supply Voltage B+
            07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N1 920 980 E
   Component: KOMBI+WEGFAHRS. M73 D14 
   Coding: 07244
   Shop #: WSC 26105 
   VCID: 38225B8BBB4C7DEAA7B-4B00
   TRUUT28N231019349     AUZ5Z0C2116115

6 Faults Found:
00771 - Fuel Level Sensor (G)
            30-10 - Open or Short to Plus - Intermittent
00667 - Ambient Temperature Signal
            30-10 - Open or Short to Plus - Intermittent
00668 - Supply Voltage Terminal 30
            53-10 - Supply Voltage Too Low - Intermittent
01314 - Engine Control Module
            49-10 - No Communications - Intermittent
01304 - Radio
            49-10 - No Communications - Intermittent
01305 - Databus for Infotainment
            37-10 - Faulty - Intermittent

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 C
   Component: HALDEX LSC  ECC     0010 
   VCID: 201293EB03DC152A7FB-4B00

2 Faults Found:
00526 - Brake Light Switch (F)
            27-00 - Implausible Signal
01314 - Engine Control Module
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8Nx-962-267.clb
   Part No: 8N7 962 267 F
   Component: Central Lock/Alarm  D09 
   Coding: 15900
   Shop #: WSC 26105 
   VCID: 43D83C67F28A2E32029-4F2E

6 Faults Found:
01366 - Opened Due to Crash Signal
            35-00 - -
01374 - Alarm triggered by Terminal 15
            35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
            35-00 - -
01616 - Signal Wire to Interior Monitor
            36-10 - Open Circuit - Intermittent
00955 - Key 1
            09-00 - Adaptation Limit Surpassed
01559 - Drivers Door
            58-00 - Can't Lock

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357
   Component: LEUCHTWEITEREGLER  D004 
   Coding: 00010
   Shop #: WSC 01236 
   VCID: 659CC2FF5C7E3002CCD-5184

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
   Part No: 4B0 035 186 H
   Component: concert II  NP2    0050  
   Coding: 00202
   Shop #: WSC 00000 
   VCID: 251C82FF1CFEF0020CD-4E40

1 Fault Found:
00857 - CD Changer Unit (R41)
            49-00 - No Communications

End----------(Elapsed Time: 02:46, VBatt start/end: 12.3V/12.2V)-----------
 
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   #31  

TTT

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What for? The ecm relay control circuit is still not right.
 
   #32  

rsdubb

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Well isnt that special!!! I looked at fresh scan.decided to start disconecting modules that said no communication. I disconnect brake controller and it fired!! Woo hoo
 
   #33  

rsdubb

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Then you will struggle to fix this !!

I am convinced you have not checked those relays !! further convinced you do not know how !!


Here you claim that you do !! I am not so sure !!
looks like I didnt have such a hard time after. And I do infact know how relays work. Maybe you are not seeing it quite right?
 
   #35  

rsdubb

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Get yourself wiring diagrams and focus on ecm power relay. Learn from online videos what a relay does and how to test it and it’s associated wiring.
Thank you for your help sir!!! I appreciate you!!
 
   #36  

TTT

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Thank you for your help sir!!
I’m trying but still failing. My rule is to stick to one fault and possible that will lead to fixing all. I don’t think you’re out of the woods yet.
 
   #37  

rsdubb

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So I cleared codes and scanned again. Here is what im left with. I have the air box out so MAF is not present among other things. I will need to sort out my brake controller issue but that is a massive portion of the haystack removed. Got alot to do but got alot done narrowing it down.

Code:
Sunday,12,January,2025,16:19:38:65378
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 24.7.1.0 (x64)  HEX-NET2 CB: 0.4643.5
Data version: 20240919 DS356.3
www.Ross-Tech.com


VIN: TRUUT28N231019349   License Plate:
Mileage:    Repair Order: post run



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8N (8N - Audi TT (1999 > 2007))
Scan: 01 02 03 08 15 17 22 35 37 45 55 56 76 77
 
VIN: TRUUT28N231019349  
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-BEA.clb
   Part No: 8N0 906 018 BB
   Component: 1.8L R4/5VT     G   0003 
   Coding: 07710
   Shop #: WSC 01236 
   VCID: 72B6A9A39DB0D7BA59F-513C
   VINID: 92296590221E0830400490C424D0E42CB1
   TRUUT28N231019349     AUZ5Z0C2116115

1 Fault Found:
18057 - Powertrain Data Bus
            P1649 - 35-00 - Missing Message from ABS Controller
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 8N0-820-043.lbl
   Part No: 8N0 820 043 A
   Component: TT-KLIMAVOLLAUTOMAT D03 
   Coding: 00140
   Shop #: WSC 01236 
   VCID: 28028BCB6BECED6A37B-2580

2 Faults Found:
00604 - Potentiometer Positioning Motor for Air Flow Flap (G113)
            30-10 - Open or Short to Plus - Intermittent
01273 - Fresh Air Blower (V2)
            17-10 - Control Difference - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 8N0-959-655.lbl
   Part No: 8N0 959 655 B
   Component: Airbag Front+Seite 6000 
   Coding: 01103
   Shop #: WSC 01236 
   VCID: 3FD030979E624AD2661-513C

2 Faults Found:
01228 - Airbag Cut-Off Switch for Passenger Side (E224)
            30-10 - Open or Short to Plus - Intermittent
00532 - Supply Voltage B+
            07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 8Nx-920-xxx-17.lbl
   Part No: 8N1 920 980 E
   Component: KOMBI+WEGFAHRS. M73 D14 
   Coding: 07244
   Shop #: WSC 26105 
   VCID: 38225B8BBB4C7DEAA7B-4B00
   TRUUT28N231019349     AUZ5Z0C2116115

No fault code found.

-------------------------------------------------------------------------------
Address 22: AWD        Labels: 02D-900-554.lbl
   Part No: 02D 900 554 C
   Component: HALDEX LSC  ECC     0010 
   VCID: 201293EB03DC152A7FB-4B00

3 Faults Found:
00526 - Brake Light Switch (F)
            27-00 - Implausible Signal
01316 - ABS Control Module
            49-00 - No Communications
01314 - Engine Control Module
            49-00 - No Communications

-------------------------------------------------------------------------------
Address 35: Centr. Locks        Labels:. 8Nx-962-267.clb
   Part No: 8N7 962 267 F
   Component: Central Lock/Alarm  D09 
   Coding: 15900
   Shop #: WSC 26105 
   VCID: 43D83C67F28A2E32029-4F2E

6 Faults Found:
01366 - Opened Due to Crash Signal
            35-00 - -
01374 - Alarm triggered by Terminal 15
            35-00 - -
01368 - Alarm triggered by Luggage Compartment Switch
            35-00 - -
01616 - Signal Wire to Interior Monitor
            36-10 - Open Circuit - Intermittent
00955 - Key 1
            09-00 - Adaptation Limit Surpassed
01559 - Drivers Door
            58-00 - Can't Lock

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4B0-907-357-AUT.lbl
   Part No: 4B0 907 357
   Component: LEUCHTWEITEREGLER  D004 
   Coding: 00010
   Shop #: WSC 01236 
   VCID: 659CC2FF5C7E3002CCD-5184

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 8E0-035-1xx-56.lbl
   Part No: 4B0 035 186 H
   Component: concert II  NP2    0050  
   Coding: 00202
   Shop #: WSC 00000 
   VCID: 251C82FF1CFEF0020CD-4E40

1 Fault Found:
00857 - CD Changer Unit (R41)
            49-00 - No Communications

End----------(Elapsed Time: 02:52, VBatt start/end: 12.3V/12.3V)
 
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   #38  

rsdubb

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Then you will struggle to fix this !!

I am convinced you have not checked those relays !! further convinced you do not know how !!


Here you claim that you do !! I am not so sure !!
well a relay uses lower voltage to close a gate completing a circuit usually of a higher load. So if i put an ohm meter on the circuit that is being relayed and supply proper power to the slave circuit I will have continuity. Just a wild guess. You have a special way of communicating with people that is very condescending. Have a wonderful day
 
   #39  

TTT

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That ecm relay is not using a lower voltage. Just saying. It is true on hybrid and electric vehicles, but trust me, you ( I mean you) don’t get a chance to be messing with it, it is well burried.
 
   #40  

rsdubb

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That ecm relay is not using a lower voltage. Just saying. It is true on hybrid and electric vehicles, but trust me, you ( I mean you) don’t get a chance to be messing with it, it is well burried.
I did not look to see if the voltage going to 28,32,34 and 39 has gone up from the 2+volts it was showing before I removed ABS controller. I will check it tomorrow. I imagine it had to change and go up otherwise the fuel pump would not have primed properly to start the vehicle. Ill let you know after I check it out.
Ok I will go along with that. How about a lower amperage. Usually that is, not always. I agree. The slave circuit in this case uses running voltage. the ECM relay is buried deep? I already have the ECM out of its home in the firewall behind wiper arms. yes it was buried in there pretty good. That was my first thought. That the ECM was fried or corrupted. I will dig into the ABS module tomorrow and get that sorted. Did you happen to notice the new scan?
 
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