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Thread: 2002 vw cabrio wont start unless accelerator pressed

  1. #1
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    2002 vw cabrio wont start unless accelerator pressed

    Hello world!

    Bought vcds from ďcascade German partsĒ but havenít verified yet, will do shortly.

    2002 cabrio would not start. No click or anything. Was able to jump the starter from signal to battery and car would start. Bought a Bentley manual and tried to figure out what was wrong. Wiring diagrams helped some but had me chasing a ghost. On a hunch went to the wrecker and picked up a used PNP relay (#175). Started right up! Yay!!!

    Next issue! Starts right up but dies almost immediately. Like start and 1500rpm for a second then dies. Doesnít sputter or anything almost like loss of spark. I found that once it starts if I give it 2 quick 1/2 second mashes on the accelerator it will rev up and idle down and stay running after that. This only on cold start. Once itís warmed up I can start it and it will run fine. Give it an hour to cool down and itís back to needing a little bump on the accelerator to start and keep it running. Itís literally two quick vrooms and it settles down to 1000 rpms and stays there.

    Things I have checked
    Vcds vag hex v2
    Had a ton of codes but car had been sitting for 2 years WITH battery plugged in so I just cleared everything. Now shows an airbag sensor code01221 but I think I just need a new sensor.

    Full disclosure - car had plugged body drain holes and drivers side floorboard had 2Ē water in it according to previous owner. I found the drain holes and cleared and A LOT of water came out. I think this is sorted now and hoping as long as I keep the drains clear it is dried and will stay that way.

    I also
    - did a TBA using vcds basic settings.
    - replaced fuel filter
    - Checked fuel pressure at rail both psi (fpr vacuum hose connected and disconnected) matched Bentley numbers
    - Looks like coil is newer as itís not dirty like everything else in the engine bay but maybe the culprit?
    - Checked ecu connectors look clean and dry in/out
    - Checked and cleaned grounds
    ○ Under batter
    ○ On front of block
    ○ Right by ecu
    ○ On rear valve cover ( was very loose) removed cleaned and reinstalled. This is where a ground strap connects directly to coil.
    - Distributer cap and rotor
    ○ Had quite a bit of buildup on the brass. I cleaned them up with sandpaper and have a new one and rotor on order
    - Pulled the easy to get to spark plugs. They look pretty bad but are platinum ones and I can see the electrical path and looks clean enough for running.

    I am going to replace the plugs and wires but pretty sure this is not the issue as once I give it a couple vrooms it seems to run fine. It almost makes me think something is losing power and cutting spark.

    Could be immo issue but no vcds codes are showing for that. Car does not seem to have an immo icon on cluster at all but def have a chipped key and the ring around ignition switch.

    Can someone give me an idea of what graphs or measurements or whatnot I should use in the vcds to get some more info or an idea of what the issue might be?

  2. #2
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    Please could you post a scan of the car to give us an idea of what it’s got, my signature will help explain how to run one if you’re new to it

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  4. #3
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    this was from the initial autoscan. I didnt want to mention the immo code as it hasnt came back since clearing it.

    Also I must haved saved wrong as my output does not look like the example in your signature. camping now so not able to get at the car to run another scan until tomorrow.

    Code:
    Friday,26,June,2020,16:10:23:48304
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 20.4.1.0 (x64)  HEX-V2 CB: 0.4508.4
    Data version: 20200331 DS317.0
    www.Ross-Tech.com
    
    
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: XX (1V - VW Golf Cabriolet (1997 > 2002))
    Scan: 01 02 03 08 15 25 35 56
     
    VIN: XXXXXXXXXXXXXXXXX   
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 037-906-018-ABA.lbl
       Part No: 037 906 018 H
       Component: 2.0l R4/2V  MOTR AT V04  
       Coding: 00003
       Shop #: WSC 00066  
       VCID: 1A6DD725858472DBBDF-4B7A
    
    No fault code found.
    Readiness: 0110 1101
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
       Part No: 1C0 909 605 
       Component: 0H AIRBAG VW51      0004  
       Coding: 12360
       Shop #: WSC 00066  
       VCID: 619FA0C9E85261033C5-4B5C
    
    7 Faults Found:
    00532 - Supply Voltage B+ 
                07-10 - Signal too Low - Intermittent
    01221 - Crash Sensor Side Airbag; Driver Side (G179) 
                29-10 - Short to Ground - Intermittent
    01221 - Crash Sensor Side Airbag; Driver Side (G179) 
                28-00 - Short to Plus
    00591 - Seat Belt Switch; Driver (E24) 
                32-00 - Resistance Too High
    00592 - Seat Belt Switch; Passenger (E25) 
                32-10 - Resistance Too High - Intermittent
    01217 - Side Airbag Igniter; Driver Side (N199) 
                32-00 - Resistance Too High
    01218 - Side Airbag Igniter; Passenger Side (N200) 
                32-10 - Resistance Too High - Intermittent
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 6X0-953-257.lbl
       Part No: 6X0 953 257 
       Component: IMMO                0008  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 7DA7FCB974EAA5E338D-4B00
       XXXXXXXXXXXXXXXXX     VWZ1Z0B1979704
    
    No fault code found.
    
    End----------(Elapsed Time: 01:34, VBatt start/end: 13.1V/13.4V)-----------

  5. #4
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    Here is the code from today. I couldnt do an autoscan, had to set the dropdown to "1V" which matches my vin. Is there a reason why "Auto trans" shows on this output and not in the first one?

    Code:
    Wednesday,01,July,2020,12:44:06:48304
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 20.4.1.0 (x64)  HEX-V2 CB: 0.4508.4
    Data version: 20200331 DS317.0
    www.Ross-Tech.com
    
    
    
    
    
    --------------------------------------------------------------------------------
    --------------------------------------------------------------------------------
    
    
    Chassis Type: XX (1V - VW Golf Cabriolet (1997 > 2002))
    Scan: 01 02 03 08 15 25 35 56
     
    VIN: XXXXXXXXXXXXXXXXX   
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 037-906-018-ABA.lbl
       Part No: 037 906 018 H
       Component: 2.0l R4/2V  MOTR AT V04  
       Coding: 00003
       Shop #: WSC 00066  
       VCID: 1A6DD725858472DBBDF-4B7A
    
    No fault code found.
    Readiness: 0110 1101
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01M-927-733.lbl
       Part No: 01M 927 733 LA
       Component: AG4 Getriebe 01M    4970  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 7AADF7A565C492DB1DF-0964
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 3A0-907-379.lbl
       Part No: 3A0 907 379 D
       Component: ABS     ITTAE 20 GI V00  
       Coding: 03704
       Shop #: WSC 00000  
       VCID: 2B0302E1DA1EFB53D69-4AC2
    
    1 Fault Found:
    01276 - ABS Hydraulic Pump (V64) 
                16-10 - Signal Outside Specifications - Intermittent
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
       Part No: 1C0 909 605 
       Component: 0H AIRBAG VW51      0004  
       Coding: 12360
       Shop #: WSC 00066  
       VCID: 619FA0C9E85261033C5-4B5C
    
    2 Faults Found:
    01221 - Crash Sensor Side Airbag; Driver Side (G179) 
                29-00 - Short to Ground
    01221 - Crash Sensor Side Airbag; Driver Side (G179) 
                28-00 - Short to Plus
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 6X0-953-257.lbl
       Part No: 6X0 953 257 
       Component: IMMO                0008  
       Coding: 00001
       Shop #: WSC 00000  
       VCID: 7DA7FCB974EAA5E338D-4B1E
       XXXXXXXXXXXXXXXXX     VWZ1Z0B1979704
    
    No fault code found.
    
    End----(Elapsed Time: 02:00, VBatt start/end: 12.0V/12.0V. VIgn 12.0V)-----

  6. #5
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    It should show all the modules installed on the car and now it’s picked up auto-trans. It’s still missing others therefore I suspect damaged wiring and water ingress may be the cause.

    I’d recommend testing the wiring for continuity. If the wires are good then it’s likely going to be the modules.

  7. #6
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    Well this car definetley has seen its share of water. The previous owner let the holes under the rocker panels get clogged and according to him the "drivers side floor had 2" of water in it". After i tore up the carpet and underlayment I threw it in the trash. Popped the body plugs and while most were dry the one under where the clutch would be gushed several gallons of water when i opened it. This was before i cleared out the drains under the rockers. I think this plug was for the same cavity.

    I believe the water was confined to that area although it was there for a while and condensation could make its way anywhere in there. I believe it is totally dry now, I can see where the water was and was not. As far as i can tell none got up behind the dash or on the TCU under the rear seat or the ECU up front. All the above mentioned parts seem to be dry and do not show any sign of ever having water on them.

    Having said all that i bought this car for $100 and really havent put anything into it. I dont think im ready to call it a lost cause yet as it is a really straight car with a good top. The engine seems to run pretty well after i get it started.

    Can you give me an example of what should be there but is missing? Should there be a cluster in the code? The cluster seems to work 100% all lights, tach and other readings show what they should.

  8. #7
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    Actually looking at ross-tech website
    https://www.ross-tech.com/vag-com/ca...tlecabrio.html

    The only things I am missing would be
    33 - Generic OBD-ii
    35 - Central locks
    56 - Radio

    Car had an aftermarket radio so thats prob why that isnt showing.

    35 - central locks. It came with a VW key/fob key and door locks all work from it. Not sure if this should be showing but they are working

    33 - Generic OBD-II This does not show up in my code but I think it is working. Before i bought vcds i used my obdii reader and it connected and showed a slew of codes. Again, probably not best practice but i just cleared everything as it had been sitting for so long with a dead battery.

  9. #8
    Benevolent Dictator Uwe's Avatar
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    IIRC, the Mk3.5 Cabrio cars still had an Mk.3 central locking system which does not support diagnostics.

    33-Generic OBD-II won't show in a scan. Click the [OBD-II] button on the main screen.

    -Uwe-
    Lock-down of sick people: Quarantine
    Lock-down of healthy people: Tyranny

  10. #9
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    So if that is the case it looks like all my modules are reporting in. It would not surprise me if there was some water damage but Im hoping that all the important ones stayed dry.

    With that being said are there any measurements in the engine section I could use to determine why I have to use the accelerator (vroom vroom 2 times) to keep it running?

    i.e.
    if i get in the car and start it when cold;
    - just turning the key it starts right up, goes to 1500 or so rpms then dies.
    - if i turn the key and when it starts i give it 2 quick mashes on the acc and let off it will come down to a 1000 rpm idle and seem to run fine.


    Again, does not seem like a fuel issue as pressure was tested at 35psi/45psi. I watched the gauge during start and pressure never goes below 35 psi. Also did a leakdown test today and it held at 30 psi after 10 minutes.

    Its almost like turning the key 'off', car does not stumble or miss or diesel, just stops.

    I can post a video or link to video if it helps

  11. #10
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    Minor update. I put some fuel injector cleaner in the tank, ran it for 15 mins or so and didnt work on it for a few days. When i started it up yesterday it did not have the dying issue. I thought, problem solved! Unfortunately, not gonna be that easy.

    Today I took the car out for a drive (still havent got tags so had the wife follow me). I drove it about about 2 miles or so and it ran great, really great.

    Then when driving i noticed a loss of power, I was driving around town so havent been over 40mph yet. When i would slow down for a stop light it would chug a little but stay running, however, when i would press the accelerator it would almost die. like barely running, could not get over 5mph.

    once in the driveway when in park i would press accelerator, if i floor it it would hesitate and then vroom all the way up. If i pressed slightly on the pedal it would bog down and barely run at maybe 300-400 rpms. Sounded terrible.

    No CEL but i did check codes and see the following

    I hate throwing parts at a car but does this mean the MAF is most likely the issue. Also, after seeing this I started the car and unplugged the maf. Runs good with it unplugged and does not have any of the symptoms reported above. What i dont get is how it seemed to run great the first two miles and then all of a sudden ran like crap.

    Any advice would be appreciated.

    Code:
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 037-906-018-ABA.lbl
       Part No: 037 906 018 H
       Component: 2.0l R4/2V  MOTR AT V04  
       Coding: 00003
       Shop #: WSC 00066  
       VCID: 1A6DD725858472DBBDF-4B7A
    
    1 Fault Found:
    16486 - Mass Air Flow Sensor (G70) 
                P0102 - 35-10 - Signal too Low - Intermittent
    Readiness: 0010 0101
    Last edited by Uwe; 07-05-2020 at 05:30 PM. Reason: Fixed CODE tags

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