Mk4 New Beetle, unclearable P1579 code

   #1  

bikergeek

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I have a 2001 VW New Beetle. Recently it threw an EPC light and MIL with error codes for the Throttle Position Sensor so I replaced the accelerator pedal assembly with a Hella unit. (It's drive by wire rather than cable if that matters.)

Since then I have this unclearable error:

Code:
17987 - Throttle Actuator (J338)
            P1579 - 35-00 - Adaptation Not Started

It seems to want a throttle body adaptation, but I can't do it without clearing this code. Every time I clear codes, it comes back. I even tried disconnecting the battery for 30 minutes, to no avail.

Driving the car for a bit results in Throttle Position Sensor error codes, and eventually it goes into "limp" mode under which it has next to no power.

Car was in a collision at the beginning of March, but I got it back from the body shop about a month ago and I'd been driving it around with no signs that anything was amiss.

Any suggestions here before I throw in the towel and take it to a repair shop? Thanks.

Auto Scan:
Code:
Monday,16,May,2022,18:01:07:10877
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64(VirtualBox)
VCDS Version 22.3.1.4 (x64)  HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0
www.Ross-Tech.com


Mileage: 231050km-143567mi   Repair Order:



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


Chassis Type: 1C - VW New Beetle (1998 > 2010)
Scan: 01 02 03 08 15 17 19 25 29 35 37 39 46 54 56 65 75

   Mileage: 231050km-143567miles
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-AVH.lbl
   Part No: 06A 906 032 BS
   Component: 2.0l R4/2V      G  *3655
   Coding: 00003
   Shop #: WSC 00066
   VCID: 70B92E7093B1B45B3FF-5161

1 Fault Found:
17987 - Throttle Actuator (J338)
            P1579 - 35-00 - Adaptation Not Started
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01M-927-733.lbl
   Part No: 01M 927 733 JF
   Component: AG4 Getriebe 01M    4719
   Coding: 00000
   Shop #: WSC 00000
   VCID: 7DA70744D4E3C933A49-0963

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1J0-907-37x-ABS.clb
   Part No: 1J0 907 379 P
   Component: ABS     20 IE CAN  0001
   Coding: 03504
   Shop #: WSC 00066
   VCID: 3E25C0489965122BFD3-4B1F

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 6Q0 909 605 A
   Component: 16 AIRBAG VW5  0D   0004
   Coding: 12598
   Shop #: WSC 00066
   VCID: 3537DF64AC53D1732C9-4B3D

1 Fault Found:
01221 - Crash Sensor Side Airbag; Driver Side (G179)
            37-00 - Faulty

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 1C0-920-xx0.lbl
   Part No: 1C0 920 901 X
   Component: KOMBI+WEGFAHRS. M73 V07
   Coding: 03202
   Shop #: WSC 09141
   VCID: 313FEB74583BFD53701-4B1F

   Subsystem 1 - Part No: Ident
   Component: Nr. Wegfahrs.:VWZ5Z0B2142050
   Ident.-Nr. Wegfahrs.:VWZ5Z0B2142050

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.clb
   Part No: 6N0 909 901
   Component: Gateway K<->CAN    V072
   Coding: 00007
   Shop #: WSC 09141
   VCID: 70B92E7093B1B45B3FF-4B1F

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 1J0-959-799.lbl
   Part No: 1J0 959 799 AJ
   Component: 5X Zentral-SG Komf. 0001
   Coding: 00257
   Shop #: WSC 00066
   VCID: 065568A881358AEBF53-4B1F

   Subsystem 1 - Part No: 1J2959802C
   Component: 5X Tõrsteuerger. FS0002r

   Subsystem 2 - Part No: 1J2959801D
   Component: 5X Tõrsteuerger. BF0002r

1 Fault Found:
00953 - Interior Light Time limit
            25-10 - Unknown Switch Condition - Intermittent

End----------(Elapsed Time: 03:39, VBatt start/end: 12.1V/12.1V)-----------
 
   #2  

Uwe

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Driving the car for a bit results in Throttle Position Sensor error codes,
Please post a scan showing those fault codes.

-Uwe-
 
   #3  

Jetta 97

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It is possible that you have bad Throttle body . Why would you replace accelerator pedal assembly when you have DTC for Throttle.
 
   #4  

Crasher

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Why do people remove the VIN and leave us to work out what the engine is for ourselves?
 
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   #5  

Jef

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2001 Beetle won't report the VIN via the data port. That started with 2002 models.

Why did you replace the accelerator pedal? :confused:

01-08-062 will show throttle valve and accelerator pedal data. You can view this with key on, engine off.

Fields 1 and 2 are the throttle body and the sum total of the two values should add up to 100% (+/- 2%) at any give position the throttle valve is opened or closed to.

Fields 3 and 4 are the accelerator pedal and the values will be double / half of each other. Field 3 will be double the value of field 4. Field 4 is half the value of field 3.

So that end, as you operate the accelerator pedal and the throttle valve are you values looking good?
 
   #6  

bikergeek

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Please post a scan showing those fault codes.

-Uwe-

Code:
Tuesday,17,May,2022,12:44:19:10877
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64)  HEX-V2 CB: 0.4615.4
Data version: 20220407 DS337.0
www.Ross-Tech.com


Mileage: 143626   Repair Order:



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


Chassis Type: 9C - VW New Beetle (1999 > 2010)
Scan: 01 02 03 08 15 17 19 25 29 35 37 39 46 54 56 65 75
 
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 06A-906-032-AVH.lbl
   Part No: 06A 906 032 BS
   Component: 2.0l R4/2V      G  *3655 
   Coding: 00003
   Shop #: WSC 00066 
   VCID: 70B92E7093B1B45B3FF-513C

3 Faults Found:
17987 - Throttle Actuator (J338)
            P1579 - 35-00 - Adaptation Not Started
17950 - Angle Sensor 1 for Throttle Actuator (G187)
            P1542 - 35-00 - Implausible Signal
16605 - Angle Sensor 2 for Throttle (G188)
            P0221 - 35-00 - Implausible Signal
Readiness: 0110 1101

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 01M-927-733.lbl
   Part No: 01M 927 733 JF
   Component: AG4 Getriebe 01M    4719 
   Coding: 00000
   Shop #: WSC 00000 
   VCID: 7DA70744D4E3C933A49-0962

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 1J0-907-37x-ABS.clb
   Part No: 1J0 907 379 P
   Component: ABS     20 IE CAN  0001 
   Coding: 03504
   Shop #: WSC 00066 
   VCID: 3E25C0489965122BFD3-4B1E

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
   Part No: 6Q0 909 605 A
   Component: 16 AIRBAG VW5  0D   0004 
   Coding: 12598
   Shop #: WSC 00066 
   VCID: 3537DF64AC53D1732C9-4B3C

1 Fault Found:
01221 - Crash Sensor Side Airbag; Driver Side (G179)
            37-00 - Faulty

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels: 6N0-909-901-19.clb
   Part No: 6N0 909 901
   Component: Gateway K<->CAN    V072 
   Coding: 00007
   Shop #: WSC 09141 
   VCID: 70B92E7093B1B45B3FF-4B1E

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels: 1J0-959-799.lbl
   Part No: 1J0 959 799 AJ
   Component: 5X Zentral-SG Komf. 0001 
   Coding: 00257
   Shop #: WSC 00066 
   VCID: 065568A881358AEBF53-4B1E

   Subsystem 1 - Part No: 1J2959802C
   Component: 5X Tõrsteuerger. FS0002r 

   Subsystem 2 - Part No: 1J2959801D
   Component: 5X Tõrsteuerger. BF0002r 

1 Fault Found:
00953 - Interior Light Time limit
            25-10 - Unknown Switch Condition - Intermittent

End----------(Elapsed Time: 03:39, VBatt start/end: 12.2V/12.1V)-----------
 
   #7  

bikergeek

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It is possible that you have bad Throttle body . Why would you replace accelerator pedal assembly when you have DTC for Throttle.

Throttle body was throwing error codes and was replaced in December. Was working fine.
 
   #8  

Uwe

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Code:
17950 - Angle Sensor 1 for Throttle Actuator (G187)
            P1542 - 35-00 - Implausible Signal
16605 - Angle Sensor 2 for Throttle (G188)
            P0221 - 35-00 - Implausible Signal

If the TB has already been replaced (provenance of the replacement?) I would carefully check and verify all relevant wiring, voltage supply, and ground points.

-Uwe-
 
   #9  

bikergeek

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If the TB has already been replaced (provenance of the replacement?) I would carefully check and verify all relevant wiring, voltage supply, and ground points.

-Uwe-

Replacement TB was a Bosch unit procured from RockAuto. Seems like a quality brand from a reputable supplier to me, unless there's something I don't know about here.
 
   #10  

Crasher

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What is the bugs VIN and the Bosch part number you fitted?
 
   #11  

EuroX

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Sounds like wiring or ecu loosing adaption for throttle body. I can't say I haven't seen that issue before. But I would start with the basic's like wiring.
 
   #12  

vwtech

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Here is Humble explaining the basic problem.
Most of this is for new models but it is the same for older ones. Even the TSB connector is the same.
Just not as much info on older then the newer one's.


This is a guy testing it right. Humble just explains the problem.

Good Luck
 
   #13  

JMR

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Make sure you do the adaptation after the engine reaches at least 60 degrees. Tell us if the fourth field ahows adp ok or error after you do it.
 
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   #14  

bikergeek

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Okay, so, just to provide an update on this.

After reading the advice here that it might be a wiring issue I went out and checked the connection to the throttle body. Seemed tight enough but I wiggled it a bit. Then I plugged VCDS back in and got a *different* fault code, one for "Throttle Body: Low Voltage During Basic Settings: Intermittent", and the other codes that I listed earlier were gone. I was then able to clear the "Low Voltage" code, and was able to do a successful throttle body adaptation (got "ADP OK"). I road-tested the vehicle and the EPC and MIL did not come back. After driving the car around for the second half of last week, including two trips in to the office about 15 miles away from my home, I've put about 150 miles on the car and the MIL and EPC remain off. Plugged VCDS in just now and no trouble codes are stored.

Thanks for the help, everyone.
 
   #15  

vwtech

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Okay so you figured out where the problem is. Maybe? I say that cause these can kick your ass!
You need to change the connector at throttle body at this point. Here is a link to the TSB but your car is not listed in TSB.
But the connector is the same so all parts in TSB are what you need. The wires are costly gold tipped connector pins is the reason I assume.
I do not suggest you try used or some other type pins spend the Money and do it right.


Good Luck
 
   #16  

Crasher

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You can buy the gold plated terminals from Wurth and other sources, not sure about in the US though but you need the extractor tools and a set of very good uninsulated terminal crimps.
 
   #17  

Jef

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As I recall, the reason for that TSB was due to the listed vehicles having a manufacturing issue. VDO was to use [YXZ] connector type from Tyco, but due to a mixup, they used Tyco's [ABC] connector on the throttle body. Now the thing is, [XYZ] and [ABC] connectors are similar, you can get them to fit, but they are not making a good electrical/mechanical contact. So the fix was to cut off the [YXZ] connector of the wiring harness and fit it with the [ABC] connector to match the [ABC] connector on the throttle body.

Now on older cars like yours, a fun party trick was the O2 sensors getting messed up and screwing with the values of the throttle body and accelerator pedal. This was more common on the 1.8T engine. But the fun part is, you may NEVER get an O2 sensor fault code. And the issue an be super random... 5 feet or 5000 miles before it happens again so it can be difficult to verify repair work fixed the issue. :banghead:
 
   #18  

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so it can be difficult to verify repair work fixed the issue. :banghead:
Life in the connection lane... can't tell you how many machines I worked on over my career that failed due to connection failures.. I learned early to eliminate connections unless they were absolutely required by assembly or service need. When I worked at Avery, we re-designed a machine to eliminate connections - from 50+ connectors (all multi-wire), we got it down to less than 10 - I think it was 7... Goal met.. the redesigned machine was far more reliable.
 
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