2000 VW Beetle electrical issue..

[leturrip]

Hello all, i am new to forum, 1st post here. tried to get any info on vwvortex but nothing.

just bought a 2000 vw beetle, 2.0L, auto tranny. last owners were feed up with trying to fix the issue.

car is in limp mode.

getting obd2 codes P1626 p0725 p1780 p1850 p1866

P0725 = Engine Speed Inp.Circ. Malfunction

P1626 = Data-Bus Powertrain Missing Message from Transm.Contr.

P1780 = Powertrain VW Specific Transmission Malfunction ??

P1850 = Data-Bus Powertrain Missing Message from Engine Contr.

P1866 =Data Bus Powertrain Missing messages​

previous owners had car at dealer, they scanned for codes. checked all module connections, did pin out check on TCM - ECM=all good

they tried replacing instrument cluster and recoding, same thing.

checked all grounds and connections, they couldn't get the codes to go away and car to exit limp mode.

this is a printout of errors from VW dealer

Have a DTC memory entries list fROM VW dealer

engine Control Module 1(engine electronics)(06a906018JQ --- 2.0LR4/2VMOTR AT V01
18044 35 P1636 databus drivetrain missing message from airbag control module (lost23 static)

Transmission Control Module(automatic transmission - 01m) (01m927733HM) ---AG4 GETREIBE 01M 4544
518 16 THROTTLE VALVE POTENTIOMETER (SIGNAL OUTSIDE TOLERANCE STATIC)
529 35 NO SPEED INFORMATION (LOST STATIC)
545 31 ENGINE/GEARBOX ELECTRICAL CONNECTION(OPEN CIRCUIT/SHORT CIRCUIT TO GROUND STATIC)
1314 49 ecm (no communication static)
1312 49 DRIVE TRAIN DATA BUS (NO COMMUNICATION STATIC)

BRAKES 1 (ABS ITT 20 IE) (IJ0907379 P ---ABS 20 EI CAN 0001
28535 right front ABS wheel speed senor (lost23 static)
1312 37 DRIVE TRAIN DATA BUS (FAULTY STATIC)
668 16 VECHICLE VOLTAGE TERMINAL 30 (SIGNAL OUTSIDE TOLERANCE)

DASHBOARD (17-INSTRUMENT CLUSTER / IMMOBILIZIER 2ND GENERATION)(1C0920801 --- KOMBI+WEGFAHRS. M73 VO2)
1314 49 ecm (no communication static)
1315 49 tcm (no communication static)
1316 49 bcm (no communication static)
1321 49 Airbag control module no communication static

GATEWAY (19 - DIAGNOSTIC INTERFACE FOR DATABUS) (6N0909901 --- GATEWAY K,<->CAN V022)
1314 49 ecm (no communication static)
1315 49 tcm (no communication static)
1316 49 bcm (no communication static)
1321 49 Airbag control module no communication static

also, on dash cluster the tach and gas gauge doesnt work, but the odo and speedo does. the car starts and runs good, the oid light flashes red after 5 seconds from start and the MIL light comes on after 10 seconds. the right rear signal light is missing. radio doesnt work.

any ideas?
thanks in advance for ur knowledge and time

 

[ifindoubtdont]

I had an almost identical problem on a Discovery 3. It turned out to be a chaffed wire to the front nearside wheel speed sensor. It caused a cascade effect and I got a list of faults as long as your arm. Landrover wanted nearly £2000 to put it right. £25 for the part and a few scuffed knuckles later it was fixed. Speed sensor/information has been mentioned in two different sections and is near the start of each list, I would check front drivers side speed sensor and wheel bearing for a start. Hope this helps.

 

[leturrip]

I had an almost identical problem on a Discovery 3. It turned out to be a chaffed wire to the front nearside wheel speed sensor. It caused a cascade effect and I got a list of faults as long as your arm. Landrover wanted nearly £2000 to put it right. £25 for the part and a few scuffed knuckles later it was fixed. Speed sensor/information has been mentioned in two different sections and is near the start of each list, I would check front drivers side speed sensor and wheel bearing for a start. Hope this helps.

thanks for response ifindoubtdont. i will start there. will keep posted as i go.

 

[PEG]

Hi dude,not familiar with that particular pairing,but do know the engine. Limp mode is usually,if no "ghost" errors,a result of missing information that is deemed important,or information which indicates a specific fault or missing info.

The errors in drivetrain info,may be one or several speed sensors,on the auto-box,or wheel sensors. The non-functioning tacho may or may not be an indication that the ECU is not seeing engine rpm either.

The problem with taking on a project of this nature,is not only knowing what is wrong,but finding out what everyone else has done,in an effort to rectify the issue.

I am familiar with code lists,and i would recommend ignoring the list you have,until you yourself, have cleared and obtained your own.

A cracking list of codes can be obtained from any cleared system,just by fiddling/disconnecting connections whilst running,and a couple of hillstarts and stalls:bigear:

Sometimes,a trawl through a model specific forum,can set you in the right direction...even if the advice is not to bother!

Good luck,and always remember,if one man made it,another can fix it :yes:

 

[ruston]

Hi dude,not familiar with that particular pairing,but do know the engine. Limp mode is usually,if no "ghost" errors,a result of missing information that is deemed important,or information which indicates a specific fault or missing info.

The errors in drivetrain info,may be one or several speed sensors,on the auto-box,or wheel sensors. The non-functioning tacho may or may not be an indication that the ECU is not seeing engine rpm either.

The problem with taking on a project of this nature,is not only knowing what is wrong,but finding out what everyone else has done,in an effort to rectify the issue.

I am familiar with code lists,and i would recommend ignoring the list you have,until you yourself, have cleared and obtained your own.

A cracking list of codes can be obtained from any cleared system,just by fiddling/disconnecting connections whilst running,and a couple of hillstarts and stalls:bigear:

Sometimes,a trawl through a model specific forum,can set you in the right direction...even if the advice is not to bother!

Good luck,and always remember,if one man made it,another can fix it :yes:

That is about the size of it, unless you have the expensive test equipment you are the mercy of the manufacturers deviations and particular gremlins.

Nearly all models of electronic wizard vehicles have their inbuilt peculiarities now and challenge even the most experienced and create a learning curve.

 

[leturrip]

how many grounds am i looking for to clean? and where about to look? will also look at abs connections and tcm connections. i also replaced a right front speed sensor that was faulty .*

or maybe it is something else i am missing? check fuse... could the fuse box be bad ?

tia for any help.


VCDS Version: Release 15.7.3 (x64) Running on Windows 10 x64
Data version: 20151216
Ross-Tech: Home

Friday,18,December,2015,17:06:36:49733

Chassis Type: 1C - VW New Beetle (1998 > 2010)
Scan: 01 02 03 08 15 17 19 22 25 26 29 35 37 39 46 54 56 65 75

Mileage: 174930km-108696miles
-------------------------------------------------------------------------------


Address 01: Engine Labels: 06A-906-018-AEG.lbl
Part No: 06A 906 018 JQ
Component: 2.0l R4/2V MOTR AT V01*
Coding: 00033
Shop #: WSC 91471*
VCID: 7AFBAFC2661D1CEE3F-4B00

3 Faults Found:
18044 - Powertrain Data Bus*
P1636 - 35-00 - Missing Message from Airbag Controller
18034 - Powertrain Data Bus*
P1626 - 35-00 - Missing Message from TCU
18057 - Powertrain Data Bus*
P1649 - 35-00 - Missing Message from ABS Controller
Readiness: 0110 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01M-927-733.lbl
Part No: 01M 927 733 HM
Component: AG4 Getriebe 01M 4544*
Coding: 00011
Shop #: WSC 00000*
VCID: 020BD7220ECD542E67-095E

5 Faults Found:
00518 - Throttle Position Sensor (G69)*
16-00 - Signal Outside Specifications
00529 - Engine Speed Signal Missing*
35-00 - -*
00545 - Engine-Transmission Electrical Connection*
31-00 - Open or Short to Ground
01314 - Engine Control Module*
49-00 - No Communications
01312 - Powertrain Data Bus*
49-00 - No Communications

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 1J0-907-37x-ABS.lbl
Part No: 1J0 907 379 P
Component: ABS 20 IE CAN 0001*
Coding: 03504
Shop #: WSC 00066*
VCID: 3E7363D23AB5F0CE43-4B00

1 Fault Found:
01312 - Powertrain Data Bus*
37-00 - Faulty

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 1C0-920-xx0.lbl
Part No: 1C0 920 801*
Component: KOMBI+WEGFAHRS. M73 V02*
Coding: 02312
Shop #: WSC 00000*
VCID: 58BFD54AB8D12EFE69-4AE8

Subsystem 1 - Part No: Ident
Component: Nr. Wegfahrs.:VWZ5Z0X5221496*
Ident.-Nr. Wegfahrs.:VWZ5Z0X5221496

4 Faults Found:
01314 - Engine Control Module*
49-00 - No Communications
01315 - Transmission Control Module*
49-00 - No Communications
01316 - ABS Control Module*
49-00 - No Communications
01321 - Control Module for Airbags (J234)*
49-00 - No Communications

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.lbl
Part No: 6N0 909 901*
Component: Gateway K<->CAN V022*
Coding: 00007
Shop #: WSC 91487*
VCID: 70EF8DEA306156BE81-4B00

4 Faults Found:
01314 - Engine Control Module*
49-00 - No Communications
01315 - Transmission Control Module*
49-00 - No Communications
01316 - ABS Control Module*
49-00 - No Communications
01321 - Control Module for Airbags (J234)*
49-00 - No Communications

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 1J0-959-799.lbl
Part No: 1J0 959 799 AJ
Component: 5X Zentral-SG Komf. 0001*
Coding: 00256
Shop #: WSC 00066*
VCID: 0603CB3222E5680E4B-4B1A

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

Subsystem 2 - Part No: 1J2959801D
Component: 5X Tõrsteuerger. BF0002B*

No fault code found.

End-------------------------(Elapsed Time: 04:18)--------------------------

 

[leturrip]

so i think it is a short or open circuit with in the drivetrain can bus wiring. any one know where i can find a wiring schematic for the control modules showing the can bus lines? tia

 

[ifindoubtdont]

This may be an odd question, but have you got cruise control fitted and operated from the steering wheel. If so consider the rotary coupler. Yet again had this with a Range Rover. And remember most faults cascade. Faults on Address 01 seem to fit.

 

[PEG]

I have had this on a Toyota,where it came very cheap,and with a catalogue of issues...

Code reading proved inconclusive,and CSI style investigation,found a steering rack had been fitted,by an outfit not familiar with a non-continuous rotary coupler,or "snail pack",which had failed on account of not being fitted at middle position.

This had flagged ABS fault codes,and a garage had attempted repairs based on fault codes gathered,which were not connected to the original fault.

These systems infuriate me. It was twenty years ago,i was questioning why an ECU on a base,runabout vehicle,would require information regarding "Wheel position" .....we knew it made no difference...together with the very limited access to "real-time" plug in vehicle diagnosis devices,compounded the quandary....

Who would have ever thought,it allowed ECU emission changes from stationary,to driving?.....yeah....no-one apart from all those seeing it :rofl:

I generally steer clear from small vehicle problems,no thanks,and no money...but got dragged in to a diagnosis job,on a Ford Kuga,today.

The 150 A alternator,had melted,and new one was functioning,but lad said was getting very hot,with no large current draw.

These creations,have a 800 watt electric supplementary cabin heater,plus the rest,which equates to a possible 300 amp requirement,prevented by ECU deduced load shedding...

Lad had DC amp clamp,on battery lead, in error...when placed on alternators own lead...130+ amps draw...all functioning...as designed...nice and ready to cook an egg or start a small fire (not uncommon on these)

The absolutely necessary nature of these unreliable controls,to prevent such disasters,does little to inspire confidence,and is the very reason i own an old Patrol,and would drive across the Gobi desert,this afternoon,in it.

Whereby, i could not be sure me pals £110,000 Rangerover,would make it to the chippy and back...:wink_smile: (despite three recalls)

 

[leturrip]

So I got rid of the speed sensor errors in the Trans mission. The wires and connectors had oil on them. Cleaned with electrical clean and used air compressor to dry the connectors after.*

Also factory radio had a blown fuse in behind the radio. Causing a safe mode.

Far as the no communication from all modules. I unplugged each module one at a time. Did scan. Here the Airbag module unplugged. ..all other modules can online. So ...that's where I am at ...tomorrow check the ground, then wires, also found out wire in seat belt can fail setting of Airbag light. But I think this maybe a faulty Airbag module.*
CHEERS.