2010 Golf Plus 1.6 TDI Cold Starting Problems

Adrian59

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I have had a cold-starting problem with my 2010 Golf Plus 1.6TDI (105PS CAYC engine) for about 4 years. The problem only occurs in the winter months so I believe it is related to the ambient air temperature (or humidity). Usually I only get the problem on the first start of the day after the car is sitting outside overnight. It happens between about October and April/May. During the summer there is no problem.

When I try to start the car it initially fires up OK, but then over the next 5 - 10 seconds the idle becomes unstable and then the engine stops. It does not respond to the throttle during this period. I then have to repeat this usually 3 or 4 times, but up to 10!, before the idle remains stable and the car is driveable. Subsequent hot or cold starts are then OK until the next morning, and the car drives fine, although sometimes slightly hesitant in the first couple of miles.

I have had the car checked a few times by the local main dealer and a couple of independent VW specialists. The following have been checked and eliminated:

- Main dealer said cold starting problem was not caused by EA189 update (2 years after update)
- Fuel delivery system and fuel pressures checked by main dealer (all OK), fuel filter changed as it was "dirty" (no improvement)
- It was suggested that the cranking battery voltage was low. I changed the battery - No improvement
- Scans on VCDS show no faults, the engine temperaure (coolant) reading was correct for cold start
- Glow plugs have been changed - No improvement

Current mileage is 113,000. The problem started at about 75,000 miles/2017 and is getting slowly worse. EA189 emissions software update was applied by VW in 2017.

This issue is driving me (& my wife) mad! I am not sure what to try next. A couple of ideas I had were changing the engine air intake sensor, or maybe the immobiliser is playing up when cold??

Any suggestions would be gratefully received!
 

Keithuk

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EA189 emissions software update was applied by VW in 2017

That was the worst thing you could have done as its not a legal requirement in the UK. There is a thread about this if you want to read it?

This isn't an easy question to answer on a forum.

Scans on VCDS show no faults.

Is that a genuine VCDS cable?

Even if there are no error codes.

You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

Post the VCDS log file it must be in CODE tags so we can see what it shows?

We have had members just post the top part of the VCDS log file which shows no malfunction in any section.

Maybe Crasher can think of something it could be as he is the expert in all VAG vehicle problem.
 

Adrian59

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Hi Keith

It was scanned by the main dealer and by the two independents. I have a print-out from the last one done in March which showed no issues. It was carried out with VCDS Release 19.6.2 (x64) data version 20200210 DS308.0 www. Ross-Tech.com. The last scan did give a Mass Air Flow Sensor stored intermittent fault P0101 00 [096], with a fault frequency of 1, about a week prior to the scan when the vehicle was travelling at 64km/h with a coolant temperature of 82 degC - so not thought to be relevant.

I can scan and upload the log report, but it has my name and car reg no. which I will need to obscure, unless i can PM it?
 

Keithuk

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If it was scanned by a dealer it won't be a free scan so they must have given a printout of the scan.

Unless you want to scan that printout we don't know all the details.

VAG Error Code: 16485/4794/7330/5667/4795/000257
EOBD II Error Code: P0101

Fault Location:
Mass Air Flow (MAF) Sensor (G70) - Circuit Range/Performance Problem/Implausible Signal

Possible Cause:
Malfunction Indicator Lamp (MIL)(K83) active.
Loss of Power.
Erratic Idle.

Wiring/Connector(s).
Air Leak(s) after Mass Air Flow (MAF) Sensor (G70).
Excessive restrictions in the Intake/Exhaust System.
Dirty air filter, clogged snow screen, clogged CAT.
Mass Air Flow (MAF) Sensor (G70) faulty,
Ground Spots corroded or Paint Residue.

Possible Solutions:
Check/Replace all faulty Wiring/Connector(s).
Check Intake Air Filter.
Check Mass Air Flow (MAF) Sensor (G70).
Check Earth Points.
Read Measuring Value Blocks (MVB).
Mass air flow vs upper threshold model < 60 - 800 kg/h.
Lower threshold model < 0 - 400 kg/h.
Load calculation > 18%.
Fuel system < -17%.

Special Notes:
In MY 1995-2002 (?) in Europe at VW diesel cars Mass Air Flow (MAF) Sensor (G70) had the bad reputation of slowly losing his performance, causing loss of power. It's not a matter of defective or breaking down, but it is filthy / dirty (not easy to clean). You can check functionality by making a log in [01-engine], [Measuring Value Blocks (MVB) - 08], group 003 (3rd gear, full throttle, from 1700-4000rpm).
It is not uncommon for a TDI to set Implausible Signal Mass Air Flow Sensor (G70) faults when the engine performance is reduced due to a mechanical problem. These mechanical problems may include, but are not limited to:
Faulty electric fuel pump or Restricted fuel filter. See the Fuel Pump Basic Settings for PD, PPD, and CR TDI Engines page for Basic Settings tips after replacement.
Excessive restrictions in the intake/exhaust system.
Internal camshaft/valve/lifter problems.

Tech Notes:
Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner. Reset code and drive vehicle. If the code comes back, it may be necessary to replaced the mass air flow sensor.

When is the code detected?:
A high voltage from the sensor is sent to Engine Control Module (ECM) under light load driving condition.
A low voltage from the sensor is sent to Engine Control Module (ECM).

Description:
The Mass Air Flow (MAF) Sensor (G70) is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a hot film that is supplied with electric current from the Engine Control Module (ECM).

The temperature of the hot film is controlled by the Engine Control Module (ECM) a certain amount. The heat generated by the hot film is reduced as the intake air flows around it. The more air, the greater the heat loss. Therefore, the Engine Control Module (ECM) must supply more electric current to maintain the temperature of the hot film as air flow increases. The Engine Control Module (ECM) detects the air flow by means of this current change.

As taken from my new EOBD II Fault Codes Software
 

Adrian59

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The VCDS log is now attached. I had to split it into 3 pdf files
 

Attachments

  • VCDS log p1-3.pdf
    1.1 MB · Views: 9
  • VCDS log p7.pdf
    516.5 KB · Views: 10
  • VCDS log p4-6.pdf
    1.3 MB · Views: 9

Keithuk

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As I've said: Post the VCDS log file it must be in CODE tags so we can see what it shows?

If you have posted 3 PDF files of the VCDS log file why couldn't you have posted the log file in CODE tags its easier to read rather than opening 3 PDF files?
 

Keithuk

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I don't know what CODE tags means?

CODE tags are like any other BR codes on the forum.

e.g.

Bold is Bold you put Bold[/b I've left of the last ] so you can see what I mean.

CODE tags are the same e.g.

Code:
I don't know what CODE tags means?

Any text inside
Code:
 tags
 

Adrian59

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OK, Here is the VCDS Report (it has been OCR'd so there may be the odd typo that I didn't find):

Code:
VCDSWindows Based VAG/VAS Emulator Running on Windows 1 x64
VCDS Version: Release 19 .6.2 (x64 ) Data version: 20200210 DS308 . 0


Dealer/Shop Name:
Workshop Code: 000 00000 000000


Self-Diagnosis Log
Monday, 02, March, 2420, 16 : 38 : 13 : 21895


VIN: WVWZZZ1KZAW588314 License PIaTe: DU1O
Mileage: 175330km-108945mi Repair Order:


Chassis Type: 1K-VW36 ( 1K0 )
Scan: 01 03 08 09 10 15 16 17 19 25 42 44 46 52 56 62 72


VIN: WVWZZZ1KZAW588314 Mileage: 175330km-108945miles


01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-lmmobilizer -- Status: OK 0000
42-Door Elect, Driver Status: OK 0000
44-Steering Assist Status: OK 0000
45-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
56-Radio Status: OK 0000
62-Dcor, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status : OK0000

Address 01: Engine (J623-CAYC) Label s: . 03L-906-023-CAY. clb
Part No SW: 03L 997 557 L     HW: 03L 906 023 A
Component: R4 1.61 TDI    H23 9982
Revision: --H23--    Serial nurnber: 00000000000000
Coding : 00114014032500080000
Shop #: WSC 01357 011 00200
ASAM Dataset: EV ECM16TDI02103L997557L 003003
ROD: EV_ECM16TDI02103L997557M.rod
VCID : 458AD38EC4F46167D6-8010


1 Fault Found:
7329 - Mass Air Flow Sensor (G70)
P0101 00 (096) - Implausible Signal
Intermittent * Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault StaLus: 00000001
Fault- Priority: 2
Fault Frequency: 1 
Mileage: 175058 km
Date: 2020 -02.26
Time: 09:39:33


Engine speed. 1613.00 /min
Normed load value: 0-0 %
Vehicle speed: 64 km/h
Coolant temperature: 82 oC
Intake air temperature: 11 oC
Ambient air pressure: 990 mbar
Voltage Terminal 30: 14.456 V
Unlearning counter according OBD: 28
Air mass: actual value (mglstroke)-MAF_MES: 237.975 mg/stroke
Air mass proportion filtered-FAC_MAF_CYL_KGH_RATIO_FIL: 1.88721
EGR Solen.val.: actual value-ANG_EGRV(O): O.OOO % 
Throttle valve adapter: actual value-ANG_THR[0]: 95.868 %
Charge air pressure specified value-MAP_SP_MMV: 1036.88 hPa
Charge air pressure: actual value-MAP_MMV: 1036.88 hPa
Engine torque-TQI SP: 0.00 Nm


Readiness: 0 0 0 0 0


Address 03: ABS Brakes (J104)           Labels:. 1K0-907-379-60EC1F.clb
Part No SW: 1K0 907 379 AJ               HW: 1K0 907 379 AJ
Component: ESP MK60EC1     H30 0107
Revision: 00H30001
Coding : 263B400D092A0002640E02E5901D0081300000
Shop #: WSC 01357 011 00200
VCID : 7AFO7072F58ADE9FEB-802E
No fault code found.


Address 08: Auto HVAC (J301)                  Labels:  3CB-907-336.clb
Part No SW: 3CB 907 336 AB                    HW: 3C8 901 335 AB
Component: Climatic        H14 0305
Revision: 00009001
Coding: 0000000002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV Climatic A01005
ROD: EV_ClimaBasis VW36.rod
VCID : 6DDA4B2EBCC479277E-8O38
No fault code found.



Address 09: Cent. Elect . (J519)            Labels: . 1K0-937-08x-09.clb
Part No SW: 1K0 937 084 B                  HW: 1K0 937 084 B
Component: BCM PQ35 B 103 0575
Revision: 00103 AG
Codins : 48180A3A9825F1E044080080340000E443510E88536D8960648000000000
Shop #: WSC 01357 011 00200
VCID: 2D5A8B2E7444B9273E-8078

Subsystem 1 - Part No: 5M0 955 119 C Labels: 1KX-955-119.CLB
Component: Wischer 20011 2L 0513
Coding: 009795

Subsystem 2 - Part No: 1K0 955 559 AG     Labels: 1K0-955-559-AG.CLB
Component: RLS 010210 05 55 0403
Cocling: 4330BB

Subsystem 3 - Part No: 1K8 951 171
Component: DWA-Sensor 00 001 0104

Subsystem 4 - Part No: 1K8 951 605
Component: LIN BACKUP HO H09 900
2
1 Fault Found:
01134 - Alarm Horn (H72)
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 4
Fault Frequency: 10
Reset counter: 172
Mileage: 173865 km
Time InCication: 0


Freeze Frame:
Term 15 Off
Voltage:. 12.90 V
OFF
OFF
Term 50 off
OFF
OFF

Address 10: Park/Steer Assist (J791)             Labels: . 1T0-919-475. clb
Part No SW: 1T0 919 475 G                      HW: 1T0 919 475
Component: PARKHILFE PLA H07 0102
Revision: ----------
Serial number: 05531001801063
Coding: 10100B
Shop #: WSC 01357 011 00200
VCI D : 3F86C166AE283BB79C-806A

No fault code found.


Address 15: Airbags (J234 )              Labels: l 5K0-959-655.clb
Parl- No SW: 5K0 959 655 F               HW: 5K0 959 655 F
Component: Airbagivw10              037 0606
Serial number: 003FMRA0ACGT
Coding:00003236
Shop #: WSC 01357 011 00200
ASAM Dataset: EV AirbaVW10SMEVW360 A01011
ROD: EV AirbaVW10SMEVW360.rod
VCID : 3D7ABB6EAC2429A78E-806B


Crash sensor for side airbag: driver side:
Subsystem 1 - Part No SW: 5M0 955 557       HW: 5M0 955 557
Component: S.Sens.Fahr.V H01 ----
Serral number: 3572MSME572F164DZZZ3


Crash sensor for siCe airbag: front passenger side:
Subsystem 2 - Part No SW: 5M0 955 557       HW: 5M0 955 557
Component-: -S.Sens.Beif.V H01 ----
Serial number: 3582MSME6056714EZZZ.


Crash sensor fcr side airbag: rear: driver side:

Component: S. Sens .Fahr. H
Serial number: 3511HSME2C61731FZZZS


Crash sensor for: side airbag: rear: passenger side:
Component: S.Sens.Beif.H
Serial number : 3521HSME1653731FZZZN


No fault code found.



Address 16: Steering wheel                 Labels: 1K0-953-549-MY9.lbl
Part No SW: 1K0 953 549 CQ            HW: 1K0 953 549 CQ
Component: J0527                         053 0111
Coding: 0000034
Shop #: WSC 01357 011 00200
VCID : 030E0D9642409F57B8-8056


No fault code found.


Address 17:                   Instruments (J285) Labels: | 5K0-920-xxx-17.cib-SRI1
Part- No SW: 5M0 920 970 J                     HW: 5M0 920 970 J
Component: KOMBI             H05 0305
Serial number: 00000000000000
Coding: 470B00
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_Kombi_UDS_VDD_RMO9  AO4O52
ROD: EV_Kombi_UDS_VDD_RMO9_004_VW32.rod
VCID : 3776A9468E1803F754-8062


No fault code found.



Address 19: CAN Gateway                   Labels:. 1KO-907-530-V4.clb
Part No SW: 1K0 907 530 AD               HW: 1K0 907 951
Cornponent: J533 Gateway                H07 0112
Revision: H07 01                    Serial nunrber: 010210F1001273
Coding : E9A07F06000202009003
Shop #: WSC 01357 011 00200
VCID : 69D23F3E402C650712-803C


No fault code found.



Address 25: Immobilizer (J334)                Labels: | 5K0-920-xxx-25-clb
Part No SW: 5K0 953 234                   HW: 5K0 953 234
Component: IMMO                  H05 0305
Serial number: 00000000000000
Coding:000000
Shop #: WSC 00000 000 00000
ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03005
ROD: EV_Immo_UDS_VDD_RM09.rod
vcrD : 6AD040328D2A6E1B-803E


No fault code found.



Address 42: Door Elect, Driver                  Label-s:. 1K0-959-701-MAX3.clb
Part No SW: 5K0 959 701 E                      HW: 5K0 959 701 E
Component: Tuer-SG                       009 2120
Coding: 0000692
Shop #: WSC 01357 011 00200
VCID: 346C9E4A576EE8EF71-8060


No fault code found.


Address 44: Steering Assist                Labels: 1K0-909-14x-GEN3.clb
Part No: 1K0 909 744 J
Component: EPS_ZFLS K1. 70 3001
Revision: 00H17000
Shop #: WSC 01357 011 00200
VCID : 3162975EA87CDDC71A-8064


No fault code found.



Address 52: Door Elect, Pass.            Labels: . 1K0-959-702-MAX3. clb
Part No SW: 5K0 959 702 E                 HW: 5K0 959 702 E
Com.ponent: Tuer:-SG            009 2120
Coding: 0000948
Shop #: WSC 01357 011 00200
VCID: 356AA34E5C14F1E746-8060


No fault code found.



Address 55: Radio (J503 )             Labels: . 5M0-035-1xx-56. clb
Part No SW: 5M0 035 186 AA                HW: 5M0 035 186 AA
Component: Radio RCD310   016 0049
Revision: 01000000             Serial number: VWZ1Z2K7016101
Coding: 0500040004
Shop #: WSC 01357 011 00200
VCID : 6BDE45368AD0771760-803E


No fault code found.



Address 62: Door, Rear Left                 Labels:. 1K0-959-703-GEN3.clb
Part No SW: 5K0 959 703                HW: 5K0 959 703
Component: Tuer-SG     007 2105
Coding:0000144
Shop #: WSC 01357 011 1012552
VCID : 71E2575E68FC9DC75A-8024


No fault code found.



Address 72: Door, Rear Right                Labels:. 1K0-959-704-GEN3.clb
Part No SW: 5K0 959 704                 HW: 5K0 959 704
Component: Tuer-SG                    007 2105
Coding: 0000144
Shop #: WSC 01357 011 1012552
VCID: 72E058526DFAA6DFA3-8026


No fault code found.



End----- ---- (Elapsed Time: A2:2?") -------
 

Keithuk

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VW Emissions Cheating Scandal - "diesel dupe"

I can't remember when or which thread I posted this VW Emissions problem, there are loads of threads I posted this in.

The basics are I've had 4 letters from VW about this, which all say its being looked into. The last 2 said take your car into a VW dealer to have the software updated.

You can read many reports of people taking there vehicle in and after they suffer from poor performance and loss of economy.

I called in my dealer to get a part I asked them in the office about this VW Emissions update.

They said its not compulsory to have it done its only a recommendation. Its only compulsory in USA where they have higher emissions standards.

I said if I have the problems reported online can I have the original software put back in they said NO.

To me any software update if it doesn't work you put back the original software it only computer controlled.

So stuff it.
 

Adrian59

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Oct 13, 2020
Messages
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Location
Kidderminster
Well I swapped the MAP/Air Intake Sensor at the weekend. No change.

I'm beginning to wonder if the ECU has an intermittent fault. I might try warming it up before I try a cold start.
 

Crasher

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Blame the ECU, the response of the last resort. ECU failure is extremely rare, I have seen genuine cases of this I think three times in the 30 years I have been dealing with them and forget any sort of ECU testing and repair, it is total crap. The most likely source of your starting problem is the injectors as on the CAYC they are extremely unreliable but changing them to see if it helps would cost more than the car is worth.
 

Adrian59

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Oct 13, 2020
Messages
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Location
Kidderminster
Well I am pretty much getting to my wits end on this! But your suggestion of the injectors is interesting. I did consider these a while ago, but it's quite a big step to change them out on the off chance! (I would change them if I could be sure it would fix the problem, as the car is worth more to us than its rapidly diminishing market value!)

One thing I wasn't sure about is whether the injectors would only affect cold starting during the winter, and not the summer months? I guess the diesel viscosity could have something to do with it.

I am assuming that changing the injectors is not going to be a DIY job? Not sure if I could get them out without a slide hammer, and the Haynes manual mentions calibration of the new injectors which presumably a VCDS function.
 

Crasher

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They are not too bad to do but often you do need the slide hammer and top attachment. We only fit genuine exchange units at the moment as the Siemens VDO units are currently unavailable, VAG part number 03L 130 277 SX and £1875.36 including VAT retail from VW dealers for a set of four.
 

Adrian59

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Kidderminster
Thanks, I'll bear it in mind. I knew they were expensive, but that number certainly concentrates the mind!

I had an Engine Fault warning when I cold started yesterday, so I'll have to get the codes read. It didn't recur and cleared after a few starts.
 

Adrian59

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So the flashing glow plug light returned on Monday along with the amber engine symbol - and they now seem to be permanent features!

I bought a scan tool (Autophix) and read the code today which is P242A00 which comes back as an exhaust temperature sensor, bank 1, sensor 3. I was unable to clear the fault lights with my scan tool, as I think the fault was immediately returning, which is presumably because the sensor is giving an improbable value.

A quick bit of googling says it is the Pre-DPF sensor with the brown plug, part number 03L906088AJ.

Is there anything I should know about changing the sensor. It looks fairly straightforward?
 
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