Flashing Glow Plug

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Driving home from work got the flashing glow plug. Car immediately went to limp mode. Made it home (~ 4 mile drive) light stop & go traffic in sport mode.
Read the following engine related codes:

Address 01: Engine (CJA) Labels: 03L-906-022-CBE.clb
Part No SW: 03L 906 019 DB HW: 03L 906 019 DA
Component: R4 2,0L EDC G000AG 7970
Revision: 12H14--- Serial number:
Coding: 0050078
Shop #: WSC 01357 011 00200
VCID: 6EFD1A00798C243
2 Faults Found:

000665 - Boost Pressure Regulation
P0299 - 000 - Control Range Not Reached - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 2
Fault Frequency: 1
Mileage: 23243 km
Time Indication: 0
Date: 2012.14.28
Time: 17:52:29
Freeze Frame:
RPM: 2415 /min
Speed: 52.0 km/h
Load: 23.5 %
Absolute Pres.: 2131.8 mbar
Absolute Pres.: 1652.4 mbar
Lambda: 95.5 %
Lambda: 94.7 %

000665 - Boost Pressure Regulation
P0299 - 001 - Control Range Not Reached
Freeze Frame:
Fault Status: 01100001
Fault Priority: 2
Fault Frequency: 1
Mileage: 23243 km
Time Indication: 0
Date: 2012.14.28
Time: 17:52:29
Freeze Frame:
RPM: 2415 /min
Speed: 52.0 km/h
Load: 23.5 %
Absolute Pres.: 2131.8 mbar
Absolute Pres.: 1652.4 mbar
Lambda: 95.5 %
Lambda: 94.7 %
Readiness: 0 0 0 0 0

The engine was shaking a bit idling in the driveway while I did the scan. Didn't hear any other unusual noises (i.e. boost leak). I'm working 4 12's this week so I won't have a lot of time to address until Friday. For now I'm going to get it up on ramps. Pull the belly pan and give a good look over and under before thinking about getting this to the dealership. I'm also going to see if VCDS can tell me anything else that might be useful (i.e. info on regeneration).

I've got about 14.4k miles on the car. Just did a 300 mile RT on Sunday with no issues so wondering what's up. I'll keep posting observations here as well as a synopsis of my dealership transaction.

I also show some other codes that don't really make sense because I don't seem to be having issues with either the radio or AC that I can tell.

Address 56: Radio (J503) Labels: 5M0-035-1xx-56.clb
Part No SW: 1K0 035 180 AC HW: 1K0 035 180 AC
Component: Radio Prem-8 H15 0043
Revision: -----27S Serial number: VWZ4Z7L1102729
Coding: 0100040004
Shop #: WSC 01357 011 00200
VCID: 61E7713C78528BB
1 Fault Found:
02635 - Tuner Not Enabled/Activated
000 - -
Freeze Frame:
Fault Status: 01100000
Fault Priority: 7
Fault Frequency: 1
Reset counter: 245
Mileage: 19572 km
Time Indication: 0
Date: 2011.14.31
Time: 00:49:51

Address 08: Auto HVAC (J301) Labels: None
Part No SW: 7N0 907 426 AB HW: 7N0 907 426 AB
Component: AC Manuell H18 0303
Revision: 00013001
Coding: 0000001002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_ACManueBHBVW36X A01010
ROD: EV_ACManueBHBVW36X_VW36.rod
VCID: 74C90868DFA00E3
1 Fault Found:
9474577 - Motor for Recirculation Flap
B1092 11 [009] - Short to Ground
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 27
Mileage: 21134 km
Date: 2012.14.18
Time: 16:46:07

Any feedback here would be appreciated - Thanks
 
Last edited:

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Started the car up to wheel it in the garage. No glow plug light, but engine was still a bit rough (vibration). I'm sure the car is not doing a regen right now. Put is up on ramps to have a look under. Nothing seems out of place / loose that could be dumping boost. The car looks pretty squared away (first time underneath). I guess I'll have to invest in a book. Done for tonight. Will check intercooler hoses for slime accumulation tomorrow. This issue seems pointed toward the TC or it's controls. Perhaps VCDS will point more of a way with further study, tomorrow. Nothing suggests HPFP issues, but I'll probably pop the Fuel Control Valve for a look under before it goes to the shop if I don't find anything obviously out of place topside.
 

JSWTDI09

Top Post Dawg
Joined
Jan 31, 2009
Location
Las Vegas, Nevada
TDI
2009 JSW TDI (gone but not forgotten)
First, the engine codes, this might give you a place to start:

http://wiki.ross-tech.com/wiki/index.php/16683/P0299/000665

Check hoses, if you don't find anything, see your dealer for warranty repair.

Second, the radio code: This just means that you do not have a subscription with Sirius for your satellite radio (hence not activated). No worry (unless you do have a Sirius subscription)

Third, HVAC. Sounds pretty self explanatory. Recirculate flap motor has a problem, but this happened over 2k miles ago. Have you noticed any HVAC issues? You could clear it and see if it comes back.

Your car is a 2011 and it is still under warranty. I would let a VW dealer look at it.

Have Fun!

Don
 
Last edited:

Ol'Rattler

Top Post Dawg
Joined
Jul 3, 2007
Location
PNA
TDI
2006 BRM Jetta
Something on the A5's that would cause the flashing glow plug light was a bad brake light switch. Next time you get the flashing glow plug light, see if cruise engages and holds speed.

The brake light switch has two contacts in it. One contact is for the brake lights and the other contact tells the ECU when the brakes are applied.

If the ECU thinks the brakes are applied, it will:
  • Disengage the cruise, if it is applied.
  • Not allow the cruise to engage.
  • Limit RPM to something like 2500 RPM's (similar to "limp mode").
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Thanks Gents - I'll be reading up a bit at work today and studying things more tonight. In driving the car, I had just made a turn leaving work and was stepping on the accelerator. Suspect something may have just stuck. Of course I'll be letting VW handle this under warranty. I rarely bring any vehicle in to a dealer without having done some kind of diagnosis myself first. Keeps them honest.
 

740GLE

Top Post Dawg
Joined
Aug 19, 2009
Location
NH
TDI
2015 Passat SEL, 2017 Alltrack SE; BB 2010 Sedan Man; 2012 Passat,
i'll toss my vote in that you have an VNT actuator that's acting up, it might just be sticking a little bit but enough to store the codes. Plus explaining why you didn't see the GP light when pulling into the garage, you weren't requesting boost so until you do, the GP flash showing somethings messed up. I bet if you went for another drive it'll be in limp mode again soon as you try merging with traffic.

Those codes are all the dealer needs to replace whats needed.
 

ElectricMayhem

Veteran Member
Joined
Nov 20, 2008
Location
Ontario, Canada
TDI
None!
If you weren't in Florida I was going to say that the boost pressure regulation codes were what I got when they said I needed a new cold weather intercooler. I gather there were slugs of condensed water being sucked into the engine in my case.
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
i'll toss my vote in that you have an VNT actuator that's acting up, it might just be sticking a little bit but enough to store the codes. Plus explaining why you didn't see the GP light when pulling into the garage, you weren't requesting boost so until you do, the GP flash showing somethings messed up. I bet if you went for another drive it'll be in limp mode again soon as you try merging with traffic.

Those codes are all the dealer needs to replace whats needed.
Thanks 740GLE - Underboost makes me immediately suspect VTG issues.

I think based on where I was at engine load / rpm wise that I was probably in transition between HP & LP EGR modes. Still working to absorbe the narrative in detail. I'll probably put together a troubleshooting matrix and post it here when this evolution is over. What I don't have a feel for at this point is exactly which of the many possible component malfunctions trigger individual trouble codes.

LOL - I suppose eventually I'll read the entire Rosstech Wiki. If I really get up against it I'll buy a Bentley [manual]. For now, I view this situation as a learning exercise. Taking it to the dealer without doing a bit of legwork takes all the fun out of it.

Doing a read through on the exhaust treatment modes is kind of make my head spin. Makes me wonder how Bosch can figure all that yet still not have a bullet proof design for the HPFP.

If you weren't in Florida I was going to say that the boost pressure regulation codes were what I got when they said I needed a new cold weather intercooler. I gather there were slugs of condensed water being sucked into the engine in my case.
I was just reading through your thread and lightly skimming the scholarly work on the frozen intercooler issue posted by GraniteRooster and many others here. There was an immediate connection with the DTC. One of the things on my to do for tonight is to check the pipes for slime / fluid.

I have a nack for catching this car in the middle of regen. I'm going to see what I can learn about regen status with VCDS tonight as well. I work 12 hour shifts so I have to fit car stuff in along with everything else. My wife wants to bring the car in. She's a sharp cookie. But I'm not going to pass up this opportunity to QA my dealers service department.
 
Last edited:

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Last night I got an emergency call from work giving me a 15 hr workday. Tonight other commitments will likely keep me out of the garage as well. I will post what I learn here.
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Got some time in on the car and did the following:

1. Checked the passenger side intercooler hose. Found a bit of olive colored slime - wiped it out. Not much, but being under the car it was an easy check.

2. Checked all reachable connectors on the underside in way of the engine compartment - found nothing loose.

3. Carefully went over topside connectors. Did not find anything loose.

4. Went over the vacuum hose circuit attached to the turbo vacuum cell, vacuum controller, etc. No issues observed with any of the plumbing.

5. Buttoned it all back up. Took the car out for a test drive. At first it felt a little bit sluggish like it was a bit short on pep, but it seemed to improve in a short time. Drove the car around for close to 30 minutes under varying loads including some WOT. Some travel in town and some on the interstate up to ~ 85 mph. No adverse indications from any of the instrument lights (glow plug, check engine, etc).

6. Did some VCDS logging looking at specified v.s. actual boost. They seemed to track together fairly well with specified leading a bit during hard acceleration - makes sense

7. Did some VCDS logging looking for a spread between EGR specified v.s actual. These values seemed to track each other well.

8. Did some VCDS logging looking at CR pressures (specified vs actual) didn't see any significant offset as compared to earlier loggings.

My conclusion at this point is I had something stick last Monday that appears to have resolved. VCDS showed 3 regenerations in advanced measuring blocks. Not sure what that specifically refers to because with 14.4k miles the car has seen a lot more than 3. Have to research this a bit more (RTFM).

Plan is to get the car into the dealer tomorrow if possible (otherwise next week) for them to scan and road test. I have a ~ 240 mile road trip Easter Sunday. Unless the dealer says no, I plan to take the Golf.

I'll post a summary of my interaction with the dealer.
 

jeff.zienk

Member
Joined
Sep 6, 2011
Location
Romeo MI
TDI
2010 Jetta DSG White
i have the same thing going on but i think i have a worse case...
mine goes in the "limp mode" every half mile with the gp light flashing.
took it to a trusted tdi mechanic and he scanned it but we have none of the same codes going on

3 Faults Found:

001151 - Exhaust Pressure Control Valve
P047F - 000 - Stuck Open - MIL ON


001025 - EGR System
P0401 - 000 - Insufficient Flow - Intermittent


000175 - Actuator Module for Turbocharger 1
P00AF - 000 - Stuck - MIL ON

still waiting to hear more back from the guy but not planning on hearing any thing back till after easter
 

JSWTDI09

Top Post Dawg
Joined
Jan 31, 2009
Location
Las Vegas, Nevada
TDI
2009 JSW TDI (gone but not forgotten)
3 Faults Found:

001151 - Exhaust Pressure Control Valve
P047F - 000 - Stuck Open - MIL ON


001025 - EGR System
P0401 - 000 - Insufficient Flow - Intermittent


000175 - Actuator Module for Turbocharger 1
P00AF - 000 - Stuck - MIL ON
You are correct in that you have a different problem. Your exhaust flap (valve) is stuck. Here's some reading for you:

http://forums.tdiclub.com/showthread.php?t=275066
http://forums.tdiclub.com/showthread.php?t=302033
http://forums.tdiclub.com/showthread.php?t=316390

The turbo actuator may or may not be related to this issue. This exhaust flap is often repairable (second link above).

Here is some info about the turbo error: http://wiki.ross-tech.com/wiki/index.php/000175

Have Fun!

Don
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Being Good Friday the dealership is short staffed (kind of figured this but drove over anyway). I have an appointment Tuesday morning. Car ran fine today - no dash warnings - no limp operation. Wife drove it today and said it runs fine. Road tripping it to Tampa Easter Sunday. Happy Easter All!
 
Last edited:

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
i have the same thing going on but i think i have a worse case...
mine goes in the "limp mode" every half mile with the gp light flashing.
took it to a trusted tdi mechanic and he scanned it but we have none of the same codes going on
3 Faults Found:
001151 - Exhaust Pressure Control Valve
P047F - 000 - Stuck Open - MIL ON
001025 - EGR System
P0401 - 000 - Insufficient Flow - Intermittent
000175 - Actuator Module for Turbocharger 1
P00AF - 000 - Stuck - MIL ON
still waiting to hear more back from the guy but not planning on hearing any thing back till after easter
Don - You're great - Thanks for posting the links.

Jeff - I'm hoping you have an alternative vehicle until you can get your situation addressed. Sounds like your vehicle isn't doing low pressure EGR very well. Exhaust line valve adds back pressure to improve LP EGR flow. The exhaust treatment system (per narrative) has a number of different operating modes. It's pretty complex. Operating under these conditions is probably not a good thing.
 
Last edited:

AGOODHI

Veteran Member
Joined
Jul 30, 2011
Location
NorCal
TDI
MKVII GSW, MKVI Golf
Address 08: Auto HVAC (J301) Labels: None
Part No SW: 7N0 907 426 AB HW: 7N0 907 426 AB
Component: AC Manuell H18 0303
Revision: 00013001
Coding: 0000001002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_ACManueBHBVW36X A01010
ROD: EV_ACManueBHBVW36X_VW36.rod
VCID: 74C90868DFA00E3
1 Fault Found:
9474577 - Motor for Recirculation Flap
B1092 11 [009] - Short to Ground
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 27
Mileage: 21134 km
Date: 2012.14.18
Time: 16:46:07
I had this one before. Dealer swapped in new recirc. motor. I haven't scanned it since though.

--Ryan
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Thanks Ryan - I didn't have a long chat with service writer today but will take this up on Tuesday. I have another earlier scan that shows a reset counter of 87. So this motor has probably not worked well (or at all) for some time. Most of the time I don't run the HVAC in recirc mode. But it will be nice to have this corrected before the summer heat comes in earnest.

--Paul
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
The car's going to get a work out between now and Tuesday morning's appointment (estimated close to 600 miles). Per Don''s link to the Rosstech Wiki, the following issue is suggested:

When found in VW Golf/Jetta (1K): 2.0l CR-TDI (CBEA/CJAA):
Verify the mechanical part of the Exhaust Valve Control Module (J883) is not siezed or binding.


After some thought, it's hard to imagine that the VNT turbo element is acting up this early in the lifecycle of this engine / turbo. As noted earlier there are no observed hose issues. My conclusion is that the weak point (per above) is that the Exhaust Valve may have been sticking a bit. Prior to this malfunction, the car had been on a 300 mile RT. Was driven to work (~ 4 miles with 0 traffic issues - easy riding) and acted up the first time the engine was loaded. During a long run at highway speeds the engine likely settles into LP EGR which probably means the valve is running partially shut.

I've seen the recent thread on exhaust valve maintenance. Wondering if anyone notices a connection between exhaust valve issues after long road trips? If there is an issue with this valve sticking there's a good chance I'll see a repeat of this DTC. Any comments / thoughts?
 
Last edited:

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Did ~ 250 miles today - Issue did not re-appear. Car ran well delivering expected fuel economy. Looks like this issue is rapidly going to zero for now. I believe my exhaust valve may be getting sticky. At 14.7k miles this seems a bit premature for a FL car thats never been on salted roads or to the beach.
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Got the car into the shop this morning. Here is the summary of activity:



VCDS reported the following with respect to the flashing glow plug:

Address 01: Engine (CJA) Labels: 03L-906-022-CBE.clb
Part No SW: 03L 906 019 DB HW: 03L 906 019 DA
Component: R4 2,0L EDC G000AG 7970
Revision: 12H14--- Serial number:
Coding: 0050078
Shop #: WSC 01357 011 00200
VCID: 6EFD1A00798C243

2 Faults Found:

000665 - Boost Pressure Regulation
P0299 - 000 - Control Range Not Reached - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 2
Fault Frequency: 1
Mileage: 23243 km
Time Indication: 0
Date: 2012.14.28
Time: 17:52:29
Freeze Frame:
RPM: 2415 /min
Speed: 52.0 km/h
Load: 23.5 %
Absolute Pres.: 2131.8 mbar
Absolute Pres.: 1652.4 mbar
Lambda: 95.5 %
Lambda: 94.7 %

000665 - Boost Pressure Regulation
P0299 - 001 - Control Range Not Reached
Freeze Frame:
Fault Status: 01100001
Fault Priority: 2
Fault Frequency: 1
Mileage: 23243 km
Time Indication: 0
Date: 2012.14.28
Time: 17:52:29
Freeze Frame:
RPM: 2415 /min
Speed: 52.0 km/h
Load: 23.5 %
Absolute Pres.: 2131.8 mbar
Absolute Pres.: 1652.4 mbar
Lambda: 95.5 %
Lambda: 94.7 %
Readiness: 0 0 0 0 0


The service writer reviewed service notes and specifically confirmed that this was an over boost fault. The VCDS freeze frame data did not identify specified vs actual. I called RossTech and they could not shed any more light on which value was which in the freeze frame. They indicated that these pressure figures represented values reported directly from the engine controller.

I've put ~ 600 miles on the car since the original fault with no additional faults occurring. Trust me, I tried to duplicate this situation. So at this point I'm considering this matter closed. I've worked with machinery enough to know that it is typically not "self healing". So if there is an underlying issue behind this code, it will likely resurface down the road.

The other fault code on the HVAC system is a bit interesting. I scanned the car shortly after getting VCDS (20 August 2011). I really didn't look at the scan just saved it. It shows the following fault:

Address 08: Auto HVAC (J301) Labels: None
Part No SW: 7N0 907 426 AB HW: 7N0 907 426 AB
Component: AC Manuell H18 0303
Revision: 00013001
Coding: 0000001002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_ACManueBHBVW36X A01010
ROD: EV_ACManueBHBVW36X_VW36.rod
VCID: 74C908686E2B

1 Fault Found:

9474577 - Motor for Recirculation Flap
B1092 11 [009] - Short to Ground
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 84
Mileage: 3673 km
Date: 2005.14.24
Time: 18:07:45


A rescan of the system on 4-2-12 showed this entry:

Address 08: Auto HVAC (J301) Labels: None
Part No SW: 7N0 907 426 AB HW: 7N0 907 426 AB
Component: AC Manuell H18 0303
Revision: 00013001
Coding: 0000001002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_ACManueBHBVW36X A01010
ROD: EV_ACManueBHBVW36X_VW36.rod
VCID: 74C90868DFA00E3

1 Fault Found:

9474577 - Motor for Recirculation Flap
B1092 11 [009] - Short to Ground
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 27
Mileage: 21134 km
Date: 2012.14.18
Time: 16:46:07


The service writer at the dealership said that VW's tend to throw codes on systems in most cases because control instructions are not executed immediately by components. He said this happens a lot with HVAC systems and audio systems. For now I'm taking this explaination at face value. I know from my own experiences Bosch management systems are only so smart. It would make no real economic sense to build a system that could differentiate between stuck and sticky HVAC flappers.

According to the Ross-Tech Wiki, the decreasing reset counter implies that there have been a number of successful operations of this recirculation flapper. The fact that it's not to zero, implies it still malfunctions from time to time. For now I'm going to consider this closed as well. When I got home from the dealership today, I scanned the vehicle and found this HVAC code had been cleared along with the engine faults shown above.

Based on this experience, I'm going to adopt a practice of scanning my car routinely on a monthly basis. Of course I will be scanning anytime fault lights or limp mode occurs. I don't have much else to report. Not additional lessons learned except for my earlier comments. It does appear that this issue points toward stuck IGV's rather than a stuck exhaust valve. So I would have to agree with 740GLE's great instincts that this was a VNT issue. I always defer to the voices of experience but wonder how anyone could make this kind of call up front. Perhaps 740GLE knows more about Ross-Tech output then their own technical department does. On balance it is comforting to know that the engine does go into limp mode if over boost occurs.

Last time I washed the car I saw that a rock had damaged the lens on the driver side fog light. The dealership is ordering a replacement. To "wet their beak" I'm going to let them install it. Parts & labor will be ~$160 for the replacement. One more opportunity to QA the dealership. I got the car back washed and even vacuumed out. So the dealer seems to be in the game from a customer service perspective.

THANKS TO EVERYONE for your thoughts and comments on this issue. I'm still in learn mode on this vehicle and your help made a difference.
-Paul
 
Last edited:

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
I took my car back to the dealership this morning to have the drivers side fog replaced (rock probably cracked the lens). While waiting, I wondered out on the showroom floor. I quizzed a salesmen about MY2013 Golf's. Specifically about whether they would be getting "add blue". He said that things were still not completely nailed down for MY2013. He said that "add blue" was primarily fitted on vehicles to save weight.

When I was chatting with the service writer I asked him about MY2013 Golf's and "add blue". It was funny - He made the same comment that "add blue" was primarily a weight saving addition. He basically said that the Golf's don't really need to trim weight. He doubted that "add blue" would be fitted on MY2013 Golf's.
 

AGOODHI

Veteran Member
Joined
Jul 30, 2011
Location
NorCal
TDI
MKVII GSW, MKVI Golf
The other fault code on the HVAC system is a bit interesting. I scanned the car shortly after getting VCDS (20 August 2011). I really didn't look at the scan just saved it. It shows the following fault:

Address 08: Auto HVAC (J301) Labels: None
Part No SW: 7N0 907 426 AB HW: 7N0 907 426 AB
Component: AC Manuell H18 0303
Revision: 00013001
Coding: 0000001002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_ACManueBHBVW36X A01010
ROD: EV_ACManueBHBVW36X_VW36.rod
VCID: 74C908686E2B

1 Fault Found:

9474577 - Motor for Recirculation Flap
B1092 11 [009] - Short to Ground
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 84
Mileage: 3673 km
Date: 2005.14.24
Time: 18:07:45


A rescan of the system on 4-2-12 showed this entry:

Address 08: Auto HVAC (J301) Labels: None
Part No SW: 7N0 907 426 AB HW: 7N0 907 426 AB
Component: AC Manuell H18 0303
Revision: 00013001
Coding: 0000001002
Shop #: WSC 01357 011 00200
ASAM Dataset: EV_ACManueBHBVW36X A01010
ROD: EV_ACManueBHBVW36X_VW36.rod
VCID: 74C90868DFA00E3

1 Fault Found:

9474577 - Motor for Recirculation Flap
B1092 11 [009] - Short to Ground
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Reset counter: 27
Mileage: 21134 km
Date: 2012.14.18
Time: 16:46:07


The service writer at the dealership said that VW's tend to throw codes on systems in most cases because control instructions are not executed immediately by components. He said this happens a lot with HVAC systems and audio systems. For now I'm taking this explaination at face value. I know from my own experiences Bosch management systems are only so smart. It would make no real economic sense to build a system that could differentiate between stuck and sticky HVAC flappers.

According to the Ross-Tech Wiki, the decreasing reset counter implies that there have been a number of successful operations of this recirculation flapper. The fact that it's not to zero, implies it still malfunctions from time to time. For now I'm going to consider this closed as well. When I got home from the dealership today, I scanned the vehicle and found this HVAC code had been cleared along with the engine faults shown above.
I have not re-scanned mine since the dealer replaced the HVAC motor. I don't own a VCDS (I usually borrow one), so I can't scan it to check. I'm getting tired of borrowing it, so maybe some tax return money will go to Ross-Tech ;)

--Ryan
 

specsalot

Veteran Member
Joined
Jul 30, 2011
Location
Florida
TDI
Currently none
Choose your version carefully. Be aware (I wasn't) that the micro-CAN interface is somewhat slower than the HEX-USB+CAN. For DTC codes / diagnostics / VCDS tweaks it doesn't make any difference.

If you want to look at real time parameters the more expensive HEX-USB+CAN is slightly faster. If you look at pricing / upgrade costs it gets expensive to trade up after purchase.

Here's a graph from the companion display application for VCDS log files. It was a study in how stable CR pressure is under trailing throttle conditions. The red line shows engine RPM; Blue is % signal to the fuel pressure regulator; White is % signal to the Fuel Metering valve; Green is fuel delivery; Yellow is CR pressure; and light blue is vehicle speed. Based on a review of a number of these graphs, I've decided Sport mode needs to be used in stop and go driving.

This is an example of what can be done with the companion application. You can also use EXCEL on the CSV log file itself if you don't like the companion app. There isn't a lot of documentation with the companion app. You've got to figure it out as you go. Scaling can be a bit tricky. But it's a freebee so I'm not complaining.



These parameters were selected using "Advanced Measuring Block" features. You can basically select up to 12 points at a time to monitor. It's fair to remember that the CAN interface is what keeps the car running. I think there is a limit on how many points can be selected at one time because it probably adds to bus traffic. Bus congestion might impact operation, even though bus communication is based on ordered priorities. It's a great tool to understand basic relationships. There are a number of different "performance" templates I haven't tried as of yet. Worth the money if you want to know more about the workings of your vehicle.

If I had purchased the HEX-USB+CAN, I suspect the curves would have been a bit smoother with ~ 2 x as many data points.
 
Last edited:
Top