New to me, no power

[jaysen71581]

Good evening everyone, I recently acquired an ‘04 Passat wagon tdi. I bought the car knowing it had no power, it has had the timing belt and balance shaft delete recently done but I guess when he out the car back together he missed something, so far I have pulled the Intercooler hoses off and checked them, checked the vacuum lines and they are all new, tandum pump is new, I’m only questioning the n75 valve. The pic is of me trying move the car and it’s extremely lethargic. Does that look right?

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[Mozambiquer]

Good evening everyone, I recently acquired an ‘04 Passat wagon tdi. I bought the car knowing it had no power, it has had the timing belt and balance shaft delete recently done but I guess when he out the car back together he missed something, so far I have pulled the Intercooler hoses off and checked them, checked the vacuum lines and they are all new, tandum pump is new, I’m only questioning the n75 valve. The pic is of me trying move the car and it’s extremely lethargic. Does that look right?

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Make sure you have enough vacuum and that the vacuum lines are connected correctly

 

[MEgearhead]

We're going to need a bit more to go on. All I see in the screen shot is an acceleration from around 900 rpm to 1800 rpm, with the N75 decreasing from 80% to around 40% as the MAP climbs from around atmospheric pressure to around 1600 mbar. Nothing real earth shattering to me. The turbo is not fully spooled at that point, but it should be starting to put out some torque.

Can you describe "no power" a little more?

Does it run smoothly or is it missing?

Does it smoke?

Any codes?

Does MAP actual track specified reasonably?

Have you checked the timing of the belt since it was recently replaced?

Have you checked the cam?

I would not jump directly to the N75 valve. You can check that by running the boost control sequence. You should see the actuator move as the N75 command varies from low to high.

 

[jaysen71581]

We're going to need a bit more to go on. All I see in the screen shot is an acceleration from around 900 rpm to 1800 rpm, with the N75 decreasing from 80% to around 40% as the MAP climbs from around atmospheric pressure to around 1600 mbar. Nothing real earth shattering to me. The turbo is not fully spooled at that point, but it should be starting to put out some torque.

Can you describe "no power" a little more?

Does it run smoothly or is it missing?

Does it smoke?

Any codes?

Does MAP actual track specified reasonably?

Have you checked the timing of the belt since it was recently replaced?

Have you checked the cam?

I would not jump directly to the N75 valve. You can check that by running the boost control sequence. You should see the actuator move as the N75 command varies from low to high.

the car runs and idles perfectly, eas to start, cam looked good and timing is good. The only code it has is a TCM communication error. It doesn’t smoke , I put my vacuum pump on the turbo and the arm moves smooth and holds at 25 inches of mercury. The car just barley wants to move when I depress the accelerator, it will gradually get up to speed.

 

[jaysen71581]

Make sure you have enough vacuum and that the vacuum lines are connected correctly

I spent last night sorting out that mess, the lines are correctly routed, how would I check the tandum pump?

 

[Mozambiquer]

the car runs and idles perfectly, eas to start, cam looked good and timing is good. The only code it has is a TCM communication error. It doesn’t smoke , I put my vacuum pump on the turbo and the arm moves smooth and holds at 25 inches of mercury. The car just barley wants to move when I depress the accelerator, it will gradually get up to speed.

The tcm communication code is likely your problem. If the transmission is in limp mode it defaults to third gear and is gutless off the line. Try to communicate with the tcm with your scan tool.
I had that happen on mine, the tcm was shorted internally to the can line on mine. But it can also be power or ground to the tcm, as well as water in it. Its located under the passenger side footwell and if the sunroof or battery tray leak, it often gets into the tcm and causes problems.

 

[MEgearhead]

Try to communicate with the tcm with your scan tool.

+1

If the TCM is in limp mode, all the gears should be highlighted on the dash, but using VCDS to open the TCM is best.

As Mozambiquer said, it's likely water. If you can't communicate with the TCM and don't find evidence of water check the CAN wires.

I have a working TCM you can try from when I swapped mine. PM me if interested.

 

[jaysen71581]

I actually know that there are a few places in the passenger side footwell where there are wires factory spliced and they corrode, I had to splice new wires and cut out the corroded wire and that fixed his B5. I’m actually tackling that now because I figured I could fix that code lol

 

[jaysen71581]

Well the reworking worked, no transmission communication codes however no luck, the car is still being a dick. I’m going to try a new MAP Monday when I get off work.

 

[MEgearhead]

Can you communicate with the TCU using VCDS? Go to the TCU then select advanced measuring values and select a few.

Is the transmission starting in 1st now?

Does the dash still have all the gears highlighted?

Not trying to be argumentative but why do you think the MAP needs to be replaced? I would not suspect it based on the image in your first post.

Throwing parts at these gets expensive quick and will only make you hate them for no reason. What you need now is logical sequential troubleshooting.

 

[Mozambiquer]

Well the reworking worked, no transmission communication codes however no luck, the car is still being a dick. I’m going to try a new MAP Monday when I get off work.

Were you able to connect to the transmission with vcds?

 

[jaysen71581]

Were you able to connect to the transmission with vcds?

Yes I connected to it with no issues.

 

[Mozambiquer]

Yes I connected to it with no issues.

Are there any codes in the tcm?

 

[jaysen71581]

Are there any codes in the tcm?

No codes, the only thing Vag is saying now is emissions related faults however it doesn’t list them.

 

[MEgearhead]

No codes, the only thing Vag is saying now is emissions related faults however it doesn’t list them.

I'm confused. Can you clarify this? Where are you looking?

How about an autoscan?

 

[jaysen71581]

I'm confused. Can you clarify this? Where are you looking?

How about an autoscan?

When I get home I’ll take a pic and show you.

 

[jaysen71581]

I'm confused. Can you clarify this? Where are you looking?

How about an autoscan?

here is the one I was talking about:

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[jaysen71581]

Here is my autoscan from just moments ago:

Monday,15,August,2022,09:12:03:34089
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 22.3.1.4 (x64)
Data version: 20220407 DS337.0
www.Ross-Tech.com


VIN: WVWCE63B65E038471 License Plate:


Chassis Type: 3B (3B - VW Passat B5 (1997 > 2005))
Scan: 01 02 03 08 15 16 17 19 35 36 37 46 47 55 56 57 58 75 76 77


VIN: WVWCE63B65E038471 Mileage: 303470km-188567miles
-------------------------------------------------------------------------------
Address 01: Engine Labels: 038-906-016-BHW.lbl
Part No SW: 038 997 016 T HW: 028 101 198 2
Component: R4 2,0L EDC G000AG 0314
Revision: 12345678 Serial number: VWZ7Z0D0237939
Coding: 0150034
Shop #: WSC 09113 444 89107
VCID: 2F6D2411BD9865F766-515E
VINID: 9E69D35460D21855400C810704CB59F03D

No fault code found.
Readiness: 0 0 1 1 1

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 3B0 927 156 CF
Component: AG5 01V 2.0lPD USA 0404
Coding: 0001104
Shop #: WSC 05311 000 00000
VCID: 6CD7F31D4C0EDEEF03-515E

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8E0-614-111-ASR.lbl
Part No: 3B0 614 111
Component: ABS/ASR 5.3 FRONT D00
Coding: 00011
Shop #: WSC 05314
VCID: 53A548E1A170611722-5140

1 Fault Found:
18034 - Powertrain Data Bus
P1626 - 35-10 - Missing Message from TCU - Intermittent

-------------------------------------------------------------------------------
Address 15: Airbags Labels: 6Q0-909-605-VW5.lbl
Part No: 1C0 909 605 C
Component: 09 AIRBAG VW61 04 0003
Coding: 12345
Shop #: WSC 05311
VCID: 2447DB3DB45ED6AF8B-5124

1 Fault Found:
00532 - Supply Voltage B+
07-10 - Signal too Low - Intermittent

-------------------------------------------------------------------------------
Address 16: Steering wheel Labels: 1J0-907-487-A.lbl
Part No: 1J0 907 487 A
Component: Lenkradelektronik 0005
Coding: 00118
Shop #: WSC 05311
VCID: 2F6D2411ED9865F766-515E

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments Labels: 3B0-920-xx5-17.lbl
Part No: 3B0 920 929 C
Component: KOMBI+WEGFAHRSP VDO V04
Coding: 15235
Shop #: WSC 00000
VCID: 275DCC31C5683DB7AE-5124
WVWCE63B65E038471 VWZ7Z0D0237939

3 Faults Found:
01039 - Coolant Temperature Sensor (G2)
30-10 - Open or Short to Plus - Intermittent
00779 - Outside Air Temp Sensor (G17)
30-10 - Open or Short to Plus - Intermittent
01315 - Transmission Control Module
49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 19: CAN Gateway Labels: 6N0-909-901-19.clb
Part No: 6N0 909 901
Component: Gateway K<->CAN 0001
Coding: 00006
Shop #: WSC 05311
VCID: 70EFE76D30263A0F3F-5124

1 Fault Found:
01315 - Transmission Control Module
49-10 - No Communications - Intermittent

-------------------------------------------------------------------------------
Address 46: Central Conv. Labels: 1C0-959-799.lbl
Part No: 1C0 959 799 C
Component: 80 Komfortgerát HLO 0004
Coding: 00258
Shop #: WSC 05311
VCID: 377D1C7115C8AD373E-4B1C

Subsystem 1 - Part No: 1C1959801
Component: 80 Tõrsteuer.FS KLO 0202

Subsystem 2 - Part No: 1C1959802
Component: 80 Tõrsteuer.BF KLO 0202

Subsystem 3 - Part No: 1C0959811
Component: 80 Tõrsteuer.HL KLO 0202

Subsystem 4 - Part No: 1C0959812
Component: 80 Tõrsteuer.HR KLO 0202

3 Faults Found:
00928 - Locking Module for Central Locking; Front Driver Side (F220)
27-00 - Implausible Signal
00930 - Locking Module for Central Locking; Rear Left (F222)
27-10 - Implausible Signal - Intermittent
00931 - Locking Module for Central Locking; Rear Right (F223)
27-00 - Implausible Signal

-------------------------------------------------------------------------------
Address 56: Radio Labels: 3B7-035-1xx-56.lbl
Part No: 3B7 035 180 G
Component: Radio PM6 0016
Coding: 04031
Shop #: WSC 05311
VCID: 2447DB3DB45ED6AF8B-5140

No fault code found.

End-------------------------(Elapsed Time: 04:31)--------------------------

 

[MEgearhead]

Since you have VCDS and a VAG vehicle it is recommended to use autoscan or the actual modules instead of generic OBDII.

When you start VCDS choose control modules, then select 02 Transmission, and then Fault Codes. You will get better information that way.

Better yet, at the main menu select autoscan, then choose 3B-Passat (or something like that) in the drop-down menu on the left side. Copy and paste what comes up into a post and we can look at it. You can delete any identifying info like VIN etc. Actually for starters you can post only the engine, trans, and CAN gateway, as radio, central convenience, etc. is not that useful yet.

 

[MEgearhead]

Never mind my previous post. Overcome by your last post.

I'd save a copy of that autoscan then clear all the codes. It looks like the TCM communication issue has been resolved as it's showing up as intermittent in instruments and CAN gateway, but is gone from engine. However, it won't hurt to get that code out of the gateway and go from there.

 

[jaysen71581]

My question is why is this popping up in the ABS section if im not getting any errors in my Trans section?


Address 03: ABS Brakes Labels: 8E0-614-111-ASR.lbl
Part No: 3B0 614 111
Component: ABS/ASR 5.3 FRONT D00
Coding: 00011
Shop #: WSC 05314
VCID: 53A548E1A170611722-5140

1 Fault Found:
18034 - Powertrain Data Bus
P1626 - 35-10 - Missing Message from TCU - Intermittent

 

[jaysen71581]

So I went into every module and cleared all of them, I started the car and it runs/idles perfectly. Unfortunately it’s still powerless when I tested it. Thankfully tomorrow I’ll be able to pull all of the Intercooler hoses off my my sons b5 tdi and I’ll try that. That will eliminate faulty sensors and all that fun stuff. I’ll update tomorrow.

 

[MEgearhead]

My question is why is this popping up in the ABS section if im not getting any errors in my Trans section?

If that code was before you cleared it in the module it may have been a carryover from before. If the code is no longer active it will show as intermittent for a while (or sometimes a longer while approaching eternity), or until it's cleared.

 

[jaysen71581]

I just drove the car around and when I first start out it’s super slow like it has no power in 1st gear and then when it shifts to 2nd it seems fine, still like it’s missing some power but it gets up to speed, I noticed that the exhaust is disconnected under the car, does this car need any back pressure?

 

[jaysen71581]

I hooked up a boost gauge to see where I was at boost wise.

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[Mozambiquer]

Doesn't need back pressure.
Whats the torsion value at?
How much vacuum from the vacuum pump?

 

[jaysen71581]

Torsion value? Please elaborate, and how do I measure it at the vacuum pump?

 

[Mozambiquer]

Torsion value will be in group 4 iirc its the timing and too far negative will make it sluggish off the bat.also check group 13 at idle.
Vacuum you check with either a vacuum gauge or a mityvac works well too, check it at one of the vacuum lines coming from the pump to the vacuum reservoir or n75 valve it should be a minimum of 25in/hg vacuum there.

 

[jaysen71581]

Disregard I googled how to check it, I am at -1.0 kw for the torsion value.

 

[jaysen71581]

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