Error Loading Pressure Regulation, HELP

Hello,

I have an Amarok with a CDCA 2.0BITDI engine.
It throws the following error:

5294 - Turbocharger Boost Control
P154F00 (039) - Malfunction.

I have already tested the boost sensor and the LMM (Lambda Sensor), the values are ok.

In the default settings, I have checked the turbocharger and the Biturbocharger and the AGR (Exhaust Gas Recirculation), everything is fine.

However, when checking the turbocharger boost control, it throws the above mentioned error.

It does not generate any boost pressure; in fact, when accelerating from a standstill, the value of the boost sensor before the intake manifold even drops slightly below the ambient pressure.

I have checked the vacuum hoses and the shafts of both turbochargers, and there are no abnormalities.

The calculated amount of ash in the DPF is approximately 20 grams according to VCDS.

I hope you can help me, I'm not a fan of randomly replacing parts.

I can't find anything online about this error.

Automated scanning?

Is the loading distance printed?

Tuesday, January 31, 2023, 17:54:26:45078
VCDS -- Windows-based VAG/VAS emulator running on Windows 11 x64
VCDS Version: DRV 22.10.0.1
Data status: 20221111 DS344.0
shop.dieselschrauber.org

Vehicle Identification No.: WV1ZZZ2HZB8069570 Vehicle Registration:
Mileage: 176530km Repair order:

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

Vehicle type: 2H-VN81 (6N0)
Scan: 01 03 08 09 10 15 17 19 25 37 56 69

Vehicle Identification No.: WV1ZZZ2HZB8069570 Mileage: 176530km

01-Engine Electronics -- Status: Error 0010
03-Brake Electronics -- Status: OK 0000
04-Steering Angle Sensor -- Status: OK 0000
08-Climate/Heating System -- Status: OK 0000
09-Central Electronics -- Status: OK 0000
10-Parking Assist 2 -- Status: OK 0000
15-Airbag -- Status: OK 0000
17-Dashboard -- Status: OK 0000
19-Diagnostic Interface -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
37-Navigation -- Status: OK 0000
56-Radio -- Status: OK 0000
69-Trailer Hitch -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine Electronics (J623-CDCA) Label file: . DRV\03L-906-022-CAA.clb
Part Number SW: 03L 906 019 FC HW: 03L 907 309 K
Part: R4 2.0l BTD H40 9978
Revision: 26H40--- Serial Number: 00000000000000 CVN: 7FDAF74D
Encoding: 01194012232600080000
Operating Number: WSC 55851 001 1048576
ASAM Data Set: EV_ECM20BTD01103L906019FC 004006
ROD: EV_ECM20BTD01103L906019FC_004.rod
VCID: 71EE5301A0190C057D-8024
VINID: 9E606AAAA098A9220018914700C3FFF1AE

1 Fault Found:
5249 - Turbocharger Boost Control
P154F 00
[039]
- Malfunction
Unconfirmed - Checked since last deletion
Environmental conditions:
Error status: 00000001
Error priority: 2
Error frequency: 1
Mileage: 176536 km
Date: 2023.01.31
Time: 03:15:35

Engine speed: 2799.00 /min
Normalized load value: 26.3 %
Vehicle speed: 0 km/h
Coolant temperature: 85 °C
Intake air temperature: 33 °C
Ambient air pressure: 950 mbar
Voltage terminal 30: 14.040 V
OBD rele counter: 40
Boost pressure: Target value: 1348 hPa
Boost pressure: Actual value: 916.2 hPa
Air mass: Actual value (mg/stroke): 461.3 mg/stroke
Air filter dirtiness: 0.00 %
Throttle position actuator: Actual value: 99.96 %
Bypass valve for turbocharger high pressure turbine inlet: Actual value: 4.83 %
Average injection quantity: 6.38 mg/stroke

Readiness: 1010 0000

-------------------------------------------------------------------------------
Address 03: Brake electronics (-----) Label file: 2H0-907-37x-ESP.clb
Part number SW: 2H0 907 379 G HW: 2H0 907 379 D
Part: ESP MK25A XT H44 0106
Revision: 00H44001
Encoding: C07324B69A9A039E24A759AA6F5010
Operating number: WSC 07456 790 49164
VCID: 34609A15978B792D56-8060

No(s) error code(s) found.

-------------------------------------------------------------------------------
Address 08: Air conditioning/heating electronics (J255) Label file:| DRV\7E5-907-040.clb
Part number SW: 2H0 907 040 D HW: 2H0 907 040 D
Part: ClimatronicT5 H11 0304
Revision: 00002001
Encoding: 0000000002
Operating number: WSC 07456 790 50316
ASAM data set: EV_ClimatronicT5 A01003
ROD: EV_ClimaAutoT5Basis_VN81.rod
VCID: 224C6C4D357FE79DB4-8076

1 error found:
9478145 - Control of front fresh air fan
B10A0 01
[009]
- Electrical Fault
Confirmed - Checked since last deletion
Environmental Conditions:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Loss Counter: 149
Mileage: 176536 km
Date: 2023.01.31
Time: 03:17:19

-------------------------------------------------------------------------------
Address 09: Central Electrical (J519) Label file: . DRV\6R0-937-08x-09.clb
Part Number SW: 6R7 937 087 H HW: 6R7 937 087 H
Component: PQ25 BCM H12 0022
Revision: -1------ Serial Number: 1002480801
Encoding: 240002380C010000003008003C0A04C40080412E600000003000
Operating Number: WSC 32345 000 1048576
VCID: 499EDBE1E00914C515-801C

Subsystem 1 - Part Number SW: 6R0 959 801 M HW: 6R0 959 801 M Label file: 6R0-959-801.CLB
Component: J386__TSG_FT 002 3321
Serial Number: --------------------
Encoding: 100000

Subsystem 2 - Part Number SW: 6R0 959 802 P HW: 6R0 959 802 P Label file: 6R0-959-802.CLB
Component: J387__TSG_BT 002 3325
Serial Number: --------------------
Encoding: 000000

Subsystem 3 - Part Number SW: 6R0 959 811 D HW: 6R0 959 811 D
Component: J388__TSG_HL 002 3321
Serial Number: --------------------
Encoding: 100000

Subsystem 4 - Part Number SW: 6R0 959 812 D HW: 6R0 959 812 D
Component: J389__TSG_HR 002 3321
Serial Number: --------------------
Encoding: 100000

No fault code(s) found.

-------------------------------------------------------------------------------
Address 10: Parking Assist 2 (J446) Label file:| DRV\7E0-919-475.clb
Part Number SW: 7E0 919 475 B HW: 7E0 919 475
Component: PARKHILFE 4K H10 0010
Revision: -------- Serial Number: 24531100503048
Encoding: 118003
Operating Number: WSC 95555 115 65579
ASAM Dataset: EV_VW75XParkAssis4K A01005
ROD: EV_VW75XParkAssis4K_A01.rod
VCID: 316E930160994C053D-8064

No fault code(s) found.

-------------------------------------------------------------------------------
Address 15: Airbag (J234) Label file:| DRV\5K0-959-655.clb
Part Number SW: 2H0 959 655 B HW: 2H0 959 655 B
Component: VW10Airbag00B H06 0013
Revision: -------- Serial Number: 003HN002YS5Q
Encoding: 0000000000000000000000000000000

The intake air path from the turbocharger to the intake manifold has been checked.

Hello,

On the back of the engine, a corrugated pipe (AGR) connects from the exhaust manifold/turbocharger inlet side.

If this is broken or detached, the engine will not only smell terrible when stationary, but the turbocharger will also not receive any power.

A lift is required to access it.

Best regards, Rainer

Okay, I've also checked that, and it's fine.

What's surprising me is that I'm not getting an error message like "Loading pressure limit exceeded."

I've tried searching online for the error, but I haven't found anything really helpful.

Hi,

You're not mentioning the performance under load (i.e., under pressure). Could you also record the boost pressure from idle - light load - full load?

For example, if the compressor bypass malfunctions, you'll get too little air into the engine at idle and with light load. This is just a thought based on reading the VW Bi-Turbo description.

Does the wastegate function (close)?

hg
Herbert

He drives like a diesel engine.
Where should the bypass valve be located? I only know this valve from the T5 biturbo. I couldn't find anything about this valve on the Amarok.

The wastegate is closing. I removed the particulate filter and checked it, as one of my initial suspicions was a faulty flap.

I can gladly log the boost pressure while driving later this afternoon, once I have reassembled everything.

This could be complete nonsense, I remember seeing a video about car doctors where they had problems with a T5 or T6, the cause was the small turbocharger that wasn't producing enough pressure...

As I said, this could be nonsense.

The "little turbo" wave is smooth and has minimal play.

That's exactly how it was in the video, unfortunately, no cause was mentioned...

Hi,

it's possible that the Bi-turbos differ between the T5 and Amarok. I was only able to examine the topic in two SSPs (Service Specifications). One was for the T5 engine and the other for the EA288 engine. And even for the latter, there is a vacuum-controlled bypass (Wastegate) for each of the two turbos on the exhaust side, and a bypass for the high-pressure compressor. And the error could be in one of these three starters.

Do you have a diagram of the charging system? Please link an image due to copyright.

hg
Herbert

Okay, I removed the bypass valve today; it was in good condition and didn't seem to be stuck or anything.

I only have one SSP from a T5 2.0 BITDI.

The setup seems to be identical.
The large turbocharger has a wastegate, while the smaller one is controlled by a valve in the manifold.
Both vacuum housings are functioning properly, or the rods are easy to move.

Take a look at the "Soll" and "Ist" values for air mass to see if you can identify any leaks. It's best to create a log.

The LMM values are normal when measured at rest.

I will go back tomorrow and log the Ladedruck and LMM soll and is values.