Hi , i have a PO299 underboost issue i cant get to the bottom of.
i have borrowed a copy of VCDS and ran the codes, its has stated as follows :
vw crafter 2.0 - daua 2019 fwd
drives fine98% of the time, but suffers a po299 underboost when crusing at about 65mph.
drive fine under soft driving, drives fine under heavey footed driving, just doesnt like cruising or easing off ?
i have so far,
tested the vacum to n75 - 25mmhg
tested the vaccum line to turbo - it holds at 20mmhg
replaced the N75 valve
inspected all vac hoses, which seem fine.
looked that the waste gate actuator, it seems to move freely on vac but does have just a tiny amount of "play" in the linkage when closed. (suspect)
looked at egr valve, its clear and the valve itself functions on demand
looked at the egr inlet and oulet hoses, i replaced them and the gaskets both ends.
looked at intercooler hoses, all good, clean inside.
done forced regen on dpf, seems fine.
i do have an exhast leak somewhere, i can semll it, and just today i visably saw a faint trace of smoke coming from either the turbo or the exhaust manifold, i just couldnt trace it![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
it stinks rich at tick over.
i have borrowed a copy of VCDS and ran the codes, its has stated as follows :
vw crafter 2.0 - daua 2019 fwd
drives fine98% of the time, but suffers a po299 underboost when crusing at about 65mph.
drive fine under soft driving, drives fine under heavey footed driving, just doesnt like cruising or easing off ?
i have so far,
tested the vacum to n75 - 25mmhg
tested the vaccum line to turbo - it holds at 20mmhg
replaced the N75 valve
inspected all vac hoses, which seem fine.
looked that the waste gate actuator, it seems to move freely on vac but does have just a tiny amount of "play" in the linkage when closed. (suspect)
looked at egr valve, its clear and the valve itself functions on demand
looked at the egr inlet and oulet hoses, i replaced them and the gaskets both ends.
looked at intercooler hoses, all good, clean inside.
done forced regen on dpf, seems fine.
i do have an exhast leak somewhere, i can semll it, and just today i visably saw a faint trace of smoke coming from either the turbo or the exhaust manifold, i just couldnt trace it
it stinks rich at tick over.
Code:
Saturday,29,June,2024,11:59:27:29578
VCDS Version: Release 24.5.0 (x64) Running on Windows 11 x64
[URL='http://www.ross-tech.com']www.Ross-Tech.com[/URL]
Address 01: Engine Labels: 04L-907-309-V2.CLB
Control Module Part Number: 04L 906 056 NB HW: 04L 907 445 C
Component and/or Version: R4 2.0l TDI H01 6116
Software Coding: 001940346324050800000000000000000000000000000000
Work Shop Code: WSC 00069 790 00016
ASAM Dataset: EV_ECM20TDI03004L906056NB 005005 (VN54)
ROD: EV_ECM20TDI03004L906056NB_005.rod
VCID: 7AA6987C6C58617A197-802E
4 Faults Found:
23957 - Boost Pressure Regulation
P0299 00 [00100111] - Control Range Not Reached
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 209628 km
Date: 2024.06.28
Time: 19:04:13
Engine RPM: 2464.50 /min
Normed load value: 94.5 %
Vehicle speed: 97 km/h
Coolant temperature: 89 °C
Intake air temperature: 18 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.914 V
Unlearning counter according OBD: 40
Charge air pressure: specified value: 2.195 bar
Charge air cooler inlet: pressure sensor 1 bank 1: raw value: 1613 mbar
Mass airflow sensor 1 bank 1 airflow: raw value: 793.7 mg/stroke
Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value: -20.81 %
Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 46.06 %
Turbine actuator 1 bank 1: posit.feedback - Actual value: 98.80 %
Mean injection quantity: 26 mg/stroke
Air cleaner degree of soiling: 0.00 %
Turbocharg.2 compress.outlet: press.sensor 1 bank 1: raw value: 0 mbar
Turboc.1 turbin.bypass valve 1 B. 1: pos.feedback - Actual value: 0.00 %
25958 - Boost Pressure Regulation
P0299 00 [10100111] - Control Range Not Reached
MIL ON - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 209628 km
Date: 2024.06.28
Time: 19:04:13
Engine RPM: 2463.75 /min
Normed load value: 58.4 %
Vehicle speed: 97 km/h
Coolant temperature: 89 °C
Intake air temperature: 18 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.914 V
Unlearning counter according OBD: 40
Charge air pressure: specified value: 2.195 bar
Charge air cooler inlet: pressure sensor 1 bank 1: raw value: 1613 mbar
Mass airflow sensor 1 bank 1 airflow: raw value: 794.8 mg/stroke
Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value: -20.66 %
Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 45.92 %
Turbine actuator 1 bank 1: posit.feedback - Actual value: 98.80 %
Mean injection quantity: 27 mg/stroke
Air cleaner degree of soiling: 0.00 %
Turbocharg.2 compress.outlet: press.sensor 1 bank 1: raw value: 0 mbar
Turboc.1 turbin.bypass valve 1 B. 1: pos.feedback - Actual value: 0.00 %
15906 - Glow Plug Control Module
P064C 00 [00100111] - -
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 2
Fault Frequency: 1
Mileage: 209632 km
Date: 2024.06.29
Time: 11:35:06
Engine RPM: 854.25 /min
Normed load value: 28.2 %
Vehicle speed: 0 km/h
Coolant temperature: 15 °C
Intake air temperature: 19 °C
Ambient air pressure: 1000 mbar
Voltage terminal 30: 13.867 V
Unlearning counter according OBD: 40
Pre-glow time: 2.5 s
Glow status: Post-heat
Outside temperature sensor 1: B1: raw value: 15.5 °C