Fault code 30251 & 27202 [Resolved]

[Will I am]

Hi, I'm having an issue with my van, the EML is on and glow plug light is flashing and i have 2 faults. I removed the boost pressure sensor and it was clogged with soot, I cleaned it but that didn't have any effect so I have one coming on tuesday, but the 2nd fault with the "open circuit message is there as well. Can anyone shed any light on this or point me in the right direction for where to start checking. Cheers

Sunday,10,March,2024,07:33:12:50404
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 8 x64
VCDS Version: 23.11.0.0 (x64)  HEX-NET CB: 0.4643.4
Data version: 20240205 DS351.0
www.Ross-Tech.com





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                Address 01: Engine       Labels: 
Control Module Part Number: 
  Component and/or Version: 
           Software Coding: 
            Work Shop Code:   
                      VCID: 55E28882ACC5B239C0-FFFE
Fault Codes have been Erased

2 Faults Found:
30251 - Manifold Pressure / Boost Sensor (G31) 
          P0236 00 [10100011] - Implausible Signal
          MIL ON - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 176613 km
                    Date: 2078.01.12
                    Time: 10:45:17

                    Engine RPM: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 14 °C
                    Intake air temperature: 11 °C
                    Ambient air pressure: 980 mbar
                    Voltage terminal 30: 11.921 V
                    Unlearning counter according OBD: 40
                    Absolute intake pressure: 37 kPa abs
                    Air filter outlet: pressure sensor 1 bank 1: raw value: 981 mbar
                    Turbocharg.2 compress.outlet: press.sensor 1 bank 1: raw value: 0 mbar
                    Ambient air pressure sensor 1 bank 1: raw value: 0.980 bar
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 100.00 %
                    Engine status: Stop
                    Outside temperature sensor 1: B1: raw value: 7.0 °C
                    Filtered value of IN_Dpf_dp_raw-CDPF Delta Pressure in hPa: 0.000 hPa
                    Particle filter: air pressure sensor 1 bank 1: raw value: 0.0 mbar
                    Accelerator pedal travel: raw value: 0.00 %

27202 - Sensor Reference Voltage A 
          P0641 00 [10100011] - Open Circuit
          MIL ON - Not Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 176613 km
                    Date: 2078.01.12
                    Time: 10:45:17

                    Engine RPM: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 14 °C
                    Intake air temperature: 11 °C
                    Ambient air pressure: 980 mbar
                    Voltage terminal 30: 11.710 V
                    Unlearning counter according OBD: 40
                    Engine status: Stop
                    Engine running time-Pressure BIN10 bar: 0 s
                    Control Module temperature: 14.7 °C
                    ESM_Battery_voltage-Voltage: 11.71 V
                    Low battery mode active-Bool type: No
                    ESM_Vext_raw-ESM_sensor_voltage: 3.2891 V
                    Starter control: terminal 50 feedback-Terminal 50 on CAN: not active
                    Starter control: terminal 50 feedback-Terminal 50 CAN valid: active
                    Starter control: terminal 50 feedback-Terminal 50 via cable: not active
                    Starter control: terminal 50 feedback-Starter relay: not active
                    Starter control: terminal 50 feedback-Starter operation read back wire T50Ret: not active
                    Starter control: terminal 50 feedback: 8
                    Starter control: shut-off conditions 1-Immobilizer: not active
                    Starter control: shut-off conditions 1-Starter shift malfunction: not active
                    Starter control: shut-off conditions 1-Speed: not active
                    Starter control: shut-off conditions 1-Drivetrain: not active
                    Starter control: shut-off conditions 1-Speed: not active
                    Starter control: shut-off conditions 1-RPM aborted starts: active
                    Starter control: shut-off conditions 1-Engag. duration: not active
                    Starter control: shut-off conditions 1-Engag. duration aborted starts: not active
                    Starter control: shut-off conditions 1-Engag. duration panic start: not active
                    Starter control: shut-off conditions 1-new errors: not active
                    Starter control: shut-off conditions 1-manual start/error: not active
                    Starter control: shut-off conditions 1-ignition: not active
                    Starter control: shut-off conditions 1-Clutch error/terminal 50 malfunction: not active
                    Starter control: shut-off conditions 1-Direct start function: not active
                    Starter control: shut-off conditions 1-Engag. duration defrost.: not active
                    Starter control: shut-off conditions 1: 512


Readiness: N/A

Screen shot of the log.

 

[mmi]

A bit of a challenge as there is not much information what's the engine in question.



Please post

(1) full VCDS Auto-Scan​

(2) engine blockmap data - engine stopped (ignition on)​

(3) engine blockmap data - engine idling​

Spoiler: Blockmap capture - How-to

Ignition ON

VCDS > Applications > Controller Channel Map >

Tick/fill boxes as above and hit Go.

VCDS flashes screens for a moment (when finished hit "Done, Go Back") and there will be file blockmap-01-... in folder C:\Ross-Tech\VCDS\Logs\....

Meanwhile - the same fault codes on a T6

Multiple electronic faults, codes warning lights all at once & garage discovered this!

Anybody got the foggiest about what has happened here? 2019 T6 150 DSG 37,000miles 99% motorway Luckily still under warranty Notable Carista fault codes before it went into limp mode & then came out of limp mode & all faults disappeared, then back into limp mode with same faults & some new...

www.t6forum.com

 

[Will I am]

ok, ill do that now cheers

 

[Will I am]

Full scan

 

[Will I am]

ignition on

 

[Will I am]

engine idling. Cheers

 

[mmi]

Thanks - that was quick!

I would start investigating with these below as they are definitely wrong.

The pressure reading should be around 1000 mbar (engine off). The 370 mbar in both indicates more or less sensor is offline (sits at the minmum)
Good thing is VCDS reports also raw voltage seen by ECU - almost none (just some noise on return wire). Would expect to see about 1.0...1.1 Volts.

When the sensor is unplugged you should get 5.00 Volts on the ECU side. On the other hand ECU reports open circuit on the reference voltage circuit thus doesn't see the sensor?

Perhaps just a break in the sensor wiring?



Perhaps something useful/related here:

Fault code help please

Hi guys I have the fault code as listed below and have changed the sensor but still have the fault code showing after reset. I have no loss of power or any other problems apart from the waring lights. would anybody have an idea of what to try next, Thanks.

www.t6forum.com

 

[Will I am]

Ok great, thank you for that. Its much appreciated. So there's 2 pressure sensors I can see, one after the MAF sensor after the airbox and 1 on the inlet manifold. do you know which one this is referring to? When I removed the one on the inlet manifold it was full of soot, I cleaned it out but I also have another one on order. Cheers

 

[mmi]

The sensor on the inlet manifold is the suspect.

G31​

 

[Wills]

Similar to my experience. Turned out to be the wiring harness was damaged due to VW’s poor routing and securing. Pieced out and reinsulated.
It’s a known problem that’s been covered on here I believe.

 

[Will I am]

great, cheers

Similar to my experience. Turned out to be the wiring harness was damaged due to VW’s poor routing and securing. Pieced out and reinsulated.
It’s a known problem that’s been covered on here I believe.

thanks for that, do you know where it was damaged? cheers

 

[Wills]

Actually mine was diagnosed by the VW techie as a pressure sensor issue but turned out to be the temperature sensor as per the attached link SOLVED - Glow plug & Engine Management lights on error code 15898

 

[Will I am]

REPLACED THE SENSOR AND ALL NOW WORKING, CHEERS EVERYONE.