P0101 MAF Implausible Signal - 000257

**tdiblacky** · 16-08-2023,07:06 PM

Code:

Tuesday,15,August,2023,19:28:59:41611
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 23.3.1.0 (x64)
Data version: 20230421 DS346.2
Ross-Tech: Home

Mileage: 332430km-206562mi   Repair Order: 15thAug23

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Chassis Type: 1K-VW35 (1K0)
Scan: 01 03 08 09 15 16 17 19 25 37 42 44 46 52 56 76

Mileage: 332430km-206562miles

01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: Malfunction 0010
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
37-Navigation -- Status: Malfunction 0010
42-Door Elect, Driver -- Status: Malfunction 0010
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: Malfunction 0010
56-Radio -- Status: OK 0000
76-Park Assist -- Status: OK 0000
 
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Address 01: Engine        Labels: 03G-906-016-BKD.clb
   Part No SW: 03G 906 021 PP    HW: 03G 906 021 AN
   Component: R4 2,0L EDC  000SG  4661  
   Revision: --H08---    Serial number: VWX7Z0H23N48PV
   Coding: 0000072
   Shop #: WSC 00450 210 62666
   VCID: 7CF78F313F49EC7397-8028
   VINID: 9E69EAAAA05BA889C22010C018AABB9A00

1 Fault Found:
000257 - Mass Air Flow Sensor (G70) 
               P0101 - 000 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01110000
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 255
                    Mileage: 332161 km
                    Time Indication: 0
                    Date: 2000.00.00
                    Time: 06:32:46


             Freeze Frame:
                    RPM: 1638 /min
                    Speed: 86.0 km/h
                    Temperature: 15.3°C
                    Absolute Pres.: 1050.6 mbar
                    Mass Flow: 31.29 g/s
                    (no units): 0.78
                    Temperature: 84.6°C


Readiness: 1 1 0 0 0 


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Address 03: ABS Brakes        Labels: 1K0-907-379-MK60-F.clb
   Part No SW: 1K0 907 379 AC    HW: 1K0 907 379 AC
   Component: ESP FRONT MK60      0101  
   Revision: 00H11001    
   Coding: 0023170
   Shop #: WSC 01279 785 00200
   VCID: 73E5A40D1217A30BC6-8026


No fault code found.


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Address 08: Auto HVAC        Labels: 1K0-820-047.lbl
   Part No SW: 1K0 820 047 HN    HW: 1K0 820 047 HN
   Component: Climatic PQ35   142 1111  
   Revision: 00142031    Serial number: 00000000000000
   Shop #: WSC 00000 000 00000
   VCID: 77FD901D066FCF2BFA-8022


No fault code found.


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Address 09: Cent. Elect.        Labels:. 3C0-937-049-30-H.lbl
   Part No SW: 3C0 937 049 AJ    HW: 3C0 937 049 AJ
   Component: Bordnetz-SG     H54 2202  
   Revision: 00H54000    Serial number: 00000008088724
   Coding: E5898F2700041500471400001400000000087F075C000100000000000000
   Shop #: WSC 12345 785 00200
   VCID: 71E9AE05680B911B34-8024


   Subsystem 1 - Part No: 1K2 955 119 E  Labels: 1KX-955-119.CLB
   Component: Wischer 260208 021  0501  
   Coding: 00038805
   Shop #: WSC 12345  


   Subsystem 2 - Part No: 1K0 955 559 AF  Labels: 1K0-955-559-AF.CLB
   Component: RLS     120308 046  0204  
   Coding: 02306085
   Shop #: WSC 12345  


1 Fault Found:
01496 - Bulb for Fog-Lamps; Left (L22) 
            010 - Open or Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00101010
                    Fault Priority: 4
                    Fault Frequency: 1
                    Reset counter: 80
                    Mileage: 331127 km
                    Time Indication: 0
                    Date: 2005.09.13
                    Time: 31:63:63


             Freeze Frame:
                        ON
                    Voltage: 14.20 V
                        ON
                        ON
                        OFF
                        OFF
                        OFF




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Address 15: Airbags        Labels: 1K0-909-605.lbl
   Part No SW: 1K0 909 605 T    HW: 1K0 909 605 T
   Component: 38 AIRBAG VW8   020 2300  
   Revision: 05020000    Serial number: 0038PD1UHYFH  
   Coding: 0013112
   Shop #: WSC 01269 785 00200
   VCID: 3D71423564D3257BE0-8068


   Subsystem 1 - Serial number: 6332MSME2A2114775


   Subsystem 2 - Serial number: 6342MSME2A2114563


   Subsystem 3 - Serial number: 6352QSME536D1859R


   Subsystem 4 - Serial number: 6362QSME53392F71N


No fault code found.


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Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
   Part No SW: 1K0 953 549 BN    HW: 1K0 953 549 BN
   Component: J0527           752 0100  
   Coding: 0000012
   Shop #: WSC 01279 785 00200
   VCID: 7F0D783D2E5FF76BB2-802A


4 Faults Found:
00576 - Terminal 15 
            012 - Electrical Fault in Circuit - Intermittent
00883 - Ignition Switch (D) Terminal S 
            012 - Electrical Fault in Circuit - Intermittent
00884 - Ignition Switch (D) Terminal X 
            012 - Electrical Fault in Circuit - Intermittent
01744 - Ignition Switch Terminal P (D) 
            012 - Electrical Fault in Circuit - Intermittent


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Address 17: Instruments        Labels: 1K0-920-xxx-17.lbl
   Part No SW: 1K0 920 964 B    HW: 1K0 920 964 B
   Component: KOMBIINSTRUMENT VDD 1212  
   Revision: V0002000    Serial number: VWX7Z0H23N48PV
   Coding: 0005403
   Shop #: WSC 00000 011 205300
   VCID: 2C577F718FA9BCF347-8078


No fault code found.


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Address 19: CAN Gateway        Labels:. 1K0-907-530-V3.clb
   Part No SW: 1K0 907 530 L    HW: 1K0 907 951 
   Component: J533  Gateway   H07 0052  
   Revision:   H07 01    Serial number: 290208F2001431
   Coding: E9801F0E4002020001
   Shop #: WSC 44673 233 19254
   VCID: 306F6B01A381D8137B-8064


No fault code found.


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Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
   Part No SW: 1K0 920 964 B    HW: 1K0 920 964 B
   Component: IMMO            VDD 1212  
   Revision: V0002000    Serial number: VWX7Z0H23N48PV
   Shop #: WSC 00000 000 00000
   VCID: 2C577F718FA9BCF347-8078


No fault code found.


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Address 37: Navigation (J794)       Labels:| 1K0-035-27x-37.clb
   Part No SW: 3C8 035 279 M    HW: 3C8 035 279 M
   Component: RNS315-EU   H70 0407  
   Serial number: VWZAZ2N0350421
   Coding: 0400040104000F0000019002
   Shop #: WSC 00015 115 00000
   ASAM Dataset: EV_RNS315EUV2UDS 001705
   ROD: EV_RNS315EUV2UDS.rod
   VCID: 35615A1594E3FD3B28-8060


   Data carrier: 
   Subsystem 1 - Part No: 3AA 919 866 
   Component: EUR_W_V4  0050 


2 Faults Found:
1048629 - Aux IN Socket 
          B1104 13 [009] - Open Circuit
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 28
                    Mileage: 331495 km
                    Date: 2000.00.00
                    Time: 20:18:45


1048636 - Digital Radio Antenna 
          B1103 13 [009] - Open Circuit
          Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 5
                    Fault Frequency: 1
                    Reset counter: 70
                    Mileage: 257558 km
                    Date: 2000.00.00
                    Time: 11:22:28




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Address 42: Door Elect, Driver        Labels:. 1K0-959-701-MAX3.clb
   Part No SW: 1K0 959 701 N    HW: 1K0 959 701 N
   Component: Tuer-SG         006 1208  
   Coding: 0000564
   Shop #: WSC 01279 785 00200
   VCID: 3979562570FB195BCC-806C


1 Fault Found:
00109 - Left Mirror Turn Signal Lamp (L131) 
            012 - Electrical Fault in Circuit - Intermittent


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Address 44: Steering Assist        Labels: 1Kx-909-144-G2V3.clb
   Part No: 1K2 909 144 M
   Component: EPS_ZFLS Kl.069 H08 1901  
   Shop #: WSC 00000 028 00001
   VCID: 36635D1941E5F62321-8062


No fault code found.


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Address 46: Central Conv.        Labels:. 1K0-959-433-MIN.clb
   Part No: 1K0 959 433 AJ
   Component:    KSG              0401  
   Coding: 00C802085B2D840548DAC69010CC
   Shop #: WSC 12345 785 00200
   VCID: 78FF93210B71C053F3-802C


   Subsystem 1 - Part No: 1K0 951 605 D
   Component: LIN BACKUP HORN H08 9001


   Subsystem 2 - Part No: 1K0 951 178 A
   Component: Neigungssensor  003 0203


   Subsystem 3 - Part No: 1K0 951 178 A
   Component: Innenraumueberw.003 0203


No fault code found.


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Address 52: Door Elect, Pass.        Labels:. 1K0-959-702-MAX3.clb
   Part No SW: 1K0 959 702 N    HW: 1K0 959 702 N
   Component: Tuer-SG         006 1208  
   Coding: 0000820
   Shop #: WSC 01279 785 00200
   VCID: 3A7B492975FD1243C5-806E


2 Faults Found:
00097 - Front Passengers Central Locking (Safe) Motor (V162) 
            012 - Electrical Fault in Circuit
00929 - Locking Module for Central Locking; Front Passenger Side (F221) 
            008 - Implausible Signal


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Address 76: Park Assist        Labels: 1K0-919-283.lbl
   Part No: 1K0 919 283 A
   Component: 22 Einparkhilfe     0101  
   Shop #: WSC 00000 000 00000
   VCID: 2D517275B4B3B5FB50-8078


No fault code found.


End-------------------------(Elapsed Time: 01:46)--------------------------


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Address 01: DTCs cleared

I have a fault as seen on my VCDS log, relating to the MAF sensor. I have had faulty wiring at the boost sensor which I repaired but still have the MAF error. It doesn't go into limp mode when the EML is displayed. I replaced the MAF too and same problem still here.

I have a cycle where I get the EML on after about 100 miles after I clear the fault code.
Can anyone tell me what volts I should have on the wires to my MAF sensor and what wires they are?
Which wire is the ground, etc...
I think I need to check for a 12v, 5v and an earth, what's the other wire do?

With VCDS can I check what value the MAF is reading and what should it be reading, can anyone tell me?

Is implausible signal an electrical issue with the wiring or is this terminology also used to describe if the amount of air measured by the MAF is too little or too high? Or in the latter, where the amount of air is measured to be too low / high would it state something like Too low / Too high air pressure, etc?

**tdiblacky** · 17-08-2023,08:48 PM

My MAF is a 5pin connector but only has 4 wires.
Would someone be able to tell me, is the MAF on a bkd 2L of the frequency type or varying type. If I put my multimeter on the signal wire should it's volts go up and down as I rev the car and let the revs off?

I'll try dig out it's wiring diagram now on ELSAWIN.

I found the wiring diagram for the MAF sensor to the ECU, as in pic below, from Elsawin. It gives me the 4 wire colours and the pins they go to on the ECU and Maf connector. G70 is the MAF in the below pic.

However, it doesn't tell me what each individual wire actually does / is, can anyone here tell me?

**Crasher** · 18-08-2023,11:57 AM

Pin 2 is the power feed from the dash side fuse SC8 current track 95 on page 8 goes to curent track 23 on page 3, this is for a May 2006 onwards BKD.

**tdiblacky** · 18-08-2023,02:23 PM

Thanks Crasher. Could you tell me should the voltage on the signal wire fluctuate as I rev the car?

Also, is there a value I can compare and check against the Maf reading in VCDS to see ifs giving a realistic or in spec value?

**tdiblacky** · 09-09-2023,10:55 PM

I'm still having this issue.

1 Fault Found:
000257 - Mass Air Flow Sensor (G70)
P0101 - 000 - Implausible Signal

I checked the wiring values at the pins of the Maf, here's their results. It's a 5pin Maf but only 4 wires actually used:

1 = No wire
2 = 14v
3 = Earth
4=5v
5= Earth

When I rev the car the pin4 5V doesn't fluctuate in value, it just stays at 4.99/5v. Is this behaving correctly or should it's voltage decrease / increase from 0-5v range?

When I disconnect the MAF with the car running at idle what should happen? And also when driving with MAF disconnected what should happen?

Is there anything else I can check? Maybe something in VCDS to help highlight a problem?

**Crasher** · 10-09-2023,12:30 PM

Where did the new Air mAss Meter come from?

**tdiblacky** · 10-09-2023,07:19 PM

It came from a reputable parts supplier, NTK brand. I know everyone says only use a genuine VW one but it's in it now.

I don't really see the point of putting another MAF in the car without testing the basics of this MAF first. No one seems to know if the 5v should fluctuate between 0-5v when the car is revved? Some MAF's behave like this, some don't from what I have researched but I don't know which behaviour our VW's or more specifically a BKD golf should show? Do you know, Crasher? There's no point putting a genuine MAF in now if I can't first determine if the 5v should fluctuate when revved.

I don't think this is a wiring issue now, I have checked and repaired the wires and they seem to be operating properly and showing as earths and 12v + 5v as I believe they should. Just not sure if the 5v should fluctuate or not?

**tdiblacky** · 10-09-2023,11:00 PM

Ok, from reading more into this MAF testing, I see the 2 types of MAF output can be either a varying 0-5v range or the output could be a digital pulse which I will need to measure with the Hz hertz setting on my multimeter whilst revving the engine. I'll check that tomorrow with the engine ideling and being revved.

So my 4 wires seem to be:
- constant 12v for the MAF itself
- earth for the Maf's 12v
- output signal wire 5v or digital pulse
- earth for the output signal

Does these 4 wires that I am assuming relate to the above make sense, seem correct? 2 earths, a 12v and a 5v output wire?
Is the 12v supply for the intake temperature part of the sensor, these VW MAF's have an inbuilt air temp sensor I think?

**tdiblacky** · 11-09-2023,10:39 PM

I tested the MAF readings this evening, it seems to be giving good values. And the grams/second g/s value at idle doubled as I doubled the revs as I believe it should.
My engine off reading was 0.113g/s. My idle reading was 1.009lb/min or 7.55g/s and at 1800 revs or double idle approx, the reading doubled to 2.017lb/min or 15g/s. I believe if you double the revs the Maf value should double also.
3000 Rpm read value of 5lb/min = 38g/s.

I'll check the Hertz frequency reading with my multimeter tomorrow.

I'm suspecting a hose leak now, I see my Intercooler turbo hose where it goes into the EGR or Anti shudder valve is loose, the tab is worn and the hose won't stay in, I've a new hose ordered but will be a week arriving. I have had this issue before this hose became loose so I don't think it's the root cause but obviously it's not helping so I'll fix that and look for more leaks, etc..

I think these readings / values I obtained this evening are indicating a properly working MAF sensor, what do ye folk think? Anyone have the VW spec values to hand to compare with?

**tdiblacky** · 27-09-2023,06:56 PM

I replaced the intercooler hose with a new one between Egr / Asd and the intercooler hard pipe and cleared the code but the EML came back after about 100 miles as usual. So i can rule out the hose.

I would of thought they're be loads of knowledgeable folks on this forum for helping with troubleshooting MAFs, A VW Maf is a very common failure isn't it. Or is it starting to look like a lot get changed unnecessarily.

Is the face the EML and Maf code always comes back on around the same amount of driving time after clearing suggesting it's an electrical issue?