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Dan J Reed
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25080 posts

Stinkville NJ
95 Golf Sport, 1987 VW Westy, 98 Jetta GLS - Life is best lived with 2.0s or less...

 DIY - MAF Testing.« »

Step 1 - Throw antiquated worthless system tests in the Bentley boat anchor in the trash.

You'll need:

1 unfolded safety pin, 2 jumper wires, and a DVOM.

Got them?

Good.

Lets begin.

Looking from the FRONT of the car to the BACK of the car... there are 4 wires off the MAF.

See them?

Good, unhook the MAF the connector.

Ground one side of your meter to the intake manifold.
(NOTE IT WILL STAY GROUNDED FOR ALL THE TESTS IN THIS SECTION!)

Take your safety pin and stick it into the FRONT of the MAF harness. Insert it into PIN 3.

Turn the Ignition ON in the car. DO NOT START THE CAR, JUST TURN THE IGNITION ON!

You should get 12 volts or higher. (Battery voltage). If not, check the ECU and harness wires back at the ECU. This is the 12 volts sent to the MAF from the ECU to power the MAF.

TURN THE CAR OFF.
---
Set the meter to read OHMS. LEAVE THE CAR OFF!

Next, move the safety pin to pins 1 and 2. (do one at a time, same test…)

These are the internal grounds for the sensor, power and signal. You should get LESS then 3-4 ohms on BOTH pins. If you get MORE then 3-4 ohms check the harness for breaks or opens, or the connector at the ECU for damage.
---
Last test, Pin 4.

MAF signal return to ECU.

Remove your safety pin from the MAF sensor harness.

Set the DVOM to read Volts DC again.

Plug the MAF sensor back in.

BACKPROBE the RED wire, PIN 4 on the MAF sensor. Use the safety pin to SLIDE the probe down the wire into the connector base. The point is NOT to break the wires insulation.

START the CAR. Yes, RUN the CAR. Yes, with the safety pin JAMBED into the wire harness.

Voltage at IDLE should be around .9 volts DC.

Use this handy, dandy chart as a guide:

Idle .9 volts.

2000/3000 RPM 1.5 volts.

3000/Wide Open = up to 3.8 volts.

Note the speed at which the MAF can respond to the changes and airflow.

If your MAF is slow, or lazy, or does not match these values. Good chance its bad.


From dan53:


I was unable to get a power voltage reading on pin 3 while testing my MAF at first, but then I did a little research and found that on later model OBDII cars that the engine must be running versus the ignition being just switched to On to get a power reading. This could have saved me about an hour if I knew this! Dan J Reed, I implore you to make a modification to your MAF DIY test and mention this to save someone else the trouble in the future.
"




Modified by Dan J Reed at 9:09 PM 10-2-2008



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CSFiend
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 Re: DIY - MAF Testing. (Dan J Reed) »« »

i don't even have a dub anymore and i DJR.



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JettaGLXdriver
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Aurora CO
1995 Jetta GLX VRT6

  »« »

Nice DIY.

Now if my car just had a MAF.. HEHE



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Da_Mount
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 Re: DIY - MAF Testing. (CSFiend) »« »






burton05401
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607 posts

Bethel CT
'95 GTI VR6-parted out, 2008.5 mazdaspeed3

 Re: DIY - MAF Testing. (Dan J Reed) »« »

nice work dan! now i can actually prove to myself that maybe it really is time to buy a new mfa lol
Dan J Reed
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Stinkville NJ
95 Golf Sport, 1987 VW Westy, 98 Jetta GLS - Life is best lived with 2.0s or less...

 Re: DIY - MAF Testing. (burton05401) »« »

Bump for Saturday.

http://www.youtube.com/watch?v=Ierw8eAsw_g



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reynolds9000
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Huntsville AL

 Re: DIY - MAF Testing. (Dan J Reed) »« »

good to know!




safety first, then teamwork.


ether42
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b_town illinois

  »« »

dan FTW
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discount to pick up a new multi meter
Slorvex
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Hebron Indiana
1994 Volkswagon Jetta III GL

 Re: (ether42) »« »

Dan your awsome, there should be more like you. Now to get my car to start to do this test lol.



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manchesthair cT
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 Re: (Slorvex) »« »

thanks dan.



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Bmore15
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 Re: DIY - MAF Testing. (Dan J Reed) »« »

Quote, originally posted by Dan J Reed »
Bump for Saturday.

http://www.youtube.com/watch?v=Ierw8eAsw_g


nice video, i like when he shoots the meatloaf


and yet another DIY nice work



Quote, originally posted by dubraycer36 »

"Yo Dawg! We heard you like to rob stuff. So we stole your stuff, while you were stealin' our stuff, so you could get robbed while you were doin the robbin'."

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After doing 3 lines of coke and getting trahshed on PBR, i didn't think my evening could get any worse.

Then i opened this thread.



Davespeed
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 Re: DIY - MAF Testing. (Bmore15) »« »

Damn Dan....



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georgekelp
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 Re: DIY - MAF Testing. (Davespeed) »« »

You should find out what the g/s reading is supposed to be on a well functioning MAF.




Thumper1044
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Long Beach CA
1997 VW Golf, 1989 VW Golf, 1998 Caddy, 1960 T-Bird

 Re: DIY - MAF Testing. (Dan J Reed) »« »

Hi Dan:
Great write up and I love the pics. I have the 97 golf, 2.0. When I checked pin 3 for batt. voltage with the ign on, it wasn't there. Kept chasing down the wires. Then someone wrote that maybe the car needs to be started. When I started the eng., I got the 12+v. I think VW may have tied in an interlock so the MAF does not get powered up unless the eng. is running.
Just one of the many many checks I made trying to get mine to run.
Thumper
vw_love
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trek.

 Re: DIY - MAF Testing. (CSFiend) »« »

Quote, originally posted by CSFiend »
i don't even have a dub and i DJR.

fixed for my situation



Quote, originally posted by hurt »
Dance puppetboy if you do a good job
Then they'll want you again, give it all that you got
But laugh, clownboy, laugh 'cause it's always so pleasing

Dan J Reed
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Stinkville NJ
95 Golf Sport, 1987 VW Westy, 98 Jetta GLS - Life is best lived with 2.0s or less...

 Re: DIY - MAF Testing. (Thumper1044) »« »

Quote, originally posted by Thumper1044 »
Hi Dan:
Great write up and I love the pics. I have the 97 golf, 2.0. When I checked pin 3 for batt. voltage with the ign on, it wasn't there. Kept chasing down the wires. Then someone wrote that maybe the car needs to be started. When I started the eng., I got the 12+v. I think VW may have tied in an interlock so the MAF does not get powered up unless the eng. is running.
Just one of the many many checks I made trying to get mine to run.
Thumper

Weird. I'll have to test that on the OBDII ABA I have.



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Sandlock
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 Re: (Pf3il) »« »

Quote, originally posted by Pf3il »
thanks dan.




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Slow Jet
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 Re: (Sandlock) »« »

Time to check this out. If from a standing start I floor the gas the engine bogs down for a split second then starts going along. Then I'll check the timing.



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24Spud
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Uk
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 Re: DIY - MAF Testing. (Dan J Reed) »« »

dont surpose you have a test i can try for the 3 pin hitachi Maf meter?
Dan J Reed
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95 Golf Sport, 1987 VW Westy, 98 Jetta GLS - Life is best lived with 2.0s or less...

 Re: DIY - MAF Testing. (24Spud) »« »

Quote, originally posted by 24Spud »
dont surpose you have a test i can try for the 3 pin hitachi Maf meter?

Sorry I dont, but chances are its a 0-5 volt sensor.





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bugglesride
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Lancaster PA

 Re: DIY - MAF Testing. (Dan J Reed) »« »


The A3 forum must be one of the very best in the whole of any DIY help car forums...I have not found ANYTHING like this with regards to ANY other car make...makes me glad to be a part of the old school dub club...

Great post Dan. A TEN!

I wish they would "sticky" stuff like this at least for a while.

Brass Monkey013
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Farmington CT
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 Re: DIY - MAF Testing. (Dan J Reed) »« »

great write up, proved my MAF was bad, dont feel so bad now about buying another now that im sure
FL 2.0L
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  »« »

Coulda used this several months ago. Would have been cheaper than the code reader...




jhayesvw
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1996 Golf 4 door VRT

 Re: (FL 2.0L) »« »

Perhaps i missed it, but does this work with obd1 or obd2, 2.0 or vr6 since they are the same sensor??
thanks



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 Re: (jhayesvw) »« »

to Dan J Reed's DIY

Bentley didnt tell me zhit on how to take off the front sway bar for my VR so I looked up Dan and sure enough had one on his site



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Lito H
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north las vegas nv
1993 VW Golf

 Re: DIY - MAF Testing. (Dan J Reed) »« »

I just read your write up about the MAF. I'm new to the watercooled scene and am having a problem with my 93 Golf surging when driving at steady rpm. Could the MAF be my problem?
jaysvw
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 Re: DIY - MAF Testing. (Lito H) »« »

.........or you could just unplug it, and if that takes care of the problem you know your MAF is bad. Nice writeup.



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Lito H
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north las vegas nv
1993 VW Golf

 Re: DIY - MAF Testing. (jaysvw) »« »

I will try that the next time it happens.

Thanks, Lito

Das Borgen
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 Re: DIY - MAF Testing. (Lito H) »« »

DAN THE MAN, the reason I joined vwvortex
I love you DAN(no homo)



Buy Ducati

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Damn.
I don't like to compromise, but it sounds like I'm going to have to settle for the Rhino snatch leather.

Quote, originally posted by bum »
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Dan J Reed
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95 Golf Sport, 1987 VW Westy, 98 Jetta GLS - Life is best lived with 2.0s or less...

 Re: DIY - MAF Testing. (Dan J Reed) »« »

bump



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jrbscooch56
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 Re: DIY - MAF Testing. (Dan J Reed) »« »

This DIY is really easy and good for testing the maf accurately.

Good stuff Dan J



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Unit01
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 Re: DIY - MAF Testing. (jrbscooch56) »« »

I love that DVOM.

Good choice!



Quote, originally posted by sunofernest »

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twicepardoned
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Kansas City MO
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  »« »

Maybe I'm retarded but why use the jumper wires or the paper clips???



1996 240sx... World's Fastest Stock Block/Head KA-T Spring 2010
Dan J Reed
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Stinkville NJ
95 Golf Sport, 1987 VW Westy, 98 Jetta GLS - Life is best lived with 2.0s or less...

 Re: (twicepardoned) »« »

Quote, originally posted by twicepardoned »
Maybe I'm retarded but why use the jumper wires or the paper clips???

So you can gain access to the harness pins while the MAF is running.

Otherwise your cutting and hacking a factory harness thats 10 years old at best.



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PetesVW
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1995 Volkswagen Jetta III

 Re: DIY - MAF Testing. (Dan J Reed) »« »

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