Maf voltage?

[AlexD333]

Does anyone know what the tdi maf voltage should be under load? :nenau

Mine was 3.3v @ 2,500rpm

 

[makeitfit]

It's in the manual mate :thumb2

 

[AlexD333]

It's in the manual mate :thumb2

Thanks, I'll have a search :thumb2
Typical, download don't work...

 

[rayf3262]

Here's a link to the sort of output you should expect:
http://www.nissan4x4ownersclub.com/forum/showpost.php?p=143546&postcount=79

 

[solarman216]

thanks Ray so Alex's at 2500 rpm giving 3.3 volts is too high,whereas my spare giving 2.7 would be better, but this is the one he drove home on, so think something else must be amiss, Rick

 

[rayf3262]

Has a MAF-AMP been fitted?

As standard, you should be measuring around 1.8~2.2V at idle and as per the graph and see a broadly linear increase with engine rpm up to around 2.5~2.8K rpm.

 

[Sweety]

thanks Ray so Alex's at 2500 rpm giving 3.3 volts is too high,whereas my spare giving 2.7 would be better, but this is the one he drove home on, so think something else must be amiss, Rick

Think Alex's truck has the later type MAF fitted like mine has (3L type) & the earlier ones won't work on them IIRC:augie

 

[solarman216]

yes fitted today, as his truck arrived we had as a reference of 1.2 at idle and 3.3 at 2500 revs, tried my spare MAF and it gave around 2.7 at 2500 revs so assumed it was bad, fitted maf amp and with his original maf and no tweek to your supplied setting got 3.4 at 2500 revs so initially left it at that, but as it seemed to hesitate gave it a quarter turn clockwise and got 3,5 that is how he drove it home, I think his maf is bad, what do you think? Rick

 

[rayf3262]

yes fitted today, as his truck arrived we had as a reference of 1.2 at idle and 3.3 at 2500 revs, tried my spare MAF and it gave around 2.7 at 2500 revs so assumed it was bad, fitted maf amp and with his original maf and no tweek to your supplied setting got 3.4 at 2500 revs so initially left it at that, but as it seemed to hesitate gave it a quarter turn clockwise and got 3,5 that is how he drove it home, I think his maf is bad, what do you think? Rick

Initially, I'd say turn it down, the ECU is seeing the increased MAF voltage as "overboost" and dropping to a safe map.
Start at the lowest setting and GENTLY work up.
I doubt the MAF is completely goosed, and is probably serviceable.
I have asked Alex to give me a call tomorrow, and I'll talk him through it.

 

[AlexD333]

Initially, I'd say turn it down, the ECU is seeing the increased MAF voltage as "overboost" and dropping to a safe map.
Start at the lowest setting and GENTLY work up.
I doubt the MAF is completely goosed, and is probably serviceable.
I have asked Alex to give me a call tomorrow, and I'll talk him through it.

Cheers dude I will give you a call :thumb2 just to fill you in on my long story, I have had the symptoms for a while now (loss of power uphill) on the latest Peak District laning trip we had the engine light on all the way down, tried to turn ign off and on again but it came back on, once we arrived it never came on again.

Again yesterday morning I set off, it was very cold and the terrano was frozen! After 5 mins of driving on the a40 the light came on, I pulled over and ign off and on.

When I came to an incline and put my foot down a bit eng light came up,and when overtaking a van later the terrano said no and lost some speed (10mph)

So symptoms were bad before maf amp was on, and also turning it off leaves the same symptoms.

Lastly, when testing my original maf yesterday (after amp was fitted) I had no power on take off, we swapped mafs for ricks *goosed* maf and wala!! She was revving great again.

I'll give you a call once I get to work :thumb2

 

[AlexD333]

Ok pictures, the 061 was the standard one I took out mine.

The other code is the donor rick gave to me off an earlier model :thumb2

 

[AlexD333]

And the older model maf

 

[elty001]

Have you had the fault codes read?
Your symptoms sound very similar to my old tdi and that turned out to be no 1 injector.
If the EML is coming on it should throw up a fault code.

 

[AlexD333]

sorry the 033 is the one out of mine.

 

[rayf3262]

Originally posted by member theron:
<table id="post177953" class="tborder" border="0" cellpadding="6" cellspacing="0" width="100%" align="center"><tbody><tr valign="top"><td class="alt1" id="td_post_177953" style="border-right: 1px solid #D1D1E1"> I've been doing some research on late Bosch type MAFs and hopefully this information will be useful to others. I have a 2005 2.7TDi and the Nissan part number on the MAF sensor housing is 22680-7F406. The housing contains another smaller tube inside the housing that MAF sensor dangles into. A replacment MAF sensor from Nissan is £323.92 +VAT. It is possible to buy genuine Bosch replacement versions for £190 inc VAT.

This sensor differs from the earlier sensor which has part no 22680-7F400. I tried a sensor of this type and it gave amazing low down torque but as soon as the car warmed up it lost all power and I could only get home by disconnecting the MAF sensor and switching the ignition off then starting again.

The 22680-7F406 sensor is also used in the 3.0 Terrano. The Nissan part number refers to the complete unit so the housing and the sensor itself. My research indicated that the corresponding Bosch number was 0281002596 and that this used the sensor insert with Bosch part number F00C 2G2 061.

This sensor insert is also used in other manufacturers MAF sensors. In particular it is used in the 'Vectra C' with Vauxhall part number 93173727 (or Scania part no 24437503) although the housing is wrong. With the correct 5 pointed security bit you can remove the sensor to examine and swap it. A new genuine Vectra sensor with Bosch number 0281 002 479 costs £130 inc VAT.

To confirm this I bought a secondhand Vectra MAF housing with sensor and it does indeed contain a sensor insert with part no. F00C 2G2 061. I swapped the insert with my tired old original and now I have loads more torque at low rpm, there's not much difference at high rpm.

So to summarise, if your Nissan MAF sensor has part no 22680-7F406 then a cheaper alternative is to buy Vauxhall part 93173727 and swap just the insert into the Nissan housing.
</td> </tr> <tr> <td class="alt2" style="border: 1px solid #D1D1E1; border-top: 0px">

</td> <td class="alt1" style="border: 1px solid #D1D1E1; border-left: 0px; border-top: 0px" align="right"> </td> </tr> </tbody></table>

 

[AlexD333]

found one I think

http://www.ebay.co.uk/itm/NEW-Air-f...livery-F00C2G2033-/251065458892#ht_5906wt_760

 

[Thomas-the-Terrano2]

hi, to bump this.

which wires/pins are used to read the maf voltage.

indeed what are they all for/coded.?

 

[Thomas-the-Terrano2]

also does battery need disconnecting to reset the ecu, feel read somewhere it
learns old maf characteristics?

 

[AlexD333]

I honestly cannot remember, Rick or Ray should be along to let us know though.

Have you inspected your maf? does the plate inside look filthy?

 

[Thomas-the-Terrano2]

not got it out yet, need a torx 5 bit. dont fancy hacksawing a grove in it.

do yo just clean the outside of the probe as folks taking cover off.