OK,

The Pro-M universal pigtail 6 wire connector has the following wires:

A Power
B Ground
C Ground
D MAF Signal Voltage
E IAT Voltage
F IAT Ground

My question is what are the stock connector wires designated as?
I know the black with grey stripe is ground on the stock one, but I am clueless about all the other wires...

Anyone?

 

Here is another JPEG file showing the rest of the MAF wires and their origins (Click on the image when the dropbox webpage open to get a sharper view):

https://www.dropbox.com/s/05h915z6yj...Diagram%20.jpg

Looks like the white wire is coming from the fusebox.

Jim Lombardi

 

I am illiterate when it comes to reading these things, so please confirm:

On the stock connector:

MAF signal green (Middle) wire on the stock
MAF ground Black with green stripe
IAT voltage orange wire
Ground black with grey stripe

So what does the white with green stripe do?? Is this the power to the sensor? that seems to be the only one left, right ??

 

I am not an auto tech or a professional electronics person, and I can only try to state what it looks like from the Jaguar Electrical Guide information:

Since the White/Blue stripe wire comes from the Engine Compartment fusebox, it probably provides the power to the MAF.

I also think that your list of the other wires on the connector is correct.

I updated the JPEG that is in my last posting to include your photo and list all the wires in the MAF connector.

Jim Lombardi

 

A huge thank you for all your help.

I ought to have this on the car by this weekend I'll post again when I do.

 

Wired in the connector and got a p0112 bad IAT circuit...
Put the stock MAF with the stock connector, all works fine with no codes.

I'll try to get a hold of someone at Pro-M monday to sort out the wiring.

The car did start and seemed to run fine with the 92mm, but I thought it best to wait and get it right before pushing it.

 

Don't know if the ProM-92 version even has an IAT sensor, and if it would have, I am sure it will not be the same as the Jaguar one.

Either reuse the old thermistor in the MAF, or use a thermistor from the IAT#2 or normal coolant sensor, as they are exactly the same as the one in the MAF. Just hang the thermistor close to the airfilter and your done.

 

Wow, thank you !
I'll do that as soon as I get the parts, and will mount it next to the air cleaner as you say.

 

I have ordered a normal coolant sensor from my local dealer for $20, since the "IAT" sensor was $120, and an uber-helpful board member has offered to mail me the connector , so as soon as that arrives, I am in business. At that point I am going to go get my "after" dyno and will post the results.

 

Tried the coolant sensor but it did not work correctly. It is reading -5 degrees when it is +90. Same reading with the wires both ways.

So maybe the true IAT sensor uses a different voltage?

 

I've only checked the resistance values, which come very close. What resistance do you measure on the sensor with +90?

 

If it's only two wires from the sensor, it could be;

Thermocouple, gives a µV to mV output, varying resistances
Thermistor, either NTC, or PTC, as I recall usually something around 3KΩ
RTD, could be 100Ω, 1000Ω, or something different again

What are the actual resistances that you get from the sensors at different temperatures? Also try measuring DC voltage from the sensor at different temperatures too...

 

Its a NTC, and here are the resistance values to be expected:

The IAT2 sensor is about the same as the original MAF IAT sensor in terms resistance you can measure. The ECT one is only slightly different, but should still be close enough.

0C= 5.74 Kohm orig IAT, and 5.90 Kohm ECT
20C= 2.75 Kohm orig IAT, and 2.5Kohm ECT
40C=1.18 Kohm orig IAT, and 1.15Kohm ECT

 

Question: Where is the IAT2 sensor located? I will need to show the parts guy at my local jag dealer where the part is on a diagram so I can order one.

 

Can you let me know what the resistance is you measure now?

I can only do some checks this weekend on my car, as I also would like to know why it doesn't workout, as I would have thought the ECT one would work as well.

The IAT#2 sensor sits on the back of your lh bank intercooler. Before you order one, just take it off and connect it to check if you get the right temp there.

 

Soooo, on my multi meter, I set at 2000K ohms it reads 32 for the coolant sensor and 2 for the IAT#2 both at the same temp approx 65 F

It seems if I disconnect the connector to the IAT#2 I get "restricted performance." so I am not able to swap positions.

I tried to disconnect the connector to the IAT #2 and wired it to the MAF connector, still got restricted performance. Is this always the case when the connector to IAT#2 is disconnected?

 

Of course you get a restricted performance, its only to check that you get the right temperature value when you connected it to the original place, so you know it works before you buy a new one.

What temperature reading did you get with the IAT#2 connected?

Don't understand the readings you mention, at 65f so almost 20c it should have been close to 2.75 Kohm, or 2750 Ohm. can you check again how to read your multimeter?

 

I set my multimeter on the 2000 setting for ohms and it was reading 890 at 103 F. I left the sensor in place, used long wires from the iat wires from the maf connector, and the charge cooler was still warm from a recent drive, so I think the 103 F is reasonably accurate?

 

is the iat#2 much a cheaper sensor? It would appear I could use this sensor accrately.

 

I just ordered the original MAF IAT sensor from Gaudin in Nevada for $75
The R&D time wasn't worth trying to save $50

I'll post again when it arrives and is installed