Patch how-to: manifold air temperature logging
Mar 24, 2010, 01:25 PM
#376
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Stupid question, but why pull the pin from the harness for fuel temp? Why not cut the existing wire and use that for input?
Where is the fuel temp sensor? Up front or out back? If it's in the engine bay, that would be ideal as you could just steal the wire from that location.
Where is the fuel temp sensor? Up front or out back? If it's in the engine bay, that would be ideal as you could just steal the wire from that location.
Apr 13, 2012, 08:38 PM
#383
i have installed the iat sensor patch. its evo 8 on pin 77. with blue-white wire..
and also patched my rom. when i log mat it always shows 195 f.
check that i have done.
tested my iat sensor at room, hot and cold temp and resistance is within the range.
key on. pin 77 a 4.7 v
and other is ground..
i have copied all my table . i don't see if i i am missing something..
if some one could help me out that would be great.
and also patched my rom. when i log mat it always shows 195 f.
check that i have done.
tested my iat sensor at room, hot and cold temp and resistance is within the range.
key on. pin 77 a 4.7 v
and other is ground..
i have copied all my table . i don't see if i i am missing something..
if some one could help me out that would be great.
Apr 14, 2012, 08:06 AM
#384
I have the Tephra mod done v7 and it already has the patch installed but the scaling is not correct. With evoscan I'm getting a reading of 195F. If I unplug the sensor it still reads the same. Maybe bad sensor? I have 96530706 loaded. I drove it in about 65F weather and the temp reading went down to 170F. Guessing scaling is off.
Last edited by wizzo 8; Apr 14, 2012 at 02:35 PM.
May 4, 2012, 10:37 PM
#385
I have the Tephra mod done v7 and it already has the patch installed but the scaling is not correct. With evoscan I'm getting a reading of 195F. If I unplug the sensor it still reads the same. Maybe bad sensor? I have 96530706 loaded. I drove it in about 65F weather and the temp reading went down to 170F. Guessing scaling is off.
EDIT: I soldered up another 2-pin pigtail so I could get a good test of the sensor. After driving the car around and it sitting in the garage for a couple hours the sensor read ~1.7Kohms. Tested the spare sensor I have in my parts box and it was 3K inside the house in free air (70F or so). Seems like the MAT sensor installed in the car is okay...humm...I will play more with it tomorrow. I can run the car and see how the resistance changes.
Am I going to have to swap to the SD v7 ROM, which is already patched for MAT? I was hoping to log load and MAT/MAP and build a starting point for my VE tables ahead of time.
Last edited by dingus; May 5, 2012 at 12:31 AM.
May 5, 2012, 08:35 AM
#386
Did you ever figure this out? I am having the same issue with the 88590715 Tephra V7 ROM. I wired up the sensor and am getting 4.73V (like mrFred talked about half way through this thread) at the signal wire going to the MAT but nomsense in the EvoScan log. Any ideas?
EDIT: I soldered up another 2-pin pigtail so I could get a good test of the sensor. After driving the car around and it sitting in the garage for a couple hours the sensor read ~1.7Kohms. Tested the spare sensor I have in my parts box and it was 3K inside the house in free air (70F or so). Seems like the MAT sensor installed in the car is okay...humm...I will play more with it tomorrow. I can run the car and see how the resistance changes.
Am I going to have to swap to the SD v7 ROM, which is already patched for MAT? I was hoping to log load and MAT/MAP and build a starting point for my VE tables ahead of time.
EDIT: I soldered up another 2-pin pigtail so I could get a good test of the sensor. After driving the car around and it sitting in the garage for a couple hours the sensor read ~1.7Kohms. Tested the spare sensor I have in my parts box and it was 3K inside the house in free air (70F or so). Seems like the MAT sensor installed in the car is okay...humm...I will play more with it tomorrow. I can run the car and see how the resistance changes.
Am I going to have to swap to the SD v7 ROM, which is already patched for MAT? I was hoping to log load and MAT/MAP and build a starting point for my VE tables ahead of time.
May 5, 2012, 09:10 AM
#387
Well I have isolated it to the v7 ROM.
I tested the sensor again after the car sat all night and the resistance I measure gives me the same temperature as what I am reading for the MAF temperature (86F from both).
I patched the last version of my stock ROM with the MAT patch and I can log it fine. But went I swapped back to my V7 ROM I get 195.5F. My guess is tephra moved some stuff around and this doesn't work for the 88590715 ROM or something... I guess I am going to start another thread and see if a guru somewhere can shed some light...
I tested the sensor again after the car sat all night and the resistance I measure gives me the same temperature as what I am reading for the MAF temperature (86F from both).
I patched the last version of my stock ROM with the MAT patch and I can log it fine. But went I swapped back to my V7 ROM I get 195.5F. My guess is tephra moved some stuff around and this doesn't work for the 88590715 ROM or something... I guess I am going to start another thread and see if a guru somewhere can shed some light...
May 5, 2012, 12:50 PM
#388
Well I have isolated it to the v7 ROM.
I tested the sensor again after the car sat all night and the resistance I measure gives me the same temperature as what I am reading for the MAF temperature (86F from both).
I patched the last version of my stock ROM with the MAT patch and I can log it fine. But went I swapped back to my V7 ROM I get 195.5F. My guess is tephra moved some stuff around and this doesn't work for the 88590715 ROM or something... I guess I am going to start another thread and see if a guru somewhere can shed some light...
I tested the sensor again after the car sat all night and the resistance I measure gives me the same temperature as what I am reading for the MAF temperature (86F from both).
I patched the last version of my stock ROM with the MAT patch and I can log it fine. But went I swapped back to my V7 ROM I get 195.5F. My guess is tephra moved some stuff around and this doesn't work for the 88590715 ROM or something... I guess I am going to start another thread and see if a guru somewhere can shed some light...
May 5, 2012, 01:10 PM
#389
I downloaded the 96530006 version just to look at the xml def structure and there are quite a few more tables than in the 88590015 version. I double checked that I had the MAT patch table setup right and it is. Looks like the 88590015 ROM only has one table unlike the 96530006.
What confuses me is that with my stock ROM loaded with the patch it seems to work fine...I guess that really isnt too confusing but I dont know where to go from here.
What confuses me is that with my stock ROM loaded with the patch it seems to work fine...I guess that really isnt too confusing but I dont know where to go from here.