96Evo4.5 Posted March 22, 2021 Report Share Posted March 22, 2021 Hey guys, I have a 96 Lancer evolution, that im using my G4x on, I wired my Delphi IAT sensor into the MAF plug via AN Temp 2 as per the instruction manual. However I kept getting error codes saying "AN TEMP VOLT HIGH" so I took a look and it was sitting at 4.95-4.98 volts, So i upped the CEL trigger values to 5v, I dont get a CEL now anymore but the ecu is seeing -40 all the time, I thought maybe i ran the wires backwards so i swapped them and nothing changed still -40 still same voltage. Its making my start ups really tough, which they already are more difficult as the engine is brand new hasnt even seen 5 minutes of run time yet, its only run for about 2 minutes. EDIT: the actual temp in my garage is maybe 2 degrees some where around there, nothing even close to -40 Its a brand new IAT sensor as well just got it off amazon, has yet to actually get used. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 22, 2021 Report Share Posted March 22, 2021 That would suggest it is open circuit. To test you can short the pin 5 & 6 (ANT2 to gnd) together using a paper clip or similar, the voltage should then show zero and the temp should show 150. Quote Link to comment Share on other sites More sharing options...
96Evo4.5 Posted March 22, 2021 Author Report Share Posted March 22, 2021 Hey Adam, I tried touching the wires together, what should be AN Temp 2, to the ground on the MAF harness, and nothing changed. The voltages and readings all stayed the same, I can try running the ANT2 to a chassis ground, and see if that makes a difference. Alright so the harness diagram for the 8 in the manual is different then on the 4. instead of ANT2 being pin 6, its pin 2 on the MAF plug, when i grounded pin 2 the ANT2 voltage went from 4.99 to 2.89 volts. im assuming there is still something going on? as you said it should read 0. Thoughts? When I grounded Pin 6, nothing happened. I suppose i could be looking at the MAF plug incorrectly, I was just going off the image in the manual. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 22, 2021 Report Share Posted March 22, 2021 The image in the manual is looking into the connector on the MAF housing. It should be 5 &6, as far as I can see even evo 1-3 used the same pinout. I only have a Evo 7 manual handy, but tt looks like ground wire should be black and the AN T2 wire is red and blue. Quote Link to comment Share on other sites More sharing options...
96Evo4.5 Posted March 22, 2021 Author Report Share Posted March 22, 2021 I must of been looking at it incorrectly, cause the AN T it is Red with a blue stripe, Ground is Black, after testing to be sure. are those Voltages okay then? or is there something off with them? you had mentioned that if grounded it should read 0. It only went down to 2.89 volts. I just grounded it to the strut bolts i didnt ground it to the MAF ground however. I wouldnt of thought that would make a difference however. Want to thank you again for your help. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 22, 2021 Report Share Posted March 22, 2021 It should go to very near 0v when shorted to ground. 2.89v suggests you have a bad connection. Try the paper clip trick I originally suggested. Quote Link to comment Share on other sites More sharing options...
96Evo4.5 Posted March 23, 2021 Author Report Share Posted March 23, 2021 I will try that paper clip trick you suggested. see if that changes the out come of the test. On a completely unrelated topic while i have you here, do you know where i can find Fuel Injector Clinc 1450cc latency times @ X voltages? I input the latency times from the 1650cc set as those were the only ones i could find. Im hoping they are close enough to at least keep the car running without making it super rich. Quote Link to comment Share on other sites More sharing options...
96Evo4.5 Posted March 23, 2021 Author Report Share Posted March 23, 2021 It is still reading fairly high voltage even when paperclipped to ground, however the IAT no longer reads -40 it now reads 12 degrees, which is what my coolant temp sensor is also reading, so im assuming that as long as they both read similarly when cold that the iat must be reading correctly. or very close to. Quote Link to comment Share on other sites More sharing options...
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