Nissan 370Z Forum - View Single Post - Intake Air Temp reading 6°F too high. Is this a problem?

1slow370 · 04-01-2014, 02:12 AM

the only way to recalibrate engine sensors like this is through an ecu reflash, consult is a repair tool and as such is not designed to things like this, a factory calibration for the factory sensors is flashed into the ecu and the repair procedures are if there is a problem replace it. unfortunately non of the aftermarket reflash tools have cracked the ecu's architecture far enough that they can locate and perform recalibration for sensors and instead just leave that entire block of code the way it is from nissan. not just the iat sensors even things like changing from an oil pressure switch to an oil pressure sensor are not possible with the current software.as it is the only way the engine knows if it has low but not nonexistant oil pressure is if the cam timing gets affected from the solenoids not having enough pressure to accurately work. Current software only allows for the overwriting of the MAF flow correction table, so you have two sensors you can recalibrate (but not the iat because it is a seperate sensor even though it is part of the maf).

Also per the fsm the ecu only uses IAT sensor bank one for all of its calculations bank 2 sensor has a dtc but is completely ignored. also looking at the sensor graph it is much less sensitive as temperature rises. At lower temps around 30F a 1kohm difference is about 10 degrees but at 140F 0.1kohms is almost 40degrees. the tolerance of the ecu's settings combined with the inaccuracy of the factory iat sensor makes you wonder how they expected to get any kind of an accurate reading at all so if it's only 6 degrees off you should be happy lol

Edit:also dealerships charge 100 dollars to just think about working on your car. Fontana wanted to charge me $118 to take 5 minutes and do the NATS reset on my car after I swapped the ecu. The procedure is literally key car to on, put fob in slot, connect consult3, click repair, click immu, click nats innitialization, click start, wait, switch keys, click continue, wait, shut car off and restart. <-$118 F****N dollars

04-01-2014, 02:12 AM	#30 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	the only way to recalibrate engine sensors like this is through an ecu reflash, consult is a repair tool and as such is not designed to things like this, a factory calibration for the factory sensors is flashed into the ecu and the repair procedures are if there is a problem replace it. unfortunately non of the aftermarket reflash tools have cracked the ecu's architecture far enough that they can locate and perform recalibration for sensors and instead just leave that entire block of code the way it is from nissan. not just the iat sensors even things like changing from an oil pressure switch to an oil pressure sensor are not possible with the current software.as it is the only way the engine knows if it has low but not nonexistant oil pressure is if the cam timing gets affected from the solenoids not having enough pressure to accurately work. Current software only allows for the overwriting of the MAF flow correction table, so you have two sensors you can recalibrate (but not the iat because it is a seperate sensor even though it is part of the maf). Also per the fsm the ecu only uses IAT sensor bank one for all of its calculations bank 2 sensor has a dtc but is completely ignored. also looking at the sensor graph it is much less sensitive as temperature rises. At lower temps around 30F a 1kohm difference is about 10 degrees but at 140F 0.1kohms is almost 40degrees. the tolerance of the ecu's settings combined with the inaccuracy of the factory iat sensor makes you wonder how they expected to get any kind of an accurate reading at all so if it's only 6 degrees off you should be happy lol Edit:also dealerships charge 100 dollars to just think about working on your car. Fontana wanted to charge me $118 to take 5 minutes and do the NATS reset on my car after I swapped the ecu. The procedure is literally key car to on, put fob in slot, connect consult3, click repair, click immu, click nats innitialization, click start, wait, switch keys, click continue, wait, shut car off and restart. <-$118 F**N dollars __________________ ANSWER PRICE LIST** Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50 Last edited by 1slow370; 04-01-2014 at 02:28 AM.