Are Toyota Vacuum sensors actually different?

[abently]

Hi guys,

After some investigating, I get the funny feeling Toyota vacuum sensors are all the same, a bit the different mounting style which potentially affects the part number?

Looking through a few manuals, they all quoted the same voltage drop per XX decrease in vacuum, which has got me wondering, did Toyota purposely ID the vacuum sensors for different models with different Part numbers such that people who have to replace them, go and buy them from Toyota instead of getting one off a different Toyota at a wrecker?

I assume, the vacuum sensors have been re-engineered over time to be more precise and have longer lifetimes, but that's about it, it seems.

Of course you can't go and replace a 12V sensor with a 5V sensor, but from what I have read so far, the 5V sensors seem identical.

Anyone have the same or a differing opinion?

[thechuckster]

the NA ones are most likely the same except for packaging. All they need is a 5+ Ref and an ECU ground and they'll spit out a 0-5V for a 0-100kpa range.

The turbo sensors will vary in sensitivity range but wire up the same and will output a 0-5V across that range.

[oldcorollas]

packaging is also different to suit different models.

didn't Wilbo do some comparisons of NA vs turbo 2J MAP sensors? pressure vs voltage... thread somewhere.

edit: if you want generic, just go the motorola(?) MPX range

[madmont]

I have used a Camry MAP sensor on a Supra na motor and a Hiace motor without problems

[abently]

packaging is also different to suit different models.

didn't Wilbo do some comparisons of NA vs turbo 2J MAP sensors? pressure vs voltage... thread somewhere.

edit: if you want generic, just go the motorola(?) MPX range

Yeah, my guess is that the different part numbers only represent the different packaging/mounting style.

The N/A and Turbo sensors are definitely different though, in terms of what voltage it outputs relative to vacuum/pressure.

[abently]

I have used a Camry MAP sensor on a Supra na motor and a Hiace motor without problems

I thought so.

Cheers!

[abently]

Double post...

[jonathan yee]

some are the same others aren't. i know the gen2 3sgte MAPsensors are different to the gen3 3sgte MAP sensors.

tho the celica and mr2's have differnet part numbers and brackets they are the same sensor (of the same gen motor.)

[thechuckster]

some are the same others aren't. i know the gen2 3sgte MAPsensors are different to the gen3 3sgte MAP sensors.

they might be physically different, but both are probably 250kpa sensors.

[abently]

they might be physically different, but both are probably 250kpa sensors.

Actually, these ones are the exception to the rule I believe. One outputs 5V at a higher boost level than the other.

http://gtfour.supras.org.nz/mapsensor.htm

[thechuckster]

freaky - so the 205 unit is a 250kpa sensor and the 185 is a ? (can't find my guagePSI to KPA converter)

[jonathan yee]

they might be physically different, but both are probably 250kpa sensors.

no they give different readings for the same boost level. ie: if you fit a gen3 MAP sensor to your gen2 motor you'll raise the boost level to 18psi where as the stock gen2 MAP sensor will give you boost cut @ 12psi approx.

if you want to run the power FC designed for the gen3 motor you can't use the gen2 MAP sensor, you need the AP engineering version.

[MWP]

The gen2 sensor is just there for fuel cut and the dash boost gauge remember.
It was never used for any fuel/timing ECU calcs.

[Cuts]

its because the 205 map sensor is a 2.5 bar and the 185 one is 2 bar affik