Never knew this existed or is this just on a series 4 zed ?

 

Found it hidden under the front right of the air filter nose panel.

 

Its a stock part but don't remember seeing it on my other zeds.

 

I've got all my front end off, if i remember i'll have another look but pretty sure i've not seen this on my S4, wonder if i've the plug dangling.

IIRC it's because your car is OBD11, this is a map sensor.

Here's another pic to give you an idea of where to look for it.

 

Its attached to the same loom as the maf but further up.

 

 

My '95 S4 has it, but it's not a MAP sensor (on 96+ are obd2). I came to the conclusion it's a boost sensor for the later ecu.

I stand semi corrected, it's both a MAP and Boost sensor

 

Courtesy Nissan has it down as EVAP pressure sensor. If it is a MAP sensor, I can't find the pressure specs on it

Ok your kind of all correct, it works similar to a map sensor as it has both electrical and a vacuum connection, however as there is still an air flow meter been used its not strictly been used as a map sensor.

 

The later 16 bit ecu has a larger map logging capability and the extra signal is been used to directly compare the air flow meter reading and the absolute manifold pressure. Having the extra processing power the 16 bit ecu can use the extra signals primarily for economy and emission correction.

 

The sensor is a generic unit common to many Nissan cars including the 200sx and Skyline, as far as the 300zx is concerned it was to comply with ever increasing emissions regulations when new and very likely the US market sales domination.

 

Jeff

Edited January 3, 20178 yr by JeffTT

I have the plug Lee, i must of looked at it not long ago as well because i tidied this area and added some support brackets, never thought much about it though.