LP, MP, HP aircon pressure switch

[CrUZida]

Does anyone have any info regarding this switch?
I thought it was MA70, but it doesn't match anything in the online TSRM.

I want to hook it up as an aircon overpressure switch (to turn the thermo's on).

The top and bottom pins were continuous when there was no pressure in the system.
The left and right pins became continuous when the system was gassed (but the pressure was well below over-pressure settings).

Any help would be good

[matty12]

what are the ratings on it
HP
MP
LP

Male or female thread?

No part number on it?

AFAIK LP will be you low pressure to drop the system out when charge is low

MP will be your fan switch
HP will also drop out is system pressure is too high.

[CrUZida]

Can't remember the ratings atm, and not home for a couple of weeks unfortunately.

Male thread (ie, screws into the pipe - like an oil pressure switch)

Only a NipponDenso part number (I think - definitely not Toyota number).


I agree with your thoughts there. Hoping someone has a pinout or similar.

[JZA70R_92]

Looks like the one on my 1JZ ive got a MA70 one and the wires come out and go to a male plug. 1JZ one has the plug going right on it no wires tailing off!

[CrUZida]

Random, maybe its an Aus/JDM thing then, as the US TSRM only had 2 x 2pin switches.

[oldcorollas]

fwiw, the Century manual i have shows a single switch..
the Dina manual shows a single pressure switch too, but within it are two switches in series.... (look to be NC)

that probably doesn't help tho
unless... it is 2 NC and 1 NO switches...
NO closes with some pressure, then on eof the NC switches opens if pressure is too high?