gen3 PFC into a '91 gen2 how to

[mrlaw]

Hi all

I’m putting up a how to wire a Gen3 PFC in a ’91-92 USDM gen2
I get so many emails asking for this info info , makes me feel like a PFC guru (which I’m not).
You must double check the wiring using the BGB and the wiring diagram below


To make the gen3 PFC work in the gen2 (WITHOUT THE DATALOGIT) you must install these extra sensors:

• Gen3 mapsensor
• Gen3 Toyota Mass Air Temperature sensor
• Gen 2 Intake Air Temperature sensor( this is the black sensor under the engine decklid)

If you also have the Datalogit (a big plus) you need :
• Any map sensor you want (I’m using a $50 GM 3 bar) ,Apexi 3bar, gen2 ,gen3, AEM , You just need to change the scale and offset un the datalogit settings#3
• Gen3 Toyota Mass Air Temperature sensor
• Gen 2 Intake Air Temperature sensor( this is the black sensor under the engine decklid)

Here is how you wire the sensors in
The IAT you can splice into the AFM wires #5 & #7 ,or you can use new wires and connect them to THA &E2
The mat sensor you connect to THG & E 2

Then there are 14 wires you need to move around .
Most of them you can just open up the plug they are in insert a paperclipe ,pull the wire out and install it in the correct plug location

closed plug:


open the plug clip:

insert paperclipe from this side


Some pins are of a different size so they wont fit in the 'new' socket .In that case you cut the wire and solder it to the wire in the correct position

Here is how I refer the wires to:




> means :move to

A8->A12 (TPC)
B4->A8 (EGR)
A12->A9 (G2)
A13->A10 (NE)
A17->B17 (KNK)
B12->B9 (G1)
B5->A4 (RSO)
B10->B30 (FC)
B14->B10 (G-)
B17->A20 (PIM)
A25->B24 (ABS)
B29->B26 (CF)
B30->A25 (ATS)
A27->B14 (FPR)
MAT sensor to B20 (THG) and B21 (E2)
AIT to A19 (THA)
There are 4 left over wires from the Gen2 Loom:
STJ, VS, TVIS, THA1, THG

Lawrence

[Enthalpy]

Jeez, that's fantastic information! Thank you very much! Nice job!

[RickyB]

Actually, I would recommend leaving the THG pin in place and then connecting the MAT sensor to the two wires provided for the EGR temp sensor on California cars. On CA cars, you can unscrew the EGR temp sensor from the EGR pipe and leave it on a shelf or throw it away. On non-CA cars, the 2-pin connector still exists on the engine harness down near the distributor, but it has a jumper cap plugged into it to fool the ECU into not throwing a 71 CEL code. It may be covered and secured with electrical tape to keep it from flopping around. Just look down, find this connector, pull off the jumper cap and hook up the MAT sensor to the two wires there (one will be sensor ground and the other THG). There is no polarity on the MAT sensor, so either wire can go to either side of the sensor. This minimizes the number of wires you have to route past the firewall.

[Jylppy]

How about JDM 2gen Mr2 turbo re-wiring? I'm real rookie with all car electric but I really really want PFC for my darling.

[Jylppy]

I there any differences in rev1 and rev2 pinouts? Or something mechanical? I just try to understan these things and don't get it... That text about rev2->rev3 was awesome. Just need to know more about these things

[mrlaw]

hi,
what exactly don't you understand? Once you have ID your current ecu pinout you should just compare them to the gen3 pinouts above ,and make the appropriate changes.

Lawrence

[Jylppy]

Originally Posted by mrlaw

hi,
what exactly don't you understand? Once you have ID your current ecu pinout you should just compare them to the gen3 pinouts above ,and make the appropriate changes.

Lawrence

Yes that I understand but I meen differnces in rev1 and rev2 or are there any?

[luke willmot]

yes ther are meny differences betwen rev1 and rev2 depending on wether they are JMD or not