[Mk2] [Turbo] AP Engineering Power FC Issues

[gtfour-wrc]

Jim,

Can you recall if your Rev2 had EGR?

Thanks,

[jimGTS]

NO jdm mr2 turbos had EGRs

[gtfour-wrc]

So why would their 89661-17380 Rev2 ECU have a pinout for EGR and an EGR Temp Sensor then?

Could it be they used the same ECU as the the UK/US but with a different engine harness that did not have a wire for the EGR?

Thanks,

[dex]

Circuit boards can be marked with things like THG even though the ecu does not support it. This is because the hardware is same regardless of the programming. So, as per my earlier post, the THG input gets used for THE in the JDM rev1/2 turbos.

[gtfour-wrc]

OK, we are getting somewhere or NOT

Dex, this AC Evap Temp sensor, where is it located since this is what you said it is?

These are the Pinouts for a JDM 89661-17380 ECU for those that are interested.

[dex]

It connects to the 15 pin plug of the chassis loom and I guess that it runs up to the aircon unit behind the dashboard.

[gtfour-wrc]

So that would be THG by looking at my image in the last post?

Now why would this sensor be used on a power fc for tuning and monitoring.
Any ideas?

[dex]

Yes, pin 10 of 16.

Your GT4 doesn't have EGR does it?

[gtfour-wrc]

It has EGR not the EGR Sensor.

10 of 16?

Reading it like this?
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16

or like this
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9



thanks

[dex]

So it has an EGR VSV but not a EGR temperature sensor then?

Pin 1 - VC
Pin 8 - VF
Pin 9 - E2
Pin 16 - IDL2

[gtfour-wrc]

OK got it

Here's a pic of the Rev2 pinout. The ones in blue have the correct sensors going to them



Dex, do you see any left out that may cause problems, besides THG/CCO

[dex]

It pretty much as my rev2 turbo except for the following was connected on mine;

EVP - canister purge solenoid
VTA2 - traction control TPS (tied to VC)
THG - as discussed, used for THE
TE2 - test connector
IDL2 - traction control TPS (tied to gnd)
PS - power steering
PSCT - power steering
ABS - ABS ecu (no idea why as this is not present)
CCO - catalytic converter temp sensor
ECO - a/c economy mode switch

I think that the TE2 should be connected and THG tied to gnd. The rest probably do not matter for your GT4 as I found some old notes which did not show them being connected for the Celica.

[gtfour-wrc]

Thanks Dex.
I'll wire up the THG to an AIT sensor and leave CCO alone.

[dex]

Are you doing the conversion to do away with the VAF? If not then I do not think wiring up THG to an air temp sensor will help. If you are doing the conversion then a different pin gets used.

[gtfour-wrc]

dex,

The AIMT sensor on my controller is controlled by the THA & E2 pinouts within the AFM and the Apexi instructions advise to use these for the MAT sensor. So this being correct what other wiring would you use it on?

[dex]

I would not expect you to have a manifold air temperature sensor unless you are doing the conversion to speed density. Are you doing the conversion?

[gtfour-wrc]

It will be converted to a speed density system.

[dex]

Ah, in that case I'm you may need to use THG for the THAM signal but you may need to swap some other pins around too. It all depends on how Apexi designed the ecu.