FIC Installation Notes: Toyota / Scion

[JR]

2005-2006 Scion tC:

FIC Part number:   30-1910
FIC Slave Firmware: z104.hex
Cam Sensor: Magnetic (2-wire)
Crank Sensor: Magnetic (2-wire)
Engine Load: MAF Sensor
ECU Location: Cabin, passenger side behind glovebox


FIC O2 Table notes:
Boosted Scion tC owners who want to enrichen the fueling at partial throttle settings when the factory ECU is in feedback mode can do so with the F/IC. The Factory ECU tries to run the engine at stoich (~14.7:1 Air/Fuel) when it is not at full throttle. However, forced induction tC's can make boost while still at partial throttle and the ECU is still in feedback mode. 14.7 is TOO LEAN to be running when under any appreciable boost and can cause stumbles.

The Scion tC has a uncommon O2 sensor style but the F/IC can still modify your target AFR's. It is assumed that you have the F/IC hooked up per the recommended connection diagram from AEM. It is also assumed that you have an independent AFR device to confirm the proper operation. It doesnt have to stay on the car but it is valuable during setup to confirm proper operation.

Step 1:
Open the Setup dialog box
In the O2 sensor section (top right)
Load Input = MAP (Sets the Y axis of the O2 map to the internal MAP sensor)
Mode = Voltage (says the table will contain raw voltages)
Period = Not applicable for Voltage mode
Bank1 Hi voltage = 4.95
Bank1 Lo voltage = 0.0

Now open the O2 Map by either clicking on the icon with the big "O" in it or select "O2 Map" under the maps menu.

The O2 Map is a 21 RPM (X Axis) by 17 Boost (Y Axis) table. In each cell is the voltage you want for each operating point (The F/IC interpolates between the 4 nearest breakpoints for smooth transitions).

Set up the load axis by clicking on each breakpoint and setting it to whatever you want. You can also drag a bunch of them and it will interpolate between the end points. Do the same with the RPM. These two sets of breakpoints are unique to this table so changing them wont change them in other tables.

Enter the desired closed loop AFR target into the cells of the table using the following values.

AFR   Value
17.4    4.0
17.0    3.9
16.6    3.8
16.2    3.7
15.8    3.6
15.5    3.5
15.2    3.4
14.9    3.3
14.7    3.2
14.4    3.1
14.2    3.0
14.0    2.9
13.8    2.8
13.6    2.7
13.5    2.6
13.3    2.5
13.2    2.4
13.1    2.3
13.0    2.2
12.9    2.1
12.8    2.0
12.7    1.9
12.6    1.8
12.5    1.7
12.4    1.5
12.3    1.4
12.2    1.3
12.1    1.2
12.0    1.1
11.9    1.0

So if you want 13:1 AFR in a particular point, put 2.2 in that point in the table. Some minor tweaking may be required but these values will get you VERY close. As long as the factory ECU is in feedback then these values will be used.

IMPORTANT:
If you just change the target AFR, the factory ECU will adjust the trims to achieve the desired AFR. BUT, if you make huge changes then you will get huge trim corrections and the chance of a check engine code for excessive trims. Dont forget to adjust the fuel maps to add the approximate amount you are requesting here. That way the trims will stay near zero!



FIC MAF table notes:
I went out with out with our N/A 2005 tC and got the data to set up a RPM dependent MAF clamp. I logged the MAF sensor voltage over multiple WOT runs. We are at sea level so I took all the data, plotted it and added a 5% safety margin then clamped it in the table.

Set up the MAF spoofing function breakpoints and table just as shown here. Also make sure you change the MAF setup in the SETUP dialog box.

Using this setup will clamp your MAF signal at the typical N/A signal level based on the engine RPM. That way whenever you are in boost the factory ECU WILL NOT be providing any fuel. All the fuel must be added by the FIC which makes it tons easier to set up your fuel maps.




Wiring diagram attached below:

[JR]

2003-2005 Toyota Celica GT-S.

FIC Part number:   30-1910
FIC Slave Firmware: z104.hex
Cam Sensor: Magnetic (2-wire)
Crank Sensor: Magnetic (2-wire)
Engine Load: MAF Sensor
ECU Location: Engine Bay


FIC O2 Table notes:
OEM sensor acts like narrowband type:
use O2 table in Offset mode, subtract voltage to run richer AFRs during closed-loop operation


Wiring diagram attached below:

[JR]

Scion xB 2004-2005, Scion xA 2004-2005, Toyota Corolla 2003-2004 and the Toyota Matrix 2003-2004.


FIC Part number:   30-1910
FIC Slave Firmware: z104.hex
Cam Sensor: Magnetic (2-wire)
Crank Sensor: Magnetic (2-wire)
Engine Load: MAF Sensor
ECU Location: Cabin, passenger side behind glovebox




Wiring diagram attached below:

EDIT: June 18, 2007: Corrected year coverage on xB

[JR]

The TC I tuned will be back in the shop for some more fine tuning. It seems after a few drive cycles it will unexplainably go full rich and stumble.
I took extra care to make sure all the fuel trims were as close to 0 as possible on the dyno but maybe he found some sections of the tune on the street
that I didnt catch. Im still a tad confused as to where to clamp the MAF voltage and start the MAP sensor fueling, and if I should use the MAF tables or the MAp tables or both for acheiving the best AFRs and consistant results. Even on the dyno the AFRs would someitmes go full rich on the top end without no warning and no changes, then the next pull would be right back to normal agian.

Both the MAF and MAP tables are live and the data entered into them is multiplicative. So for a given spot, putting +10% in the MAF table and +20 in the MAP table will give (Base * 1.10 * 1.20) = Base * 1.32) or a 32% increase.

The MAF clamp should reflect the highest voltage output the vehicle can attain without going into boost, plus a small fudge factor (say 5% more).

You have to make sure that the Fuel map and the O2 spoof table are trying to accomplish the same things. Make sure that if you are having the O2 system f/b to 20% richer that in the exact same locations you are adding 20% fuel as well. Not doing this will cause the fuel trims to start going nuts.

IMO, I would simply not use the MAF based FUEL table. I would set the clamp and leave it filled with zeros (zeros means do nothing). Use the boost pressure fuel map to do all your tuning. Otherwise it's too easy to get confused.

In fact, I would go even 1 step further. I would not use the "single value" MAF MAX Voltage  clamp on the setup screen. I would use the MAF table (the "M" icon) to set the clamp for each RPM. That way the ECU will not get abnormally high values at low RPM just because you have to set the clamp high enough to get a good reading at high RPM.

[whitedragon]

Hi!

I have a 2006 Toyota Corolla XRS and i have followed the posted wiring instructions for a 03 - 05 Celica GT-S as it has the same engine.

The problem that i am having is, when i start the car it idles fine, but the moment i rev over 2000 rpm the car starts to hesitate?

It doesn't rev above 3000 rpm?

Please help me figure out what the problem is?

[JR]

just because it has the same engine does not necessarily mean the ECU wiring is identical. Do you know if the ECU's will interchange between the two models?

[DG]

The ECU for the 2006 Toyota Corolla XRS has different pin-outs than the 03-05 Celica GT-S.  The Cam Sensor, O2 Sensor, MAF, and some grounds are different between these two.

[xa007]

The diagram indicates that CRK MAGO- and CAM1 MAGO- is not connected. Check the instructions that comes with the F/IC. They need to be connected to the common along with CRK MAGI- and CAM1 MAGI-.

[vitz rs turbo]

Hi guys I drive a vitz also known as yaris and echo and its factory turboed by TRD from japan and its fitted with a TRD ecu. Its a high compression 1NZFE engine with 0.3bar boost mapped for 100ron. CAN I FIT A FIC ON THIS ECU? Hoping to retard timing as in my country we run with 95ron and increase fuelling and increase boost to 0.8bar. can I put the FIC on any ECU  ?

[SB]

vitz rs turbo,

We are working on a PnP application for the USDM Yaris/xD, but have not wired the FIC to a test car yet. The FIC was designed to work with nearly any ECU (except those using frequency-based MAF sensors), so there shouldn't be any problems as long as it is wired correctly. Take control of one circuit at a time (crank, cam, MAP/MAF sensor, O2, injectors...) and test each circuit before you wire the next circuit into the FIC.

[vitz rs turbo]

 thank you for your reply,

so if I understand well, there is no PnP kit now, so how shoul I do to install the FIC to the ECU as I am a DIYer.

Please Help me go through the installation 
 

[SB]

If you want to install the FIC without using a PnP harness, you will need to get a factory ECU pinout diagram and find which wires are used for the injector, MAF, MAP, crank sensor, cam sensor, O2 sensor, and TPS sensors. Then you will need to cut some of them and tap others into the flying lead harness that is supplied with the FIC. This is not a simple or easy project for most people, if you haven't done something like this before I wouldn't recommend using your expensive new car as a learning platform. You might be better off taking the car to a shop with wiring experience, or waiting for our PnP harness to be released.

[Damborg]

Why the o2 sensor resistor at 10k .? This will make the Original ECU seeing leanMixture.?

[00ITR #543]

I am helping a friend out with a 06 Scion TC.  He has a turbokit with 550 cc injectors, boomslang harness and the FIC.  I can get the car to idle like stock and start up fine.  I also tuned the vacuum portion of the fuel map/map load, so the car is drivable and drives perfectly under vacuum..  What I noticed and didn't want to take it any further into the boost portions of the map is that all the numbers are positive, even in idle..  The numbers look very high, seeing he is going from 370cc injectors to 550cc injectors.  I verified that he is using the correct injectors made specifically for his application (correct impedance) and everything else looks good.  It was alarming that the idle and vacuum portion of the map are very high, especially seeing that the adjustability only goes to 99.2.  Duty cycles look normal on the injectors, but I would probably run out of adjustability at about 5 psig of boost (calculation based on map).  I have the fuel map/maf load tables zeroed out as recommended by aem.  I know that I can probably get more fuel in by using that table, but it doesn't seem right to do that, especially based on calculations I should be somewhere around -67 in idle  370cc/550cc= .67..  Attached is a copy of the map I was working off of.  It was converted base map from another scion from ver 2 to the latest 3.01.

Any suggestions are welcome..

[phresh47]

does anyone have any info on this? ^^^^ we are trying to get my car tuned and this is the problem im having