California FJ62 3FE ECU - Found One Thanks

[73tlcv8]

I've been doing some research on the 3FE ECU the last couple of years as time permits. I pulled the code with the help of the Supra guys and ran it through a disassembler, working on sorting it out. I really could use a picture of a California ECU internals (like below) if anyone has one they could take a picture of. Thanks.

This is a non California ECU:

 

[OSS]

Holy Cow!
As far as I know, there's only one version of USA FJ62. No vehicle manufacturer that sells cars in the USA makes a Calif specific engine. A "California Compliant" badge only means that the engine will pass California regulations. All vehicles sold in the USA are Calif compliant.

 

[73tlcv8]

Based on what I could find there was a different part number for the California ECU. The California ECU had at least an additional input for EGR temperature. Thanks.

 

[LAMBCRUSHER]

That is what I understand as well...I have an extra ecu. Let me see which one it is.

 

[Prairie Swamp]

Holy Cow!
As far as I know, there's only one version of USA FJ62. No vehicle manufacturer that sells cars in the USA makes a Calif specific engine. A "California Compliant" badge only means that the engine will pass California regulations. All vehicles sold in the USA are Calif compliant.

California emission regulations pre-date Federal EPA regulations for vehicle emissions so they have the right to set standards that are more strict than what are known as "49 state" emissions. Some states (New York, New Jersey, Mass?) have voluntarily adopted the Cali standards.

So for decades auto manufacturers have had to offer two emissions systems. The engines may be largely the same, but the emissions equipment is definitely different. This also means that the ECU is specific to California emissions simply because the hardware and standards to be met are different.

And hats off to the OP - I've never seen ECU code posted on a forum.

 

[OSS]

Thanks for that - was unaware.
Seems odd though.

 

[Dynosoar]

My 3FE computer looks very different inside.

 

[73tlcv8]

There are some differences between the gray and yellow plug boxes. I picked the -8860 micro processor since it potentially had more configurable parameters than the yellow boxes. There are SIN0-SIN3 signals and other ports that can be used to change how the code runs by installing or removing resistors - that could tell it if it is a JDM or US application, AT or MT, EGR or not, that sort of thing. Or maybe nothing - I'm between houses so am bored right now.

 

[sbelinge]

Just curious, why are you doing this?

 

[LAMBCRUSHER]

why hasn't it already been done?

 

[Prairie Swamp]

On a side note - I like how these are all discrete components. Very repairable compared to surface mount devices. If you fry an output I'm sure it could be repaired. If the brain box is toast that's another story.

 

[73tlcv8]

I was digging around on ebay and found what I needed, thanks.

 

[73tlcv8]

Just curious, why are you doing this?

It appears a gray plug non California ECU will work as a California ECU by simply adding a 100 ohm resistor in R506. They appear to have the same circuit boards and they share the same processor. The California ECU has the extra resistor in R506 which is a data bit read by the code (Port B bit 4, pin 23).

If someone was in a bind to get a california ECU they could try this before spending the big bucks.

 

[LAMBCRUSHER]

Would removing said resistor from cal-ecu prevent the egr code 71 from ever appearing?

 

[73tlcv8]

I don't have any information about the EGR gas sensor or what makes it throw code 71. If the theory holds then removing the resistor (or plugging in a non California gray plug ecu) should make it ignore the EGR gas sensor. I am not advocating this of course.

Can you tell me what terminal the egr gas sensor comes into the ECU on and what causes it to throw the code, My FSM does not contain that information. thanks

 

[73tlcv8]

The code definitely tests weather r506 or r507 are installed and performs different steps accordingly. Don't know what these steps do yet. btw from what I learned from the Supra guys, the 7433-1139, specifically the -1139 on the processor chip is the software ID.

Does anyone have a 89 or 90 schematic they could share? thanks

 

[Kleatus]

As far as I can tell the only thing the EGR sensor does is signal code 71 and illuminate the MIL when the ECU looks for EGR operation via increase in temp at EGR body. (It’s threaded into the back of the EGR valve housing). It’s not listed on the “input signals” on the first pic. If it does tie in to anything else I’d be interested to know what/how. I can tell you that a 10k ohm 0.25w resistor in lieu of the sensor will keep the light off..
Second pic is pin location at ECU (#13).

 

[73tlcv8]

The ECU probably just tests to see if the sensor is live. The 10k resistor may perform that function but it also may interfere with other operations if it is not a true indication. Is that a FJ62 schematic? I've seen it before and it does not quite match my wiring so I figured it may be for an 80 series 3-FE. The 88 schematic shows the connection and the FSM has a spare connection in that location (the spare terminal above the E11 if I recall). The 88 schematic also shows the jumper for non California applications. I was wanting to see a 89 or 90 schematic that would go with the gray plug ECU to see what it showed for the EGR Gas Sensor (THG Signal).


View attachment 1603069 View attachment 1603070

 

[73tlcv8]

The ECU probably just tests to see if the sensor is live. The 10k resistor may perform that function but it also may interfere with other operations if it is not a true indication. Is that a FJ62 schematic? I've seen it before and it does not quite match my wiring so I figured it may be for an 80 series 3-FE. The 88 schematic shows the connection and the FSM has a spare connection in that location (the spare terminal above the E11). The 88 schematic also shows the jumper for non California applications. I was wanting to see a 89 or 90 schematic that would go with the gray plug ECU to see what it showed for the EGR Gas Sensor (THG Signal).

 

[LAMBCRUSHER]

so when do you break out the turbo?