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Yeah, that looks very similar, even has the same FLASH ROM if I am making out the numbers right. I've solved the code 53 error I was getting. Now working on the intermittent miss which seems related to noise.

IAT is in the AFM. The thing in the bumper is the outside ambient temp sensor for the automatic A/C.

http://www.engine-light-help.com/voltage-drop.html

Slide razor blade between the two pieces. It hasn't been opened for 20+ years. Also, getting that o-ring to stay in the groove on assembly is a chore. I used a thin card to push it back into the groove as I brought the two pieces together.... and don't overfill or it will be locked up tight...

I have several ECUs currently with different levels of modification to them that I swap around routinely. The stock ECU, (p/n 89661-14271 1990 A/T), idles perfectly. When I swap in an 89661-14270 (1989 A/T) I get the miss shown in the two videos. Depending on what I do to the guts of the ECU...

Here and here.... http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=BE&P=42 http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=BE&P=43 I must say the OP's spelling is eclectic.

Mass air flow = instrument that measure mass/time (kg/s) through the sensor. Hot wire is the most common practical way of doing this. This is what you want to know in order to compute the engines volumetric efficiency and thus how much fuel to inject. An air flow meter measures air velocity in...

The EGR source is from the #6 exhaust port, but that is irrelevant. The gas is routed to all intake ports via the surge tank. The reason your intake is black is from the PCV not EGR. JDUB is the guy who measured the reduction in EGTs. The post is on this site. And let's kill the myth that...

If you want to see why Chinese goods are stocked in Walmart, you need only look in the mirror. When you chose that $6 laundry basket instead of the $12 one, because they were identical in quality, you made a decision that affected the entire world economy. Walt's kids had nothing to with it...

The circuit-opening-relay and wiring would certainly be a good place to look. I am confused though, how do you expect to solve this problem without getting out a voltmeter and start to measure things?

"In formula 1, ABS was banned in 1993 after being used most successfully, along with many other driving aids, like traction control, launch control, active suspension and so on, in the 1992 and 1993 seasons. It was classified as an electronic driver aid, preventing the wheels from locking up and...

There are few people willing to fool around with a new under-warranty car. Those that do have big budgets. The rest need to wait until the engine is worth chump-change, about 10 years!

SMRC/SIR bits 0-3 set the baud rate of the serial CLK signal. When read, they give the logic level of the SINx signals. Often used to read configuration data set by resistors on the ECU board. Also some parity functions. TAIT bits 0-3 control the timer clock rate. Bits 4/5 control whether ASRx...

Some photos of the new board installed in the ECU.

I'm taking notes! :icon_bigg

Well, I had the modified ECU running in the car this evening. The good news is it runs, and new board fits nicely in the original case. The bad news is there's an intermittent miss and code 53 ("knock control program faulty"). Code 53 is a weird one, like 51 it does not get retained. Likely...

The problem with DI is that you can only inject on the intake stroke, and that places strict limits on the amount of fuel you can stuff for max power with a given setup. Also, the shorter cycle time at high rpm results in stratification issues when a lot of fuel is dumped in in a very short...

Low compression can do that!

Yes, exactly. I wasn't very clear above, but what I meant by MIL light off is that no codes are stored. The MIL light is on no matter what when starting. You have to turn the ignition completely off between starts. It has to show a code 31 (and 24) before it will go in limp home mode.

I have seen this before. Sometimes it takes a few start cycles before the MIL light comes on with the AFM unplugged. Then it will run as JJ says. If it is unplugged and the MIL light is off, it won't stay running, but should crank and fire briefly.