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Yes, the temperature dependence is not typical with a boost leak. Also a boost leak sets code 34 which is why I asked about any codes. An ignition issue is also possible. DO you have access to an ignition scope?

Ref: http://www.supramania.com/forums/showthread.php?t=72109&highlight=stepper Author: Figgie The Toyota IAC is a 6 pole design stepper. Usually labeled S1-S2-S3-S4 for the switching ground and B1-B2 for the 12+ vdc. This automatically makes the stepper motor a unipolar designed stepper motor...

Nope. Even with the knock sensor codes set you will still have a running engine but with very conservative timing. This problem sure does sound like a boost leak, but that will set a code 34 and the MIL will flash. I didn't see anywhere in the thread that you checked for any codes. Obviously...

starter.... fat fingers!

You can get a list of the codes here. http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=26 Code 43 is a problem with the starter (STA) signal to the ECU.

ECT = engine coolant temp. Its standard OBD speak. The datasheet looks good. Thanks for posting.

Assuming that this is not an automatic with a bad NSW, then 51 would be a TPS issue (what he originally posted was 52 which is a knock sensor problem, which is why everyone is confused). Here is how to adjust it... http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=103

No, with the ignition on and the engine not running the HT line should be 0.5-1.0 V.

The HT line can be controlled by the ECU, so it can be either grounded and open-circuit depending on what the ECU commands. There is a 0.56ohm resistor in series with a transistor (usually called T713) that controls the heater current. The line ultimately grounds to pin E01. With ignition on...

Jeez, Toyota went to a lot of trouble to build in self-diagnosis, so the owner can then look up the code and find out what to fix. Seems almost straightforward?

JJ, the ECU reads HT current, so grounding the sensor HT line is going to set a code.

M1 is behind the glovebox. Connects engine harness to instrument panel harness. See this link. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=28

Alarm does not control the ECU power, so that is not it. Not sure what year yours is, but the ignition circuit didn't change much. Here is a good starting point. http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=40

Toyota still sells the moldings. I bought the upper hatch molding a few months ago, I think it was around $80, and includes the window washer. I haven't got the courage to actually try to remove the old one yet. Looks kind of tricky from all the clips built-in to the new one.

Cost you an O2 sensor that was perfectly good, and couldn't possibly have been the problem anyway.

The ECU controls the B+ power line through the main relay using the MREL signal. B+ is the main power bus of the ECU, and applying 12V to the IGSW line will normally energize the main relay. Since it is not working, check for 12 V on the IGSW line and trace back if that is dead.

div d, #xx places quotient in B and remainder in A. Note that if A >= #xx then this is a NOP with carry = 1 there are a bunch of shifts. For example SHR is a logical shift and SHRA is an arithmetic right shift and RORC is a right rotation. The argument for opcode 39h is 8 bits, it is...

st a, [y] stores the data in register A to the RAM location pointed to by register Y . The pointer in Y is automatically incremented afterwards. xch a,b exchanges the contents of register A and B. cmpb a, #0x08 does a binary compare of each bit in register A with the corresponding bit in the...

If it looks like this, it is probably the ADC interrupt handler. Similar coding is used for injector programming. ld y, #0F896h ; load table base for channel jump address and a, #00000111b ; isolate previous ADC channel 0 <= a <= 7 shl a ; x2 since 16 bit table add y, a ; compute...

Yeah, the human side to making things by big corps is often suppressed. I am hoping someone who reads Japanese can decipher some of it.