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The CAD files for the ECU read board are on Assembla.com in the 7M_TCCS project space. I don't have any plans to make more of these boards, so I thought I would make the files available in case anyone decides they want to make their own boards.

This was posted on the supras.com email list by Hines. Never seen anything like it myself. According to one person on the list, it is a Build Sheet, or a KanBan.It follows the car all through the build process to make sure it gets the equipment specified.

There are three main 2D maps in the v1332 code used on 90+ 7MGTEs. They all go up to 6400 rpm, after that the last number in the table is clamped. Resolution is 400 rpm and C00h load units. In-between values are linearly interpolated in 2 dimensions. No extrapolation is allowed for values above...

There is a grand total of 16 bytes of stored data, and one of those bytes is used to tell the ECU that there is valid data in the other 15 bytes, so that is a total of 15 bytes for stored useful data. Some of those 15 bytes are used to store fault codes, there is even less learned! The target...

Any chance this is a California spec car? When 25/26 come on at the same time it means either the OX sensor signal is switching too fast, or the cylinder to cylinder rpm variation is too large, a crude misfire detection. This capability was only in the CA spec ECU though. Do you have any...

With the IGN on, just wiggle the harness looking for rub points that blow the fuse. The starter is just causing the engine to move around, and you can usually get the same effect by moving the harness.

I have been working quite hard on the ECU code. Here is some useful info if you are reversing tables. Temps are given by the following formula: coolant temp = THW - 40 (degC). air temp = THA - 40 (degC) The computed speed is in km/h. The computed rpm is RPM*5.12. The inputs to these...

You need to measure the line temps with sub-degree accuracy, so that means a decent thermocouple setup is a must. You need to place the thermocouple on the pipe, then wrap it in insulation so your hands are not touching it. I like to use that gooey thermal pipe wrap that some people call...

What is your subcooling on one of these hot days?

Since the condenser is in front of the radiator, the only reason it would not be cooling sufficiently is if there is inadequate air flow from a fan/shroud issue, blockage from debris, or corrosion and damage to the condenser fins, assuming the A/C is in otherwise good working order.

The stock alternator output wire is connected to the battery, but through a 100A fuse. That fuse protects you from a short circuit in the alternator, or in the alternator wiring. I would be very nervous if my car bypassed that wiring, because then alternator becomes the fuse, and that can lead...

:icon_bigg

More likely over-pressure, not temps, although obviously there is a relation.

The 2000GT instrument cluster looks a lot like the MK3's.

Also goes to the heater water valve

The alarm does not interface with the ECU. All it can do is disable the starter.

If you have no power at BATT, then that is your problem. Strictly speaking, it will still run as long as you have power at B+ and IGSW, but since B+ gets its power from the same source as BATT, chances are its not going to run. Power at IGSW is all you need to turn on the main relay, so even...

http://www.cygnusx1.net/supra/TechTips/engine_error_codes.aspx

You were going to check for ECU codes. Go back and do it. You only need a paper clip and your eyeballs.

Measure some data, use it to identify the problem, and fix it. Don't guess.