7M TCCS
The Toyota 7M straight six was the last generation M series engine used in the 87-92 Toyota Supra and Cressida. Lots more info on the history of the M series can be found here .
Two versions were offered, the N/A 7M-GE, and the turbocharged 7M-GTE using the CT-26 turbo.
The 7M uses Toyota's TCCS engine management system based around the Denso 151801-XXXX microprocessor.
To begin, we will study the simplest version of the 7M TCCS, the single-board 89661-14092 designed for the 7M-GE M/T from 87-88 The following photos show the internal layout of the ECU (note the processor has been removed in these photos).
The processor was removed and the internal ROM data read out using a circuit described by Kashi [http://kaele.com/~kashima/ ]. This data can be fed to the Toshi disassembler described elsewhere in this Wiki to extact the assembly code.