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The A/C off TPS opening value is a single byte at memory address 0xFA0B. The value is stored as twice the TPS opening percentage. (i.e. the factory default is 159, or 79.5%) There is also a hard-coded hysteresis of 10%, meaning that once the A/C turns off at 79.5%, it won't turn back on until the TPS drops below 69.5%. Since this is a hard-coded value, the address changes between ECU revisions. In the '93 manual/federal spec ECU it is 0xAEB0.
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