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Are sure you're shorting the diagnostic connector pins T1 to Te1 then turn the key on without starting the engine (key on engine off or KOEO)? if you are, one of the conditions to go into diagnostic mode isn't being met. they are:
-battery voltage above 11v (test with voltmeter)
-throttle plate closed (IDL cirtcuit has to be closed) test TPS with voltmeter... possible to bypass it
-trans in P or N
-AC switch off
-engine at operating temp (I've tested it at room temp so this one is dubious)
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'90 Cressida, 7M-GE, M5 (2JZGE-T coming)
'91 Toyota Pickup, 22R-E, M5
'90 Suzuki VX800
"You don't get to judge me for how I fix what you break"
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