C
CAJUN C4
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I believe OBD 11 started in 96' ?
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I believe the OBDII was introduced in the 94 model year. The ECM should have cooling fins on it. The cars equiped with the OBDI had the 4L60 Automatic transmission which was cable operated for the shift points. When they went to the 4L60E (The E is for electric shift) transmission they had to go to OBDII because the shifting of the transmission was controlled by the ECM electrically.
94 and 95 base cars have partial OBDII capability which was part of GM's so-called "early-rollout of OBDII". The engines in those cars have partial OBDII systems and the ECM's will set some OBDII DTCs but none of them turn on the MIL. Only OBDI codes turn the light on in those cars. A scan tester which supports partial OBDII on OBDI systems can read those codes.
Because of the partial OBDII capability, 94 and 95 base cars do not support flash-code diagnostics nor will they display DTCs on their IPs. The FSM says they will, but they won't.