But it turns out that it has no Diag Connector 2 under the dash, the FEN terminal in the diag connector under the hood is populated, and ECU connector #2 has nothing plugged into it. Now the things which plug into connector #2 in the four-connector K8 ECU on the Canadian '96 model are the extra O2 sensors and the EGR boost sensor, which are additions for OBD2. So my car is NOT OBDII. ##It's an OBDI with a four-connector ECU.##
I don't know whether this applies to all late-model European MX-3s, but its a fair bet, as, to the best of my knowledge, European governments did not require OBDII; it was at manufacturers' discretion. I think it's likely to apply to the KLDE cars as well.
What would this mean for swapping in a KLZE? Well, connectors #1, #3,and #4 on the four-connector ECU have the same numbers of pins as #1, #2, and #3 on the three-connector ECU. So, maybe you can just plug in a three-connector KLZE ECU? Not quite, if it follows the scheme in the '96 Wiring Manual. There are about 18 changes to make out of 58. But it could be manageable. Can you just plug in a four-connector KLZE ECU (KL62)? Not if it follows the scheme for four-connector KLDEs - you'd have to change 57 pins out of 58.
Now when did the change from three-connector to four- happen? There are two possible dates according to the Parts Catalogue, the first given as 941201 and the second not given, but some time before 961101, when the part changed from K857... to K861... . Trouble is, I can't tell whether the format is y/m/d or y/d/m, as none of the dates has the m/d field featuring a value higher than 12
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<small>[ August 16, 2004, 10:46 AM: Message edited by: IanL ]</small>