October 5, 200916 yr Has anyone tried replacing an '87 SPFI ECU (22611 AA200 / MECF-011 / xxxx 3E / N) with an '89 SPFI ECU (22611 AA392 / MECF-022 / xxxx 4E / 42)??? (ECU label differences hi-lighted in red)! The ECU plugs appear to be the same. 1) Are the pin outs the same? (I have info for '89 but not '87). 2) I know there is an extra sensor (EGR gas temp) on the '89 intake manifold. It is wired (w/r) to ECU pin 38. Unplugging it does not seem to make any diff. - no CHECK ENGINE or ECU codes. '89 FSM says it should cause code 55 (California only - which this car is) for open/short, but it doesn't happen! The rest of the stuff on the engines looks to be the same although one or two sensor electrical connectors are different.
October 6, 200916 yr All the SPFI ECU's are interchangable. Some will recognize the EGR temp sensor and some will not. Doesn't matter for the functionality. GD
October 6, 200916 yr Author All the SPFI ECU's are interchangable. Some will recognize the EGR temp sensor and some will not. Doesn't matter for the functionality. GD Wow, that's very good to know. I searched and searched before posting and found very little info about ECUs. Thanks for the prompt reply. TF
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