Before connecting or disconnecting E.C.U. harness connector to or from any E.C.U., be sure to turn the ignition switch to the "OFF" position and disconnect the negative battery terminal in order not to damage E.C.U. as battery voltage is applied to E.C.U. even if ignition switch is turned off. Otherwise, there may be damage to the E.C.U.
Failure to disconnect negative battery terminal before connecting/disconnecting ECU harness may damage E.C.U.
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When connecting E.C.U. harness connector into E.C.U. or disconnecting it from E.C.U., take care not to damage pin terminal of E.C.U. (Bend or break).
3
Make sure that there are not any bends or breaks on E.C.U. pin terminal, when connecting pin connectors into E.C.U.
4
When connecting E.C.U. harness connector, tighten securing bolt until red projection is in line with connector face.
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Before replacing E.C.U. perform E.C.U. input/output signal inspection and make sure whether E.C.U. functions properly or not. (See page EF & EC-120.)
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6
After performing this "Diagnostic Procedure", perform E.C.C.S. self-diagnosis and driving test.
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