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Home >> Oldsmobile >> 1990 >> Custom Cruiser >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Tests W/Codes) >> ECM Code Charts >> Code E23: Est Circuit Problem >> Test Conditions

Test Conditions

WARNING: This page is about a different car, the 1990 Cadillac Fleetwood and 1990 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.

Key on and RPM greater than or equal to 648.