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Home >> Geo >> 1993 >> Prizm Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> Clearing Codes
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Clearing Codes

Turn ignition switch to OFF position. Disconnect negative battery cable, or remove EFI F-HTR fuse in underhood fuse/relay block, for at least 30 seconds. ECM fault code memory is now clear. Connect negative battery cable or install EFI F-HTR fuse. If negative battery terminal is removed to clear ECM memory, clock and radio memory will also be erased.