ECM Code EO53: Distributor Signal Interrupt: Action:

Code EO53 is stored as a history code.

Code EO53 is set if ECM does not receive distributor reference pulses from HEI for more than .4 second. Since DFI system requires HEI pulses in order to fire the injectors, most occurrences of Code EO53 will be accompanied by a stall.

Code EO53 can be set by ignition switch contact timing when turning key off. If ignition No. 3 contacts (HEI feed) open before ignition No. 1 contacts, a Code EO53 may be set.