Diagnostic Aids

Code 53 indicates that the ECM lost the distributor signal after the engine was started. If these distributor reference pulses are interrupted for a short period of time, the engine may not stall but Code 53 will be stored. If the pulses are interrupted for an extended period of time, the engine wil1 stall, Code 53 wil1 be stored, and Code 12 will be set upon attempting to restart. If a Code 53 is being stored but does not result in a no start condition, it should be treated as an intermittent Code 12.