ECM Code EO52, ECM Memory Reset: Action:

Code EO52 is stored as a history code.

This code indicates that long-term memory in ECM has been reset. This will result whenever power is removed from ECM (i.e. disconnecting battery cables, disconnecting ECM connector, etc.). Code should be cleared from memory after restoring ECM's power supply.

If Code EO52 is seen accompanied by complaint of engine stall, stumble, lights flashing or other stored codes, check for intermittent loss of power or ground to ECM on circuit No. 480. Manipulate wiring and connections with engine running. Unplug and plug ECM connectors to ensure that they are latched.

Fig 1: ECM Code EO52 Circuit Diagram