E052

TEST CONDITIONS
Tested every 0.1 seconds.
TEST: The ECM stores a calculated summation of the data that is in the keep alive memory contents every 0.1 seconds and compares the calculated summation or "Checksum" to the stored summation or "Checksum". If the two checksums do not match, the ECM assumes that information has been erased in the keep alive memory and Code EO52 is stored.

FAILURE CONDITIONS
1. The ECM loses full time power due to loss of battery power or ECM disconnect/reconnect;
or
2. ECM memory changes after key is turned to off--a checksum that was stored at key off doesn't match memory contents at key on;
or
3. With key on, ECM long term memory is erased by ECM fault, circuit fault or transient voltages;
4. ECM power (ignition power) is intermittent with key on.

ACTION TAKEN
1. All block learn values are reset to 128 counts (See ECM learning ability);
2. Code EO52 is is stored as a history code.

DESCRIPTION
Code EO52 indicates that the "long term" memory in the ECM has been reset. This will be the case whenever power is removed from the ECM (i.e. disconnecting battery cables, disconnecting ECM connector, etc.). This code should be cleared from ECM memory after restoring the ECM's power supply.

If Code EO52 is seen accompanied by complaint of engine quit, stumble, telltale's flashing or by other stored codes, check for intermittent loss of power or ground to the ECM on CKT's 480 or 1030 respectively. Manipulate wiring and connections with engine running. Remove and replace the ECM connectors and ensure that they are latched.

Code EO52 indicates that the "long term" memory in the ECM has been reset.

This will be the case whenever power is removed from the ECM (i.e. disconnecting battery cables, disconnecting ECM connector, etc.) This code should be "cleared" from memory after restoring the ECM's power supply.

If Code EO52 is seen accompanied by complaint of engine quit, stumble, telltale's flashing or other stored codes, check for Intermittent loss of power or ground to the ECM on CKT 1605. Manipulate wiring and connections with engine running. Remove and replace the ECM J1, J2 and J3 connectors and ensure that they are latched.