P052

Code PO52:

PCM Circuit:

DESCRIPTION:
This diagnostic test monitors the PCM's keep alive memory for a loss or unintended change of data. If such a condition occurs, Code P052 is set.

TEST CONDITIONS:
Test continuously.

FAILURE CONDITIONS:
Keep alive memory checksum does not match previous checksum.

ACTION TAKEN:
None.

NOTES ON INTERMITTENTS:
If the battery has been disconnected for any reason Code P052 will set.

The PCM keeps a running check on the memory; if memory changes, it resets.