Well KOEO is Key ON and the Engine Off and KOER is is Key ON and the Engine Running with the STI wire grounded.
STI is the Self Test In wire to the PCM Computer.
CM is the stored codes for errors that happened while you were driving it. CM stands for Continuous Memory. The portion of KAM used to store DTCs generated during Continuous Self-Test.
Continuous Self-Test is the continuous test of the EEC system conducted by the PCM whenever the vehicle is operating.
KAM stands for Keep Alive Memory.
DTCs are the error codes and DTC stands for Diagnostic Trouble Code With an alpha/numeric identifier for a fault condition identified by the On-Board Diagnostic System.
Now that you know all of that you can run the self-test and also get the CM codes two ways.
You can ground the STI wire, get behind the wheel with paper and pin, turn on the key and count the flashes of MIL lamp in your cluster or you can buy a code reader for about $30.00 and it will count them for you.
Malfunction Indicator Lamp (MIL) is a required on-board indicator to alert the driver of an emission related malfunction. May read either "CHECK ENGINE" or "SERVICE ENGINE SOON."
As the code reader goes here is the one to get at an auto part store or on amazon.
Amazon.com: INNOVA 3145 Ford Digital Code Reader: Automotive
The STI wire is the single wire between the thumb and forefinger. You can ground the STI wire by shoring to pin #2 of the self-test plug.
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