General Testing Description

The Powertrain Control Module (PCM) stores the self test program in its permanent memory. When activated, the EEC system checks and tests it's memory integrity and processing ability. The self test will verify various sensor and actuator connections and proper operation.

These tests are designed to:
- Test major subsystem elements
- Be used without special external test equipment
- Minimize manual diagnostic time

The self test is divided into three separate tests:
- Key On Engine Off (KOEO)
- Key On Engine Running (KOER)
- Continuous Self Test

The self test is not a conclusive test by itself, but is used as a part of the functional Quick Test diagnosis procedure.