Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
General Testing Description
1993 Ford E 350 Van V8-7.3L DSLSECTION 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.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.