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.
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HOMESERVICE MANUALSFORD1985THUNDERBIRD BASE, 2.3 W, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSIS1.6L & 2.3L EFI/TURBO TESTSTESTINGKEY ON/ENGINE OFF (KOEO) SELF-TEST PROCEDURE
1985 Ford Thunderbird Base, 2.3 W, Automatic
Key On/Engine Off (KOEO) Self-Test Procedure
1985 Ford Thunderbird Base, 2.3 W, AutomaticSECTION Key On/Engine Off (KOEO) Self-Test Procedure
- This is a static check of processor input and output circuits. Connect STAR tester or VOM to vehicle Self-Test connector. See Fig 1 for correct VOM connections. Turn ignition switch to ON position to start Self-Test. DO NOT depress throttle during test. Observe and record all On Demand and Continuous/Memory service codes.
- If any codes appear, refer to the proper test shown in the reference table for that specific engine. Start with the first code displayed. If the tests refer you to other checks, perform them as instructed. When more than 1 code is displayed, repair problems in the order that codes are displayed.
NOTE:
When any repair has been completed, Quick Test MUST be repeated BEFORE attempting to repair any other problems identified by service codes. Proceed with repairs as indicated by Key ON/Engine OFF Self-Test Results table and then by On Demand Codes table.
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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.