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 MANUALSFORD1987AEROSTAR VAN PASSENGER, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCEC DIAGNOSING & TESTINGQUICK TESTKEY ON/ENGINE RUNNING (KOER) SELF-TESTTEST RESULTS & ACTION TO TAKE
1987 Ford Aerostar Van Passenger, Standard
Test Results & Action To Take
1987 Ford Aerostar Van Passenger, StandardSECTION Test Results & Action To Take
- If NO CODES appear, repeat SELF-TEST and verify that no service codes are present, and then go to TEST HH - NO CODES/CODES NOT LISTED , step 1). If engine ID code is 2, 3 or 4 (20, 30 or 40 with STAR tester), and code 11 is displayed, ENGINE RUNNING SELF-TEST portion is okay. If symptom was of an intermittent nature, go to CONTINUOUS SELF-TEST . If symptom is present, go to DIAGNOSIS BY SYMPTOM TEST . Otherwise QUICK TEST is complete, and EEC-IV system is okay.
- If Engine ID code is 2, 3 or 4 (20, 30 or 40 with STAR tester), and any code other than 11 appears, ENGINE RUNNING SELF-TEST portion is at fault. Perform the test indicated in the KEY ON/ENGINE RUNNING CIRCUIT TEST MENU 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 one code is displayed, repair problems in the order that codes are displayed. Whenever a repair is made repeat QUICK TEST .
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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.