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 MANUALSFORD1985BRONCO 5.8 G, STANDARD, TODREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (2.3L EFI EEC IV TESTING)QUICK TESTSKEY ON/ENGINE RUNNING (KOER) SELF-TESTCODE OUTPUT
1985 Ford Bronco 5.8 G, Standard, TOD
Code Output
1985 Ford Bronco 5.8 G, Standard, TODSECTION Code Output
WARNING: This page is about a different car, the 1986 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
- Deactivate SELF-TEST (disconnect jumper wire). Start and run engine at 2000 RPM for 2 minutes to warm up EGO sensor. Turn engine off and wait 10 seconds. Insert jumper to activate SELF-TEST . DO NOT depress throttle during test unless a Dynamic Response code occurs.
- Start engine. The engine ID code will be displayed. Depress and release brake pedal, 1 TIME ONLY, after engine ID code has been displayed. This will test the Brake On/Off (BOO) switch.
- Run test. If Dynamic Response code 1 (10 with STAR tester) occurs, briefly accelerate engine to wide open throttle (WOT). The KEY ON/ENGINE RUNNING (KOER) SELF-TEST service codes will then be displayed. Observe and record all codes.
NOTE:
The Engine ID code is 1/2 the number of cylinders (a 2 equals a 4 cylinder engine). STAR tester adds a zero to all single digit readings. A "20" on STAR tester equals a 4 cylinder engine. Some vehicles do not require a brief WOT, they will not display a 1 (10).
RENDER: 1.0x
NO RELATED
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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.