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 40 (5.0L EFI EEC IV TESTING)QUICK TESTSKEY ON/ENGINE RUNNING 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 Pickup, 1986 Ford Econoline, 1986 Ford Club Wagon, and 1986 Ford Bronco. 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. 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 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.