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, NP435REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSIS5.0L/5.8L FEEDBACK CARBURETOR TESTS W/CODESQUICK TESTSTEST Z - KEY POWER TEST
1985 Ford Bronco 5.8 G, Standard, NP435
Test Z - Key Power Test
1985 Ford Bronco 5.8 G, Standard, NP435SECTION Test Z - Key Power Test
- Turn ignition off and wait 10 seconds. Install breakout box with ECA connected. Set DVOM on 20 volt scale, connect leads to pins 5 and 60. Perform Engine Running Self-Test. If DVOM reading exceeds 17.5 volts during Self Test, repair charging system. If reading remains below 17.5 volts and code 65 is present, replace ECA and repeat Self Test. If DVOM remains below 17.5 volts and code 65 is not present, go to step 2 .
- Perform KEY ON-ENGINE OFF (KOEO) SELF-TEST . If code 65 is not present, charging system is okay, test complete. If code 65 is present, check charging system.
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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.