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 MANUALSFORD1994F 250 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSKC - SECONDARY AIR INJECTION SOLENOIDSKC12 - CHECK FOR SHORT TO GROUND
1994 Ford F 250 2WD Pickup L6-300 4.9L
KC12 - Check For Short to Ground
1994 Ford F 250 2WD Pickup L6-300 4.9LSECTION KC12 - Check For Short to Ground
- Key "OFF".
- Breakout box installed, Powertrain Control Module (PCM) disconnected.
- Disconnect both Secondary Air Injection Bypass/Diverter (AIRB/AIRD) solenoids.
- Measure resistance between AIRB circuit at the breakout box and test pins 40, 46 and 60. Measure resistance between AIRD circuit at the breakout box and test pins 40, 46 and 60 at the breakout box.
- Is each resistance greater than 10,000 ohms?
Yes -- Go to KC13. KC13 - Check For Short to Power
No -- Service short to ground. Remove breakout box. Reconnect PCM and AIRB/AIRD solenoids. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
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.