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 V8-351 5.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSKC - SECONDARY AIR INJECTION SOLENOIDSKC5 - ENTER OUTPUT STATE DIAGNOSTIC TEST MODE
1994 Ford F 250 2WD Pickup V8-351 5.8L
KC5 - Enter Output State Diagnostic Test Mode
1994 Ford F 250 2WD Pickup V8-351 5.8LSECTION KC5 - Enter Output State Diagnostic Test Mode
NOTE: Do not use STAR tester for this Step. Use a Analog Volt/Ohm Meter (VOM)/Digital Volt/Ohm Meter (DVOM).
- Key "OFF".
- Disconnect electrical connector on the speed control servo, if equipped.
- DVOM on 20 volt scale.
- Connect DVOM negative test lead to Self Test Output (STO) circuit at the Data Link Connector (DLC) and positive test lead to battery positive.
- Jumper STI circuit to SIG RTN at the DLC.
- Perform Key On Engine Off Self-Test until complete output of all Continuous Memory Diagnostic Trouble Codes (DTCs). Quick Test Appendix (Detailed Testing Instructions)
- DVOM will indicate less than 1.0 volt when test is complete.
- Depress and release the throttle.
- Does voltage increase?
Yes -- Remain in Output State test mode. Go to KC6. KC6 - Check AIRB and AIRD Solenoids Electrical Operation
No -- Depress throttle to Wide Open Throttle (WOT) and release. If STO voltage does not go high, leave equipment hooked up and go to pinpoint test step QC1. QC1 - Check For Codes 23, 53, 63, 121, 122 or 123
RENDER: 1.0x
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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.