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.
KD1 - Enter Output State Diagnostic Test Mode
1994 Ford Aerostar AWD V6-245 4.0LSECTION KD1 - Enter Output State Diagnostic Test Mode
NOTE: Do not use STAR tester for this step, use 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 Data Link Connector (DLC) and positive test lead to B+.
- Jumper STI circuit to SIG RTN at the Self-Test connector.
- Perform Key On Engine Off Self-Test until the completion of the Continuous Memory Diagnostic Trouble Code (DTC). Quick Test Appendix (Detailed Testing Instructions)
- DVOM will indicate less than 1.0 volt when test is completed.
- Depress and release the throttle.
- Does voltage increase?
Yes -- Remain in Output State test mode. Go to KD2. KD2 - Check Canister Purge Solenoid Electrical Operation
No -- Depress throttle to Wide Open Throttle (WOT) and release. If STO voltage does not go high, leave equipment hooked up and perform pinpoint test step QC1. QC1 - Check For Codes 23, 53, 63, 121, 122 or 123
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.