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.
1999 Mercury Sable V6-3.0L DOHC VIN SFACTORY OEM SERVICE PROCEDURE
Ignition Switch Continuity Test
Disconnect connector C299 from the ignition switch. Test the ignition switch continuity as follows. Connect a self-powered test lamp or ohmmeter between the blade terminals indicated on the chart in the illustration. No continuity between any blade and the ground terminal should exist in any ignition switch position except the proof and ground pins (P-1, P-2 and GND) in the START position only.
For an "engine will not crank" condition, determine if the condition exists with the gearshift lever in both the PARK and NEUTRAL positions before performing the ignition switch continuity test. If the "no-crank" condition occurs in one shift lever position but not the other, a more probable cause is the transmission range (TR) sensor located on the transaxle.
Factory Service Tools
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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.
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