Taurus V6-183 3.0L VIN U FI (1993)
Combination Switch: Testing and Inspection
Multi-Function Switch Diagnostics
Ignition Switch Continuity Test
Continuity Test
Disconnect the multiple connector from the ignition switch. Test the switch continuity as described in the following illustration. Connect a
self-powered test lamp or ohmmeter between the blade terminals indicated on the chart. No continuity between any blade and chassis ground should
exist in any switch position except the proof Circuits, 41 and 977 in the START position only.
For an "engine won't crank" condition, determine if the condition exists with the shift lever in both 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 neutral
start switch located on the transaxle.
Ignition Switch Mechanical Test
Mechanical Test
Test the steering column ignition system mechanical operation by rotating the lock cylinder/key through all switch positions. The movement should
feel smooth with no sticking or binding. The ignition system should return from the START position back to the RUN position without assistance
(spring return). If sticking or binding is encountered, check for the following:
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Burrs on the lock cylinder key
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Binding lock cylinder
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Shroud rubbing against lock cylinder
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Burrs or foreign material around rack-and-pinion actuator in lock cylinder housing
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Insufficient lube on actuator
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Binding ignition switch
NOTE: Do not apply lubricant to the inside of the ignition switch.
Mechanical Multifunction Switch Diagnosis
Switch, Multi-Function
