Dodge Colt/Challenger/Conquest/Vista 1971-1989 Repair Guide

System Self-Diagnosis Test

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Operate the engine for five seconds or longer, but don't move the vehicle. Turn the key to the Lock position and depress the brake pedal. Turn the key to the On position. A sound dull clicking should be heard from the modulator solenoid. If the operating sound can be heard the solenoid is operating correctly.

 
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