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Home >> Ford >> 1990 >> Bronco II RWD, Standard, M5OD-R1 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Test FD - Brake On/Off (Boo) Switch >> Test FD: Step 6
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Test FD: Step 6

6) Check BOO Circuit For Short to Power  Turn key off. With breakout box installed and ECA disconnected, set DVOM on 20-volt scale. Disconnect BOO circuit harness connector. Measure voltage between test pin No. 2 and an engine block ground. If voltage is greater than 1.0 volt, repair short circuit, Remove breakout box, reconnect all components and repeat KOER Self-Test. If not, go to next step.