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Home >> Ford >> 1991 >> RV Cutaway 7.3 M >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Electronic DISTRIBUTORLESS Ignition System (EDIS) 4.0L Engine >> Test 40, Check Saw At EDIS Module
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Test 40, Check Saw At EDIS Module

With key off, set DVOM to 20-volt scale. Start engine, and measure voltage between breakout box pins No. (+) J21 (EDIS diagnostic cable SAW detector) and (-) J7 (BAT -). If voltage is 5-7 volts, replace EDIS module. If voltage is not 5-7 volts, go to next test.