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Home >> Ford >> 1991 >> Cutaway 7.3 M >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Electronic DISTRIBUTORLESS Ignition System (EDIS) 4.0L Engine >> Test 41, Check Saw For Short In EDIS Module
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Test 41, Check Saw For Short In EDIS Module

With key off, connect ECA. Set DVOM to 20-volt scale. Push EDIS diagnostic cable SAW button. 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, SAW is shorted in EDIS module. Replace EDIS module. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes. If voltage is not 5-7 volts, go to next test.