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Home >> Ford >> 1991 >> Bronco 4.9 Y, Standard, M5OD-R2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Electronic DISTRIBUTORLESS Ignition System (EDIS) 4.0L Engine >> Test 36, Check For IDM Short To Ground In Harness
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Test 36, Check For IDM Short To Ground In Harness

With key off and ECA disconnected, disconnect EDIS module from EDIS module tee. Leave EDIS cable connected to vehicle harness connector. Set DVOM to 20-k/ohm scale. Measure resistance between breakout box pins No. J41 (IDM E) and J7 (BAT -). If resistance is less than 5 ohms, repair short circuit. Remove all test equipment, and reconnect all components. Clear Continuous Memory, and check for fault codes. If resistance is greater than 5 ohms, go to next test.