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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 Tb - A4LD Transmission >> Test Tb: Step 3
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Test Tb: Step 3

3) Check Transmission Vehicle Harness Circuits  With key off, install breakout box, leaving ECA disconnected. Disconnect transmission bulkhead connector. Set DVOM on 200-k/ohm scale. Measure resistance between the appropriate ECA signal output pin and test pins No. 37 and 57 at the breakout box. Measure resistance between the appropriate ECA signal output pin and test pins No. 40, 60 and 46 at the breakout box and at chassis ground. If all resistances are greater than 10 k/ohms, go to next step. If any resistance is less than 10 k/ohms, repair short circuit. Remove breakout box and reconnect components. Rerun QUICK TEST.