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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 Km - WAC & A/C Demand Switch >> Test Km: Step 31

Test Km: Step 31

31) Check Continuity of A/C Demand (ACD) Circuit  Turn key off and wait 10 seconds. Install breakout box leaving ECA disconnected. Set DVOM on 200-ohm scale. Measure resistance between test pin No. 43 (No. 24 on 2.3L OHC PFI) at the breakout box and A/C demand switch. If resistance is greater than 5 ohms, repair open in ACD circuit and rerun QUICK TEST. If resistance is less than 5 ohms, EEC-IV system is okay. Remove breakout box and reconnect components. Diagnose A/C system.

NOTE: There is a break in the step numbering sequence at this point, skipping from step 31) to step 35). Break is due to previous chart references to these testing procedures. No test procedures have been omitted.