4WD Low Circuit

Measure voltage between test pin No. 12 and test pins No. 40 and 60 at the breakout box while cycling the Overdrive Cancel Switch (OCS). Move transfer case lever between 4WD and 2WD positions several times. If voltage cycles, remove breakout box. Replace ECA and rerun QUICK TEST. If voltage does not cycle, go to step 9) for driveability faults or next step for other faults.