Test 28, Check Pip EEC Circuit For Short To Ground
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 1991 Ford Ranger, 1991 Ford RV Cutaway, 1991 Ford Pickup, 1991 Ford F-Super Duty, and 1991 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
Connect LED test light between breakout box pins No. (-) J31 (PIP EEC) and (+) J57 (BAT+). If test light illuminates, PIP EEC is shorted to ground. Check connectors, repair or replace harness and check for fault codes. If test light does not illuminate, replace DIS module, and check for fault codes.