Test 7, Check Dis Module VBAT
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.
Install diagnostic cable. Connect diagnostic cable to breakout box. Use 2.3L overlay. Connect LED test light between breakout box pins No. (-) J2 (IGND D) and (+) J5 (VBAT D). Turn key on. If test light is on, go to next test. If test light is not on, check connectors, repair or replace harness and check for fault codes. If vehicle still does not start, go to next test.