Test 4, Check Pip Out Continuity
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.
With key off, disconnect ECA. Using ohmmeter, measure resistance between vehicle harness connector pin No. 56 and breakout box pin No. J31 (PIP EEC). See Fig 1. If resistance is less than 5 ohms, see CIRCUIT TEST A in TESTS W/CODES article in the ENGINE PERFORMANCE Section. If resistance is more than 5 ohms, repair open circuit, reconnect ECA and retest system. If vehicle still does not start, go to next test.