1991 Ford Explorer 4D Utility, RWD, StandardFACTORY OEM SERVICE PROCEDURE

Test 3, Check Pip At EDIS Module

DO NOT connect ECA to break- out box while performing EDIS diagnostics unless so directed. Turn key off. Connect EDIS Diagnostic Cable (007-00059) to breakout box (T83L-50-EEC-IV), EDIS module and coil pack. DO NOT connect VR sensor tee. See Fig 1. Use EDIS No. 6 overlay.

Connect EDIS diagnostic cable negative lead to battery, leaving positive lead disconnected. Set EDIS diagnostic cable box to 4/6 CYLINDER position. Set DVOM to 20-volt AC scale. Connect DVOM leads between breakout box pins No. J43 (PIP E) and J7 (BAT -). Crank engine. If settled AC voltage reading is greater than 0.4 volts, go to next test. If settled AC voltage reading is less than 0.4 volts, go to TEST 8.

Fig 1: Installing EDIS Diagnostic Cable
G91E13445Courtesy of FORD MOTOR CO.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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