Jeep Wrangler/YJ 1987-1995 Repair Guide

Wide-Open Throttle (WOT) Switch



See Figure 1

  1. Unplug the harness terminal connector from the WOT switch.
  3. Test the on-off operation of the switch with a digital volt-ohmmeter while operating the switch manually.
  5. The resistance should be infinite when the throttle is closed and a low resistance should be indicated when the throttle is wide open. Test the switch operation several times and replace the WOT switch is defective.
  7. Engage the wire harness connector. With the ignition switch ON , test the WOT switch voltage at the diagnostic connector terminals D2-6 (+) and D2-7 (-). The voltage should be zero at the WOT position and greater than 2 volts if not at the WOT position.

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Fig. Fig. 1: WOT switch location

  1. If the voltage is always zero, test for a short circuit to ground in the wire harness or switch, or an open circuit between terminal 8 of the ECU connector and the switch connector. Repair or replace the wire harness as necessary.
  3. If the voltage is always greater than 2 volts, test for an open circuit in the wire or connector between the switch and ground. Repair as necessary.