KOEO Wiggle Test Procedure

1991 Mercury Cougar LS, 3.8 4SECTION KOEO Wiggle Test Procedure

Connect test equipment. See Figure. Turn ignition on and activate self-test with jumper lead or diagnostic tester. Wait 10 seconds, deactivate, and then reactivate self-test. Wiggle test mode is now activated. Tap, move and wiggle the suspected sensor and/or harness area. If a fault is detected, a service code may be stored in memory and indicated at the diagnostic tester or "Scan" tool. Record or retrieve code and perform test indicated by appropriate CONTINUOUS MEMORY CODES chart under the CONTINUOUS CODE/TEST MENU table.

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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.