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Home >> Jeep >> 1989 >> Comanche Eliminator, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> 4.0L MPFI CEC Testing >> System Testing >> Knock Sensor Test
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Knock Sensor Test

  1. Connect M.S. 1700 Diagnostic Tester to vehicle. Proceed to state display mode. Start engine and observe knock unit value. Using the tip of a screwdriver, gently tap cylinder block near knock sensor and observe knock value.
  2. Knock value should increase while tapping on cylinder block. If knock value does not increase while tapping on cylinder block, then check knock sensor for proper connection. If connection is good, replace knock sensor.
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