How to Test a VTEC Solenoid


The VTEC solenoid transforms electrical energy into mechanical energy. Signs of a faulty solenoid include a loud screeching sound from the engine, a sluggish or slow engine and the appearance of the "Check Engine" light. You can test the solenoid if you suspect it isn't working properly. If it's not in working condition, you must replace it.

Things You'll Need

  • 12 volt battery
  • Turn the ignition to the "On" position.

  • Connect a 12-volt battery to the solenoid wire, and ground the housing. If the solenoid is in working condition, you should hear a clicking sound. If you do not hear a clicking sound, you should ensure a proper connection between the solenoid wire and the ECU.

  • Ensure a proper connection between the yellow solenoid wire and connector "A17" on ECU "A."

  • Drive the vehicle. If the engine seems sluggish or makes loud sounds, turn off the vehicle and replace the faulty solenoid.

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  • Roberto Lorenzutti, Auto Mechanic; Brooklyn, New York
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