How to test a VTEC system on a 1999 Honda Accord. Using either a scan tool or multimeter. Also how to identify switch input and output solenoid design using a wiring diagram.

Engine Performance Diagnostics chapter 3 pages 3-8 (solenoid test) and chapter 2 (pressure switch tests)

symptoms 50

  • trouble code P1259
  • check engine light
  • low power (intermittent)

fix 50

  • VTEC solenoid

test shown enh 50

  • how to test the VTEC oil pressure switch
  • how to test the VTEC solenoid
  • how to test the computer driver for the solenoid
  • how to check the hydraulic part of the VTEC system

Tools used

  • scan tool
  • digital multimeter
  • jumper wire
  • back-probing tool
  • incandescent test light

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(Chapter 3) Transistors, Solenoids, Computer Controlled Output Testing

Related videos:

How to test Intake Valve Control Solenoids (codes P0028, P0082) - Subaru:


How to test a computer controlled solenoid (energizing the circuit manually):


How to test cam/crank actuator solenoids (P0010, P0013) 2008 GM 2.4 L :


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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

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