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VTEC Spool Valve

  1. Disconnect the 2 pin connector from the spool valve. See Fig 1 .
  2. Measure resistance between the Yellow (front cylinder head) or Blue/Yellow (rear cylinder head) terminal and body ground. Resistance should be approximately 14-30 ohms. See Fig 1 .
    Fig 1: Testing VTEC Spool Valve Resistance
    G00125720Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. If the resistance is within specifications, remove the spool valve assembly from the cylinder head and check the spool valve filter for clogging. If there is clogging, replace the engine oil filter and engine oil. See Fig 2 .
    Fig 2: Inspecting VTEC Spool Valve
    G00125721Courtesy of AMERICAN HONDA MOTOR CO., INC.
  4. If filters are normal, push the spool valve with your finger and check its movement. If spool valve is normal, check the engine oil pressure. See Fig 3 .
Fig 3: Testing VTEC Spool Valve Operation
G00125722Courtesy of AMERICAN HONDA MOTOR CO., INC.
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