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Home >> Mazda >> 2021 >> CX-30 Turbo Premium >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 17 (Engine Mechanical System (VIN M)) >> OCV For Hydraulic Variable Valve Timing System Inspection >> Hydraulic Variable Valve Timing Control System Operation Inspection >> When idling can be continued >> Spool valve operation inspection

Spool valve operation inspection

WARNING: This page is about a different variant/trim than selected.
  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(US)] .)
  2. Remove the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)
  3. Verify that the spool valve in the OCV for hydraulic variable valve timing system is in the maximum valve timing advance position as indicated in the figure.
    G09785076Courtesy of MAZDA MOTORS CORP.
  4. Verify that the battery is fully charged. (See BATTERY INSPECTION [(US)] .)
    NOTE:
    • When applying battery positive voltage between the OCV for hydraulic variable valve timing system terminals, the connection can be either of the following:
      • Positive battery cable to terminal A, negative battery cable to terminal B
      • Positive battery cable to terminal B, negative battery cable to terminal A
    G13174639Courtesy of MAZDA MOTORS CORP.
  5. Apply battery positive voltage between the OCV for hydraulic variable valve timing system terminals and verify that the spool valve operates and moves to the maximum valve timing retard position.
    G09785078Courtesy of MAZDA MOTORS CORP.
  6. Stop applying battery positive voltage and verify that the spool valve returns to the maximum valve timing advance position.
  7. Install the OCV for hydraulic variable valve timing system. (See OCV FOR HYDRAULIC VARIABLE VALVE TIMING SYSTEM REMOVAL/INSTALLATION .)
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