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Spool valve operation inspection

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable.
  2. Remove the oil control valve (OCV).
  3. Verify that the spool valve in the oil control valve (OCV) is in the maximum valve timing retard position as indicated in the figure.
    • If not as specified, replace the oil control valve (OCV).
    Fig 1: Identifying Spool Valve Position - Valve Timing Retarded
    G01929725Courtesy of MAZDA MOTORS CORP.
  4. Verify that the battery is fully charged.
    • If not as specified, recharge the battery.
  5. Apply battery positive voltage between the oil control valve (OCV) terminals and verify that the spool valve operates and moves to the maximum valve timing advance position.
    Fig 2: Identifying Oil Control Valve Connector Terminals
    G01929726Courtesy of MAZDA MOTORS CORP.
    • If not as specified, replace the oil control valve (OCV).
    NOTE:
    • When applying battery positive voltage between the oil control valve (OCV) 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
  6. Stop applying battery positive voltage and verify that the spool valve returns to the maximum valve timing retard position.
    • If not as specified, replace the oil control valve (OCV).
    Fig 3: Identifying Spool Valve Position - Maximum Valve Timing
    G01929727Courtesy of MAZDA MOTORS CORP.
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