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Mazda CX-5 Service & Repair Manual: Hydraulic Variable Valve Timing Control

Mazda CX-5 Service & Repair Manual / Engine / Control / Hydraulic Variable Valve Timing Control

Outline

Block Diagram


Operation

Exhaust valve timing determination

OCV drive current determination

Range mode table


Mode name

Control description

Cleaning mode

  • Cleaning mode is to remove foreign material in the OCV oil passages.

    • Mode execution condition

    • During deceleration fuel cut

    • Engine speed: 2,250?3,500 rpm

    • Engine coolant temperature: 80°C {176°F} or more

Cam advance mode

  • If the cam advance is appropriate according to engine operation conditions such as while in torque down execution during idling, the cam advance mode advances the exhaust valve timing and stabilizes the engine speed.

    • Mode execution condition

    • When any of the following conditions is met:

      • During engine cranking

      • Idling

      • Engine speed: Less than 800 rpm

      • Engine coolant temperature: Less than 60 °C {140°F}

Feedback mode

  • The feedback mode constantly monitors whether the target exhaust valve timing is the determined value according to the engine operation conditions and controls the OCV drive current based on the results.

    • Mode execution condition

    • Except cleaning mode, cam maximum retard mode


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