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

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

Outline

Block Diagram


Operation

Intake valve timing determination

Output duty ratio determination


Mode name

Control description

Control conditions

Feedback mode

  • Continuously monitors the intake valve timing if it matches the target intake valve timing determined according to the engine operation condition, and controls the output duty ratio based on the result.

  • Except for energization cut mode and phase holding mode

Energization cut mode

  • If there is any malfunction in the electric variable valve timing driver, the intake valve timing is held at the maximum retard position to stabilize the engine speed.

  • Electric variable valve timing driver malfunction

Phase holding mode

  • To improve the startability, the phase of the electric variable valve timing actuator is held at the intermediate position after the engine is stopped.

    Applied VIN (assumed): JM3 KE2*E*D# 100001?148106

  • After the engine is stopped (within a specified time)

    Applied VIN (assumed): JM3 KE2*E*D# 148107?

  • After the engine is stopped (Depending on the engine coolant temperature, operates after a certain period has elapsed from when the engine was stopped to suppress heating of the electrical variable valve timing motor.)


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