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

Mazda CX-5 Service & Repair Manual / Engine / General / Variable Valve Timing Mechanism

Outline

Structural View


Structure


Part name

Function

Hydraulic variable valve timing actuator

The hydraulic variable valve timing actuator operates according to the hydraulic pressure and changes the phases of the exhaust camshaft.

Electric variable valve timing actuator

The electric variable valve timing actuator changes the phases of the intake camshaft.

Electric variable valve timing motor/driver

Operates the electric variable valve timing actuator based on the signals from the PCM.

OCV

Operated by current (duty signal) from the PCM. Controls the hydraulic oil passages to the hydraulic variable valve timing actuator.

Intake camshaft position sensor

Sends the intake camshaft position signal to the PCM.

Exhaust camshaft position sensor

Sends the exhaust camshaft position signal to the PCM.

Crankshaft position sensor

Sends the crankshaft position signal to the PCM.


Operation

At engine start

Light/medium load range

* Energy loss which occurs from each type of resistance corresponding to intake and exhaust is called pumping loss.

High load range

Valve Mechanism
Outline A DOHC type valve system has been adopted and consists of four valves (two intake valves and two exhaust valves) per cylinder for a total of 16 valves operated by two camshafts. ...

Belts, Hoses, Pulleys
...

Other materials:

Front Door Removal/Installation
WARNING: Removing the front door without supporting it could cause the front door to fall and cause serious injury. Always perform the procedure with at least one other person to prevent the front door from falling. CAUTION: When the front door checker securing bolts are ...

Ion Sensor
Purpose/Function Detects ion generation in the combustion chamber for detecting pre-ignition. Detects ions which occur due to fuel combustion as current by applying bias voltage to the spark plug, which is amplified in the ignition coil internal circuit and input to the PCM. ...

Door Ajar Warning Light
Purpose The door-ajar warning light notifies the driver that any door or the liftgate is open. Function When the instrument cluster receives any of the following signals sent from the rear body control module (RBCM) via the CAN signal, the door-ajar warning light illumin ...

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