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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:

Oil Filter Replacement
WARNING: Hot engines and engine oil can cause severe burns. Turn off the engine and wait until it and the engine oil have cooled. A vehicle that is lifted but not securely supported on safety stands is dangerous. It can slip or fall, causing death or serious injury. Never work ...

Oil Control Valve (OCV) Inspection
Coil Resistance Inspection 1. Disconnect the negative battery cable.. 2. Remove the plug hole plate.. 3. Disconnect the OCV connector. 4. Measure the resistance between terminals A and B using an ohmmeter. OCV coil resistance 6.9—7.5 ohms [20°C {68°F}] If not as ...

Receiver/Drier Removal/Installation
1. Disconnect the negative battery cable.. 2. Discharge the refrigerant.. 3. Remove the front under cover No.1.. 4. Drain the engine coolant.. 5. Remove the following parts: a. Plug hole plate. b. Air cleaner, air hose and fresh air duct component. c. Coolant reserve tank. d. Cooling ...

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