Mazda CX-5 Service & Repair Manual: Oil Control Valve (OCV)

Mazda CX-5 Service & Repair Manual / Engine / Lubrication / Oil Control Valve (OCV)

Purpose, Function

The OCV switches the oil passage to the hydraulic variable valve timing actuator to control the opening/closing period of the exhaust valve.

Construction

The OCV is installed to the exhaust camshaft cap (No.1).

The OCV consists of a spool valve which switches the engine oil passage and a plunger, coil, and return spring which operate the spool valve.

Operation

At retard

The spool valve is moved to the retard side by the signal from the PCM and engine oil is lead to the retard oil passage of the exhaust camshaft.

At advance

The spool valve is moved to the advance side by the signal from the PCM and engine oil is lead to the advance oil passage of the exhaust camshaft.

Middle point maintenance

The spool valve is moved to the closed position of the oil passage to the exhaust camshaft by the signal from the PCM.
The construction is designed to supply a small amount of oil to the advance oil passage even while the middle point is maintained, improving holding stability while at low oil pressure.

Fail-safe


DTC	Fail-safe
P0014:00	Performs the exhaust variable valve timing control with a maximum cam retard request.
P0015:00	Performs the exhaust variable valve timing control with a maximum cam retard request.
P2090:00	Performs the exhaust variable valve timing control with a maximum cam retard request.
P2091:00	Performs the exhaust variable valve timing control with a maximum cam retard request.

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