Mazda CX-5 Service & Repair Manual: Electric Variable Valve Timing Actuator
Purpose, Function
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The electric variable valve timing actuator changes the phases of the intake camshaft relative to the crankshaft. As a result, the open/close period of the intake valve is changed, optimized valve timing in accordance with driving conditions is realized, output is improved, and emission reduction is realized.
Construction
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The electric variable valve timing actuator is installed to the intake camshaft.
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The electric variable valve timing actuator consists of the following parts:
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The sprocket gear rotates together with the intake camshaft sprocket.
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The camshaft gear rotates together with the intake camshaft.
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The eccentric shaft is an eccentric shape relative to the rotation axis of the intake camshaft.
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The planetary gear is engaged with the eccentric shaft. In addition, the planetary gear is engaged with the sprocket gear and the camshaft gear.
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The number of teeth for the planetary gear (large) is one tooth fewer than the number of teeth for the sprocket gear.
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The number of teeth for the planetary gear (small) is one tooth fewer than the number of teeth for the camshaft gear.
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The planetary gear rotates by receiving the rotation force from the eccentric shaft.
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The camshaft gear rotates by receiving the rotation force from the planetary gear.
Operation
Advancing valve timing
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The electric variable valve timing motor rotation speed is faster than the intake camshaft sprocket rotation speed. As a result, the camshaft gear rotates in the advance direction relative to the intake camshaft sprocket, and the valve timing is advanced.
Retarding valve timing
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The electric variable valve timing motor rotation speed is slower than the intake camshaft sprocket rotation speed. As a result, the camshaft gear rotates in the retard direction relative to the intake camshaft sprocket, and the valve timing is retarded. (If engine rotation speed is slow, the electric variable valve timing motor may be rotating in reverse and the camshaft gear may be rotating in the retard direction.)
Maintaining intermediate valve timing
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The electric variable valve timing motor rotation speed is the same as the intake camshaft sprocket rotation speed. As a result, the phase difference of the camshaft gear relative to the intake camshaft sprocket is maintained, the camshaft gear rotation speed is the same as the intake camshaft sprocket rotation speed, and the valve timing is maintained.
Fail-safe
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DTC |
Fail-safe |
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P0011:00 |
|
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P0012:00 |
|
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P1380:00 |
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Electric Variable Valve Timing Actuator Inspection
WARNING:
A hot engine can cause severe burns. Turn off the engine and wait until it
is cool before servicing.
CAUTION:
Do not disassemble the electric variable valve timing ac ...
Electric Variable Valve Timing Actuator, Hydraulic Variable Valve Timing Actuator
Removal/Installation
WARNING:
A hot engine can cause severe burns. Turn off the engine and wait until it
is cool before servicing.
CAUTION:
Do not disassemble the electric variable valve timing ac ...
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Purpose
The auto light sensor detects the illumination level above and in front of
the vehicle and outputs it to the front body control module (FBCM).
Function
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Clutch Pedal Inspection [C66 M R]
NOTE:
For the clutch pedal inspection, note the following and measure each inspection
location.
Measure the center of the upper surface of the pedal pad for each inspection.
If the distance from the pedal pad to the floor covering is measured,
measure the short ...
Add-On Non-Genuine Parts and Accessories
Non-genuine parts and accessories for Mazda vehicles can be found in stores.
These may fit your vehicle, but they are not approved by Mazda for use with Mazda
vehicles. When you install non-genuine parts or accessories, they could affect your
vehicle's performance or safety systems; the Maz ...
