Honda Accord 2008 Manual page 361

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Table of Contents

07/11/02 09:01:20 61TA0000_110_0042

Fuel and Emissions Systems

System Description (cont'd)

VTEC System Operation

Intake valve side

At low engine speed, the rocker arm oil control solenoid (rocker arm oil control solenoid A) is turned off by the ECM/

PCM. Oil pressure from the rocker arm oil control valve does not enter the intake rocker shaft. Each intake rocker arm

is separated by a return spring and lifted by each low lift cam lobe.

At high engine speed, the rocker arm oil control solenoid (rocker arm oil control solenoid A) is turned on by the ECM/

PCM. Oil pressure from the rocker arm control solenoid enters into the primary intake rocker arm via the intake rocker

shaft, and it moves the VTEC switching piston in the rocker arm.

This causes the VTEC switching piston to slide into the intake mid rocker arm and the intake secondary rocker arm,

locking the rocker arms together. Both intake rocker arms are lifted by the high lift cam lobe.

LOW LIFT CAM LOBE

ROCKER SHAFT

VTEC SWITCHING

INTAKE PRIMARY

INTAKE MID ROCKER ARM

HIGH LIFT CAM LOBE