Honda Accord 2008 Manual page 362

07/11/02 09:01:20 61TA0000_110_0043
Exhaust valve side (PZEV model)
At idle and low engine speed, rocker arm oil control solenoid B is turned off by the PCM. Oil pressure from the rocker
arm oil control valve does not enter the exhaust rocker shaft. Each exhaust rocker arm is separated by a return spring,
and lifted by a timing cam lobe. The exhaust primary rocker arm is moved by the normal lift cam lobe (valve active),
and the exhaust secondary rocker arm is moved by the no lift cam lobe (valve pause).
＊３６
When the engine speed reaches 2,500 rpm or more, rocker arm oil control solenoid B is turned on by the PCM. Oil
pressure from the rocker arm oil control solenoid enters into the primary exhaust rocker arm via the exhaust rocker
shaft, and it moves the VTEC switching piston in the rocker arm. This causes the VTEC switching piston to slide into
the exhaust secondary rocker arm, locking the exhaust rocker arms together. Both exhaust rocker arms are moved by
the normal lift cam lobe (valve active).
＊３７
NO LIFT CAM LOBE
(VALVE PAUSE)
NORMAL LIFT CAM LOBE
EXHAUST
ROCKER SHAFT
RETURN
SPRING
EXHAUST SECONDARY VTEC SWITCHING
ROCKER ARM PISTON
NORMAL LIFT CAM LOBE
EXHAUST
ROCKER SHAFT
EXHAUST SECONDARY VTEC SWITCHING
ROCKER ARM PISTON
ROCKER ARM PCM
OIL CONTROL
SOLENOID B
EXHAUST
PRIMARY
ROCKER ARM
From
OIL PUMP
ROCKER ARM
PCM
OIL CONTROL
SOLENOID B
EXHAUST
PRIMARY
ROCKER ARM
From
OIL PUMP
VALVE
VALVE
(cont'd)
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