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At low engine speed

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The rocker arm oil control solenoid is turned off by the PCM. Oil pressure from the rocker arm oil control valve does not enter the rocker shaft. The intake primary and secondary rocker arms are separated by a return spring and lifted by the low lift cam lobe.

Fig 1: Identifying Low Engine Speed Rocker Arm Oil Solenoid & System Diagram
G00511979Courtesy of AMERICAN HONDA MOTOR CO., INC.
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