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Home >> Acura >> 2009 >> CSX Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 80 (Fuel And Emissions Systems) >> System Description >> VTEC System Operation (J37A4 engine) >> At low engine speed

At low engine speed

WARNING: This page is about a different car, the 2010 Acura TL and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: VTEC System Operation Diagram - Low Engine Speed (J37A4 Engine)
G06679469Courtesy of AMERICAN HONDA MOTOR CO., INC.
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