Camshaft Timing Control

To improve the torque characteristics of the engine, the intake camshafts are "advanced" depending on engine speed and load.

The LH control module operates the camshaft timing adjuster solenoids (one per camshaft). When the solenoids are energized, the camshafts advance. In "P" or "N" the adjustment is dependent on engine RPM only.

Engine speed: Adjustment:
Up to 2000 RPM Retarded
From 2000 - 4700 RPM Advanced
From 4700 RPM Retarded
up to 2500 RPM Retarded
Selector in "P" or "N"
from 2500 RPM Advanced