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 units operate the camshaft timing adjuster solenoids (one per camshaft). When the solenoids (Y49/1 and Y49/2) 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 - 4400 RPM Advanced
From 4400 RPM Retarded
Above 250 km/h (155 mph) Advanced
Selector in "P" or "N"
up to 2500 RPM Retarded
Selector in "P" or "N"
from 2500 RPM Advanced