L322 Range Rover System Description and Operation
ENGINE MANAGEMENT SYSTEM – V8
DESCRIPTION AND OPERATION 18-2-45
Camshafts
Each intake camshaft has two oil ports separated by three sealing rings on their forward ends.
The ports direct pressurized oil from the oil distribution flange to the inner workings of the VCC transmission.
Each camshaft has REVERSE threaded bores in their centres for the attachment of the timing chain sprockets on the
exhaust cams and the VCC transmissions for each intake camshaft as shown.
Camshaft Position Impulse Wheels:
The camshaft position impulse wheels provide camshaft position status to the engine control module via the camshaft
position sensors. The asymmetrical placement of the sensor wheel pulse plates provides the engine control module
with cylinder specific position ID in conjunction with crankshaft position.
V8 VCC Control
As the engine camshafts are rotated by the primary and secondary timing chains, the ECM activates the VCC
solenoids via a PWM (pulse width modulated) ground signal based on a program map. The program is influenced by
engine speed, load, and engine temperature.
In its inactive or default position, the valves direct 100% engine oil pressure flow to achieve maximum “retard ”VCC
positioning
Maximum Retard Position
M18 0811
