THEORY OF OPERATION - CONTINUED
FUEL SYSTEM - CONTINUED
(a) ECU sends a signal to timing solenoid valve.
(b) Timing solenoid valve triggers timing mechanism.
(c) Timing solenoid valve changes pressure in timing mechanism.
(d) Timing mechanism changes position of cam ring.
(e) Cam ring changes position of rollers.
(f) Rollers change position of cam plate.
(g) Cam plate changes timing of fuel delivery.
Shutoff. Engine shuts off by interrupting fuel supply. Engine electronic control module (ECM) specifies amount of
fuel. Fuel solenoid valve is switched by define to zero.
Control. Injection pump ECU uses command from ECM and measured values from speed/timing sensor to actuate
fuel solenoid valve.