Service manual

G420F(FE) Service Manual Chapter 5. Engine Management System (EMS) 161
Dual Fuel System of G420FE (certified engine system)
INPUT OUTPUT
A dual fuel system operates on either LPG or
gasoline. The fuel type can be switched while the
engine is stopped or running at low speeds and low
loads. The fuel selection switch is a three-position
type where the center position is fuel off.
MPI (multi-point injection) system is used for
G420FE dual fuel engine and G420F gasoline/dual
fuel engine. On gasoline, the camshaft sensor along
with the crankshaft sensor is used to control the fuel
injectors and feedback from oxygen sensor is used
by the SECM to adjust the gasoline delivery based
on the exhaust emissions.
Crank Sensor Throttle body
CAM sensor
TMAP sensorv
Coolant Temp
EG oil pressure switchv
T/M Temp switch
Accel pedal angle sensor
Throttle position sensor
Pre Oxygen sensor
Post Oxygen sensor
LP fuel temp sensor
T/M Inching pressure
switch
SECM
4 Power TRs
4 Ignition coils
2 Fuel trim valves
LP fuelock valve
4 Injectors
Fuel Pump
CAN communication