Isuzu 4HL1 Workshop Manual page 6

1A-4 Engine Control System
Engine Control System
Accelerator
AP sensor
Idle position switch
Switch
A/C switch
Relay/Lamp
Starter cut relay
Glow relay
Check engine lamp
Common rail
Injector
EGR cooler
Exhaust
pipe
The engine control system comprehends vehicle status
and driver's intention based on the data acquired from
sensors and switches to adapt the engine to changing
situation so that the vehicle will achieve optimal running
condition. The heart of the engine control system is
ECM and this device provides direct control tasks for
the engine system, including fuel injection control,
intake throttle control, EGR control, and QWS control.
The ECM also governs vehicle system control
strategies such as exhaust brake control and idle stop
control via VIM. In addition, the ECM communicates
with other key systems, including ABS/ASR system
and clutch free system, via VIM.
ECM
(Engine Control Module)
Common rail
pressure sensor
SCV
Supply
pump
FT sensor
EGR valve drive
EGR valve position sensor
CMP sensor
ITP sensor
Intake throttle drive
ECT
CKP
CAN
Starter
Ignition switch
Starter switch
Battery
Outer diagnostic unit
Diagnostic switch
Main relay
Battery +
IAT sensor
Exhaust brake
solenoid valve
Atomospheric
pressure sensor
VIM
(Vehicle Interface Module)
Vehicle functions
Tachometer
TCM
ABS/ASR ECU
ISS ECU
Relay
ECO Relay,
Exhaust Brake
Lamp
Exhaust Brake Lamp
Glow Lamp
Brake
Stop Lamp Relay
Exhaust Brake Lamp
Transmission
Clutch Switch
Neutral Switch (MT)
Parking
/Neutral (AT)
Switch
Vehicle Speed Sensor
Power Take OFF (PTO)
PTO Switch (ACTIVE HIGH)
PTO Switch (ACTIVE LOW)
PTO Accelerator Sensor
Quick Warm Up System
QWS Switch
Idle
Idle Up Volume
Others
Freezer Switch
Clean Starting Memory
LNW21ALF004601-X