Isuzu 4HL1 Workshop Manual page 94

1A-92 Engine Control System
Chart 2 (2/2)
DTC Fault
Fuel Temperature Sensor
211
System Fault
217 SCV Drive System Short
No Pump Pressure Feed (Fuel
227
Leak)
Idle Position Switch Circuit Open
241
Wiring
242 Idle Position Switch Circuit Short
Common Rail Pressure Sensor
245
System Fault
247 SCV Drive System Fault
Cylinder 1
271
(Injector Drive System) Fault
Cylinder 2
272
(Injector Drive System) Fault
Cylinder 3
273
(Injector Drive System) Fault
Cylinder 4
274
(Injector Drive System) Fault
Injector Power Supply System
277
Open Wiring (Common 1)
Injector Power Supply System
278
Open Wiring (Common 2)
416 Main Relay System Fault
417 Starter Switch System Fault
543 High Engine Speed Error
Major faulty event
Poor driveability
Poor startability
Generation of white/black smoke
Short power
Poor drivability
Generation of white/black smoke
Short power
Poor driveability
Engine stop
Short power
Poor driveability
(When the AP sensor is also
faulty.)
Short power
Poor pedal response
Poor driveability
(When the AP sensor is also
faulty.)
Poor startability
Generation of white/black smoke
Short power
Poor driveability
Poor startability
Generation of white/black smoke
Short power
Poor driveability
Short power
Poor driveability
Short power
Poor driveability
Short power
Poor driveability
Short power
Poor driveability
Engine stop
No startability
Engine stop
No startability
Battery over-discharge
Starter malfunction
No pedal response
Parts to be inspected
Wire harnesses and connectors (FT sensor
system), FT sensor, ECM
Wire harnesses and connectors (SCV+ to ECM),
SCV, ECM
SCV, flow damper, common rail, supply pump,
injector, fuel pipe, ECM
Wire harnesses and connectors (idle position
switch system), idle position switch, ECM
Wire harnesses and connectors (idle position
switch system), idle position switch, ECM
Wire harnesses and connectors (common rail
pressure sensor system), common rail pressure
sensor, ECM
Wire harnesses and connectors (SCV drive
system), SCV, ECM
Wire harnesses and connectors (injector #1 to
ECM injector #1 pin), injector #1, ECM
Wire harnesses and connectors (injector #4 to
ECM injector #4 pin), injector #4, ECM
Wire harnesses and connectors (injector #2 to
ECM injector #2 pin), injector #2, ECM
Wire harnesses and connectors (injector #3 to
ECM injector #3 pin), injector #3, ECM
Wire harnesses and connectors (injector #1/3 to
ECM common 1 pin), injectors #1 and #3, ECM
Wire harnesses and connectors (injector #2/4 to
ECM common 2 pin), injectors #2 and #4, ECM
Wire harnesses and connectors (main relay
system), main relay, ECM
Wire harnesses and connectors (starter switch
system), starter switch, ECM
Shift position, transmission, NE and G sensor
signals
Applicable Tech 2 parameter
Fuel Temperature, FT Sensor
Actual Rail Pressure, SCV Duty
Cycle
Actual Rail Pressure, SCV Duty
Cycle
Idle Position Switch
Idle Position Switch
Actual Rail Pressure, Common
Rail Pressure Sensor
SCV Duty Ratio, SCV Current
Cylinder 1 Compensation
Cylinder 2 Compensation
Cylinder 3 Compensation
Cylinder 4 Compensation
Cylinder 1/4 Compensation
Cylinder 2/3 Compensation
System Voltage
Starter Switch
Engine Speed