Isuzu 4JB1 User Manual

00 – 6 SERVICE INF
ORMATION
GLOW PLUGS ARE NOT RECEIVING POWER (Cont’d)
Checkpoint Possible cause Correction
Def
ective glow plug relay
The glow plug relay does not turn on after the
starter switch is moved from the “OFF”
position to the “ON” position
Replace the glow plug relay
Defective quick-on start timer Replace the quick-on start timer
Defective glow plug relay wiring harness Repair or replace the wiring harness
G
low plug indicator
light turns on for 3.5
seconds
Defective fusible link or wiring harness
The glow plug relay turns on when the starter
switch is moved from the “OFF” position to
the “ON” position
Replace the fusible link or the wiring
harness
2.
UNSTABLE IDLING
Checkpoint Possible cause Correction
Idling s
ystem Idling improperly adjusted Adjust the idling
F
ast idling speed Defective fast idling speed control device Repair or replace the fast idling speed
control device
A
ccelerator control
system
Accelerator control system improperly
adjusted
Adjust the accelerator control system
F
uel system leakage or blockage Repair or replace the fuel system
Air
in the fuel system Bleed the air from the fuel system
F
uel system
Water particles in the fuel system Change the fuel
F
uel filter Clogged fuel filter element Replace the fuel filter element or the
fuel filter cartridge
F
uel feed pump Defective fuel feed pump Repair or replace the fuel feed pump
Inj
ection nozzle sticking Replace the injection nozzle
Inj
ection nozzle
Injection nozzle injection starting pressure
too low
Improper spray condition
Adjust or replace the injection nozzle
Inj
ection pump Defective delivery valve resulting in fuel
drippage after fuel injection
Replace the delivery valve

Isuzu 4JB1 Specifications

General

Brand	Isuzu
Model	4JB1
Category	Engine
Language	English