Isuzu 4HL1, Workshop Manual

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Engine Control System 1A-251
Symptom Diagnosis Chart 1 (1/2)
LNW21AXF002401-X
Cooling
system
Glow relay
Glow plug
IAT sensor
Intake throttle system
Intake pipe, air cleaner
Engine
Warm-up
system
Intake system
Control system
Revolution control
system
Fuel system
ECM
C-9
VIM
C-9
System voltage /Battery C-1
Atmospheric pressure sensor
C-7
SCV C-2
Pump assembly
D-10
FT sensor A-2
Common rail pressure sensor
A-1
Common rail / flow damper /
pressure limiter
D-14
Injector
C-3
Fuel filter / pipe / tank D-4
Fuel
D-12
Valve clearance D-1
Valve timing D-11
Compression D-2
Ring gear D-6
Rotary parts
D-10
CKP sensor
D-8
CMP sensor
D-8
Mechanical timing
D-9
Pump mount condition D-9
ECT sensor
A-2
B-7
D-3
A-2
C-4
D-5
White smoke Large engine vibration Black smoke
Faulty idling
Easy engine
stall
Short power / poor response / stumble Low idle speed Hunting / instable idling High idle speed Stall before warm-up Stall after warm-up Unusual sound No cranking No initial combustion
Poor startability
Poor startability at ordinary temperature Poor startability at low temperature
Symptom
Check item