Isuzu 4HL1 Workshop Manual page 93

Chart 2 (1/2)
DTC Fault
14 CMP Sensor System Fault
15 CKP Sensor System Fault
18 Starter degradation
(VIM) (MT vehicles)
22 IAT Sensor System Fault
23 ECT Sensor System Fault
24 Accelerator Sensor System Fault
25 Vehicle Speed Sensor System
(VIM) Fault
28 PTO Accelerator Sensor System
(VIM) Fault
31
Idle Up Volume System Fault
(VIM)
33 VIM Internal Fault
(VIM) (EEPROM Write Error)
ECM Internal Fault
34
(Charge Circuit Fault)
35 VIM Internal Fault
(VIM) (A/D Conversion Fault)
43 ITP Sensor System Fault
EGR Valve Position Sensor
44
System Fault
45 EGR Valve System Fault
Exhaust Brake System Fault
(ON circuit open wiring)
46
(VIM)
Exhaust Brake System Fault
(OFF circuit open wiring)
ECM Internal Fault (CPU Error)
51
ECM Internal Fault
(CPU History Error)
ECM Internal Fault
52
(Sub CPU Error)
Intake Throttle Valve System
61
Fault
71 Barometric Pressure Sensor
(VIM) Fault
81
Clutch Switch System Fault
(VIM)
82
Neutral Switch System Fault
(VIM)
CAN Communication Fault
84
(CAN Bus Error)
CAN Communication Fault
86
(CAN Timeout Error)
Common Rail Pressure Sensor
115
Fixed Output Fault
Common Rail Pressure Fault
(First Stage in Control System)
118
Common Rail Pressure Fault
(Second Stage in Control
System)
Injector Power Supply System
158
Short (Common 1)
Injector Power Supply System
159
Short (Common 2)
Major faulty event
Poor startability
Poor startability
Poor driveability
Poor startability
Poor driveability
Poor startability under cold
weather conditions
Poor driveability
Prolonged warm-up time
Short power
Poor pedal response
Poor driveability
Improper speedometer indication
Poor driveability
Poor driveability
Poor driveability
—
Generation of black smoke
Short power
Poor driveability
Generation of white/black smoke
Inactive idle up volume system
Inactive PTO accelerator sensor
system
Generation of black smoke
Short power
Poor driveability
Extensive suction noise during
acceleration or exhaust braking
Generation of black smoke
Short power
Poor driveability
Generation of black smoke
Short power
Poor driveability
Inactive exhaust brake system,
PTO and QWS
Inactive ABS/ASR
Engine stop
Poor driveability
Generation of black smoke
Short power
Poor driveability
Generation of black smoke
Inactive exhaust brake, QWS, and
PTO
Generation of black smoke
Poor driveability
Inactive exhaust brake and QWS
Poor driveability
Terminated VIM control
(e.g., tachometer or PTO)
Poor driveability
Terminated VIM control
(e.g., tachometer or PTO)
Poor startability
Generation of while/black smoke
Short power
Poor driveability
Poor startability
Generation of while/black smoke
Short power
Poor driveability
Short power
Poor driveability
Short power
Poor driveability
Parts to be inspected
Wire harnesses and connectors (G sensor
system), G sensor, ECM
Wire harnesses and connectors (NE sensor
system), NE sensor, ECM
Starter
Wire harnesses and connectors (IAT sensor
system), IAT sensor, ECM
Wire harnesses and connectors (ECT sensor
system), ECT sensor, ECM
Wire harnesses and connectors (AP sensor
system), AP sensor, ECM
Wire harnesses and connectors (VS sensor
system), VS sensor, ECM
Wire harnesses and connectors (PTO accelerator
sensor system), PTO accelerator sensor, ECM
Wire harnesses and connectors (idle up volume
system), idle up volume, ECM
VIM
ECM
VIM
Wire harnesses and connectors (ITP sensor
system), ITP accelerator sensor, ECM
Wire harnesses and connectors (EGR valve
position sensor system), EGR valve position
sensor, ECM
Wire harnesses and connectors (EGR valve and
EGR DC motor system), EGR valve, main relay,
EGR DC motor, ECM
Wire harnesses and connectors (exhaust brake
solenoid valve system), exhaust brake solenoid
valve, ECM
ECM
ECM
Wire harnesses and connectors (intake throttle
valve system), intake throttle valve, main relay,
intake throttle DC motor, ECM
VIM
Wire harnesses and connectors (clutch switch
system), clutch switch, ECM
Wire harnesses and connectors (neutral switch
system), neutral switch, ECM
ECM
VIM
Wire harnesses and connectors (common rail
pressure sensor system), common rail pressure
sensor, ECM
Wire harnesses and connectors (common rail
pressure sensor system), common rail pressure
sensor, SCV, flow damper, fuel pipe, 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
Engine Control System 1A-91
Applicable Tech 2 parameter
Engine Speed
Engine Speed
Engine Start Counts
Intake Air Temperature, IAT
Sensor
Coolant Temperature, ECT
Sensor
Final Accelerator Opening,
Acceleraator Sensor
Vehicle Speed
PTO Accelerator Opening, PTO
Accelerator Sensor
Engine Speed, Idle Up Volume
Engine Start Counts
System Voltage
Actual Intake Throttle Position,
Desired Intake Throttle Position,
Intake Throttle Valve, Intake
Throttle Duty Ratio
EGR Valve Position Sensor, EGR
Duty Cycle
EGR Valve Position Sensor, EGR
Duty Cycle
Exhaust Brake Valve 1
DTC
All data list
Actual Intake Throttle Position,
Desired Intake Throttle Position,
Intake Throttle Valve, Intake
Throttle Duty Ratio
Barometric Pressure, Barometric
Pressure Sensor
Clutch Switch
Neutral Switch
Vehicle Speed
Vehicle Speed
Actual Rail Pressure, Common
Rail Pressure Sensor
Actual Rail Pressure, SCV Duty
Ratio, SCV Current
Cylinder 1/4 Compensation
Cylinder 2/3 Compensation
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