Komatsu 170-3 Series Shop Manual page 180

TROUBLESHOOTING
ACTION TAKEN BY CONTROLLER AND CONDITION OF
MACHINE WHEN ERROR CODE IS DISPLAYED
User
System with abnormality
code
Abnormality in controller
111
memory
Abnormality in timing rail
112
actuator
Abnormality with electric
113 current in timing rail
actuator system
Abnormality in engine
115
speed sensor 2 system
Abnormality in timing rail
116 pressure sensor system
high level
Abnormality in timing rail
117 pressure sensor system
low level
Abnormality in fuel pump
118 pressure sensor system
high level
Abnormality in fuel pump
119 pressure sensor system
low level
Abnormality in engine
121
speed sensor 1 system
Abnormality in boost
122 pressure sensor system
high level
Abnormality in boost
123 pressure sensor system
low level
12-210
ACTION TAKEN BY CONTROLLER AND CONDITION OF
Nature of abnormality
Failure of memory hardware inside control-
ler or communications failure in internal
processor
• Abnormality in timing rail Excessive differ-
ence between timing rail command fuel
value and actual timing fuel
Judgment value (reference):
Difference more than 400 mm
3
than –750 mm /st (when coolant tem-
perature is 0°C or above)
• Abnormality has occurred in timing rail
actuator circuit
Between ECMA (1) and (20) (reference
value):
Detected outside range of 0.40±0.35A
(engine stopped)
• No signal is input from engine speed sen-
sor circuit system 2
ECMA (27), (28): Signal 1
ECMA (37), (38): Signal 2
• Abnormality has occurred in timing rail
pressure sensor circuit
ECMA (33): 4.78 V or more detected
• Abnormality has occurred in timing rail
pressure sensor circuit
ECMA (33): 0.30 V or less detected
• Abnormality has occurred in fuel pump
pressure sensor circuit
ECMA (32): 4.78 V or more detected
• Abnormality has occurred in fuel pump
pressure sensor circuit
ECMA (32): 0.30 V or less detected
• 15. No signal is input from engine speed
sensor circuit system 2 to one of following
ECMA (27), (28): Signal 1
ECMA (37), (38): Signal 2
• Abnormality has occurred in boost pres-
sure sensor circuit
ECMA (35): 4.72 V or more detected
• Abnormality has occurred in boost pres-
sure sensor circuit
ECMA (35): 0.30 V or less detected
MACHINE WHEN ERROR CODE IS DISPLAYED
Condition when normal
3
/st or less
• Resistance of timing rail actuator
Between TIMG (A) and (C): 7 – 9 Ω
• Resistance of engine speed sensor
Between SP2 (A) and (B) (signal 1):1 – 2 kΩ
Between SP1 (A) and (B) (signal 2):1 – 2 kΩ
• Voltage of timing rail pressure sensor
Between ECMA (5) and (18) (power source):
Between ECMA (33) and (18) (signal):
• Voltage of timing rail pressure sensor
Between ECMA (5) and (18) (power source):
Between ECMA (33) and (18) (signal):
• Voltage of fuel pump pressure sensor
Between ECMA (5) and (18) (power source):
Between ECMA (32) and (18) (signal):
• Voltage of fuel pump pressure sensor
Between ECMA (5) and (18) (power source):
Between ECMA (32) and (18) (signal):
• Resistance of engine speed sensor
Between SP2 (A) and (B) (signal 1): 1 – 2 kΩ
Between SP1 (A) and (B) (signal 2): 1 – 2 kΩ
• Voltage of boost pressure sensor
Between ECMA (6) and (17) (power source):
Between ECMA (35) and (17) (signal):
• Voltage of boost pressure sensor
Between ECMA (6) and (17) (power source):
Between ECMA (35) and (17) (signal):
—
—
4.75 – 5.25 V
0.42 – 0.58 V
(engine stopped)
4.75 – 5.25 V
0.42 – 0.58 V
(engine stopped)
4.75 – 5.25 V
0.42 – 0.58 V
(engine stopped)
4.75 – 5.25 V
0.42 – 0.58 V
(engine stopped)
4.75 – 5.25 V
0.42 – 0.58 V
(engine stopped)
4.75 – 5.25 V
0.42 – 0.58 V
(engine stopped)
170-3 SERIES