Komatsu ecot3 PC300-8, Shop Manual

Page: 570 / 1035

SEN02629-03 40 Troubleshooting
32
PC300, 350-8
Failure code [CA153] Chg Air Temp Sensor High Error 1
Action code Failure code
Trouble Abnormally high level in charge temperature
E15 CA153
Contents of
trouble
• High voltage is detected in temperature signal circuit of boost pressure sensor and temperature sen-
sor.
Action of con-
troller
• Fixes charge temperature (46°C) and continues operation.
Problem that
appears on
machine
• Exhaust smoke is white
• Boost temperature-based engine protection function does not function.
Related infor-
mation
• Method of reproducing failure code: Starting switch ON.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective [temperature sig-
nal circuit] of boost pressure
sensor, temperature sensor
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
C4 (male) Charge temperature Resistance
Between (3) – (4)
0°C 5.5 – 6.1 k
z
25°C 1.9 – 2.1 k
z
40°C 1.1 – 1.2 k
z
100°C 180 – 185
z
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CE01 (female) (23)
– C4 (female) (3) Resis-
tance
Max. 10
z
Wiring harness between CE01 (female) (47)
– C4 (female) (4) Resis-
tance
Max. 10
z
3
Short circuit in wiring har-
ness (With another wiring
harness)
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between
CE01 (female) (23) – CE01 (female) (With all
connectors of wiring harness disconnected)
Resis-
tance
Min.
100 k
z
4
Defective wiring harness
connector
Connecting parts among boost pressure sensor, temperature sen-
sor, engine wiring harness, and engine controller are suspected.
Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
5 Defective engine controller
a
Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
CE01 (female) Charge temperature Resistance
Between (23) – (47)
0°C 5.5 – 6.1 k
z
25°C 1.9 – 2.1 k
z
40°C 1.1 – 1.2 k
z
100°C 180 – 185
z