Failure Code [Ca144] Coolant Temp Sens High Error - Komatsu PC210-8 Shop Manual

UEN00240-01

Failure code [CA144] Coolant Temp Sens High Error

User code Failure code
E15
Contents of
• Signal circuit of coolant temperature sensor detected high voltage.
trouble
Action of
• Fixes coolant temperature value and continues operation.
controller
Problem that
• Exhaust gas becomes white.
appears on
• Overheat prevention function does not work.
machine
• Signal voltage of coolant temperature sensor can be checked with monitoring function. (Code: 04105
Related infor-
Coolant temperature sensor voltage)
mation
• Method of reproducing failure code: Turn starting switch ON.
Defective coolant tempera-
1
ture sensor
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
Short circuit in wiring har-
value in normal
3 ness (with another wiring
state
harness)
Defective wiring harness
4
connector
5 Defective engine controller
32
Trouble
CA144
Cause
Coolant temperature sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
COOLANT TEMP (male)
Between (A) – (B)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CE01 (female) (15)
– COOLANT TEMP (female) (B)
Wiring harness between CE01 (female) (38)
– JC03 – COOLANT TEMP (female) (A)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CE01 (female) (15)
– each of CE01 (female) pins (With all wiring
harness connectors disconnected)
Connecting parts between coolant temperature sensor – engine wir-
ing harness – engine controller may be defective. Check them
directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
CE01 (female)
Between (15) – (38)
40 Troubleshooting
1
Resistance
0.18 – 160 kz
Resis-
Max. 10 z
tance
Resis-
Max. 10 z
tance
Resis- Min. 100
tance kz
Resistance
0.18 – 160 kz
PC210, 230, 240-8