Failure Code [Ca144] Coolant Temp Sens High Error - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [CA144] Coolant Temp Sens High Error

Action code Failure code
E15 CA144
Contents of
• High temperature error occurred in coolant temperature sensor circuit.
trouble
Action of
• Fixes coolant temperature value (90°C) and continues operation.
controller
Problem that
appears on • Starting performance of the engine lowers during low temperature.
machine
• The signal voltage of coolant temperature sensor can be checked in monitoring function.
Related
(Code: 04105 Coolant temperature sensor voltage)
information
• Duplication of failure code: turn ON the starting switch.
Defective coolant tempera-
1 ture sensor
(Internal defect)
Disconnection in wiring har-
ness
2 (Disconnection in wiring or
Possible causes
defective contact in connec-
and standard
tor)
value in normal
state
Ground fault in wiring har-
ness
3
(Short circuit with GND cir-
cuit)
4 Defective engine controller
32
Coolant Temp Sens High Error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
TWTR (male)
Between (A) – (B)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (15) –
TWTR (female) (A)
Wiring harness between ENG (female) (38) –
TWTR (female) (B)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Between wiring harness of ENG (female) (15) –
TWTR (female) (A) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
ENG (female)
Between (15) – (38)
40 Troubleshooting
Coolant temperature
10 – 100°C
Resis-
tance
Resis-
tance
Resis-
tance
Coolant temperature
10 – 100°C
Resistance
0.6 – 20 kz
Max. 1 z
Max. 1 z
Min. 1 Mz
Resistance
0.6 – 20 kz
PC800, 850-8