SEN04119-01 40 Troubleshooting
28 PC130-8
Failure code [CA144] Coolant temp. sensor high error 1
User code Failure code
Trouble
Coolant temp. sensor high error
(Engine controller system)
E15 CA144
Contents of
trouble
• High voltage was detected in coolant temperature sensor circuit.
Action of
controller
• Fixes coolant temperature (90°C) and continues operation.
Problem that
appears on
machine
Related
information
• Signal voltage of coolant temperature sensor can be checked with monitoring function.
(Code: 04105 Engine coolant temperature sensor voltage)
• Method of reproducing failure code: Turn starting switch ON.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective coolant tempera-
ture sensor
(Internal trouble)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
TWTR (male) Coolant temperature Resistance
Between (A) – (B)
0°C 30 – 37 kz
25°C 9.3 – 10.7 kz
50°C 3.2 – 3.8 kz
80°C 1.0 – 1.3 kz
95°C 700 – 800 z
2
Disconnection in wiring har-
ness
(Disconnection in wiring or
defective contact in connec-
tor)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between ENG1 (female)
(47) – TWTR (female) (A)
Resis-
tance
Max. 1 z
Wiring harness between ENG1 (female)
(49) – TWTR (female) (B)
Resis-
tance
Max. 1 z
3
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between ENG1 (female)
(49) – TWTR (female) (B) and chassis
ground
Resis-
tance
Min. 1 Mz
4 Defective engine controller
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
ENG1 (female) Coolant temperature Resistance
Between (47) – (49)
0°C 30 – 37 kz
25°C 9.3 – 10.7 kz
50°C 3.2 – 3.8 kz
80°C 1.0 – 1.3 kz
95°C 700 – 800 z
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