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SEN04119-01
Failure code [CA144] Coolant temp. sensor high error
User code
Failure code
E15
Contents of
• High voltage was detected in coolant temperature sensor circuit.
trouble
Action of
• Fixes coolant temperature (90°C) and continues operation.
controller
Problem that
appears on
machine
• Signal voltage of coolant temperature sensor can be checked with monitoring function.
Related
(Code: 04105 Engine coolant temperature sensor voltage)
information
• Method of reproducing failure code: Turn starting switch ON.
Defective coolant tempera-
1
ture sensor
(Internal trouble)
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
28
Trouble
CA144
Cause
Coolant temp. sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
TWTR (male)
Coolant temperature
Between (A) – (B)
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)
Wiring harness between ENG1 (female)
(49) – TWTR (female) (B)
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
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
ENG1 (female)
Coolant temperature
Between (47) – (49)
40 Troubleshooting
Resistance
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
700 – 800 z
95°C
Resis-
tance
Resis-
tance
Resis-
tance
Resistance
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
700 – 800 z
95°C
1
Max. 1 z
Max. 1 z
Min. 1 Mz
PC130-8
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Table of Contents
Troubleshooting
