Hydraulic Oil Temperature Gauge Does Not Indicate Normally - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02632-02
E-12 Hydraulic oil temperature gauge does not indicate normally
• While hydraulic oil temperature is rising normally, temperature gauge does not rise from white range
Trouble (C).
• While hydraulic oil temperature is stabilized normally, temperature gauge rises to red range (H).
Related infor- • Input from the hydraulic oil temperature sensor (temperature) can be checked with monitoring func-
mation tion. (Code 04402: Hydraulic oil temperature)
Defective hydraulic oil tem-
perature sensor
1
(Internal disconnection or
short circuit)
Disconnection in wiring har-
ness
2 (Disconnection in wiring or
defective contact in connec-
tor)
Possible causes
and standard
Ground fault in wiring har-
value in normal
ness
state
3
(Short circuit with GND cir-
cuit)
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective pump controller
Circuit diagram related to hydraulic oil temperature sensor
26
Cause Standard value in normal state/Remarks on troubleshooting
a
Between (1) – (2)
Between (2) – chas-
a
Wiring harness between CP01 (female) (29)
– P22 (female) (2)
Wiring harness between CP01 (female) (46)
– P22 (female) (1)
a
Wiring harness between CP01 (female) (29)
– P22 (female) (2) and chassis ground
a
Wiring harness between CP01 (female) (29)
– P22 (female) (2) and chassis ground
a
Between (29) – (46)
Between (29) –
chassis ground
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Engine coolant tem-
P22 (male)
perature
10 – 100°C
sis ground
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Engine coolant tem-
CP01
perature
10 – 100°C
40 Troubleshooting
1
Resistance
90 – 3.5 kz
Min. 1 Mz
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Voltage Max. 1 V
Resistance
90 – 3.5 kz
Min. 1 Mz
PC300, 350-8