Hydraulic Oil Temperature Gauge Does Not Indicate Properly - Komatsu PC200-8M0 Shop Manual

400 Troubleshooting of electrical system (E-mode)
E-9 Hydraulic oil temperature gauge does not indicate properly
E-9 Hydraulic oil temperature gauge does not indicate properly
1) While hydraulic oil temperature is rising properdy, temperature gauge does not rise from white
Failure range (C).
2) While hydraulic oil temperature is stabilized properly, temperature gauge rises to red range (H).
q
Signal of hydraulic oil temperature sensor is input to pump controller and then the data is transmit-
Related infor- ted to machine monitor through CAN communication system.
q
mation Hydraulic oil temperature can be checked with monitoring function
(Code: 04401 Hydraulic oil temperature)
Cause
Defective hydraulic oil tem-
perature sensor
1
(internal open or short cir-
cuit)
Open circuit or ground fault
2
in wiring harness
Open circuit in wiring har-
ness
3
(wire breakage or defective
contact of connector)
Ground fault in wiring har-
4 ness
(contact with ground circuit)
Hot short circuit in wiring har-
5 ness
(contact with 24 V circuit)
6 Defective pump controller
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector P22 and connect T-adapters to male side.
Between P22 (male) (1) and (2)
a Temperature characteristics of oil
temperature sensor
Between P22 (male) (2) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector C01 and connect T-adapters to female side.
Between C01 (female) (29) and (46)
a Resistance accords with temperature characteristics
table in cause 1.
Between C01 (female) (29) and ground
a If no failure is found in checks on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P22, and connect T-adapters to each female
side.
Between C01 (female) (29) and P22 (female) (2)
Between C01 (female) (46) and P22 (female) (1)
a If no failure is found in checks on cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C01 and P22, and connect T-adapters to either female
side.
Between C01 (female) (29) and ground, or between
P22 (female) (2) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector P22.
3. Insert T-adapters into connector C01 or connect T-adapters to female side of
connector P22.
4. Turn starting switch to ON position.
Between C01 (29) and ground, or between P22
(female) (2) and ground
If no failure is found by above checks, the pump controller is defective. (Since this is
an internal defect, troubleshooting cannot be performed.)
SEN06138-00
10°C Resistance
30°C Resistance
80°C Resistance
100°C Resistance
Resistance
Resistance 3.5 to 90 kz
Resistance
Resistance
Resistance
Resistance
Voltage Approx. 5 V
Approx.
90 kz
Approx.
35 kz
Approx.
6.5 kz
Approx.
3.5 kz
Min. 1 Mz
Min. 1 Mz
Max. 1 z
Max. 1 z
Min. 1 Mz
27
40-400