Failure Code [Dgh2Kb] Hyd Oil Sensor Short Circuit - Komatsu PC200-8M0 Shop Manual

SEN06135-00

Failure code [DGH2KB] Hyd Oil Sensor Short Circuit

Action
Failure code
level
L01 DGH2KB
q
Signal voltage of hydraulic oil temperature sensor circuit is below 1 V, so pump controller deter-
Detail of failure
mines that circuit shorts.
Action of con-
q If cause of failure disappears, machine becomes normal by itself.
troller
q
Problem on Regardless of the hydraulic oil temperature, hydraulic oil temperature gauge meter is equivalent to
machine 50 degrees.
q
Signal voltage from hydraulic oil temperature sensor can be checked with monitoring function.
Related infor-
(Code: 04402: Hydraulic oil temperature sensor voltage)
mation
q
Method of reproducing failure code: Start engine.
Cause
Defective hydraulic oil tempera-
1 ture sensor
(internal open or short circuit)
Open circuit or short circuit or
2 ground fault or hot short circuit in
wiring harness
Short circuit or ground fault in wir-
3
ing harness
Ground fault in wiring harness
4
(contact with ground circuit)
5 Defective pump controller
40
40-303
Hydraulic Oil Sensor Short Circuit
Failure
(Pump controller system)
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-Resis-
tance characteristics of
oil temperature sensor
Between P22 (male) (2) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector P22 and connect T-adapters to female side.
3. Turn starting switch to ON position.
a If voltage is 0 V, wiring harness has open circuit, ground fault, or short cir-
cuit, and if voltage is 24 V, wiring harness has hot short circuit.
a Voltage of about 5 V is applied to temperature sensor signal lines through
resistor in pump controller.
Between P22 (female) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector C01 and connect T-adapters to female side.
a Use Temperature-Resistance characteristics table for troubleshooting on
cause 1 as resistance criteria.
a If resistance is above 1 Mz, wiring harness has open circuit. If resistance
is below 1 z, wiring harness has short circuit.
Between C01 (female) (29) and (46)
Between C01 (female) (29) and ground
a If no failure is found by check 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
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
303 Troubleshooting by failure code, Part 3
Failure code [DGH2KB] Hyd Oil Sensor Short Circuit
10 °C Resistance
30 °C Resistance
80 °C Resistance
100 °C Resistance
Resistance
Voltage
Resistance
Resistance
Resistance
PC200, 200LC, 220, 220LC-8M0
Approx. 90 kz
Approx. 35 kz
Approx. 6.5 kz
Approx. 3.5 kz
Min. 1 Mz
Approx. 5 V
3.5 to 90 kz
Min. 1 Mz
Min. 1 Mz