Failure Code [Dhs4Ma] Bucket Curl Ppc Press Sensor Abnormality - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DHS4MA] Bucket Curl PPC Press Sensor Abnormality

Action code Failure code
— DHS4MA
Contents of
• Signal voltage from bucket curl PPC pressure sensor is below 0.3 V or above 4.42 V.
trouble
Action of con-
• Fixes bucket curl PPC pressure at 0 MPa {0 kg/cm
troller
• If cause of failure disappears, system resets itself.
Problem that
appears on • No automatic gear shifting
machine
a
If 5V circuit (3) and ground circuit (1) of pressure sensor are connected inversely, pressure sensor
Related infor- will be broken. Accordingly, take extreme care when checking.
mation
• Input from bucket curl PPC pressure sensor (pressure) can be checked with monitoring function.
(Code 07300: Bucket Curl PPC pressure)
Defective sensor power sup-
1
ply system
Defective bucket curl PPC
2 pressure sensor (Internal
defect)
Disconnection in wiring har-
ness
3 (Disconnection in wiring or
defective contact in connec-
tor)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
ness
4
(Short circuit with GND cir-
cuit)
Hot short (Short circuit with
5
24V circuit) in wiring harness
6 Defective pump controller
14
Bucket CURL PPC press sensor abnormality
Trouble
(Pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
If failure code [DA25KP] is also displayed, carry out troubleshooting
for it first.
a
a
Wiring harness between CP01 (female) (9) –
P01 (female) (3)
Wiring harness between CP01 (female) (18)
– P01 (female) (1)
Wiring harness between CP01 (female) (73)
– P01 (female) (2)
a
Wiring harness between CP01 (female) (73)
– P01 (female) (2) and chassis ground
a
Wiring harness between CP01 (female) (9) –
P01 (female) (3) and chassis ground
Wiring harness between CP01 (female) (73)
– P01 (female) (2) and chassis ground
a
2
} and continues control.
Prepare with starting switch OFF, then start engine and carry
out troubleshooting.
P01
Between (3) – (1)
Between (2) – (1)
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 start engine and carry
out troubleshooting.
CP01
Between (9) – (18)
Between (73) – (18)
40 Troubleshooting
1
Voltage
4.5 – 5.5 V
0.5 – 4.5 V
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Voltage Max. 1 V
Voltage Max. 1 V
Voltage
4.5 – 5.5 V
0.5 – 4.5 V
PC300, 350-8