Failure Code [Dhpama] F Pump Press Sensor Abnormality - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02631-02

Failure code [DHPAMA] F Pump Press Sensor Abnormality

Action code Failure code
— DHPAMA
Contents of
• Signal voltage from F pump pressure sensor is below 0.3 V or above 4.42 V.
trouble
Action of con-
• Fixes F pump 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 F pump pressure sensor (pressure) can be checked with monitoring function.
(Code 01112: F pump pressure
Defective sensor power sup-
1
ply system
Defective F pump pressure
2 sensor
(Internal defect)
Possible causes
and standard
value in normal
state
Disconnection in wiring har-
ness
3 (Disconnection in wiring or
defective contact in connec-
tor)
Ground fault in wiring har-
ness
4
(Short circuit with GND cir-
cuit)
Hot short (Short circuit with
5
24V circuit) in wiring harness
8
F pump 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
a
a
Wiring harness between CP01 (female) (9) –
P25 (female) (3)
Wiring harness between CP01 (female) (18)
– P25 (female) (1)
Wiring harness between CP01 (female) (49)
– P25 (female) (2)
a
Wiring harness between CP01 (female) (49)
– P25 (female) (2) and chassis ground
a
Wiring harness between CP01 (female) (9) –
P25 (female) (3) and chassis ground
Wiring harness between CP01 (female) (49)
– P25 (female) (2) and chassis ground
2
} and continues control.
Prepare with starting switch OFF, then start engine and carry
out troubleshooting.
P25
Between (3) – (1)
Between (2) – (1)
If the power supply voltage is normal and the signal voltage is
not normal, perform troubleshooting as follows.
1) Turn starting switch to OFF position.
2) Replace connector P25 with connector P26 of R pump
pressure sensor.
3) Turn starting switch to ON position and display the electri-
cal failure history screen of the machine monitor.
4) If E mark is not lighted in failure code column, F pump
pressure sensor is defective.
After the troubleshooting, restore the connector.
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.
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
PC300, 350-8