Failure Code [Ca122] Chg Air Press Sensor High Error - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [CA122] Chg Air Press Sensor High Error

Action code Failure code
E11 CA122
Contents of
• High pressure error occurred in charge air pressure sensor circuit.
trouble
Action of
• Fixes charge pressure at 400 kPa {4.1 kg/cm
controller
Problem that
appears on • Engine does not accelerate easily.
machine
Related • The signal voltage of the charge pressure (boost pressure) can be checked with the monitoring func-
information tion. (Code: 36501 Boost pressure sensor voltage)
Defective sensor power
1
supply system
Defective charge air pres-
2 sure sensor
(Internal defect)
Disconnection in wiring har-
ness
3 (Disconnection in wiring or
defective contact in connec-
tor)
Possible causes
and standard
Ground fault in wiring har-
value in normal
ness
state
4
(Short circuit with GND cir-
cuit)
Short circuit in wiring har-
ness
5
(with another wiring har-
ness)
6 Defective engine controller
20
Chg Air Press Sensor High Error
Trouble
(Engine controller system)
Cause Standard value in normal state/Remarks on troubleshooting
If failure code [CA187] or [CA227] is displayed, carry out troubleshoot-
ing for it first.
Prepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting in each case.
Between (1) – (2)
Sensor voltage is measured with wiring harness connected. Accord-
ingly, if voltage is abnormal, check wiring harness and controller, too, for
another cause of trouble, and then judge.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (37) –
PIM (female) (1)
Wiring harness between ENG (female) (47) –
PIM (female) (2)
Wiring harness between ENG (female) (44) –
PIM (female) (3)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Between wiring harness of ENG (female) (37) –
PIM (female) (1) and chassis ground
Between wiring harness of ENG (female) (47) –
PIM (female) (2) and chassis ground
Between wiring harness of ENG (female) (44) –
PIM (female) (3) and chassis ground
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (37) –
PIM (female) (1) and between ENG
(female) (47) – PIM (female) (2)
Wiring harness between ENG (female) (37) –
PIM (female) (1) and between ENG
(female) (44) – PIM (female) (3)
Wiring harness between ENG (female) (47) –
PIM (female) (2) and between ENG
(female) (44) – PIM (female) (3)
aPrepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting.
Between (37) – (47)
2 } and continues operation.
PIM
Power supply
ENG
Power supply
40 Troubleshooting
Voltage
4.75 – 5.25 V
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage
4.75 – 5.25 V
PC800, 850-8