Failure Code [Ca122] Charge Air Press Sensor High Error - Komatsu Galeo PC138US-8 Shop Manual

SEN02463-01

Failure code [CA122] Charge air press sensor high error

User code Failure code
E11
Contents of
• High voltage was detected in charge pressure sensor circuit.
trouble
Action of
• Fixes charge pressure (400 kPa {4.08 kg/cm
controller
Problem that
appears on • Acceleration performance of engine drops.
machine
• Signal voltage of charge pressure sensor can be checked with monitoring function.
Related
(Code: 36501 Boost pressure sensor voltage).
information
• Method of reproducing failure code: Turn starting switch ON.
Defective sensor power sup-
1
ply system
Defective charge pressure
2 sensor
(Internal trouble)
Possible causes
Disconnection in wiring har-
and standard
ness
value in normal
3 (Disconnection in wiring or
state
defective contact in connec-
tor)
Ground fault in wiring har-
ness
4
(Short circuit with GND cir-
cuit)
14
Trouble
CA122
Causes
Charge air press sensor high error
(Engine controller system)
2
}) and continues operation.
Standard value in normal state/Remarks on troubleshooting
If failure code [CA187] or [CA227] is indicated, carry out trouble-
shooting for it first.
Prepare with starting switch OFF, then turn starting switch ON or
start engine and carry out troubleshooting.
PTIM
Between (2) – (4)
Sensor voltage is measured with wiring harness connected.
Accordingly, if voltage is abnormal, check wiring harness and con-
troller, too, for another cause of trouble, and then judge.
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (19)
– PTIM (female) (1)
Wiring harness between CE01 (female) (36)
– PTIM (female) (2)
Wiring harness between CE01 (female) (48)
– PTIM (female) (4)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between CE01 (female) (19)
– PTIM (female) (1) and chassis ground
Wiring harness between CE01 (female) (36)
– PTIM (female) (2) and chassis ground
Wiring harness between CE01 (female) (48)
– PTIM (female) (4) and chassis ground
40 Troubleshooting
Power supply 4.75 – 5.25 V
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
PC138US, USLC-8
1
Voltage
Max. 1 z
Max. 1 z
Max. 1 z
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz