20 PC800, 850-8
SEN00790-02 40 Troubleshooting
Failure code [CA122] Chg Air Press Sensor High Error
Action code Failure code
Trouble
Chg Air Press Sensor High Error
(Engine controller system)
E11 CA122
Contents of
trouble
• High pressure error occurred in charge air pressure sensor circuit.
Action of
controller
• Fixes charge pressure at 400 kPa {4.1 kg/cm
2
} and continues operation.
Problem that
appears on
machine
• Engine does not accelerate easily.
Related
information
• The signal voltage of the charge pressure (boost pressure) can be checked with the monitoring func-
tion. (Code: 36501 Boost pressure sensor voltage)
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective sensor power
supply system
If failure code [CA187] or [CA227] is displayed, carry out troubleshoot-
ing for it first.
2
Defective charge air pres-
sure sensor
(Internal defect)
Prepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting in each case.
PIM Voltage
Between (1) – (2) Power supply 4.75 – 5.25 V
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.
3
Disconnection in wiring har-
ness
(Disconnection in wiring or
defective contact in connec-
tor)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch ON.
Wiring harness between ENG (female) (37) –
PIM (female) (1)
Resis-
tance
Max. 1 z
Wiring harness between ENG (female) (47) –
PIM (female) (2)
Resis-
tance
Max. 1 z
Wiring harness between ENG (female) (44) –
PIM (female) (3)
Resis-
tance
Max. 1 z
4
Ground fault in wiring har-
ness
(Short circuit with GND cir-
cuit)
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
Resis-
tance
Min. 1 Mz
Between wiring harness of ENG (female) (47) –
PIM (female) (2) and chassis ground
Resis-
tance
Min. 1 Mz
Between wiring harness of ENG (female) (44) –
PIM (female) (3) and chassis ground
Resis-
tance
Min. 1 Mz
5
Short circuit in wiring har-
ness
(with another wiring har-
ness)
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)
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (37) –
PIM (female) (1) and between ENG
(female) (44) – PIM (female) (3)
Resis-
tance
Min. 1 Mz
Wiring harness between ENG (female) (47) –
PIM (female) (2) and between ENG
(female) (44) – PIM (female) (3)
Resis-
tance
Min. 1 Mz
6 Defective engine controller
aPrepare with starting switch OFF, then turn starting switch ON or start
engine and carry out troubleshooting.
ENG Voltage
Between (37) – (47) Power supply 4.75 – 5.25 V
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