Failure Code [Ca154] Chg Air Temp Sensor Low Error; Failure Code [Ca187] Sens Supply 2 Volt Low Error - Komatsu Galeo PC800-8 Shop Manual

SEN00790-02

Failure code [CA154] Chg Air Temp Sensor Low Error

Action code Failure code
E15 CA154
Contents of
• Low temperature error occurred in charge air temperature sensor circuit.
trouble
Action of
• Fixes charge air temperature (air intake temperature) at 70°C and continues operation.
controller
Problem that
appears on • Starting performance of the engine lowers during low temperature.
machine
• The signal voltage of the charge temperature (boost temperature) sensor can be checked with the
Related
monitoring function. (Code: 18501 Boost temperature sensor voltage)
information
• Duplication of failure code: turn ON the starting switch.
Possible causes
and standard
value in normal
state

Failure code [CA187] Sens Supply 2 Volt Low Error

Action code Failure code
E15
Contents of
• Low voltage error occurred in sensor power supply 2 (5V) circuit.
trouble
• Engine Bkup speed sensor operates with signal from engine Ne speed sensor.
• Oil pressure sensor sets oil pressure to default (250 kPa {2.5 kg/cm
• Ambient pressure sensor sets ambient pressure to default (52.44 kPa {0.53 kg/cm
operation.
Action of
• Charge air pressure sensor fixes charge pressure at 400 kPa {4.1 kg/cm
controller
• EGR inlet pressure sensor sets EGR inlet pressure to default (102 kPa {1.0 kg/cm
operation.
• EGR valve lift sensor limits output, and closes EGR and bypass valves.
• Bypass valve lift sensor limits output, and closes EGR and bypass valves.
Problem that
appears on • Engine output lowers.
machine
Related
information
Possible causes
and standard
value in normal
state
38
Chg Air Temp Sensor Low Error
Trouble
(Engine controller system)
Cause
Carry out troubleshooting for failure code [CA153].
Trouble
CA187
Cause
Carry out troubleshooting for failure code [CA227].
Standard value in normal state/Remarks on troubleshooting
Sens Supply 2 Volt Low Error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
40 Troubleshooting
2 }) and continues operation.
2
}) and continues
2
} and continues operation.
2
}) and continues
PC800, 850-8