Failure Code [Ca154] Charge Temperature Sensor Low Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA154] Charge temperature sensor low error

Action code Failure code
E01
Contents of
• Low voltage is detected in temperature signal circuit of boost pressure sensor and temperature sen-
trouble
sor.
Action of
• Fixes charge temperature and continues operation.
controller
Problem that
• Exhaust smoke becomes white
appears on
• Boost temperature-based engine protection function does not function.
machine
• The input state (temperature) from the charge temperature sensor (boost temperature sensor) can
be checked with the monitoring function (Code: ENGINE, 18500, CHG TEMP).
Related
• The input state (voltage) from the charge temperature sensor (boost temperature sensor) can be
information
checked with the monitoring function (Code: ENGINE, 18501, CHG TEMP).
• Method of reproducing failure code: Turn the starting switch ON.
Defective [temperature sig-
nal circuit] of boost pressure
1
sensor, temperature sensor
(Internal trouble)
Possible causes
Ground fault in wiring har-
and standard
ness
value in normal
2
(Short circuit with ground cir-
state
cuit)
Short circuit in wiring har-
3 ness
(with another wiring harness)
Defective wiring harness
4
connector
20
40-320
Trouble
CA154
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA154] Charge temperature sensor low error
Charge temperature sensor low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
BOOST PRESS &
Charge temperature
IMT (male)
Between (2) and (1)
Between (2) and
ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (23) –
BOOST PRESS & IMT (female) (3) and
ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between EC1
(female) (23) – EC1 (female) (With all con-
nectors of wiring harness disconnected)
Connecting parts among boost pressure sensor/temperature sen-
sor, engine wiring harness, and engine controller are suspected.
Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
Resistance
0°C 29 – 36 kz
25°C 9 – 11 kz
40°C 4.9 – 5.8 kz
100°C 600 – 700 z
All range Min. 100 kz
Resis-
tance
Resis-
tance
WA250, 250PZ-6
1
Min.
100 kz
Min.
100 kz