Komatsu BR380JG-1E0, Shop Manual, Page: 576 / 841

SEN02092-00 40 Troubleshooting
16
BR380JG-1E0
Failure code [CA131] Throttle sensor too high 1
User code Failure code
Trouble
Throttle sensor too high
(Engine controller system)
E14 CA131
Contents of
trouble
• Signal circuit of fuel control dial detected high voltage.
Action of
controller
• If trouble occurs while starting switch is in ON position, controller fixes voltage value to level just
before detection of trouble and continues operation.
• If starting switch is turned ON while voltage is abnormally high, controller continues operation with
voltage at 100% value.
Problem that
appears on
machine
• Engine speed cannot be controlled with fuel control dial.
Related
information
• Signal voltage of fuel control dial can be checked with monitoring function.
(Code: 03000 , Fuel Dial Pos Sens Volt)
• Method of reproducing failure code: Turn starting switch ON.
Possible
causes and
standard value
in normal state
Cause Standard value in normal state/Remarks on troubleshooting
1
Defective throttle sen-
sor power supply sys-
tem
If failure code [ CA2185 ] is also indicated, carry out troubleshooting for it
first.
2
Defective fuel control
dial
a
Prepare with engine starting switch OFF, then turn engine starting
switch ON and carry out troubleshooting.
P10 Voltage
Between (1) – (3) Power supply 4.75 – 5.25 V
Voltage is measured with wiring harness connected. Accordingly, if voltage
is abnormal, check wiring harness and controller, too, for another cause of
trouble, and then judge.
3
Hot short (Short circuit
with 5 V/24 V circuit) in
wiring harness
a
Prepare with engine starting switch OFF, then turn engine starting
switch ON and carry out troubleshooting.
Wiring harness between CE02 (female) (9) –
P10 (female) (2)
Voltage Max. 1 V
4
Short circuit in wiring
harness (with another
wiring harness)
a
Prepare with engine starting switch OFF, then carry out troubleshooting
without turning engine starting switch ON.
Wiring harness between CE02 (female) (9) –
P10 (female) (2) and between CE02 (female)
(22) – P10 (female) (1)
Resistance Min. 100 k
z
5
Defective wiring har-
ness connector
Connecting parts between fuel control dial – machine wiring harness –
engine controller may be defective. Check them directly.
• Looseness of connector, breakage of lock, or breakage of seal
• Corrosion, bend, breakage, push-in, or expansion of pin
• Moisture or dirt in connector or defective insulation
6
Defective engine
controller
a
Prepare with engine starting switch OFF, then turn engine starting
switch ON and carry out troubleshooting.
CE02 Voltage
Between (22) – (23) Power supply 4.75 – 5.25 V