Failure Code [Ca131] Throttle Sensor High Error - Komatsu ecot3 PC300LC-8 Shop Manual

SEN02629-03

Failure code [CA131] Throttle Sensor High Error

Action code Failure code
E14
Contents of
• Signal circuit of fuel control dial detected high voltage.
trouble
• If trouble occurs while starting switch is in ON position, controller fixes voltage value to level just
Action of before detection of trouble and continues operation.
controller • If starting switch is turned ON while voltage is abnormally high, controller continues operation with
voltage at 100% value.
Problem that
appears on • Engine speed cannot be controlled with fuel control dial.
machine
• Signal voltage of fuel control dial can be checked with monitoring function. (Code: 03000 Fuel con-
Related infor-
trol dial voltage)
mation
• Method of reproducing failure code: Turn starting switch ON.
Defective throttle sensor
1
power supply system
2 Defective fuel control dial
Hot short (Short circuit with 5
3 V/24 V circuit) in wiring har-
Possible causes
ness
and standard
value in normal
state
Short circuit in wiring har-
4 ness (with another wiring
harness)
Defective wiring harness
5
connector
6 Defective engine controller
24
Trouble
CA131
Cause
Throttle sensor high error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA2185] is also indicated, carry out troubleshooting
for it first.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
P20
Between (1) – (3)
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.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between CE02 (female) (9) –
P20 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between CE02 (female) (9) –
P20 (female) (2) and between CE02 (female)
(22) – P20 (female) (1)
Connecting parts between fuel control dial – machine wiring har-
ness – 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
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
CE02
Between (22) – (23)
40 Troubleshooting
Power supply 4.75 – 5.25 V
Voltage
Resis-
tance
Power supply 4.75 – 5.25 V
PC300, 350-8
1
Voltage
Max. 1 V
Min. 100
kz
Voltage