Komatsu 114E-3 Series - E-5 Code [131;CA131] Throttle Sensor High Error

SEN00459-01 40 Troubleshooting
8 114E-3 Series
E-5 Code [131/CA131] Throttle Sensor High Error 1
Error code Failure code
Trouble Abnormally high level in throttle sensor power
131 CA131
Contents of
trouble
• High voltage is detected in fuel control dial signal circuit.
Action of con-
troller
• Depends on machine model.
Problem that
appears on
machine
• Depends on machine model.
Related infor-
mation
• Method of reproducing failure code: Starting switch ON.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective throttle sensor
power supply system
If failure code [CA2185] is indicated simultaneously, carry out trou-
bleshooting for it first.
2 Defective fuel control dial
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
P20 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 har-
ness
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Wiring harness between J2 (female) (9) –
P20 (female) (2)
Voltage Max. 1 V
4
Short circuit in wiring har-
ness (With another wiring
harness)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J2 (female) (9) –
P20 (female) (2) and between J2 (female)
(22) – P20 (female) (1)
Resis-
tance
Min.
100 kz
5
Defective wiring harness
connector
Connecting parts among fuel control dial, engine unit wiring har-
ness, 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
6 Defective engine controller
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
J2 Voltage
Between (22) – (23) Power supply 4.75 – 5.25 V