Code [131/Ca131] Throttle Sensor High Error - Komatsu 114E-3 Series Shop Manual

SEN00459-01
E-5 Code [131/CA131] Throttle Sensor High Error
Error code Failure code
131
Contents of
• High voltage is detected in fuel control dial signal circuit.
trouble
Action of con-
• Depends on machine model.
troller
Problem that
appears on • Depends on machine model.
machine
Related infor-
• Method of reproducing failure code: Starting switch ON.
mation
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
8
Trouble
CA131
Causes
Abnormally high level in throttle sensor power
Standard value in normal state/Remarks on troubleshooting
If failure code [CA2185] is indicated simultaneously, carry out trou-
bleshooting 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 J2 (female) (9) –
P20 (female) (2)
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)
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
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
J2
Between (22) – (23)
40 Troubleshooting
Power supply 4.75 – 5.25 V
Voltage
Resis-
tance
Power supply 4.75 – 5.25 V
114E-3 Series
1
Voltage
Max. 1 V
Min.
100 kz
Voltage