Code [2186/Ca2186] Throttle Sens. Sup. Volt. Low Error - Komatsu 114E-3 Series Shop Manual

40 Troubleshooting
E-50 Code [2186/CA2186] Throttle Sens. Sup. Volt. Low Error
Error code Failure code
2186 CA2186
Contents of
• Low voltage occurred in throttle sensor power supply 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
Ground fault in wiring har-
1 ness (Short circuit with GND
circuit)
Short circuit in wiring har-
Possible causes
2 ness (With another wiring
and standard
harness)
value in normal
state
Defective wiring harness
3
connector
4 Defective engine controller
Circuit diagram related to fuel control dial
114E-3 Series
Trouble Abnormally low level in throttle sensor power supply
Causes
a Troubleshoot with starting switch OFF, then carry out trouble-
shooting without turning starting switch ON.
Wiring harness between J2 (female) (22) –
P20 (female) (1)
a Troubleshoot with starting switch OFF, then carry out trouble-
shooting without turning starting switch ON.
Wiring harness among all pins between J2
(female) (9) – J2 (female) (With P20 discon-
nected)
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
If causes 1 – 3 are not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
Standard value in normal state/Remarks on troubleshooting
SEN00460-01
1
Resis- Min.
tance 100 kz
Resis- Min.
tance 100 kz
43