Failure Code [Ca2186] Throt Sens Sup Volt Low Error - Komatsu PC200-8M0 Shop Manual

SEN06134-00

Failure code [CA2186] Throt Sens Sup Volt Low Error

Action
Failure code
level
L03 CA2186
q
Detail of failure Low voltage appears in throttle sensor power supply circuit.
Action of con-
q
Sets throttle position by using signal other than throttle sensor signal and allows engine to run.
troller
Problem on
q
Engine speed cannot be controlled by fuel control dial.
machine
Related infor-
q
Method of reproducing failure code: Turn starting switch to ON position.
mation
Cause
Defective wiring harness connec-
1
tor
Defective throttle sensor (fuel con-
2
trol dial)
Ground fault in wiring harness
3
(contact with ground circuit)
4 Short circuit in wiring harness
5 Defective engine controller
Circuit diagram related to throttle sensor
50
40-302
Throttle Sensor Power Supply Voltage Low Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
See descriptions of wiring harness and connectors in "c: Electrical equipment"
of "Checks before troubleshooting" in "General information on troubleshoot-
ing", and check them.
1. Turn starting switch to OFF position.
2. Disconnect connector P20, and turn starting switch to ON position.
If this failure code is not displayed, throttle sensor is defective.
a Other failure code is displayed too. This is because connector is discon-
nected. Ignore failure codes other than [CA2186].
1. Turn starting switch to OFF position.
2. Disconnect connectors CE02 and P20, and connect T-adapters to either
female side.
Between CE02 (female) (22) or P20 (female) (1)
and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors CE02 and P20, and connect T-adapters to female
side of CE02.
3. Turn starting switch to ON position.
Between CE02 (female) (22) and each pin other
than (22)
1. Turn starting switch to OFF position.
2. Disconnect connector CE02, and connect T-adapters to male side.
3. Turn starting switch to ON position with wiring harness disconnected.
Between CE02 (male) (22) and (23)
302 Troubleshooting by failure code, Part 2

Failure code [CA2186] Throt Sens Sup Volt Low Error

PC200, 200LC, 220, 220LC-8M0
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Voltage 4.75 to 5.25V