Failure Code [Ca2185] Throt Sens Sup Volt High Error - Komatsu PC200-8M0 Shop Manual

SEN06134-00

Failure code [CA2185] Throt Sens Sup Volt High Error

Action
Failure code
level
L03 CA2185
q
Detail of failure High voltage (5.25 V or higher) 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)
3 Short circuit in wiring harness
Hot short circuit in wiring harness
4
(contact with 24 V circuit)
5 Defective engine controller
Circuit diagram related to throttle sensor
48
40-302

Failure code [CA2185] Throt Sens Sup Volt High Error

Throttle Sensor Power Supply Voltage High Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
See descriptions of wiring harness and connectors in "c: Electrical equipment"
in "Checks before troubleshooting" of "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 codes are displayed, too. This is because connector is discon-
nected. Ignore failure codes other than [CA2185].
1. Turn starting switch to OFF position.
2. Disconnect connectors CE02, CE03 and P20, and connect T-adapters to
each female side of CE02 and CE03.
Between CE02 (female) (22) and each pin other
than (22)
Between CE02 (female) (22) and CE03 (female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connector P20 and connect T-adapters to female side.
3. Turn starting switch to ON position.
Between P20 (female) (1) and ground
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
Resis-
tance
Resis-
tance
Voltage
Voltage
PC200, 200LC, 220, 220LC-8M0
Min. 1 Mz
Min. 1 Mz
4.75 to 5.25V
4.75 to 5.25V