Failure Code [Ca131] Throttle Sensor High Error - Komatsu PC200-8M0 Shop Manual

SEN06133-00

Failure code [CA131] Throttle Sensor High Error

Action
Failure code
level
L03 CA131
q
Detail of failure High voltage appears in fuel control dial circuit.
q
Uses throttle value obtained before failure detection to run engine if failure is detected with starting
Action of con-
switch at ON position.
troller
q
Uses full throttle value to run engine if starting switch is set to ON position after failure detection.
Problem on
q
Engine speed cannot be controlled by using fuel control dial.
machine
q
Signal voltage from fuel control dial can be checked with monitoring function.
Related infor-
(Code: 03000 Fuel control dial voltage)
mation
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective wiring harness connec-
1
tor
Defective throttle sensor power
2
supply system
Defective fuel control dial (throttle
3
sensor)
Open or short circuit in wiring har-
4
ness
5 Short circuit in wiring harness
Hot short circuit in wiring harness
6
(contact with 24 V circuit)
7 Defective engine controller
24
40-301
Throttle Sensor High Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
See descriptions of wiring harness and connectors in "c: Electrical equip-
ment"of "Checks before troubleshooting" in "General information on trouble-
shooting", and check them.
If failure code [CA2185] is also displayed, perform troubleshooting for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector P20 and connect T-adapters to male side.
Between P20 (male) (1) and (3)
Between P20 (male) (2) and (3)
Between P20 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector CE02, and connect T-adapters to female side.
Between CE02 (famale) (22) and (23)
Between CE02 (famale) (9) and (23)
a If no failure is found in checks on cause 4, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CE02 and P20, and connect T-adapters to either
female side.
Between CE02 (female) (9) and (22), or between
P20 (female) (1) and (2)
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) (2) and ground
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
q
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector CE02.
3. Turn starting switch to ON position.
4. Operate fuel control dial and perform troubleshooting.
Between CE02 (22) and (23)
Between CE02 (9) and (23)
301 Troubleshooting by failure code, Part 1

Failure code [CA131] Throttle Sensor High Error

Resistance 4.0 to 6.0 kz
Resistance 0.25 to 5.0 kz
Resistance 0.25 to 5.0 kz
Resistance 4.0 to 6.0 kz
Resistance 0.25 to 5.0 kz
Resistance
Voltage
Power sup-
Voltage
ply
Sensor out-
Voltage
put
PC200, 200LC, 220, 220LC-8M0
Min. 1 Mz
Max. 1 V
4.75 to 5.25V
0.5 to 4.5 V