Failure Code [Ca131] Throttle Sensor High Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA131] Throttle Sensor High Error

Action level Failure code
L03 CA131
Detail of
High voltage appears in signal circuit of fuel dial sensor.
failure
Runs engine with signal voltage of fuel dial as fixed value (as if fuel dial is at the half
Action of
position)
controller
Problem on
Engine speed cannot be controlled by using fuel control dial.
machine
Signal voltage from fuel control dial can be checked with monitoring function.
Related
(Code: 03000 "Fuel Dial Sensor Volt")
information
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
Defective wiring harness
1
connector
Defective throttle sensor
2
power supply system
Defective throttle sensor (fuel
3
dial)
Open or short circuit in wiring
4
harness
Short circuit in wiring harness
5
Hot short circuit in wiring
6
harness
Defective engine controller
7
PC88MR-10
Throttle Sensor High Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
1. See descriptions of wiring harness and connectors in "c: Electrical
equipment" in "Checks before troubleshooting" of "Related
information on troubleshooting", and check it.
2. Turn starting switch to ON position.
If this failure code is not displayed, wiring harness connector is
defective.
a If this failure code is displayed, perform following checks.
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-adapter to male side.
Between P20 (male) (1) and (3)
Resis-
Between P20 (male) (2) and (3)
tance
Between P20 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector CE03, and connect T-adapter to female side.
Between CE03 (female) (41) and (42)
Resis-
tance Between CE03 (female) (51) and (42)
a If no failure is found by check on cause 4, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CE03 and P20, and connect T-adapter to
either female side.
Between CE03 (female) (51) and (42), or
Resis-
between P20 (female) (1) and (2)
tance
1. Turn starting switch to OFF position.
2. Disconnect connector P20 and connect T-adapter to female side.
3. Turn starting switch to ON position.
Voltage 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.)
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector CE03.
3. Turn starting switch to ON position.
4. Operate fuel dial and perform troubleshooting.
Between CE03 (42) and (41)
Voltage
Between CE03 (51) and (41)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-CA131-400-A-Z0-A)
Power
supply
Sensor
output
4.0 to 6.0 kz
3 to 7 kz
3 to 7 kz
4.0 to 6.0 kz
3 to 7 kz
Min. 1 Mz
Max 1 V
4.75 to 5.25 V
0.5 to 4.5 V
40-133