Failure Code [Ca2186] Throttle Sensor Supply Voltage Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA2186] Throttle Sensor Supply Voltage Low Error

CA2186-400-A-Z0-A)
Action level Failure code
L03 CA2186
Detail of
Low voltage appears in throttle sensor power supply (5 V) circuit.
failure
Uses throttle value obtained before failure detection to run engine if failure is detected
Action of with starting switch at ON position.
controller Uses full throttle value to run engine if starting switch is set to ON position after failure
detection.
Problem on
Engine speed cannot be controlled by using fuel control dial.
machine
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
N-
Cause
o.
Defective wiring harness
1
connector
Defective throttle sensor
2
(fuel control dial)
Ground fault in wiring
harness
3
(contact with ground circuit)
Short circuit in wiring
4
harness
5 Defective engine controller
PC88MR-10
Throttle Sensor Supply Voltage Low 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 "General information
on troubleshooting", and check it.
2. Turn starting switch to ON position.
If this failure code disappears, wiring harness connector is defective.
a If this failure code appears, perform following checks.
1. Turn starting switch to OFF position.
2. Disconnect connector P20, and turn starting switch to ON position.
If this failure code disappears, throttle sensor is defective.
a Other failure codes are also displayed. They are generated because of
disconnection of connector. Ignore failure codes other than [CA2186].
1. Turn starting switch to OFF position.
2. Disconnect connectors CE03 and P20, and connect T-adapter to either
female side.
Between ground and CE03 (female) (42) or P20
Resis-
(female) (1)
tance
1. Turn starting switch to OFF position.
2. Disconnect connectors CE03 and P20, and connect T-adapter to
female side of CE03.
3. Turn starting switch to ON position.
Between CE03 (female) (42) and each pin other
Resis-
than pin CE03 (female) (42)
tance
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.
Voltage Between CE03 (42) and (41)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
Power
supply
(PC88MR-
Min. 1 Mz
Min. 1 Mz
4.75 to 5.25 V
40-221