Failure Code [Ca238] Ne Speed Sensor Supply Voltage Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA238] NE Speed Sensor Supply Voltage Error

Z0-A)
Action level Failure code
L01 CA238
Detail of
Ne speed sensor power supply (5 V) circuit is defective.
failure
Action of
Controls engine by using signals of Bkup speed sensor.
controller
Running engine stops (when Bkup (G) speed sensor is also abnormal).
Problem on
Stopped engine cannot be started (when Bkup(G) speed sensor is also abnormal).
machine
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
No. Cause
Defective wiring
1
harness connector
Defective sensor or
2
wiring harness
Defective engine
3
controller
Circuit diagram related to Ne speed sensor
PC88MR-10
NE Speed Sensor Supply Voltage 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 does not appear, harness connector is defective.
a If this failure code appears, perform the following.
1. Turn starting switch to OFF position.
2. Disconnect following connectors one by one and turn starting switch to ON
position each time.
3. After each troubleshooting, turn starting switch to OFF position.
If this failure code is not displayed when a sensor is disconnected, sensor or
engine wiring harness is defective.
a Other failure codes are displayed, too. This is because connector is
disconnected. Ignore failure codes other than [CA238].
Ne speed sensor
Connector
Engine wiring harness
1. Turn starting switch to OFF position.
2. Disconnect connector J1 and connect T-adapter to male side.
3. Turn starting switch to ON position with engine wiring harness
disconnected.
Voltage Between J1 (male) (36) and (37)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-CA238-400-A-
NE
J1
4.75 to 5.25
V
40-153