Failure Code [Ca238] Ne Speed Sens Supply Volt Error - Komatsu PC200-8M0 Shop Manual

301 Troubleshooting by failure code, Part 1

Failure code [CA238] Ne Speed Sens Supply Volt Error

Failure code [CA238] Ne Speed Sens Supply Volt Error

Action
Failure code
level
L01 CA238
q
Detail of failure Low voltage appears in power supply circuit of engine Ne speed sensor.
Action of con-
q
Controls engine with signal from engine Bkup speed sensor.
troller
q
Running engine stops (when Bkup speed sensor is also defective).
q
Problem on Stopped engine cannot be started (when Bkup speed sensor is also defective).
q
machine Starting performance is poor.
q
Engine hunts.
Related infor-
q
Method of reproducing failure code: Turn starting switch to ON position.
mation
Cause
Defective wiring harness connec-
1
tor
2 Defective sensor or wiring harness
3 Defective engine controller
Circuit diagram related to Ne speed sensor
PC200, 200LC, 220, 220LC-8M0
Ne Speed Sensor Supply Voltage 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 following connectors one by one and turn starting switch to ON
position each time.
3. After each troubleshooting, return to step 1.
If this failure code is not displayed when a sensor is disconnected, sensor or
engine wiring harness is defective.
a Other failure codes are also displayed. This is because of disconnection of
connector. Ignore failure codes other than [CA238].
Sensor or harness
Ne speed sensor
Engine wiring harness
1. Turn starting switch to OFF position.
2. Disconnect connector ECM and connect T-adapters to male side.
3. Turn starting switch to ON position with engine wiring harness discon-
nected.
Between ECM (male) (16) and (48)
SEN06133-00
Connector
CRANK SENSOR
ECM
4.75 to
Voltage
5.25 V
40-301
45