Failure Code [Ca452] Rail Press Sensor Low Error - Komatsu PC200-8M0 Shop Manual

SEN06134-00

Failure code [CA452] Rail Press Sensor Low Error

Action
Failure code
level
L03 CA452
q
Detail of failure Low voltage appears in signal circuit of common rail pressure sensor.
Action of con-
q
Restricts engine output and allows engine to run.
troller
q
Problem on Engine speed or output lowers.
machine q Engine does not start
q
Signal voltage of common rail pressure sensor can be checked with monitoring function.
(Code: 36401 Common rail pressure sensor volt)
Related infor-
q
Method of reproducing failure code: Turn starting switch to ON position.
mation
q
If sensor connector is disconnected even in normal condition, failure code [CA451] for "High Error"
is displayed.
Cause
Defective wiring harness connec-
1
tor
Defective common rail pressure
2
sensor power supply system
Defective common rail pressure
3
sensor
Ground fault in wiring harness
4
(contact with ground circuit)
5 Short circuit in wiring harness
6 Defective engine controller
34
40-302
Common Rail Pressure Sensor Low 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.
If failure code [CA187] (ground fault in sensor power supply system) or
[CA227] is displayed, perform troubleshooting for it first.
a Check that failure code [CA187] (Ground fault in sensor power supply sys-
tem) is not displayed.
1. Turn starting switch to OFF position.
2. Disconnect connector FUEL RAIL PRESS.
3. Turn starting switch to ON position.
If failure code [CA452] changes to [CA451] , sensor is defective.
q
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapters to connector ECM.
3. Turn starting switch to ON position.
Between ECM (25) and (47)
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and FUEL RAIL PRESS, and connect
T-adapter to female side of ECM.
Between ECM (female) (25) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and FUEL RAIL PRESS, and connect
T-adapter to female side of ECM.
Between ECM (female) (25) and (47)
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
302 Troubleshooting by failure code, Part 2

Failure code [CA452] Rail Press Sensor Low Error

Sensor out-
put
Resistance Min. 100 kz
Resistance Min. 100 kz
PC200, 200LC, 220, 220LC-8M0
Voltage 0.2 to 4.6 V