Failure Code [Ca272] Imv/Pcv1 Open Error - Komatsu PC200-8M0 Shop Manual

SEN06133-00

Failure code [CA272] IMV/PCV1 Open Error

Action
Failure code
level
L03 CA272
q
Detail of failure Open circuit is detected in drive circuit of supply pump actuator.
Action of con-
q
None in particular
troller
q
Problem on Engine runs but its speed does not stabilize.
machine q Common rail fuel pressure rises above command value.
q
Method of reproducing failure code: Turn starting switch to ON position.
q
Related infor- Because troubleshooting "socket" for this sensor features female connector alone, it is not connect-
mation able to female connector of sensor wiring harness, and thus not usable for checking open circuit
(not designed as a T-adapter).
Cause
Defective wiring harness connec-
1
tor
2 Defective supply pump actuator
Open or short circuit in wiring har-
3
ness
Hot short circuit in wiring harness
4
(contact with 24 V circuit)
5 Defective engine controller
48
40-301
IMV/PCV1 Open circuit 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 connector CP3 PUMP REGULATOR.
Between CP3 PUMP REGULATOR (male) (1) and
(2)
1. Turn starting switch to OFF position.
2. Disconnect connector ECM and connect T-adapters to female side.
Between ECM (female) (2) and (32)
1. Turn starting switch to OFF position.
2. Disconnect connector CP3 PUMP REGULATOR.
3. Insert T-adapters to connector ECM.
4. Turn starting switch to ON position and perform troubleshooting after one
minute or longer (with connector CP3 PUMP REGULATOR disconnected).
a Average voltage is displayed because of PWM.
Between ECM (2) and (32)
If no failure is found by above checks, engine controller is defective. (Since
this is internal defect, troubleshooting cannot be performed.)
301 Troubleshooting by failure code, Part 1

Failure code [CA272] IMV/PCV1 Open Error

Resistance
Resistance
Voltage
PC200, 200LC, 220, 220LC-8M0
Max. 5 z
Max. 5 z
Max. 3 V