Failure Code [Ca271] Imv/Pcv1 Short Error - Komatsu PC200-8M0 Shop Manual

SEN06133-00

Failure code [CA271] IMV/PCV1 Short Error

Action
Failure code
level
L03 CA271
q
Detail of failure Short circuit is detected in drive circuit of supply pump actuator.
Action of con-
q
None in particular
troller
q
Engine speed does not increase from low idle.
Problem on
q Engine output lowers.
machine
q
Common rail fuel pressure rises above command value.
Related infor-
q
Method of reproducing failure code: Turn starting switch to ON position.
mation
Cause
Defective wiring harness connec-
1
tor
2 Defective supply pump actuator
Short circuit or ground fault in wir-
3
ing harness
4 Short circuit in wiring harness
Ground fault in wiring harness
5
(contact with ground circuit)
6 Defective engine controller
46
40-301
IMV/PCV1 Short 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.
3. Turn starting switch to ON position.
If failure code changes from [CA271] to [CA272] , supply pump actuator is
defective.
1. Turn starting switch to OFF position.
2. Disconnect connector ECM and connect T-adapters to female side.
Between ECM (female) (2) and (32)
Between ECM (female) (2) and ground
a If no failure is found in checks on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and CP3 PUMP REGULATOR and connect
T-adapter to female side of ECM.
Between ECM (female) (2) and (32)
a If no failure is found in checks on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and CP3 PUMP REGULATOR and connect
T-adapter to female side of ECM.
Between ECM (female) (2) and ground
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
301 Troubleshooting by failure code, Part 1

Failure code [CA271] IMV/PCV1 Short Error

Resistance
Resistance Min. 100 kz
Resistance Min. 100 kz
Resistance Min. 100 kz
PC200, 200LC, 220, 220LC-8M0
1 to 5 z