Failure Code [Ca331] Inj #2(L#2) Open/Short Error - Komatsu PC200-8M0 Shop Manual

SEN06134-00

Failure code [CA331] Inj #2(L#2) Open/Short Error

Action
Failure code
level
L03 CA322
q
Detail of failure Open or short circuit is detected in drive circuit of No. 2 injector.
Action of con-
q
None in particular
troller
q
Problem on Poor combustions or hunting occurs.
machine q Engine output lowers.
q Method of reproducing failure code: Start engine.
Related infor-
q
While engine is running normally, approximately 65 V of pulse voltage is supplied to injector (+)
mation
side. But it is pulse voltage and cannot be measured with multimeter.
Cause
Defective wiring harness connec-
1
tor
2 Defective No. 2 injector
Open circuit or ground fault in wir-
3
ing harness
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
5
(contact with ground circuit)
6 Short circuit in wiring harness
Defective other cylinder injectors
7
or wiring harness
8 Defective engine controller
12
40-302
Injector #2 (L#2) Open or 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 INJECTOR CYL 1&2 and connect T-adapter to male
side.
Between INJECTOR CYL 1&2 (male) (A) and (B)
Between INJECTOR CYL 1&2 (male) (B) and
ground
1. Turn starting switch to OFF position.
2. Disconnect connector ECM and connect T-adapters to female side.
Between ECM (female) (54) and (51)
Between ECM (female) (54) 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 INJECTOR CYL 1&2 and connect
T-adapters to each female side.
Between ECM (female) (54) and INJECTOR CYL
1&2 (female) (B)
Between ECM (female) (51) and INJECTOR CYL
1&2 (female) (A)
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 INJECTOR CYL 1&2 and connect
T-adapters to either female side.
Between ECM (female) (54) or INJECTOR CYL
1&2 (female) (B) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and INJECTOR CYL 1&2 and connect
T-adapter to female side of ECM.
a Check with multimeter in continuity mode.
Between ECM (female) (54) and each pin other
than (54)
Between ECM (female) (51) and each pin other
than (51)
If different failure codes are displayed, perform troubleshootings for them on
ahead.
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 [CA331] Inj #2(L#2) Open/Short Error

Resistance
Resistance Min. 100 kz
Resistance
Resistance Min. 100 kz
Resistance
Resistance
Resistance Min. 100 kz
No continuity (no sound
No continuity (no sound
PC200, 200LC, 220, 220LC-8M0
Max. 2 z
Max. 2 z
Max. 2 z
Max. 2 z
is heard.)
is heard.)