Failure Code [Ca322] Injector #1 (L#1) Open Or Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [CA322] Injector #1 (L#1) Open or Short Circuit

Z0-A)
Action level Failure code
L03 CA322
Detail of
Open circuit or short circuit is detected in injector #1 circuit.
failure
Action of
controller
Engine output lowers.
Problem on
Engine speed does not stabilize.
machine
Method of reproducing failure code: Start engine.
Related
While engine is running normally, approximately 65 V of pulse voltage is applied to
information
injector (positive) side. But it is pulse voltage and cannot be measured by using
multimeter.
No. Cause
Defective wiring harness
1
connector
Defective injector #1
2
Open circuit or ground fault in
3
wiring harness
Open circuit in wiring harness
4
(wire breakage or defective
contact of connector)
Ground fault in wiring
harness
5
(contact with ground circuit)
Short circuit in wiring harness
6
PC88MR-10
Injector #1 (L#1) Open or Short Circuit
Failure
(Engine controller system)
Procedure, measuring location, criteria, and remarks
1. See descriptions of wiring harness and connectors in "c: Electrical
equipment" in "Checks before troubleshooting" of "Related
information on troubleshooting", and check it.
2. Turn starting switch to ON position.
If this failure code is not displayed, wiring harness connector is
defective.
a If this failure code is displayed, perform following checks.
1. Turn starting switch to OFF position.
2. Disconnect connector CN1 and connect T-adapter to male side.
Resis-
Between CN1 (male) (3) and (4)
tance
Resis-
Between CN1 (male) (3) and ground
tance
1. Turn starting switch to OFF position.
2. Disconnect connector J1 and connect T-adapter to female side.
Resis-
Between J1 (female) (48) and (58)
tance
Resis-
Between J1 (female) (48) and ground
tance
a If no failure is found by check on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors J1 and CN1, and connect T-adapters to each
female side.
Resis-
Between J1 (female) (48) and CN1 (female) (3)
tance
Resis-
Between J1 (female) (58) and CN1 (female) (4)
tance
a If no failure is found by check on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors J1 and CN1, and connect T-adapters to
either female side.
Between J1 (female) (48) or CN1 (female) (3)
Resis-
and ground
tance
1. Turn starting switch to OFF position.
2. Disconnect connectors J1 and CN1, and connect T-adapters to
female side of connector J1.
a Check by using multimeter in continuity mode.
Between J1 (female) (48) and each
pin other than pin (48)
Continuity
Between J1 (female) (58) and each
pin other than pin (58)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-CA322-400-A-
0.4 to 1.1 z
Min. 1 Mz
0.4 to 1.1 z
Min. 1 Mz
Max. 1 z
Max. 1 z
Min. 1 Mz
No continuity (no
sound is heard)
No continuity (no
sound is heard)
40-157