Failure Code [Ca332] Injector #4 (L#4) Open Or Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [CA332] Injector #4 (L#4) Open or Short Circuit

Z0-A)
Action level Failure code
L03 CA332
Detail of
Open circuit or short circuit is detected in injector #4 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 injector
information
(positive) side. But it is pulse voltage and cannot be measured by using multimeter.
No. Cause
Defective wiring
1
harness connector
Defective injector #4
2
Open circuit or ground
3
fault in 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
6
harness
Defective other cylinder
7 injectors or wiring
harness
Defective engine
8
controller
PC88MR-10
Injector #4 (L#4) 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 CN2 and connect T-adapter to male side.
Between CN2 (male) (1) and (2)
Resistance
Between CN2 (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector J1 and connect T-adapter to female side.
Between J1 (female) (46) and (56)
Resistance
Between J1 (female) (46) and ground
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 CN2, and connect T-adapter to each
female side.
Between J1 (female) (46) and CN2 (female) (2)
Resistance
Between J1 (female) (56) and CN2 (female) (1)
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 CN2, and connect T-adapter to either
female side.
Between J1 (female) (46) or CN2 (female) (2) and
Resistance
ground
1. Turn starting switch to OFF position.
2. Disconnect connectors J1 and CN2, and connect T-adapter to the female
side of connector J1.
a Check by using multimeter in continuity mode.
Between J1 (female) (46) and each
pin other than pin (46)
Continuity
Between J1 (female) (56) and each
pin other than pin (56)
If failure codes of other injectors are displayed, perform troubleshooting for
them first.
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
No continuity (no sound
No continuity (no sound
(PC88MR-CA332-400-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
is heard)
is heard)
40-163