Failure Code [Ca352] Sensor1 Supply Voltage Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA352] Sensor1 Supply Voltage Low Error

Action level Failure code
L03 CA352
Detail of
Low voltage occurs in sensor power supply 1 (5 V) circuit.
failure
Closes EGR valve and opens variable flow turbocharger fully.
Action of
Signals from EGR valve sensor and variable flow turbocharger sensor are ignored.
controller
Limits engine output and runs engine.
Problem on
Engine output lowers.
machine
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
No. Cause
Defective wiring
1
harness connector
Defective sensor or
2
wiring harness
Defective relevant
3
system
Defective engine
4
controller
PC88MR-10
Sensor1 Supply Voltage Low Error
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 following connectors one by one and turn starting switch to ON
position each time.
3. Each time troubleshooting is finished, return to step 1.
If this failure code is not displayed, disconnected sensor or engine wiring
harness is defective.
a Other failure codes (many codes) are also displayed. They are generated
because of disconnection of connector. Ignore failure codes other than
[CA352].
Variable flow turbocharger
Connector
If other failure codes are also displayed, perform troubleshooting for them.
1. Turn starting switch to OFF position.
2. Disconnect connector J2 and connect T-adapter to male side.
3. Turn starting switch to ON position with connector J2 disconnected.
Voltage Between J2 (male) (30) and (47)
Troubleshooting by failure code (Display of code)
EGR valve
Engine harness
40 Troubleshooting
(PC88MR-CA352-400-A-Z0-A)
EGR V
VFT
J2
4.75 to 5.25
V
40-167