Failure Code [Ca452] Common Rail Pressure Sensor Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA452] Common Rail Pressure Sensor Low Error

400-A-Z0-A)
Action level Failure code
L03 CA452
Detail of
Low voltage occurs in signal circuit of common rail pressure sensor.
failure
Action of
Limits engine output and runs engine(limits common rail pressure).
controller
Problem on
Engine output lowers.
machine
Signal voltage from common rail pressure sensor can be checked with monitoring
function. (Code: 36401 (V))
Common rail pressure sensed by common rail pressure sensor can be checked with
Related
monitoring function. (Code: 36400 (MPa))
information
Method of reproducing failure code: Turn starting switch to ON position.
If sensor connector is disconnected even in normal condition, failure code [CA451] for
"High Error" is generated instead of this code.
No. Cause
Defective wiring harness
1
connector
Defective common rail
pressure sensor power supply
2
system
Defective common rail
3
pressure sensor
Open circuit in wiring harness
4
(wire breakage or defective
contact of connector)
Ground fault in wiring harness
5
(contact with ground circuit)
PC88MR-10
Common Rail Pressure Sensor 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 "General
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.
a If failure code [CA515] or [CA516] is also displayed, perform
troubleshooting for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector PFUEL, and connect T-adapter to female side
of connector.
3. Turn starting switch to ON position.
Between PFUEL (female) (1)
Voltage
and (3)
1. Turn starting switch to OFF position.
2. Disconnect connector PFUEL.
3. Turn starting switch to ON position.
If failure code [CA452] changes to [CA451], sensor is defective.
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector PFUEL or J2.
3. Turn starting switch to ON position.
Between PFUEL (2) and (3), or
Voltage
between J2 (55) and (21)
1. Turn starting switch to OFF position.
2. Disconnect connectors J2 and PFUEL, and connect T-adapters to
each female side of connectors.
a Open circuit of 5 V circuit
Between J2 (female) (31) and PFUEL
Resistance
(female) (1)
1. Turn starting switch to OFF position.
2. Disconnect connectors J2 and PFUEL, and connect T-adapter to
either female side.
Between ground and PFUEL (female) (2) or
Resistance
J2 (female) (55)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
Power
supply
Sensor
output
(PC88MR-CA452-
4.75 to 5.25 V
input
0.2 to 4.6 V
Max. 1 z
Min. 1 Mz
40-181