Failure Code [Ca451] Common Rail Pressure Sensor High Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA451] Common Rail Pressure Sensor High Error

400-A-Z0-A)
Action level Failure code
L03 CA451
Detail of
High voltage appears 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
This failure code appears if common rail pressure sensor connector is disconnected.
Method of reproducing failure code: Turn starting switch to ON position.
No. Cause
1 Defective harness connector
Defective common rail
pressure sensor power supply
2
system
Open circuit in wiring harness
3
(wire breakage or defective
contact of connector)
Short circuit in wiring harness
4
PC88MR-10
Common Rail Pressure Sensor High 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 disappears, harness connector is defective.
a If this failure code appears, 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) and
Voltage
(3)
1. Turn starting switch to OFF position.
2. Disconnect connectors PFUEL and J2, and connect T-adapters to
each female side of connectors.
a If power supply input is normal in check on
cause 2, this check is not required.
Between J2 (female) (31) and PFUEL
(female) (1)
a If power supply input is normal in check on
Resistance
cause 2, this check is not required.
Between J2 (female) (21) and PFUEL
(female) (3)
Between J2 (female) (55) and PFUEL
(female) (2) (sensor output)
1. Turn starting switch to OFF position.
2. Disconnect connectors PFUEL and J2.
3. Connect T-adapter to either female side.
Between J2 (female) (55) and (31), or
Resistance
between PFUEL (2) and (1)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-CA451-
Power
4.75 to 5.25
supply
V
input
Max. 1 z
Max. 1 z
Max. 1 z
Min. 1 Mz
40-179