Failure Code [Ca222] Ambient Pressure Sensor Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA222] Ambient Pressure Sensor Low Error

Action level Failure code
L03 CA222
Detail of
Low voltage occurs in signal circuit of ambient pressure sensor.
failure
Sets ambient pressure to fixed value (52.44 kPa {0.53 kg/cm
Action of
Closes EGR valve and opens variable flow turbocharger fully.
controller
Limits engine output and runs engine.
Problem on
Engine output lowers.
machine
Signal voltage from ambient pressure sensor can be checked with monitoring function.
(Code: 37401 (V))
Ambient pressure sensed by ambient pressure sensor can be checked with monitoring
function. (Code: 37400 (kPa))
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
Since female connector alone is provided for "socket" used for troubleshooting of this
sensor, it is not usable for check of open circuit in wiring harness and voltage at sensor
connector (not designed as T-adapter).
This failure code appears if sensor connector is disconnected.
No. Cause
Defective wiring
1
harness connector
Defective ambient
pressure sensor power
2
supply system
Short circuit in wiring
3
harness
Ground fault in wiring
harness
4
(contact with ground
circuit)
Open circuit in wiring
5
harness
PC88MR-10
Ambient 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 "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.
If failure code [CA187] or [CA227] is also displayed, perform troubleshooting
for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector PAMB, and connect T-adapter to female side.
3. Turn starting switch to ON position.
Voltage Between PAMB (female) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connectors PAMB and J1, and connect T-adapter to either
female side.
Between J1 (female) (16) and (59), or between
Resistance
PAMB (female) (3) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connectors PAMB and J1, and connect T-adapter to either
female side.
Between ground and J1 (female) (16) or PAMB
Resistance
(female) (3)
1. Turn starting switch to OFF position.
2. Disconnect connectors PAMB and J1, and connect T-adapter to female
side of connector J1.
Between J1 (female) (16) and PAMB (female) (3)
Between J1 (female) (59) and PAMB (female) (2)
Resistance
Between J1 (female) (60) and PAMB (female) (1)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
}) and runs engine.
2
supply input
(PC88MR-CA222-400-A-Z0-A)
Power
4.75 to 5.25
V
Min. 1 Mz
Min. 1 Mz
Max. 1 z
Max. 1 z
Max. 1 z
40-149