Failure Code [Ca222] Ambient Press Sens Low Error - Komatsu PC200-8M0 Shop Manual

SEN06133-00

Failure code [CA222] Ambient Press Sens Low Error

Action
Failure code
level
L03 CA222
q
Detail of failure Low voltage appears in signal circuit of ambient pressure sensor.
Action of con-
q
Takes ambient pressure to be at fixed value and allows engine to run.
troller
q
Problem on Engine output lowers.
q
machine Engine starting performance becomes deteriorated.
q
Input voltage from ambient pressure sensor can be checked with monitoring function.
(Code: 37401 (V))
Related infor- q Ambient pressure sensed by ambient pressure sensor can be checked with monitoring function.
mation (Code: 37400 (kPa))
q
If sensor connector is disconnected, this failure code is displayed.
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective wiring harness connec-
1
tor
Defective power supply system of
2
ambient pressure sensor
Short circuit in wiring harness
3 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
4
(contact with ground circuit)
5 Short circuit in wiring harness
42
40-301
Ambient Pressure Sensor Low Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
See descriptions of wiring harness and connectors in "c: Electrical equipment"
in "Checks before troubleshooting" of "General information on troubleshoot-
ing", and check them.
If failure code [CA352] or [CA386] is also displayed, perform troubleshooting
for it first.
1. Turn starting switch to OFF position.
2. Disconnect connector AMB. AIR PRESSURE and connect T-adapter to
female side.
3. Turn starting switch to ON position.
Between AMB. AIR PRESSURE
(female) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connectors AMB. AIR PRESSURE and ECM, and connect
T-adapters to each female side.
a If power supply input in checks on cause 2 is nor-
mal, this check is not required.
Between ECM (female) (33) and AMB. AIR
PRESSURE (female) (1)
a If power supply input in checks on cause 2 is nor-
mal, this check is not required.
Between ECM (female) (38) and AMB. AIR
PRESSURE (female) (2)
Between ECM (female) (3) and AMB. AIR PRES-
SURE (female) (3) (sensor output)
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and AMB. AIR PRESSURE, and connect
T-adapters to either female side.
Between ECM (female) (3) and ground, or between
AMB. AIR PRESSURE (female) (3) and ground
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and AMB. AIR PRESSURE, and connect
T-adapters to either female side.
Between ECM (female) (3) and (38), or between
AMB. AIR PRESSURE (female) (2) and (3)
301 Troubleshooting by failure code, Part 1

Failure code [CA222] Ambient Press Sens Low Error

Power sup-
ply input
PC200, 200LC, 220, 220LC-8M0
4.75 to
Voltage
5.25 V
Resistance Max. 10 z
Resistance Max. 10 z
Resistance Max. 10 z
Resistance Min. 100 kz
Resistance Min. 100 kz