Failure Code [Ca154] Chg Air Temp Sensor Low Error - Komatsu PC200-8M0 Shop Manual

SEN06133-00

Failure code [CA154] Chg Air Temp Sensor Low Error

Action
Failure code
level
L03 CA154
q
Detail of failure Low voltage appears in temperature signal circuit of charge (boost) pressure & temperature sensor.
Action of con-
q
Takes boost temperature to be at fixed value and allows engine to run.
troller
Problem on
q
Engine protection function based on boost temperature does not work.
machine
q
Input voltage from boost temperature sensor can be checked with monitoring function.
(Code: 18501 (V))
q
Temperature sensed by boost temperature sensor can be checked with monitoring function.
Related infor-
(Code: 18500(°C))
mation
q
If temperature sensor connector is disconnected, this failure code is not displayed but failure code
[CA153] for "High Error" is displayed.
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective wiring harness connec-
1
tor
Defective charge temperature sen-
2
sor
3 Short circuit in wiring harness
Ground fault in wiring harness
4
(contact with ground circuit)
5 Defective engine controller
34
40-301

Failure code [CA154] Chg Air Temp Sensor Low Error

Charge Air Temperature 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.
1. Turn starting switch to OFF position.
2. Disconnect connector BOOST PRESS & IMT, and connect socket to male
side.
Between BOOST
PRESS & IMT (male) (3)
and (4)
a Boost
tempera-
ture-Resistance cha-
riacteristic
1. Turn starting switch to OFF position.
2. Disconnect connector ECM and connect T-adapters to female side.
Between ECM (female) (23) and (47)
a Use "Boost temperature-Resistance character-
istics" table shown above as resistance criteria.
a If no failure is found in checks on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors ECM and BOOST PRESS & IMT, and connect
T-adapter to female side of ECM.
Between ECM (female) (23) and ground
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
301 Troubleshooting by failure code, Part 1
-40 °C Resistance
-20 °C Resistance
0 °C Resistance
30 °C Resistance
60 °C Resistance
90 °C Resistance
130 °C Resistance
Resis-
Resis-
PC200, 200LC, 220, 220LC-8M0
41 to 48 kz
14 to 16 kz
5.4 to 6.1 kz
1.6 to 1.8 kz
560 to 600 z
230 to 250 z
80 to 90 z
80 z to 48 kz
tance
Min. 100 kz
tance