Failure Code [Ca153] Charge Air Temperature Sensor High Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA153] Charge Air Temperature Sensor High Error

CA153-400-A-Z0-A)
Action level Failure code
L03 CA153
Detail of
High voltage occurs in signal circuit of charge (boost) temperature sensor.
failure
Takes charge temperature (boost temperature) to be fixed value (46°C), and runs engine.
Action of
Closes EGR valve and opens variable flow turbocharger fully.
controller
Limits engine output and runs engine.
Engine starting performance is deteriorated at low temperatures.
Problem on
Engine output lowers.
machine
Signal voltage from charge temperature sensor (boost temperature sensor) can be
checked with monitoring function. (Code: 18501 (V))
Temperature sensed by charge temperature sensor (boost temperature sensor) can be
checked with monitoring function. (Code: 18500 (°C))
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 connectable to female connector on sensor wiring harness side and thus
not usable for check of open circuit (not designed as T-adapter).
This failure code appears if sensor connector is disconnected.
No. Cause
Defective wiring
1
harness connector
Defective charge
2
temperature sensor
Open or short circuit in
3
wiring harness
Defective engine
4
controller
PC88MR-10
Charge Air Temperature 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 "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.
1. Turn starting switch to OFF position.
2. Disconnect connector TMAP and connect socket to male side.
a Regard charge temperature sensor as normal if its resistance is 80 z to 48
kz (-40°C to -130°C).
Between TMAP (male) (3) and (4)
Resistance
a Charge temperature-Resistance
characteristics
1. Turn starting switch to OFF position.
2. Disconnect connector J1 and connect T-adapter to female side.
Between J1 (female) (5) and (59)
a Use Charge temperature-Resistance
Resistance
characteristics table for check on cause 2 as
resistance criteria.
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-
-40°C 41 to 48 kz
-20°C 14 to 16 kz
5.4 to 6.1
0°C
kz
1.6 to 1.8
30°C
kz
560 to 600
60°C
z
230 to 250
90°C
z
130°C 80 to 90 z
80 z to 48
kz
40-141