Failure Code [Ca154] Charge Air Temperature Sensor Low Error - Komatsu PC88MR-10 Shop Manual

Failure code [CA154] Charge Air Temperature Sensor Low Error

CA154-400-A-Z0-A)
Action level Failure code
L03 CA154
Detail of
Low 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
Related
checked with monitoring function. (Code: 18500 (°C))
information
Method of reproducing failure code: Turn starting switch to ON position.
If temperature sensor connector is disconnected, failure code [CA153] for "High error" is
displayed in place of this failure code.
No. Cause
Defective wiring
1
harness connector
Defective charge
2
temperature sensor
Short circuit in wiring
3
harness
Ground fault in wiring
harness
4
(contact with ground
circuit)
Defective engine
5
controller
PC88MR-10
Charge Air Temperature 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.
1. Turn starting switch to OFF position.
2. Disconnect connector TMAP and connect socket to male side.
a If charge temperature sensor has resistance of 80 z to 43 kz (-40°C to
-130°C), regard charge temperature sensor as normal.
Between TMAP (male) (3) and (4)
a Charge temperature-Resistance
Resistance
characteristics
Between TMAP (male) (3) and ground
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.
1. Turn starting switch to OFF position.
2. Disconnect connectors J1 and TMAP, and connect T-adapter to female
side of connector J1.
Resistance Between J1 (female) (5) and ground
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
Whole
Min. 1 Mz
range
80 z to 43
kz
Min. 1 Mz
40-143