Failure Code [Ca132] Throttle Sensor Low Error - Komatsu WA250-6 Shop Manual

SEN03842-00

Failure code [CA132] Throttle sensor low error

Action code Failure code
E03
Contents of
• Low voltage was detected in the throttle sensor signal circuit.
trouble
Action of • Runs the engine at position of throttle 0% when accelerator pedal is OFF and at 50% when it is ON.
controller
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
appears on
• The engine does not reach full throttle.
machine
• The input state (accelerator pedal opening ratio) from the throttle sensor can be checked with the
monitoring function (Code: ENGINE, 31701, THROTTLE POS).
Related
• The input state (voltage) from the throttle sensor can be checked with the monitoring function (Code:
information
ENGINE, 31707, THROTTLE POS).
• Method of reproducing failure code: Turn the starting switch ON.
Defective throttle sensor
1
power supply system
Defective accelerator pedal
2
(Internal trouble)
Ground fault in wiring har-
ness
3
(Short circuit with ground cir-
Possible causes
cuit)
and standard
value in normal
state
Short circuit in wiring har-
4 ness
(with another wiring harness)
Defective wiring harness
5
connector
6 Defective engine controller
12
40-320
Trouble
CA132
Causes
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA132] Throttle sensor low error
Throttle sensor low error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
If failure code [CA2186] is indicated simultaneously, carry out trou-
bleshooting for it first.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
PD1
Between (1) and (3)
Between (2) and (3)
Sensor voltage is measured with wiring harness connected. Accord-
ingly, if voltage is abnormal, check wiring harness and controller for
another cause of trouble before judgment
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC2 (female) (9) –
PD1 (female) (2) and ground
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC2 (female) (9) –
PD1 (female) (2), EC2 (female) (23) – PD1
(female) (3)
Connecting parts among fuel control dial, engine unit wiring har-
ness, and engine controller are suspected. Inspect them directly.
• Loose connector, broken lock, broken seal
• Corrosive, bent, broken, forced-in, or extended pin
• Humidity in connector, entry of dirt or dust, poor insulation
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
EC2
Between (22) and
(23)
Between (9) and (23)
Accelerator pedal
All range
(Power supply)
When released
When pressed
Resis-
tance
Resis-
tance
Accelerator pedal
All range
(Power supply)
When released
When pressed
WA250, 250PZ-6
1
Voltage
4.75 – 5.25 V
0.50 – 0.80 V
3.70 – 4.00 V
Min.
100 kz
Min.
100 kz
Voltage
4.75 – 5.25 V
0.50 – 0.80 V
3.70 – 4.00 V