Komatsu 75001, Shop Manual

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SEN03842-00
40-320
12
WA250, 250PZ-6
320 Troubleshooting by failure code (Display of code), Part 2
Failure code [CA132] Throttle sensor low error
Failure code [CA132] Throttle sensor low error
1
Action code Failure code
Trouble
Throttle sensor low error
(Engine controller system)
E03 CA132
Contents of
trouble
• Low voltage was detected in the throttle sensor signal circuit.
Action of
controller
• Runs the engine at position of throttle 0% when accelerator pedal is OFF and at 50% when it is ON.
• Turns the centralized warning lamp and alarm buzzer ON.
Problem that
appears on
machine
• The engine does not reach full throttle.
Related
information
• The input state (accelerator pedal opening ratio) from the throttle sensor can be checked with the
monitoring function (Code: ENGINE, 31701, THROTTLE POS).
• The input state (voltage) from the throttle sensor can be checked with the monitoring function (Code:
ENGINE, 31707, THROTTLE POS).
• Method of reproducing failure code: Turn the starting switch ON.
Possible causes
and standard
value in normal
state
Causes Standard value in normal state/Remarks on troubleshooting
1
Defective throttle sensor
power supply system If failure code [ CA2186 ] is indicated simultaneously, carry out trou-
bleshooting for it first.
2
Defective accelerator pedal
(Internal trouble)
a
Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
PD1 Accelerator pedal Voltage
Between (1) and (3)
All range
(Power supply)
4.75 – 5.25 V
Between (2) and (3)
When released 0.50 – 0.80 V
When pressed 3.70 – 4.00 V
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
3
Ground fault in wiring har-
ness
(Short circuit with ground cir-
cuit)
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 Resis-
tance
Min.
100 k z
4
Short circuit in wiring har-
ness
(with another wiring harness)
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)
Resis-
tance
Min.
100 k z
5
Defective wiring harness
connector
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
6 Defective engine controller
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
EC2 Accelerator pedal Voltage
Between (22) and
(23)
All range
(Power supply)
4.75 – 5.25 V
Between (9) and (23)
When released 0.50 – 0.80 V
When pressed 3.70 – 4.00 V