Failure Code [Ca431] Idle Validation Switch Error - Komatsu WA250-6 Shop Manual

SEN03843-00

Failure code [CA431] Idle validation switch error

Action code Failure code
E01
Contents of
• Abnormality occurred in idle validation switch circuit
trouble
Action of
• Operates at position of throttle of throttle sensor.
controller
Problem that
appears on —
machine
• The input state (ON/OFF) from the idle validation switch 1 can be checked with the monitoring func-
tion (Code: ENGINE, 18300, IVS 1).
Related
• The input state (ON/OFF) from the idle validation switch 2 can be checked with the monitoring func-
information
tion (Code: ENGINE, 18301, IVS 2).
• Method of reproducing failure code: Turn the starting switch ON.
Defective accelerator pedal
1
(Internal trouble)
Disconnection in wiring har-
ness
Possible causes
2
(Disconnection or defective
and standard
contact in connector)
value in normal
state
Short circuit in wiring har-
3 ness
(with another wiring harness)
8
40-330
Trouble
CA431
Causes
330 Troubleshooting by failure code (Display of code), Part 3
Failure code [CA431] Idle validation switch error
Idle validation switch error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
PD1
Between (5) and (4)
Between (6) and (4)
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) (11) –
PD1 (female) (5)
Wiring harness between EC2 (female) (1) –
PD1 (female) (6)
Wiring harness between EC2 (female) (32) –
PD1 (female) (4)
Wiring harness between EC2 (female) (21) –
PD2 (female) (1)
Wiring harness between EC2 (female) (29) –
PD2 (female) (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between EC2
(female) (11) – EC2 (female) (PD1 and 2,
too, is disconnected.)
Wiring harness among all pins between EC2
(female) (1) – EC2 (female) (PD1 and 2, too,
is disconnected.)
Between EC2 (female) (11) – EC3 (female)
(3), (4) (PD1 and 2, too, is disconnected.)
Between EC2 (female) (1) – EC3 (female)
(3), (4) (PD1 and 2, too, is disconnected.)
Signal name
Signal 1
See Fig. 1
Signal 2
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
Resis-
tance
WA250, 250PZ-6
1
Voltage
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Min.
100 kz
Min.
100 kz
Min.
100 kz
Min.
100 kz