Komatsu SAA6D114E-3 - Code [431;CA431] Idle Validation Switch Error

SEN00460-01 40 Troubleshooting
12 114E-3 Series
E-33 Code [431/CA431] Idle Validation Switch Error 1
Error code Failure code
Trouble Abnormality in idle validation switch
431 CA431
Contents of trou-
ble
• Abnormality occurred in idle validation switch circuit
Action of
controller
• Sets throttle angle to certain value and continues operation (depending on each model).
Problem that
appears
on machine
• Engine speed may not rise from low idle.
Related informa-
tion
• Method of reproducing failure code: Starting switch ON, accelerator ON.
Possible
causes and
standard value
in normal state
Causes Standard value in normal state/Remarks on troubleshooting
1 Defective accelerator pedal
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
WAS1 (Male) Accelerator pedal Resistance
Between (5) – (4)
Release Max. 1 z
Press Min. 1 Mz
Between (6) – (4)
Release Min. 1 Mz
Press Max. 1 z
2
Disconnection in wiring har-
ness (Disconnection in wiring
or defective contact in con-
nector)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between J2 (female) (11) –
WAS1 (female) (5)
Resis-
tance
Max. 10 z
Wiring harness between J2 (female) (1) –
WAS1 (female) (6)
Resis-
tance
Max. 10 z
Wiring harness between J2 (female) (32) –
WAS1 (female) (4)
Resis-
tance
Max. 10 z
3
Short circuit in wiring harness
(With another wiring harness)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between J2
(female) (11) – J2 (female) (With also WAS1
disconnected)
Resis-
tance
Min.
100 kz
Wiring harness among all pins between J2
(female) (1) – J2 (female) (With also WAS1
disconnected)
Resis-
tance
Min.
100 kz
4
Defective wiring harness con-
nector
Connecting parts among accelerator pedal, 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
5 Defective engine controller
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
J2 (Female) Accelerator pedal Resistance
Between (11) – (32)
Release Max. 1 z
Press Min. 1 Mz
Between (1) – (32)
Release Min. 1 Mz
Press Max. 1 z