Failure Code [Ca435] Engine Oil Pressure Switch Error - Komatsu WA250-6 Shop Manual

SEN03843-00

Failure code [CA435] Engine oil pressure switch error

Action code Failure code
E01
Contents of
• Abnormality occurred in engine oil pressure switch signal circuit.
trouble
Action of
• None in particular.
controller
Problem that
• Engine oil switch-based engine protection function does not function.
appears on
• Engine oil pressure monitor does not indicate normally.
machine
Related
• Method of reproducing failure code: Starting switch ON or start engine
information
Defective engine oil pressure
1
switch
Disconnection in wiring har-
ness
2
(Disconnection or defective
contact in connector)
Possible causes
and standard
Short circuit in wiring har-
value in normal
3 ness
state
(with another wiring harness)
Defective wiring harness
4
connector
5 Defective engine controller
Related circuit diagram
16
40-330
Trouble
CA435
Causes
330 Troubleshooting by failure code (Display of code), Part 3
Failure code [CA435] Engine oil pressure switch error
Engine oil pressure switch error
(Engine controller system)
Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
OIL PRESSURE SWITCH (male)
Between OIL PRESURE
SWITCH (male) and body
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness between EC1 (female) (17) –
OIL PRESSURE SWITCH (female)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Wiring harness among all pins between EC1
(female) (17) – EC1 (female) (With all con-
nectors of wiring harness disconnected)
Connecting parts among engine oil pressure switch, engine wiring
harness, 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 carry out troubleshooting
without turning starting switch ON.
EC1 (female)
Between (17) and ground
1
Resistance
Max. 10 z
Resis-
Max. 10 z
tance
Resis- Min.
tance 100 kz
Resistance
Max. 10 z
WA250, 250PZ-6