Failure Code [Ca435] Engine Oil Pressure Sw Error - Komatsu PC88MR-10 Shop Manual

40 Troubleshooting
Troubleshooting by failure code (Display of code)

Failure code [CA435] Engine Oil Pressure SW Error

Action level Failure code
L01 CA435
Detail of
Failure occurs in engine oil pressure switch signal circuit.
failure
Action of
None in particular
controller
Protection function based on engine oil pressure does not work.
Problem on
Engine oil pressure monitor is not displayed normally.
machine
Method of reproducing failure code: Turn starting switch to ON position or start engine.
Engine oil pressure switch is in CLOSED (ON) when oil pressure is low (when engine is
stopped), but is in OPEN (OFF) when oil pressure is high (when engine is running).
To generate this failure code, engine controller checks whether engine oil pressure switch
is in CLOSED (ON) only when engine is stopped, that is, whether signal voltage is zero or
Related
not.
information
Failure of engine oil pressure switch with engine running is shown by failure code
[B@BAZG].
When performing checking and replacement of engine oil pressure switch, open oil
filler port, and check that engine oil temperature cools down enough not to get
scalded.
No. Cause
Defective wiring
1
harness connector
Defective engine oil
2
pressure switch
Open or short circuit in
3
wiring harness
Defective engine
4
controller
Circuit diagram related to engine oil pressure switch
40-174
Engine Oil Pressure Switch Error
Failure
(Engine controller system)
Procedure, measuring location, criteria and remarks
1. See descriptions of wiring harness and connectors in "c: Electrical
equipment" in "Checks before troubleshooting" of "Related information on
troubleshooting", and check it.
2. Turn starting switch to ON position.
If this failure code is not displayed, wiring harness connector is defective.
a If this failure code is displayed, perform following checks.
1. Turn starting switch to OFF position.
2. Disconnect connector POIL, and connect T-adapter to male side.
Resistance Between POIL (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector J1 and connect T-adapter to female side.
Resistance Between J1 (female) (31) and ground
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
(PC88MR-CA435-400-A-Z0-A)
Max. 1 z
Max. 1 z
PC88MR-10