Failure Code [Dkulkb] Ppc Lock Relay Short Circuit - Komatsu PC88MR-10 Shop Manual

Failure code [DKULKB] PPC Lock Relay Short Circuit

Action level Failure code
L03 DKULKB
Details of
Short circuit is detected when output to PPC lock relay (coil side) is ON.
failure
Stops output to PPC lock relay.
Action of
Even if cause of failure disappears, machine does not become normal until starting switch
controller
is turned to OFF position.
All work equipment, swing, and travel are not operated even when lock lever is in FREE
Problem on
position.
machine
Related
Method of reproducing failure code: Turn starting switch to ON position.
information
No. Cause
Defective PPC lock
1
relay
Ground fault in wiring
2
harness
Pump controller is
3
defective.
PC88MR-10
PPC Lock Relay Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect relay R12, and connect T-adapter to male side.
Resistance Between R12 (male) (1) and (2)
1. Turn starting switch to OFF position.
2. Replace relay R12 with another one.
3. Turn starting switch to ON position.
If this failure code disappears, original PPC lock relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect connector CP02 and relay R12, and connect T-adapter to
female side.
Between ground and CP02 (female) (99) or R12
Resistance
(female) (1)
If no failure is found by above checks, pump controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
(PC88MR-DKULKB-400-A-Z0-A)
300 to 600
z
Min 1 Mz
40-327