Komatsu PC88MR-10 Shop Manual page 737

No. Cause
Ground fault in wiring
5
harness
Short circuit in wiring
6
harness
Defective machine
7
monitor
PC88MR-10
Procedure, measuring location, criteria, and remarks
a If no failure is found by check on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Remove fuse No. 3 in fuse box F01.
3. Disconnect connector CM01 and relay R07, and connect T-adapter to
either female side.
Between F01-3 or R07 (female) (1) and ground
Resistance Between R07 (female) (2) and ground, or between
CM01 (female) (6) and ground
1. Turn starting switch to OFF position.
2. Remove fuse No. 3 in fuse box F01.
3. Disconnect connectors CM01 and relay R07, and connect T-adapter to
female side of connector CM01.
a Check by using multimeter in continuity mode.
Between CM01 (female) (6) and each pin other
Continuity
than (6)
If no failure is found by above checks, machine monitor is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
Min. 1 Mz
Min. 1 Mz
No
continuity
(No sound
is heard.)
40-249