Komatsu PC88MR-10 Shop Manual page 517

Check the connection of engine controller (EC)
ground (T15A) and between engine controller
mounting bracket and frame (2).
c9. Check for loose connector and damaged
lock
Check the connection of male and female
connectors by pulling them by hand.
If the connection is loose, secure it.
Check the connectors for unlocking, and check
the lock and connector housing for cracking.
Check lock screws (L) of engine controller (EC)
for looseness.
a Use a hexagonal wrench with 4 mm width
across flats.
c10. Check the connector pins for corrosion,
bending and deformation
PC88MR-10
Related information on troubleshooting
Disconnect the connectors, and check their pins
for corrosion, bending, sinking than other pins,
and extension of female pins.
If pins are defective, repair or replace them.
a If the pins are not shiny, apply contact restorer to
them and connect and disconnect the
connectors several times to shine them. (If the
pins do not become shiny, connect and
disconnect the connectors 10 times)
c11. Check of connector for entering of water
and foreign material inside the connector
Disconnect connectors, and check them for
entering of water or foreign material inside the
connector.
a If there is entering of water or foreign material
inside connector, the seals may be damaged.
Check the seals for damage.
If the seal is defective, repair or replace it.
Dry the inside of the connector with a dryer.
Wipe and remove any foreign material inside
connector with a cloth or others, and blow the air
to clean the connector.
40 Troubleshooting
40-29