Work Equipment Does Not Operate While Lock Lever Automatic Release Switch Is In Release Position - Komatsu PC88MR-10 Shop Manual

E-34 Work equipment does not operate while lock lever automatic
release switch is in release position
Work equipment does not operate while lock lever automatic release switch is in release
Failure
position.
Related
information
No. Cause
Defective fuse No. 3 of
1
F01
2 Defective switch
Defective diode array
D03
3
(Internal ground fault)
Open circuit in wiring
4
harness
Pump controller is
5
defective.
Ground fault in wiring
harness
6
(Contact with ground
circuit)
PC88MR-10
Procedure, measuring location, criteria, and remarks
If fuse is burnt out, circuit may have ground fault, etc. (See check on Cause
6.)
1. Turn starting switch to OFF position.
2. Disconnect connector S25 and connect T-adapter to male side.
Between S25 (male) (8)
Resistance
and (7)
1. Turn starting switch to OFF position.
2. Disconnect diode array D03 and connect T-adapters to male side.
a Measure it with diode range of multimeter.
Between D03 (male) (7) (+) and (3) (-)
Continuity
Between D03 (male) (3) (+) and (7) (-)
1. Turn starting switch to OFF position.
2. Disconnect connectors S25 and CP01 and connect T-adapters to each
female side.
Resistance Between CP01 (female) (22) and S25 (female) (8)
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
a If no failure is found by check on cause 1, this check is not required.
1. Turn starting switch to OFF position.
2. Remove fuse No. 3.
3. Disconnect connectors S14, D03, V01, and S25, and then connect T-
adapter to male side of S14 or female side of V01.
Between ground and V01 (female) (1) or S25
(female) (8)
Between ground and S14 (male) (1) or S25
Resistance
(female) (7)
Between S14 (male) (1) and ground
Troubleshooting of electrical system (E-mode)
(PC88MR-K1V-400-A-Z0-A)
Lock lever automatic
lock cancel switch:
Normal
Lock lever automatic
lock cancel switch: Error
40 Troubleshooting
Min 1 Mz
Max. 1 z
Continuity
No
continuity
Max. 1 z
Min 1 Mz
Min 1 Mz
Min 1 Mz
40-427