Komatsu PC200-8M0, Shop Manual, Page: 859 / 1254

SEN06138-00
PC200, 200LC, 220, 220LC-8M0 40-400
37
400 Troubleshooting of electrical system (E-mode)
E-20 Any of work equipment, swing and travel do not operate or cannot be locked
E-20 Any of work equipment, swing and travel do not operate or cannot
be locked
Failure 1) All of work equipment, swing, and travel mechanism do not move.
Related infor-
mation
Cause Procedure, measuring location, criteria and remarks
1 Defective fuse F01-3 If fuse is blown, circuit probably has grounding fault. (See Cause 6.)
2
Defective lock lever
switch (internal open cir-
cuit)
1. Turn starting switch to OFF position.
2. Disconnect connector S14 and connect T-adapters to female side.
Between S14 (male) (1) and
(2)
Lock lever: LOCK Resistance Min. 1 M
z
Lock lever: FREE Resistance Max. 1
z
3
Defective PPC lock sole-
noid (open or short circuit
in internal wiring)
1. Turn starting switch to OFF position.
2. Disconnect connector V01 and connect T-adapters to male side.
Between V01 (male) (1) and (2) Resistance 20 – 60
z
Between V01 (male) (1) and ground Resistance Min. 1 M
z
4
Defective diode array D01
(Internal short circuit)
1. Turn starting switch to OFF position.
2. Remove diode array D01 and connect T-adapters to male side.
a
Check the continuity in diode range.
Between D01 (male) (8) (+) and (4) (-) Continuity
Between D01 (male) (4) (+) and (8) (-) No continuity
5
Open circuit in wiring har-
ness
(wire breakage or defec-
tive contact of connector)
1. Turn starting switch to OFF position.
2. Set lock lever to FREE position.
3. Remove fuse F01-3.
Between F01-3 and ground (coil resistance of PPC lock
solenoid)
Resistance 20 – 60
z
a
If no failure is found by above check, this check is not required.
1. Turn starting switch to OFF position.
2. Remove fuse F01-3.
3. Disconnect connectors S14 and V01 and then connect T-adapters to male side of
S14 and female side of V01.
Between F01-3 and S14 (male) (1) Resistance Max. 1
z
Between S14 (male) (2) and V01 (female) (1) Resistance Max. 1
z
Between V01 (female) (2) and ground (T09) Resistance Max. 1
z
6
Ground fault in wiring har-
ness
(contact with ground cir-
cuit)
1. Turn starting switch to OFF position.
2. Remove fuse F01-3.
3. Disconnect connectors S14, V01, and D01, and then connect T-adapters to male
side of S14 or female side of V01 or D01.
Between ground and F01-3 or S14 (male) (1) Resistance Min. 1 M
z
Between ground and S14 (male) (2), V01 (female) (1) or
D01 (female) (4)
Resistance Min. 1 M
z