E-30 Any Of Work Equipment, Swing And Travel Does Not Work - Komatsu PC88MR-10 Shop Manual

E-30 Any of work equipment, swing and travel does not work

Z0-A)
None of work equipment, swing or travel works.
Failure
Related
information
No. Cause
Defective fuse No. 3 of
1
F01
Defective PPC lock
lever relay
2
(Internal open or short
circuit)
Defective PPC lock
switch
3
(Internal open circuit)
Defective PPC lock
solenoid
4
(Internal open, short
circuit, or ground fault)
Defective diode array
D01
5
(Internal ground fault)
Open or short circuit in
6
wiring harness
Open circuit in wiring
7
harness
PC88MR-10
Procedure, measuring location, criteria, and remarks
If fuse is burnt out, circuit may have ground fault, etc. (See check on Cause
8.)
1. Turn starting switch to OFF position.
2. Replace PPC lock lever relay R12 with R08
3. Start engine.
4. Set the lock lever to FREE position.
If work equipment moves, original PPC lock lever relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect connector S14 and connect T-adapter to female side.
3. Operate lock lever and perform troubleshooting.
Resistance Between S14 (female) (1) and (2)
1. Turn starting switch to OFF position.
2. Disconnect connector V01 and connect T-adapter to male side.
Between V01 (male) (1) and (2)
Resistance
Between V01 (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector D01 and connect T-adapter to male side.
a Measure it with diode range of multimeter.
Continuity Between D01 (male) (8) (+) and (4) (-)
Continuity Between D01 (male) (4) (+) and (8) (-)
1. Turn starting switch to OFF position.
2. Remove fuse No. 3.
3. Set PPC lock switch to FREE position.
Between fuse F01-3 outlet and ground
Resistance
a Resistance of PPC lock solenoid
a If no failure is found by check on Cause 5, this check is not required.
1. Turn starting switch to OFF position.
2. Remove fuse No. 3.
3. Disconnect connectors S14, V01, R12, and CP02, and connect T-adapter
to each female side.
Between V01 (female) (2) and ground
Between V01 (female) (1) and R12 (female) (5)
Between R12 (female) (3) and S14 (male) (2)
Resistance
Between fuse F01-3 outlet and S14 (male) (1)
Between R12 (female) (1) and CP02 (female) (99)
40 Troubleshooting
Troubleshooting of electrical system (E-mode)
FREE
LOCK
(PC88MR-FT5-400-A-
Max. 1 z
Min. 1 Mz
20 to 60 z
Min. 1 Mz
Continuity
No
continuity
20 to 60 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
40-419