Upper Structure Does Not Swing While Swing Parking Brake Cancel Switch Is Set To Cancel Position - Komatsu PC88MR-10 Shop Manual

E-32 Upper structure does not swing while swing parking brake cancel
switch is set to CANCEL position
Upper structure does not swing while swing parking brake cancel switch is set to CANCEL
Failure
position.
Condition of swing lock switch signal can be checked with monitoring function.
Related
(Pump controller system code: 02200)
information
No. Cause
Defective fuse No. 1 in
1
fuse box F01
Defective swing parking
brake cancel switch
2
(internal short circuit)
Defective diode array
D01
3
(Internal short circuit)
Defective diode array
D03
4
(Internal short circuit)
Defective wiring
5
harness
Open circuit in wiring
harness
6
(Wire breakage or
defective contact of
connector)
Ground fault in wiring
harness
7
(Contact with ground
circuit)
PC88MR-10
(PC88MR-FGM-400-A-Z0-A)
Procedure, measuring location, criteria, and remarks
If fuse is burnt out, circuit probably has ground fault. In this case, perform
check on Cause 5 first.
1. Turn starting switch to OFF position.
2. Disconnect connector S25 and connect T-adapter to male side.
Between S25 (male) (13)
Resistance
and (14)
1. Turn starting switch to OFF position.
2. Remove diode array and connect T-adapter to male side.
a Measure it with diode range of multimeter.
Continuity Between D01 (male) (7) (+) and (3) (-)
Continuity Between D01 (male) (3) (+) and (7) (-)
1. Turn starting switch to OFF position.
2. Remove diode array and connect T-adapter to male side.
a Measure it with diode range of multimeter.
Continuity Between D03 (male) (5) (+) and (1) (-)
Continuity Between D03 (male) (1) (+) and (5) (-)
1. Turn starting switch to OFF position.
2. Disconnect connector V03 and connect T-adapter to female side.
3. Turn starting switch to ON position.
a Swing lock switch OFF position
Between V03 (female)
Voltage
(1) and (2)
a If no failure is found by check on Cause 5, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors V03 and S25 and connect T-adapters to each
male side.
a Swing lock switch OFF position
Between V03 (female) (1) and S25 (female) (8)
Resistance
Between V03 (female) (2) and ground
a If no failure is found by check on Cause 5, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors S25 and V03 and connect T-adapter to female side
of V03.
Resistance Between V03 (female) (1) and ground
40 Troubleshooting
Troubleshooting of electrical system (E-mode)
Swing parking brake
cancel switch: Normal
Swing parking brake
cancel switch: FREE
Swing parking brake
cancel switch: FREE
Swing parking brake
cancel switch: Normal
Min. 1 Mz
Max. 1 z
Continuity
No
continuity
Continuity
No
continuity
20 to 30 V
Max. 1 V
Max. 1 z
Max. 1 z
Min. 1 Mz
40-423