Power Maximizing Function Does Not Operate Normally - Komatsu PC130-8 Shop Manual

SEN04123-01
E-20 Power maximizing function does not operate normally
(1) When left knob switch is pressed, one-touch power maximizing monitor is not displayed.
Trouble
(2) When left knob switch is pressed, work equipment power is not increased.
• One-touch power maximizing function does not work when working mode is not power mode (P) or
Related infor- economy mode (E).
mation • Condition of left knob switch signal can be checked with monitoring function.
(Code: 02200 Switch input 1)
1 Defective fuse No. 9
Defective left knob switch
2
(Internal disconnection)
Disconnection in wiring har-
ness (Disconnection in wiring
3
or defective contact in con-
nector)
Possible causes
and standard
value in normal
state
Ground fault in wiring har-
4 ness (Short circuit with GND
circuit)
5 Defective pump controller
6 Defective machine monitor
Circuit diagram related
40
Cause Standard value in normal state/Remarks on troubleshooting
If fuse is broken, circuit probably has ground fault. (See cause 4.)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Between (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between F01-9 – S11
(female) (1)
Wiring harness between S11 (female) (2) –
CP01 (female) (41)
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
Wiring harness between F01-9 – S11
(female) (1) and chassis ground
Wiring harness between S11 (female) (2) –
CP01 (female) (41) and chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
ing without turning starting switch ON.
CP01 (female)
Between (41) –
chassis ground
Machine monitor may be defective. (Since trouble is in system,
troubleshooting cannot be carried out.)
S11 (male) Left knob switch
Released
Pressed
Left knob switch
Released
Pressed
40 Troubleshooting
1
Resistance
Min. 1 Mz
Max. 1 z
Resis-
Max. 1 z
tance
Resis-
Max. 1 z
tance
Resis-
Min. 1 Mz
tance
Resis-
Min. 1 Mz
tance
Resistance
Min. 1 Mz
Max. 1 z
PC130-8