One-Touch Power Maximizing System Does Not Operate - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING
E-9 One-touch power maximizing system does not operate
Trouble

• One-touch power maximizing system does not operate.

Related • The input state (ON/OFF) from the one-touch power maximizing switch (left knob switch) can be
information checked with the monitoring function. (Code: 022, Center of upper line)
1 Defective fuse No. 9
Defective one-touch power
2 maximizing switch
(Internal disconnection)
Disconnection in wiring
harness
3 (Disconnection in wiring
Possible causes
harness or defective
and standard
contact in connector)
value in normal
state
Short circuit with chassis
ground in wiring harness
4
(Contact with ground
circuit)
Defective governor and
5
pump controller
Circuit diagram related to one-touch power maximizing switch
20-420
(1)
Cause Standard value in normal state/Remarks on troubleshooting
If the fuse is broken, the circuit probably has a grounding fault, etc.
(See cause 4.)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
M23 (male)
Between (1) and (4)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between FB1-9 outlet and M23
(female) (1)
Wiring harness between M23 (female) (4) and
C01 (female) (1)
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Between FB1-9 outlet – M23 (female) (1) wiring
harness and chassis ground
Between M23 (female) (4) – C01 (female) (1)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between (11) and
chassis ground
One-touch power
maximizing switch
Released
Pressed
One-touch power
C01
maximizing switch
Released
Pressed
E-9
Resistance
Min. 1 Mz
Max. 1 z
Max. 1 z
Resistance
Max. 1 z
Resistance
Resistance Min. 1 Mz
Min. 1 Mz
Resistance
Voltage
Max. 1 V
20 – 30 V
PC130-7