Komatsu PC200-8M0, Shop Manual, Page: 864 / 1254

400 Troubleshooting of electrical system (E-mode)
E-22 One-touch power maximizing function does not operate properly
40-400
42
PC200, 200LC, 220, 220LC-8M0
SEN06138-00
E-22 One-touch power maximizing function does not operate properly
Failure
1) When L.H. knob switch is pressed, one-touch power max. monitor is not displayed.
2) When L.H. knob switch is pressed, work equipment power is not increased.
Related information
q
One-touch power max. function does not operate when selected working mode is not power
mode (P) or economy mode (E).
q
Signal of L.H. knob switch can be checked with monitoring function.
(Code: 02200 Switch Input 1)
Cause Procedure, measuring location, criteria and remarks
1 Defective machine monitor
When L.H. knob switch is pressed, if work equipment power is increased but
one-touch power max. monitor is not displayed on machine monitor, machine
monitor may be defective. (Since this is an internal defect, troubleshooting can-
not be performed.)
2 Defective fuse No. 9 If fuse is blown, circuit probably has grounding fault. (See Cause 6.)
3
Defective left knob switch
(Internal open circuit)
1. Turn starting switch to OFF position.
2. Disconnect connector S11, and connect T-adapters to male side.
Between S11 (female) (1)
and (2)
L.H. knob switch:
Released
Resistance Min. 1 M
z
L.H. knob switch:
Pressed
Resistance Max. 1
z
4
Open circuit or ground fault in wir-
ing harness
1. Turn starting switch to OFF position.
2. Disconnect connector C01 and connect T-adapters to female side.
3. Turn starting switch to ON position.
a
Ignore displayed failure code.
Between C01 (female)
(41) and ground
L.H. knob switch:
Released
Voltage Max. 1 V
L.H. knob switch:
Pressed
Voltage 20 to 30
z
5
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
a
If no failure is found by check on cause 4, this check is not required.
1. Turn starting switch to OFF position.
2. Remove fuse F01-9.
3. Disconnect connectors C01 and S11 and connect T-adapters to each female
side.
Between F01-9 and S11 (female) (1) Resistance Max. 1
z
Between S11 (female) (2) and C01 (female) (41) Resistance Max. 1
z
6
Ground fault in wiring harness
(contact with ground circuit)
a
If no failure is found by check on cause 4, this check is not required.
1. Turn starting switch to OFF position.
2. Remove fuse F01-9.
3. Disconnect connectors C01 and S11 and connect T-adapters to female side
of S11.
Between F01-9 or S11 (female) (1) and ground Resistance Min. 1 M
z
Between S11 (female) (2) or C01 (female) (41) and
ground
Resistance Min. 1 M
z
7 Defective pump controller
If no failure is found by above checks, the pump controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)