Komatsu PC200-8M0, Shop Manual, Page: 876 / 1254

400 Troubleshooting of electrical system (E-mode)
E-34 ATTACHMENT indicator is not displayed properly with monitoring function
40-400
54
PC200, 200LC, 220, 220LC-8M0
SEN06138-00
Note 1: If "Service" operation signal displayed on monitoring screen is "OFF" while voltage between C01 (52)
and ground is below 1 V, pump controller is defective.
Note 2: If "Service" operation signal displayed on monitoring screen is "ON" while voltage between C01 (52)
and ground is approximately 7 V, pump controller is defective.
Circuit diagram related to attachment control pedal PPC oil pressure switch (service pressure switch)
Cause Procedure, measuring location, criteria and remarks
4
Open circuit in wiring harness
(wire breakage or defective con-
tact of connector)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01, P14, and P15, and connect T-adapters to
each female side.
Between C01(female) (76) and P14(female) (1) Resistance Max. 1
z
Between C01(female) (76) and P15(female) (1) Resistance Max. 1
z
Between P14 (female) (2) and ground (T06) Resistance Max. 1
z
Between P15 (female) (2) and ground (T06) Resistance Max. 1
z
5
Ground fault in wiring harness
(contact with ground circuit)
1. Turn starting switch to OFF position.
2. Disconnect connectors C01, P14, and P15, and connect T-adapters to
either female side.
Between ground C01 (female) (76), P14 (female)
(1) or P15 (female) (1)
Resistance Min. 1 M
z
6 Short circuit in wiring harness
1. Turn starting switch to OFF position.
2. Disconnect connectors P14 and P15, and connect T-adapters to either
female side.
3. Turn starting switch to ON position.
Between P14 (female) (1) and ground, or between
P15 (female) (1) and ground
Voltage Approx. 7 V
7 Defective pump controller
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)