Komatsu PC200-8M0 Shop Manual page 876

SEN06138-00
Cause
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
5
(contact with ground circuit)
6 Short circuit in wiring harness
7 Defective pump controller
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)
54
40-400
E-34 ATTACHMENT indicator is not displayed properly with monitoring function
Procedure, measuring location, criteria and remarks
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)
Between C01(female) (76) and P15(female) (1)
Between P14 (female) (2) and ground (T06)
Between P15 (female) (2) and ground (T06)
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)
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
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
400 Troubleshooting of electrical system (E-mode)
Resistance
Resistance
Resistance
Resistance
Resistance Min. 1 Mz
PC200, 200LC, 220, 220LC-8M0
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Voltage Approx. 7 V