Failure Code [Dxa9Kb] Pc-Epc (R) Sol Short Circuit - Komatsu PC200-8M0 Shop Manual

SEN06137-00

Failure code [DXA9KB] PC-EPC (R) Sol Short Circuit

Action
Failure code
level
L03 DXA9KB
q
Detail of failure When PC-EPC (Rear) solenoid is driven, abnomal current flows and short circuit is detected.
q
Cuts output to PC-EPC (R) solenoid OFF.
Action of con-
q
Even if cause of failure disappears, machine does not become normal until starting switch is turned
troller
to OFF position.
Problem on
q
If pump load increases, engine speed decreases largely and engine may stall.
machine
q
When solenoid and wiring harness are normal, engine can be prevented from stalling by setting
emergency pump drive switch to ON position.
Related infor-
q
Drive current of PC-EPC (R) solenoid can be checked with monitoring function.
mation
(Code: 01300 PC-EPC solenoid current (R))
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause
Defective PC-EPC (R) solenoid
1 (internal short circuit or ground
fault)
Defective emergency pump drive
2 switch (internal short circuit or
ground fault)
Short circuit or ground fault in wir-
3
ing harness
Ground fault in wiring harness
4
(contact with ground circuit)
5 Defective pump controller
22
40-305
PC-EPC (Rear) Solenoid System Short Circuit
Failure
(Pump controller system)
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector V12, and connect T-adapters to male side.
Between V12 (male) (1) and (2)
Between V12 (male) (1) and ground
1. Turn starting switch to OFF position.
2. Disconnect connector S25 and connect T-adapters to male side.
Between S25 (male) and each of S25
(male) (2) and (3)
Between ground and each of S25
(male) (2) and (3)
1. Turn starting switch to OFF position.
2. Disconnect connector C02 and connect T-adapters to female side.
a Check that emergency pump drive switch is at normal position (lower side).
Between C02 (female) (96) and each of (115), (117)
and (120)
Between C02 (female) (96) and ground
a If no failure is found in checks on cause 3, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors C02, S25 and V12, and connect T-adapters to
either female side.
Between C02 (female) (96) or S25 (female) (3) and
ground
Between ground and S25 (female) (5) or V12
(female) (2)
If no failure is found by above checks, pump controller is defective. (Since this
is an internal defect, troubleshooting cannot be performed.)
305 Troubleshooting by failure code, Part 5
Failure code [DXA9KB] PC-EPC (R) Sol Short Circuit
Switch posi-
tion: Normal
PC200, 200LC, 220, 220LC-8M0
3 to 14 z
Resistance
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
3 to 14 z
Resistance
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz