Komatsu WA900-3E0 User Manual

Troubleshooting by failure code
Failure code [DDB6KZ] (Parking brake system abnormality)
WA900-3E0
Failure code [DDB6KZ] (Parking brake system abnormality) 40-31
Action level Failure code
Failure Parking brake system malfunction
E01 DDB6KZ
Detail of failure
q Parking brake pressure remains off for 10 seconds (parking brake is kept released) while parking
brake switch is pressed (to apply parking brake).
Action of con-
troller
q (None in particular)
Problem on
machine
q Machine may move off since parking brake is not applied (is released) while parking brake switch
is pressed (to apply parking brake).
Related infor-
mation
q Input signal from parking brake switch can be checked with monitoring function.
Code: 40989 "D-IN-7" (ON: 1 (Released), OFF: 0 (Applied).
q Input signal from parking brake pressure switch can be checked with monitoring function.
Code: 40989 "D-IN-4" (ON: 1 (Released), OFF: 0 (Applied).
q If parking brake is not applied, see E-mode troubleshooting..
No. Cause Procedure, measuring location, criteria and remarks
1
Hot short circuit in wiring harness
(short to 24 V circuit)
1. Turn starting switch to OFF position.
2. Connect T-adapter to PC0.
3. Turn starting switch to ON position and then perform troubleshooting.
Voltage
Between PC0 (37) and (32)
Min. 18 V when parking
brake is released
Between PC0 (37) and (32)
Max. 1 V
when parking brake is
applied
2
Ground fault in wiring harness
(short to ground circuit)
1. Turn starting switch to OFF position.
2. Connect T-adapter to PC0.
3. Turn starting switch to ON position and then perform troubleshooting.
a Check interlock function when releasing parking brake.
Voltage
Between PC0 (35) and ground
Max. 1 V
when parking brake is
released
Between PC0 (35) and (32)
Max. 1 V
when parking brake is
released
Between PC0 (35) and ground
Min. 5 V
when parking brake is
applied
Between PC0 (35) and (32)
Min. 5 V
when parking brake is
applied
3
Defective parking brake pressure
switch
(internal open circuit)
1. Turn starting switch to OFF position.
2. Disconnect F12.
Resistance
Between F12 (female) (1) and F12 (2)
Max. 1 z when parking
brake is applied
Between F12 (female) (1) and F12 (2)
Min. 1 Mz when parking
brake is released
40-31

Komatsu WA900-3E0 Specifications

General

Brand	Komatsu
Model	WA900-3E0
Category	Excavators
Language	English