Failure Code [Ddb6Kz] (Parking Brake System Abnormality) - Komatsu WA900-3E0 Shop Manual

Failure code [DDB6KZ] (Parking brake system abnormality)

Action level Failure code
E01 DDB6KZ
Parking brake pressure remains off for 10 seconds (parking brake is kept released) while parking
q
Detail of failure
brake switch is pressed (to apply parking brake).
Action of con-
(None in particular)
q
troller
Problem on Machine may move off since parking brake is not applied (is released) while parking brake switch
q
machine is pressed (to apply parking brake).
Input signal from parking brake switch can be checked with monitoring function.
q
Code: 40989 "D-IN-7" (ON: 1 (Released), OFF: 0 (Applied).
Related infor-
Input signal from parking brake pressure switch can be checked with monitoring function.
q
mation
Code: 40989 "D-IN-4" (ON: 1 (Released), OFF: 0 (Applied).
If parking brake is not applied, see E-mode troubleshooting..
q
No. Cause
Hot short circuit in wiring harness
1
(short to 24 V circuit)
Ground fault in wiring harness
2
(short to ground circuit)
Defective parking brake pressure
3 switch
(internal open circuit)
WA900-3E0

Failure code [DDB6KZ] (Parking brake system abnormality)

Failure Parking brake system malfunction
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Connect T-adapter to PC0.
3. Turn starting switch to ON position and then perform troubleshooting.
Between PC0 (37) and (32)
Voltage
Between PC0 (37) and (32)
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.
Between PC0 (35) and ground
Between PC0 (35) and (32)
Voltage
Between PC0 (35) and ground
Between PC0 (35) and (32)
1. Turn starting switch to OFF position.
2. Disconnect F12.
Between F12 (female) (1) and F12 (2)
Resistance
Between F12 (female) (1) and F12 (2)
Troubleshooting by failure code
Min. 18 V when parking
brake is released
Max. 1 V
when parking brake is
applied
Max. 1 V
when parking brake is
released
Max. 1 V
when parking brake is
released
Min. 5 V
when parking brake is
applied
Min. 5 V
when parking brake is
applied
Max. 1 z when parking
brake is applied
Min. 1 Mz when parking
brake is released
40-31
4 0 - 3 1