Failure Code [D160Ky] Backup Alarm/Lamp Relay 1 Circuit: Hot Short - Komatsu WA250-6 Shop Manual

SEN03844-00

Failure code [D160KY] Backup alarm/lamp relay 1 circuit: Hot short

Action code Failure code
E01 D160KY
Contents of
• Since there is hot short in backup alarm/lamp relay 1 output system, backup lamp relay 1 does not
trouble
operate.
• Turns output to backup alarm/lamp relay 1 OFF.
Action of
• If hot short occurs while alarm buzzer is in operation, output is turned OFF.
machine monitor
• If hot short occurs while ECSS is in operation, output is turned OFF.
• Backup lamp is kept ON.
Problem that
• Backup alarm is kept ON.
appears on
• Alarm buzzer may not sound.
machine
• ECSS may not operate.
• Output state (ON/OFF) to backup alarm/lamp relay 1 can be checked with monitoring function.
(Monitoring code: MONITOR PANEL – 40952 – D-OUT-2)
• Operating condition of alarm buzzer can be checked with monitoring function.
Related (Monitoring code: MONITOR PANEL – 40952 – D-OUT-0)
information
• Operating condition of ECSS can be checked with monitoring function.
(Monitoring code: MONITOR PANEL – 40952 – D-OUT-3)
• Method of reproducing failure code: Turn starting switch ON + Set FNR (directional) lever or switch to
R (Reverse) position.
Defective backup alarm/lamp
1
relay (L109) (Internal defect)
Possible causes
and standard
value in normal
state
Hot short (Contact with 24V
2
circuit) in wiring harness
3 Defective machine monitor
2
40-340
Failure code [D160KY] Backup alarm/lamp relay 1 circuit: Hot short
Backup alarm/lamp relay 1 circuit: Hot short
Trouble
(Machine monitor system)
Causes
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
Replace backup lamp
relay (L109) with
another relay.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between L109 (male) (1) – (2)
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
(Set FNR (directional) lever or switch to R (Reverse) position.)
Wiring harness between L24 (female) (12) –
L109 (female) (2)
If causes 1 and 2 are not detected, machine monitor may be defec-
tive. (Since trouble is in system, troubleshooting cannot be carried
out.)
340 Troubleshooting by failure code (Display of code), Part 4
Standard value in normal state/Remarks on troubleshooting
Condition becomes
normal.
Condition does not
become normal.
Relay (L109) is
defective.
Relay (L109) is
normal
Resis- 200 – 400
tance z
Voltage Max. 1 V
WA250, 250PZ-6