E-18 The Komtrax System Does Not Work Properly - Komatsu WA250-6 Shop Manual

400 Troubleshooting of electrical system (E-mode)

E-18 The KOMTRAX system does not work properly

E-18 The KOMTRAX system does not work properly
Trouble
• The KOMTRAX system does not work properly.
• If the KOMTRAX system administrator asks you to check whether any defect occurs in the machine
Related
system, carry out the following troubleshooting.
information
• A defect in the KOMTRAX system, if any, does not appear especially as a defective phenomenon.
1 Defective power supply
2 Defective communication
Defective starting switch
3 ACC signal and alternator R
signal
Possible
causes and
standard value
in normal state
Defective starting switch C
4
signal
Defective CAN connection
5
state
WA250, 250PZ-6
Cause
a Turn the starting switch OFF, then carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (39), (40) –
a Turn the starting switch ON, then carry out troubleshooting.
a Turn the starting switch ON, then start engine and carry out trou-
bleshooting.
a Prepare with starting switch OFF, then start engine and carry out
troubleshooting.
Between (36) and
Between (28) – (37),
a Turn the starting switch ON, then carry out troubleshooting.
a Prepare with starting switch OFF, then turn starting switch ON
and carry out troubleshooting.
Between (10) and (9)
Between (27) and
a Turn the starting switch ON, and carry out troubleshooting.
a Prepare with starting switch OFF, then carry out troubleshooting
without turning starting switch ON.
Between (7) and (8)
Standard value in normal state/Remarks on troubleshooting
LED (1)
LED-A1
L80
Constant power sup-
(37) and (38)
LED (2)
LED-A2
LED (6)
LED-C1
L80
Starting switch ACC
(37), (38)
Alternator R
(38)
LED (8)
LED-C3
L80
Starting switch C
(37), (38)
LED (9)
LED-C4
L80 (female)
SEN03848-00
Normal state
ON
Signal Voltage
20 – 30 V
ply
Normal state
ON
Normal state
ON
Signal Voltage
20 – 30 V
20 – 30 V
Normal state
During cranking: Blinking
Other than above: OFF
Signal Voltage
S-NET 6 – 9 V
During cranking:
20 – 30 V
Other than above:
Max. 1 V
Normal state
ON
Signal Resistance
CAN 40 – 80 z
40-400
1
73