Komatsu PC200-8M0, Shop Manual

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SEN06138-00
PC200, 200LC, 220, 220LC-8M0 40-400
35
400 Troubleshooting of electrical system (E-mode)
E-16 Travel speed does not change
E-16 Travel speed does not change
Circuit diagram related to travel speed solenoid
Failure
1) When travel speed selector switch is operated, display of travel speed monitor does not
change.
Related information
q Signal of travel speed selector switch can be checked with monitoring function.
(Code: 04504 Monitor 1st, 2nd line switches)
Cause Procedure, measuring location, criteria and remarks
1 Defective machine monitor
Machine monitor may be defective. (Since this is an internal defect, trouble-
shooting cannot be performed.)
Failure 2) When selection of travel speed is changed, actual travel speed does not change.
Related information
q When failure due to cause 1 occurs, actual travel speed does not decrease when travel speed
setting is changed to "Lo".
q As T-adapter for pump controller connector is "socket-type box", operating voltage cannot be
measured at pump controller connector.
Cause Procedure, measuring location, criteria and remarks
1
Hot short circuit in wiring harness
(contact with 24 V circuit)
1. Turn starting switch to OFF position.
2. Disconnect connector V04 and connect T-adapters to female side.
3. Turn starting switch to ON position.
Between V04 (female) (2) and ground Voltage Max. 3 V
2 Defective machine monitor
If no problem is found in check on cause 1, machine monitor may be defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
3 Defective pump controller
If no problem is found in checks on causes 1 and 2, pump controller may be
defective (Since this is an internal defect, troubleshooting cannot be per-
formed.)