Komatsu PC200-8M0, Shop Manual

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301 Troubleshooting by failure code, Part 1
Failure code [B@BCZK] Radiator Coolant Level Low
40-301
16
PC200, 200LC, 220, 220LC-8M0
SEN06133-00
Failure code [B@BCZK] Radiator Coolant Level Low
Action
level
Failure code
Failure
Radiator Coolant Level Low
(Machine monitor system)
L01 B@BCZK
Detail of failure
q
While starting switch is at ON position (with engine stopped) or engine is running, radiator coolant
level switch signal voltage does not remain below 1 V, so machine monitor determines that radiator
coolant level is low (sensor contact is open).
Action of con-
troller
q
Displays radiator coolant level monitor yellow on machine monitor.
Problem on
machine
q
If machine is operated as it is, engine may overheat.
Related infor-
mation
q
Input (ON/OFF) from radiator coolant level switch can be checked with monitoring function.
(Code: 04500 Monitor input 1)
q
Method of reproducing failure code: Turn starting switch to ON position.
Cause Procedure, measuring location, criteria and remarks
1
Lowered radiator coolant level
(when system works properly) Check radiator sub tank for lowering of coolant level. If coolant level is low, add
coolant.
2
Defective coolant level switch
(internal defect)
1. Turn starting switch to OFF position.
2. Disconnect connector P24 and connect T-adapters to male side.
Between P24 (male) (1) and (2)
Between
FULL and
LOW lines
Resistance Max. 1
z
Below LOW
line
Resistance Min. 1 M
z
3
Open circuit in wiring harness
(Wire breakage or defective con-
tact)
1. Turn starting switch to OFF position.
2. Disconnect connectors CM02 and P24, and connect T-adapters to each
female side.
a
Add coolant.
Between CM02 (female) (3) and P24 (female) (1) Resistance Max. 1
z
4 Defective machine monitor
If no failure is found by above checks, machine monitor is defective.
q
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapters into connector CM02.
3. Turn starting switch to ON position.
Between CM02 (3) and CM01 (3)
Between
FULL and
LOW lines
Voltage Max. 1 V
Below LOW
line
Voltage 7 – 11 V