Fuel Level Gauge Does Not Indicate Normally - Komatsu Galeo PC138US-8 Shop Manual

40 Troubleshooting
E-11 Fuel level gauge does not indicate normally
(1) While fuel is added, fuel level gauge does not rise from red range (E).
Trouble
(2) While fuel level is low, fuel level gauge does not lower from green range top (F)
Related • Signal voltage of fuel level sensor can be checked with monitoring function.
information (Code: 04200 Fuel level sensor voltage)
Defective fuel level sensor
1 (Internal disconnection or
short circuit)
Disconnection in wiring har-
ness (Disconnection in wiring
2
or defective contact in con-
nector)
Possible causes
and standard
Ground fault in wiring har-
value in normal
3 ness (Short circuit with GND
state
circuit)
Hot short (Short circuit with
4
24V circuit) in wiring harness
5 Defective machine monitor
Circuit diagram related
PC138US, USLC-8
Cause Standard value in normal state/Remarks on troubleshooting
a Prepare with starting switch OFF, then carry out troubleshoot-
chassis ground
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between CM01 (female) (9)
– P21 (female) (1)
a Prepare with starting switch OFF, then carry out troubleshoot-
Wiring harness between CM01 (female) (9)
– P21 (female) (1)
a Prepare with starting switch OFF, then turn starting switch ON
Wiring harness between CM01 (female) (9)
– P21 (female) (1)
a Prepare with starting switch OFF, then carry out troubleshoot-
CM01 (female)
chassis ground
ing without turning starting switch ON.
P21 (male) Fuel level
Between (1) –
ing without turning starting switch ON.
ing without turning starting switch ON.
and carry out troubleshooting.
ing without turning starting switch ON.
Fuel level
Between (9) –
SEN02467-00
Resistance
7 – 11 z
FULL
85 – 95 z
EMPTY
Resis-
tance
Resis-
tance
Voltage
Resistance
7 – 11 z
FULL
85 – 95 z
EMPTY
1
Max. 1 z
Min. 1 Mz
Max. 1 V
25