Fuel Gauge Display Does Not Move From Minimum Or Maximum - Komatsu PC88MR-10 Shop Manual

E-12 Fuel gauge display does not move from minimum or
maximum
(PC88MR-FGE-400-A-Z0-A)
1) While fuel is added, fuel gauge indicator does not rise from red range (E).
Failure
2) While fuel level is low, fuel gauge indicator does not lower from green range top (F)
Signal voltage of fuel sensor can be checked with monitoring function.
Related
(Code: 04200)
information
No. Cause
Defective fuel level
sensor
1
(internal open or short
circuit)
Open and short circuit
2
in wiring harness
Open circuit in wiring
harness
3
(wire breakage or
defective contact of
connector)
Ground fault in wiring
harness
4
(Contact with ground
circuit)
Hot short circuit in
5
wiring harness
Defective machine
6
monitor
Circuit diagram related to fuel level sensor
PC88MR-10
Procedure, measuring location, criteria, and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector P21 and connect T-adapter to male side.
Between P21 (male) (1)
Resistance
and ground
1. Turn starting switch to OFF position.
2. Disconnect connector CM01, and connect T-adapter to female side.
Between CM01 (female)
Resistance
(15) and ground
a If no failure is found by check on Cause 2, this check is not required.
1. Turn starting switch to OFF position.
2. Disconnect connectors CM01 and P21 and connect T-adapters to each
female side.
Resistance Between CM01 (female) (15) and P21 (female) (1)
1. Turn starting switch to OFF position.
2. Disconnect connectors CM01 and P21, and connect T-adapter to either
female side.
Between ground and CM01 (female) (15) or P21
Resistance
(female) (1)
1. Turn starting switch to OFF position.
2. Disconnect connector P21.
3. Insert T-adapter into connector CM01 or connect T-adapter to female side
of connector P21.
4. Turn starting switch to ON position.
Between ground and CM01 (15) or P21 (female) (1) Approx. 3.3
Voltage
If no failure is found by preceding checks, machine monitor is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
40 Troubleshooting
Troubleshooting of electrical system (E-mode)
Fuel level: FULL
Fuel level: EMPTY
Fuel level: FULL
Fuel level: EMPTY
Approx. 10
z
85 to 95 z
Approx. 10
z
85 to 95 z
Max. 1 z
Min. 1 Mz
V
40-399