Error Code [308] (Abnormality In Fuel Control Dial) - Komatsu PC130-7 Shop Manual

TROUBLESHOOTING

Error code [308] (Abnormality in fuel control dial)

User code Error code
E05 308
Contents of
• The signal voltage from the fuel control dial is below 0.23 V or above 4.77 V.
trouble
• Calculates the fuel control dial position from the voltage just before occurrence of the trouble and uses
Action of
it for control.
controller
• If the cause of the failure disappears, the system resets itself.
• If the output was set in the full mode before occurrence of the failure, it is not set in the partial mode.
Problem that
• If the output was set in the partial mode before occurrence of the failure, it is not set in the full mode.
appears on
• The engine hunts.
machine
• The high idling speed is not obtained and the output is insufficient.
Related • The input state (voltage) from the fuel control dial can be checked with the monitoring function.
information (Code: 030, by 10 mV)
Defective sensor power
1
supply system
Defective fuel control dial
2
(Internal defect)
Disconnection in wiring
harness (Disconnection in
3
wiring harness or defective
contact in connector)
Possible causes
and standard
value in normal
state
Short circuit with chassis
ground in wiring harness
4
(Contact with ground cir-
cuit)
Short circuit with power
5 source in wiring harness
(Contact with 24-V circuit)
Defective governor and
6
pump controller
20-356
(1)
Abnormality in fuel control dial
Trouble
(Governor and pump controller system)
Cause Standard value in normal state/Remarks on troubleshooting
If error code [226] is displayed, carry out troubleshooting for it first.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
aPrepare with starting switch OFF, then carry out troubleshooting with-
out turning starting switch.
Wiring harness between C01 (female) (22) and
J07 and E06 (female) (1)
Wiring harness between C01 (female) (21) and
E06 (female) (3)
Wiring harness between C01 (female) (19) and
E06 (female) (2)
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between C01 (female) (19) – E06 (female) (2)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between C01 (female) (22) – J07 – E06
(female) (1) wiring harness and chassis ground
Between C01 (female) (19) – E06 (female) (2)
wiring harness and chassis ground
aPrepare with starting switch OFF, then turn starting switch ON and car-
ry out troubleshooting.
Between (22) and (21)
Between (19) and (21)
E06 (male)
Between (A) and (C)
Between (B) and (A)
Between (B) and (C)
C01
Power supply
Signal
[308]
Resistance
4.0 – 6.0 z
0.25 – 5.0 z
0.25 – 5.0 z
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Min. 1 Mz
Resistance
Voltage Max. 1 V
Voltage Max. 1 V
Voltage
4.5 – 5.5 V
0.5 – 4.5 V
PC130-7