Komatsu PC130-7, Shop Manual

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