Kubota V3800-CR-TE4 Diagnosis Manual page 165

V3800-CR-TE4,V3800-CR-TIE4, DM
6. Check the SCV-related Data
1. Check the "Target rail pressure", "Actual rail pressure", "Target
SCV current", "Actual SCV current", "Pump deviation learning
status", "Pump deviation learning correction value" and
"Pressure feedback integral guard execution flag" on the data
monitor.
2. Observe the data signals by operating the accelerator pedal and
others and by performing the actual run test.
1. The "Actual SCV current value" always follow to the
"Target SCV current value".
• When idling: Approx. 1800 mA
• Accelerator opening: 0 → 100 % (During
acceleration): Approx. 1400 mA minimum
• During no-load maximum speed: Approx. 1600 mA
• The numerical value is stable under normal operating
and the target value corresponds with actual
pressure value.
* The current shall be used as a reference only as
this value varies depending on the pump used.
2. The "Pressure feedback integral guard executing flag"
Factory
must be OFF.
specification
3. The "Pump deviation learning correction value" must be
within ±200 mA.
NOTE
• As the following value of A varies depending on
pump, the table above is for guideline. If the value of
A has a wider shift than the initial learning value,
there may be out of the range of the above table.
A net normal value is the value that provided by the
forced-learning several times.: Compared with A
12 V spec.: A − 100 ≤ normal value ≤ A + 50
Therefore, if the value is out of the range above,
perform the forced-learning.
NOTE
• "Pump difference learning status"
It must be "2" (Learning completed) or "3" (During
relearning). If not, keep idling the engine after warming up
and when the learning status becomes "2" or "3", make the
judgment. Occasionally, it does not shift from 3 to 2.
Perform pump difference learning to take into account the
above status, then compare with the status before learning.
OK After confirming that an intermittent malfunction (such as power supply
system or noise generation) does not occur in relation to the ECU,
replace the ECU.
NG Replace the supply pump.
(a) CAN1 Connector
1-S138
COMMON RAIL SYSTEM
[A] M60 Series
[B] M-GX Series
9Y1200192CRS0922US0
KiSC issued 05, 2012 A