13E
13E-43
7. Initialization of Supply Pump Unit Difference Learning Value in Engine Electron-
ic Control Unit
• Following replacement of the engine electronic control unit or the supply pump, this item is used to program the
current supply pump data into the engine electronic control unit.
7.1 After replacement of engine electronic unit with new one
7.2 After re-installing of other truck’s engine electronic control unit or replacement of supply
pump without replacing engine electronic control unit. (This operation is available with Multi-
Use tester-III.)
7.3 Check after engine electronic control unit programming
If the measurement values (which show the learning values) shown by service data 52: Pump Adjustment Value
(Last Time) and 53: Pump Adjustment Value (This Time) are out of specification, a defect in the supply pump or in
the engine electronic control unit is conceivable so you must replace the supply pump or engine electronic control
unit. (Initialize the engine electronic control unit again after replacing the supply pump or engine electronic control
unit.)
• New engine electronic control unit starts automatic pump adjustment after engine warming-up and various condi-
tions satisfied. To replace the supply pump and engine electronic control unit, complete all the replacement jobs
other than the replacement of engine electronic control unit. Then replace the new unit.
Replacement of engine electronic control unit with new one
Start engine. Allow it to warm up fully then run at low idle speed for 30 seconds. *
Check service data 4D: Pump Adjustment State.
Learning, Temporal leaning completed or Learning completed will be shown.
End of programming
* New engine electronic control unit starts auto learn-
ing when the truck is in a halt condition, engine low-
idling, fuel temperature between 20 and 80˚C (68 and
176˚F) and water temperature 65˚C (149˚F) or higher
without any defect.
Replacement of supply pump or replacement (re-use) of engine electronic control unit
Perform actuator test C2: Pump Adjustment Value Clear
Start engine. Allow it to warm up fully then run at low idle speed for 30 seconds.
Check service data 4D: Pump Adjustment State.
Learning, Temporal leaning completed or Learning completed will be shown.
End of programming
Erase the compensation information (pump learning condition) in the electronic control unit.
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