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To keep emission and noise level at adequate levels, the engine-ECU must learn injector
fuel injection in idle mode.
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During learning, the engine-ECU calculates actual injection from each cylinder based on
changes in engine speeds and corrects pilot injection control. It then keeps records of this amount
of correction as a learned value.
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For this reason, after the engine-ECU or injector is replaced, learning must be executed
using the M.U.T.-III.
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1.After the ignition switch is in "LOCK" (OFF) position, connect the M.U.T.-III to the diagnosis
connector. 2.Put the vehicle in the following idling stable conditions:
- Engine coolant temperature: 76 - 100°C
- Fuel temperature: 30 - 100°C
- Intake air temperature: -30 to 100°C
- Barometric pressure: 70 kPa or more
- Lamps, radiator fan and all accessories: OFF
- Transmission: Neutral
- Power steering: Static state
3.Select "MPI/GDI/DIESEL" from System select Screen of the M.U.T.-III. 4.Select "Special Function" from MPI/GDI/DIESEL Screen. 5.Select "Learning" from Special Function Screen. 6.Select Item No. 1 "Small Injection qt. Learning" from the Learning Screen to execute
learning.
caution |
If the vehicle conditions
go out of the learning conditions during idling, learning is interrupted. To reexecute learning, the ignition switch must once be turned off.
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7.Continue idling for about 3 minutes before learning is completed. 8.Confirm that the engine warning lamp is off. If it still blinks, reexecute learning.
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