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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.
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2.Put the vehicle in the following idling stable conditions:
- Engine coolant temperature: 80 - 90°C
- Automatic transmission fluid temperature: 60°C or higher
- Lamps, A/C condenser fan and all accessories: OFF
- Transmission: Neutral
- Power steering: Static state
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3.Select SPECIAL FUNCTION from the function menu.
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4.Select SMALL INJECTION QUANTITY LEARNING from the SPECIAL FUNCTION menu to execute
learning.
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5.Continue idling for about 3 minutes before learning is completed.
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6.Confirm that the engine warning lamp is off. If it still blinks, reexecute learning.
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