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The engine-ECU learns the relation between the suction control valve (linear solenoid valve) of the supply pump drive current and the fuel injection volume.
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The learning value is calculated from the suction control valve drive current and the rail pressure sensor output voltage.
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When the supply pump is replaced, therefore, this learning must be executed.
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Re-learning is executed when the engine is idling after the learning value in the engine-ECU has been reset by the M.U.T.-III.
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1.After the ignition switch is in the "LOCK" (OFF) position <except vehicles with KOS> (or put the power supply mode is OFF <vehicles with KOS>), connect the M.U.T.-III to the diagnosis connector.
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2.Turn the ignition switch to the "ON" position <except vehicles with KOS> (or put the power supply mode is ON <vehicles with KOS>). (Do not start the engine.)
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3.Select SPECIAL FUNCTION from the function menu.
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4.Select INITIALIZATION from SPECIAL FUNCTION menu.
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5.Select and initialise Item No. 21 Supply pump exchange service.
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6.After initialising, run the engine at idle in the following conditions.
- Accelerator pedal: OFF
- Engine coolant temperature: 60°C or higher
- Fuel temperature: 30°C or higher
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7.Confirm that the item No. 65 High pressure pump learned status on M.U.T.-III Service Data is "2".
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