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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 suction control valve or 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 "LOCK" (OFF) position, connect the M.U.T.-III to the
diagnosis connector.
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2.Turn the ignition switch to "ON" position. (Do not start the engine.)
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3.Select SPECIAL FUNCTION from the function menu.
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4.Select INITIALISATION from SPECIAL FUNCTION.
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5.Select and initialize Item No. 21 Supply pump exchange service.
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6.After initializing, 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 Data
List is "2".
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