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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.
2.Turn the ignition switch to the "ON" position. (Do not start the engine.)
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 "Initialisation" from Special Function Screen.
6.Select Item No. 21 "Supply pump exchange service" from "Initialisation Screen and
execute the initialisation of learning value.
- Accelerator pedal: OFF (not depressed)
- Engine coolant temperature: 60°C or higher
- Fuel temperature: 30°C or higher
7.After initialising, run the engine at idle in the following conditions for 30 seconds.
8.Confirm that the Item No. 65 "High press. pump learned status" on M.U.T.-III Data
List is "2".
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"2" indicates that the learning has completed.
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)