note You do not need to perform the calibration for the battery current sensor mounted on the 4J1 engine. Do not use the items of the battery current sensor calibration displayed on the MUT-III.


The engine-ECU carries out the electrical generation control according to the charge level of the battery, based on the battery current sensor signal. To improve the effect of reducing the fuel consumption by the electrical generation control, it is necessary to accurately detect the charge level of the battery. For this, if the following services are performed, carry out the battery current sensor calibration.

  • Replacing the battery current sensor
  • Replacing the engine-ECU


1.After the ignition switch is in "LOCK" (OFF) position, disconnect the battery cable from the negative battery terminal.

2.Remove the battery current sensor from the battery cable (do not disconnect the battery current sensor connector).
3.Connect the battery cable without the battery current sensor to the negative battery terminal.

4.Connect the M.U.T.-III to the diagnosis connector (but do not start the engine).
5.Turn the ignition switch to the ON position.
6.Select "MPI/GDI/DIESEL" from System select Screen of the M.U.T.-III.
7.Select "Special Function" from MPI/GDI/DIESEL Screen.
8.Select "Learning" from Special Function Screen.
9.Select "Battery current SNSR.calibration" from Learning Screen.
10.Start the calibration by pressing the "OK" button.
11.Confirm that the M.U.T.-III data list item No. 452 Battery current sensor calibration is "Completed".
12.After the ignition switch is in "LOCK" (OFF) position, disconnect the M.U.T.-III.
13.Install the battery current sensor.