PROCEDURES FOR WRITING BMU LEARNING VALUE <PHEV>


If the BMU is replaced, follow the procedure below to save the values stored in the old BMU and then write them to the new BMU.

1.Turn off the power supply mode of the electric motor switch. Then connect the M.U.T.-III to the diagnosis connector.
2.Turn on the power supply mode of the electric motor switch without depressing the brake pedal.
3.From the System select Screen of the M.U.T.-III, select the "BMU".
4.Select the "Special Function" from the BMU Screen.
5.Select the "Write learned value (change ECU)" from the Special Function Screen.
6.Select the "Learning value Read & save" from the Write learned value (change ECU) Screen.
7.Save the data from the Learning value Read & save Screen. If the BMU learning value cannot be saved, write the BMU learning value manual.
note When the learned value file is normally saved, the "Learned value Save Complete" is displayed on the M.U.T.-III Screen.
8.Turn off the power supply mode of the electric motor switch, and then replace the BMU.
9.Turn on the power supply mode of the electric motor switch without depressing the brake pedal.
10.Select the "Saved learned value writing" from the Write learned value (change ECU) Screen.
11.Select the saved data from the Saved learned value writing Screen to write the BMU learning value.
note Use only the BMU learning value file saved in the Step 7. Do not use other files.
note When the BMU learning value is correctly written, the "Completed" should be displayed on the M.U.T.-III Screen.
12.Turn off the power supply mode of the electric motor switch, and then disconnect the M.U.T.-III.

BMU LEARNING VALUE MANUAL WRITTEN



1.Check a manufactured date on the label attached on the drive battery from the underbody left side.
2.Calculate how many days elapsed by subtracting the next month of the month-of-manufacture from the current month (number of months).

3.Turn off the power supply mode of the electric motor switch. Then connect the M.U.T.-III to the diagnosis connector.
4.Turn on the power supply mode of the electric motor switch without depressing the brake pedal, and wait for ten seconds. Then check that no diagnosis code is stored. If any diagnosis code is stored, diagnose the system.
5.Check a distance travelled (km) on the odometer, and make a note of it.
note If the drive battery has been replaced before, subtract the distance (when the drive battery was replaced) from that current distance.
6.From the System select Screen of the M.U.T.-III, select the "BMU".
7.Select the "Special Function" from the BMU Screen.
8.Select the "Write learned value (change ECU)" from the Special Function Screen.
9.Select the "Manual writing" from the Write learned value (change ECU) Screen.
10.Enter the number of the months calculated at step 2 into "Sum total time back up" (number of months) on the leaned value manual writing screen.
11.Enter the distance recorded at step 5 into "travel distance" on the leaned value manual writing screen. Then write the learned values to the new BMU.
note Ignore the items other than "Sum total time back up" and "travel distance" on the screen.
note When the learned value is written correctly, the "Writing is done." is displayed on the M.U.T.-III screen.
12.Turn off the power supply mode of the electric motor switch.
13.Measure the main battery capacity. (Refer to GROUP 54D - Battery Management Unit (BMU) and Main Battery - On-vehicle Service - Main Battery Capacity Measurement ).