Repair Procedure B

Reprogramming the Engine ECU





1. Confirm that the auxiliary battery is fully charged using the Midtronics Battery Tester before proceeding. The Prius Automatic Charger MUST be connected during reprogramming.

CAUTION:
Do not use a jumper battery in place of the Midtronics Battery Tester or IRREPARABLE DAMAGE TO THE ENGINE ECU MAY RESULT.

2. Select "3. UPDATE ECU CAL" from the ECU REPROGRAM MAIN MENU."





3. Select 1: IN-SERVICE ECU" from UPDATE ECU CAL SELECT ECU TYPE" menu.





4. Confirm the following before proceeding:

^ IG is "OFF." Push the "POWER" switch once without depressing brake pedal until the indicator lamp turns off.

^ Engine hood is opened.

^ All electrical accessories are OFF (i.e., audio systems, dome lamp, navigation system, air conditioner, etc.).

^ The parking brake is applied.

5. Press the "YES" key.





6. Confirm that the Diagnostic Tester displays the appropriate vehicle type. If it is not the correct vehicle, please refer to TSB No. SS002-01 ECU Flash Reprogramming Process" to update the Diagnostic Tester.

7. Press the "ENTER" key.





8. Confirm that the Diagnostic Tester displays "34705000" or later.

NOTE:
If the Diagnostic Tester displays "YES" instead of "NO," the Engine ECU has been reprogrammed already. Press the "EXIT" key and turn off the Diagnostic Tester. Proceed to Recalibration Label Installation.

9. Press the "ENTER" key.





10. Select the current matching calibration ID that is currently on the vehicle.

11. Press the "ENTER" key.





NOTE:
If you select the wrong calibration ID, the Diagnostic Tester will display the screen shown to the right. Please select the correct calibration ID again after pressing the "ENTER" key.





12. Push the "POWER" switch twice without depressing the brake pedal and confirm that the hybrid system is "IG-ON."

NOTE:

^ Do not start the hybrid system if the "READY" light is on. You will need to turn the vehicle OFF and repeat step 12.

^ Confirm that the power switch indicator is amber in color.





13. Press the YES" key.

NOTE:
Do not do anything that will increase an electrical load to the vehicle after pressing the "YES" key.





CAUTION:

^ The progress bar will display after approximately one minute.

^ It will take approximately 24 minutes to complete the reprogramming.

^ During the reprogramming, do not touch the Diagnostic Tester and the cable in order to avoid reprogramming failures.

^ After reprogramming, warning lights may be displayed on the dash and multi-display. DTCs may be set in the memory of various ECUs. This is normal and the codes must be cleared prior to release of the vehicle.





14. After approximately 24 minutes, the Diagnostic Tester will display the screen shown at right.

15. Push the "POWER" switch until the indicator lamp turns off without depressing the brake pedal.

16. Press the "ENTER" key.





17. Confirm that the Diagnostic Tester displays both "34705000" (or a newer calibration) and "YES."

18. Press the "EXIT" key.





19. Push the "POWER" switch twice without the brake pedal depressed and confirm that the hybrid system is "IG-ON."

NOTE:

^ Do not start the hybrid system in "READY" mode.

^ Power switch indicator must be amber in color.





20. Press the "YES" key.





21. The Diagnostic Tester is currently confirming that the CAN Interface Module has been updated.





22. Select "2. CURRENT ECU CAL" from the ECU REPROGRAM MAIN MENU."





23. Confirm that the Diagnostic Tester displays the correct calibration ID:
34705000 (or a newer calibration).

24. Press the "ENTER" key.

25. Turn off the Diagnostic Tester.

26. Push the "POWER" switch once without depressing the brake pedal to turn ignition off.

27. Clear any DTC codes that have been set.