Computers and Control Systems: Testing and Inspection

Recovering DEFCM After Failed Programming Event

Instruction for Diesel Exhaust Fluid Control Module (DEFCM) Recovery After a Failed Programming Attempt
1. Fully close IDSS.
2. Disconnect the IDSS interface module connector from the vehicle data link connector (DLC) if connected.
3. Turn OFF the ignition and wait 1 minute.
4. Connect IDSS to the vehicle DLC and PC USB port (if not already connected).
5. Turn ON the ignition with the engine OFF.
6. Open IDSS.
7. Choose the correct vehicle information on the IDSS Main screen and then click Submit.
8. Click on Controller Programming -- Diesel Exhaust Fluid Control Module (DEFCM) -- Software and Calibrations -- Replace and Reprogram Controller from the table of contents.

IMPORTANT: The left IDSS bulb on the ICON toolbar MUST be green at this point indicating IDSS is connected to the vehicle AND is talking to the PC USB port. If it is still red, check that the IDSS interface module is being powered up by making sure the IDSS interface module power LED is red. If the IDSS interface module LED is red, then the PC may not be talking with the USB port and a PC reboot may be necessary.

9. At the Original Controller Needed screen, click No.
10. At the VIN screen, enter the correct 17-digit VIN, then click Next.

IMPORTANT: Do NOT turn OFF the ignition at the Install New Controller Screen even if IDSS states so.

11. Do NOT turn OFF the ignition at the Install New Controller screen. Click NO when asked is the Original Controller installed.
12. At the Summary of Calibrations screen, click Reprogram Controller. Programming should begin.

NOTE: The controller is accepting the download IF the programming dialogue Sending Bytes is incrementing. The Sending Bytes incremental counter normally begins counting at around 30-35 seconds.

13. After the programming event has finished, turn OFF the ignition for 3 minutes as instructed by IDSS.
14. Turn ON the ignition with the engine OFF, then clear DTCs.
15. Programming is complete.