1. Open Issue: Diagnosis Of Open And Short Circuit Faults With Freeze Frame Data For OBD-I Grade A Proposal By India

2. Background EPPR 15-05 Slide 5, India proposal to delete Need for FFD for Grade A. EPPR 15-13 Japan Proposal slide 7 on FFD requirement for Grade A Discussion during EPPR 15 on this point and need for more data from India.

3. Data generation Based on the request at EPPR 15, India collected data on two vehicles. Both vehicles had Engine Controller (ECU) from different manufacturer Both ECU’s are compliant to OBD I fully Faults were created in both vehicles in different sensors at two different operating points

4. ECU Freeze Frame data ECU Freeze Frame data captured during open and short circuit faults of sensors like Engine temperature sensor, Throttle Position Sensor and Lambda sensor for ECUs from two different manufacturers Freeze frame data also captured at different engine speeds to identify the possible link between Freeze Frame data and the root cause of faults.

5. Manufacturer 1 ECU Freeze Frame Data Engine Temperature Sensor short

6. Manufacturer 1 ECU Freeze Frame Data

7. Engine Temperature Sensor open Manufacturer 1 ECU Freeze Frame Data

8. Engine Temperature Sensor open Manufacturer 1 ECU Freeze Frame Data

9. O2 Sensor open Manufacturer 1 ECU Freeze Frame Data

10. O2 Sensor open Manufacturer 1 ECU Freeze Frame Data

11. O2 Sensor heater short Manufacturer 1 ECU Freeze Frame Data

12. O2 Sensor heater short Manufacturer 1 ECU Freeze Frame Data

13. TPS Open Manufacturer 1 ECU Freeze Frame Data

14. TPS Open Manufacturer 1 ECU Freeze Frame Data

15. TPS Short Manufacturer 1 ECU Freeze Frame Data

16. TPS Short Manufacturer 1 ECU Freeze Frame Data

17. Injector Open Manufacturer 1 ECU Freeze Frame Data

18. Injector Open Manufacturer 1 ECU Freeze Frame Data

19. Injector Short Manufacturer 1 ECU Freeze Frame Data

20. Injector Short Manufacturer 1 ECU Freeze Frame Data

21. Manufacturer 2 ECU Freeze Frame Data Engine Temperature Sensor short

22. Engine Temperature Sensor open Manufacturer 2 ECU Freeze Frame Data

23. Engine Temperature Sensor open Manufacturer 2 ECU Freeze Frame Data

24. TPS Open Manufacturer 2 ECU Freeze Frame Data

25. TPS Open Manufacturer 2 ECU Freeze Frame Data

26. TPS Short Manufacturer 2 ECU Freeze Frame Data

27. Injector Open Manufacturer 2 ECU Freeze Frame Data

28. Injector Short Manufacturer 2 ECU Freeze Frame Data

29. Conclusions Freeze frame data captured during open and short circuit faults of sensors at different engine speeds does not have sufficient information to identify cause for fault Freeze frame data will not help in failure cause analysis for open and short circuit faults Hence freeze frame data need not be mandatory for OBD I Grade A