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Analysis of Freeze Frame Data for Open and Short Fault Diagnosis in OBD I Grade A Systems

Data collected from two vehicles with different manufacturer ECUs shows that Freeze Frame data captured during open and short circuit faults of sensors at different engine speeds does not provide sufficient information to identify the cause of the faults. The study concludes that Freeze Frame data will not aid in failure cause analysis for open and short circuit faults, suggesting that it may not be necessary for OBD I Grade A systems.

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Analysis of Freeze Frame Data for Open and Short Fault Diagnosis in OBD I Grade A Systems

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  1. Diagnosis of open and short faults with Freeze frame data for OBD I Grade A

  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 Engine Temperature Sensor short

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

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

  9. Manufacturer 1 ECU Freeze Frame Data O2 Sensor open

  10. Manufacturer 1 ECU Freeze Frame Data O2 Sensor open

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

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

  13. Manufacturer 1 ECU Freeze Frame Data TPS Open

  14. Manufacturer 1 ECU Freeze Frame Data TPS Open

  15. Manufacturer 1 ECU Freeze Frame Data TPS Short

  16. Manufacturer 1 ECU Freeze Frame Data TPS Short

  17. Manufacturer 1 ECU Freeze Frame Data Injector Open

  18. Manufacturer 1 ECU Freeze Frame Data Injector Open

  19. Manufacturer 1 ECU Freeze Frame Data Injector Short

  20. Manufacturer 1 ECU Freeze Frame Data Injector Short

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

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

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

  24. Manufacturer 2 ECU Freeze Frame Data TPS Open

  25. Manufacturer 2 ECU Freeze Frame Data TPS Open

  26. Manufacturer 2 ECU Freeze Frame Data TPS Short

  27. Manufacturer 2 ECU Freeze Frame Data Injector Open

  28. Manufacturer 2 ECU Freeze Frame Data Injector Short

  29. ECU Freeze Frame Data 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

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