BarrSlides_FINAL_SCRUBBED.pdf?utm_content=bufferb9206&utm_medium=social&utm_source=twitter

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TOYOTA’S DEFECTIVE THROTTLE CONTROLDeath not DetectedMemory CorruptiondeadTask Xunmirroredcommand(e.g. 50%)readMotorControlTask“Fail-Safes” Monitoring This Portion Only(no knowledge of driver’s actual intent)38Barr Chapter RegardingToyota’s Software Bugs
LAYER 2: DTCs AND FAIL-SAFE MODESNASA talks about 5 fail-safe modes (pp. 79-83)! Limp home modes 1-3 (degrees of gas pedal sensor mistrust)! Idle mode fuel cut (2,500 rpm limit at idle)! Engine off (via several different “class 2” failures)However, all 5 fail-safes are in same Task X! Throttle control and fail-safes in same fault containment regionUnreasonable design; alternative structures well-knownMost diagnostic trouble codes need Task X too!39Barr Chapter RegardingToyota’s Fail Safe Modes
Page 3 and 4: BOOKS BY MICHAEL BARR1ed: 1999; 2ed
Page 5 and 6: MY REVIEW OF TOYOTA’S SOURCE CODE
Page 7 and 8: ELECTRONIC THROTTLE CONTROLfdadg7
Page 9 and 10: SAFETY-CRITICAL SYSTEMSNot all embe
Page 11 and 12: SUMMARY OF 2005 CAMRY L4 CONCLUSION
Page 13 and 14: NASA DID NOT RULE OUT UA BY SOFTWAR
Page 15 and 16: 15ETCS SOFTWARE MALFUNCTION
Page 17 and 18: TOYOTA’S OPERATING SYSTEM (OSEK)1
Page 19 and 20: MEMORY CORRUPTION AND TASK DEATH0Bi
Page 21 and 22: SOFTWARE CAUSES OF MEMORY CORRUPTIO
Page 23 and 24: TOYOTA’S SPAGHETTI CODETOY-MDL049
Page 25 and 26: STACK ANALYSIS FOR 2005 CAMRY L4OSE
Page 27 and 28: TOYOTA’S MAJOR STACK MISTAKESToyo
Page 29 and 30: TOYOTA FAILED TO COMPLY WITH STANDA
Page 31 and 32: TOYOTA FAILED TO COMPLY WITH STANDA
Page 33 and 34: NASA’S SOFTWARE AREAS OF CONCERNN
Page 35 and 36: LAYER 1: MIRRORING OF CRITICAL VARI
Page 37: UA VIA MEMORY CORRUPTIONTask X deat
Page 41 and 42: TOYOTA’S DEFECTIVE WATCHDOG DESIG
Page 43 and 44: TOYOTA FAILED TO REVIEW MONITOR CPU
Page 45 and 46: MONITOR CPU IS LAST LINE OF UA DEFE
Page 47 and 48: TOYOTA’S INADEQUATE SOFTWARE PROC
Page 49 and 50: NASA SOUGHT WHAT BARR GROUP FOUND
Page 51 and 52: INDIVIDUAL TASK DEATH OUTCOMES(Watc
Page 53 and 54: UA FOREVER IF BRAKE ON AT TASK DEAT
Page 55 and 56: OTHER SIMILAR INCIDENT CRITERIAVehi
Page 57: TOYOTA’S EXPERT HAS NOT REBUTTEDM

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