Faults, Errors & Failures
16 chapters Master ISO 26262-5 failure taxonomy, random hardware fault classification, latent fault analysis, multi-point fault concepts, common-cause failures, and the FMEDA methodology for hardware metrics calculation.
How You Learn
Video and text stay in sync. As you scroll through the chapter, the video jumps to the matching explanation automatically.
Learning Objectives
Apply ISO 26262 Failure Taxonomy
Use precise ISO 26262 definitions for faults, errors, and failures, correctly classifying hardware failure modes in FMEDA analysis.
Classify All Hardware Fault Types
Correctly classify single-point, residual, latent, dual-point, and multi-point faults for every failure mode in a hardware element FMEDA.
Analyze Common-Cause Failures
Identify CCF vulnerability in redundant architectures and quantify CCF contributions using beta-factor analysis with appropriate prevention measure credits.
Build Complete FMEDAs
Construct rigorous FMEDA worksheets from element identification through failure rate sourcing, DC assessment, and safety classification.
Chapters
Overview & Motivation
Understand why precise failure taxonomy is foundational to ISO 26262 hardware safety. Learn how fault, error, and failure definitions underpin FMEDA, hardware metrics, and safety mechanism design.
Definitions & Taxonomy
Master ISO 26262 precise definitions of fault, error, failure, violation, and their subcategories. Understand the ISO 26262-1 vocabulary and how it differs from common engineering usage.
Random Hardware Faults
Understand random hardware faults arising from physical degradation mechanisms in semiconductors and electronic components. Covers failure mechanisms, failure rate models, and the FIT rate concept.
Systematic Faults
Distinguish systematic faults from random faults. Understand how design errors, process errors, and usage errors become systematic faults, and how ISO 26262 processes address systematic fault avoidance and control.
Latent Faults
Master the concept of latent faults in ISO 26262 hardware analysis. Understand latent fault definition, the ASIL-dependent latent fault tolerance requirements, and how diagnostic coverage affects latent fault residuals.
Multi-Point Faults
Analyze dual-point and multi-point fault scenarios that bypass single-point fault coverage. Understand fault independence requirements, multi-point fault avoidance, and how MPF metrics relate to PMHF calculation.
Common-Cause Failures
Identify and mitigate Common-Cause Failures (CCF) including dependent failures that can defeat redundant safety architectures. Covers CCF analysis methods, beta-factor models, and prevention measures.
Transient vs. Permanent
Distinguish transient faults (soft errors, EMC-induced) from permanent faults in hardware reliability analysis. Understand how this distinction affects failure rate data, diagnostic coverage, and safety mechanism design.
FTTI Calculator
Calculate Fault Tolerant Time Intervals for hardware fault scenarios using timing models derived from ISO 26262-4. Understand how FTTI constrains diagnostic timing budgets and safety mechanism latency requirements.
Beta-Factor Analysis
Apply beta-factor analysis for quantifying common-cause failure contributions in redundant hardware architectures. Covers the IEC 61508 beta-factor checklist approach adapted for ISO 26262 automotive context.
Failure Rate Data
Source, evaluate, and apply failure rate data from industry databases (IEC 62380, SN 29500, MIL-HDBK-217) for FMEDA. Understand operating conditions, application factors, and how to justify failure rate assumptions.
Bathtub Curve
Understand the bathtub curve failure rate model and its phases: infant mortality, useful life (constant failure rate), and wear-out. Learn how automotive production screening and lifetime design address each phase.
FMEDA Builder
Build a complete Failure Mode Effects and Diagnostic Analysis (FMEDA) from scratch. Cover element identification, failure mode enumeration, failure rate allocation, diagnostic coverage assessment, and safety classification.
Handling Mechanisms
Map hardware fault types to appropriate handling mechanisms: detection, indication, prevention, and tolerance. Understand mechanism selection criteria for each fault class and ASIL level.
HW Metrics Mapping
Connect FMEDA fault classifications to SPFM, LFM, and PMHF hardware metrics calculations. Understand exactly how each fault category contributes to or exempts from metric denominators and numerators.
Case Studies
Apply the complete fault and failure analysis framework to real hardware examples including a microcontroller-based ABS controller, a redundant position sensor system, and an Ethernet switch for ADAS.
Interactive Tools
Fault Taxonomy Tree
Interactive hierarchical diagram of the complete ISO 26262 fault and failure taxonomy with clickable nodes showing definitions, examples, and connections to hardware metrics.
Bathtub Curve Visualizer
Animated bathtub curve showing failure rate phases over component lifetime with configurable screening effectiveness, burn-in period, and wear-out onset parameters.
CCF Beta-Factor Calculator
Interactive IEC 61508 beta-factor checklist tool adapted for automotive systems, computing CCF contribution to PMHF with configurable prevention measure credits.
Multi-Point Fault Analyzer
Visual tool for identifying and analyzing dual-point and multi-point fault combinations in a hardware architecture, showing independence requirements and PMHF contributions.
Failure Rate Data Selector
Interactive database browser for IEC 62380 and SN 29500 failure rate data with application factor calculators, temperature derating curves, and automotive use-case defaults.
FMEDA Builder Worksheet
FeaturedInteractive FMEDA worksheet with guided entry for failure modes, failure rates, diagnostic coverage, and automatic classification of SPF, RF, LF, and MPF contributions.
Explore SimulatorsFMEDA for Redundant Wheel Speed Sensor System
Complete FMEDA walkthrough for a dual-channel wheel speed sensor system used in an ABS application at ASIL-C, covering all fault classifications and SPFM/LFM calculations.
- System architecture definition with sensor, signal conditioning, and MCU interface elements
- Failure mode enumeration for 8 hardware elements with IEC 62380 failure rate sourcing
- Diagnostic coverage assessment for each failure mode and safety mechanism
- SPF, RF, LF, and MPF classification for all 47 identified failure modes
- Beta-factor analysis for CCF between redundant sensor channels
- SPFM and LFM calculation showing ASIL-C target compliance at 98.1% / 92.4%
Wheel Speed Sensor FMEDA
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