Knowledge guideBeginnerEvidence-led
A basic scan can preserve valuable evidence when it records every module available, code status, freeze frame, and readiness before any reset.
Why this matters
Understanding the system principle makes the test result more useful and reduces unnecessary disassembly or parts replacement.
Evidence to capture first
- Vehicle identification
- Stored, pending, and permanent codes
- Freeze frame and readiness
- Battery voltage
A disciplined path
- Connect with ignition off
- Switch on as instructed
- Save or photograph complete results
- Exit without clearing and share the record with the repairer
Decision point
Do not operate a handheld tool while driving and do not leave an unsecured adapter near pedals.
Source desk
Use current model-specific service information for specifications, connector locations, disabling procedures, and tightening values. The following public resources support the broader safety or system context used in this guide.

