System Interface Explorer
Inspect eight kinds of evidence that connect a command to an actual mechanical or hydraulic result.
Four Cross-System Evidence Journeys
Follow the evidence from an observed complaint through the most discriminating authorized test.
Cross-System Test Lab
These fictional activities show why command, electrical energy, mechanical motion and hydraulic output must be distinguished. They are not actual service procedures or OEM limits.
Energy-chain bench · command is not output
Select a fictional fault state. The model changes the observed electrical feed, motor movement and useful output independently.
Controller command
ON (fictional)
Delivered electrical energy
Not observed yet
Mechanical motion
Not observed yet
Useful hydraulic/physical result
Not observed yet
Select Observe chain. A controller command alone does not demonstrate the physical output.
Measure under comparable conditions
Compare an invented unloaded reading and the corresponding operating-state reading. This is a conceptual load-effect illustration, not a test specification.
Choose a pair and compare.
Test conditions must be meaningful before interpreting a measurement difference.
Evidence board — inspect the essential facts
Choose an evidence card.
Choose the supported next step
No simulation result verifies an actual vehicle, establishes practical competence or authorizes a repair.
Cross-System Diagnostic Challenges
Six fictional scan-data decisions: preserve context, check source meaning and select the supported next action.
08.4 · Knowledge Check
Answer all ten questions for a browser-local knowledge score. This does not measure hands-on diagnostic competency.
Continue learning
Return to Course Player · Complaint Intake · 08.1 · Service Information · 08.2 · Scan Tools & Gateways · 04.5
Fictional scan captures and OBD descriptions are educational only. Confirm support and applicability before any authorized real-world diagnosis.