AutoDiagnos 9511461 A0104‑1 Multi‑Tester Plus is an industrial diagnostic controller used to interface with ECUs and other embedded systems. Common failure modes for this class of equipment include power‑supply voltage drops or ripple, firmware corruption or boot‑loader errors, connector pin degradation on the diagnostic port, and thermal stress causing component failure (e.g., op‑amps, voltage regulators). Begin troubleshooting by verifying that the unit receives its rated input voltage with a multimeter and checking for any visible signs of overheating or burnt components; then inspect all connectors for corrosion or loose pins, followed by a firmware integrity check via the manufacturer’s diagnostic software.[oss-gpt-20b]