Free Automotive Knowledge Library
Diagnostic procedures, free for every technician
Procedures organized by system, trouble code and symptom. Each one runs in Guided Fault Finding, where you enter the factory specification and your readings and the procedure picks the next test.
Guided Fault Finding with Karz-Ügh AI
Your Automotive Diagnostic Intelligence Assistant · KlutchID — Powered by KlutchAZ
Starting
Engine does not crank
Key or button to START and the engine doesn’t turn over (or only clicks). Separates battery, cable, starter, control-circuit and start-authorization faults.
Symptoms: no crank · clicks when starting · starter not engaging · nothing happens when starting
KlutchID starter procedure · general testing logicNot factory information · Awaiting KlutchAZ review · KlutchID — Powered by KlutchAZ
Version 1 · updated 2026-10-28 · 5 tests, 6 results
Charging
Charging system: battery not charging or charge warning
Battery light on, low or high system voltage, or a battery that keeps going flat while driving.
Codes: P0562, P0563, P0620, P0621, P0622
Symptoms: battery light · charging warning · battery not charging · dim lights · overcharging
KlutchID starter procedure · general testing logicNot factory information · Awaiting KlutchAZ review · KlutchID — Powered by KlutchAZ
Version 1 · updated 2026-10-28 · 4 tests, 6 results
Engine performance
Engine misfire
Misfire codes, rough running or a flashing check-engine light. Narrows a cylinder misfire to ignition, fuel or mechanical.
Codes: P0300-P0312
Symptoms: misfire · rough idle · flashing check engine · shaking · hesitation
KlutchID starter procedure · general testing logicNot factory information · Awaiting KlutchAZ review · KlutchID — Powered by KlutchAZ
Version 1 · updated 2026-10-28 · 6 tests, 6 results
Network / communication
Lost communication with a module
U-codes, a module the scan tool can’t reach, or several unrelated warning lights at once.
Codes: U0001-U0300
Symptoms: no communication · module offline · multiple warning lights · scan tool won’t connect
KlutchID starter procedure · general testing logicNot factory information · Awaiting KlutchAZ review · KlutchID — Powered by KlutchAZ
Version 1 · updated 2026-10-28 · 4 tests, 4 results
Electrical
Battery drains when parked (parasitic draw)
The battery is flat after the vehicle sits, but charges normally when driven.
Symptoms: battery drain · dead battery overnight · flat battery after sitting · parasitic draw
KlutchID starter procedure · general testing logicNot factory information · Awaiting KlutchAZ review · KlutchID — Powered by KlutchAZ
Version 1 · updated 2026-10-28 · 3 tests, 4 results
Factory information sources
Factory manuals, wiring diagrams and bulletins stay with their publishers. KlutchID links to free sources such as Operation CHARM (1982–2013), LEMON and NHTSA, and to the manufacturers’ own sites. It never copies or rehosts them. In a case, cite the exact page you used, or add a document you have permission to use.
Free repair informationContribute
PlannedPublic technician uploads open when technician accounts launch. They’ll include original procedures, confirmed case studies, scan-tool screenshots, waveforms, photos and documents you have the right to share. Each upload will keep its author’s credit and version history, and will be reviewed before it’s published.
- Not published: copyrighted documents without distribution rights.
- Not published: customer records or personal information.
- Case studies are anonymized: VIN shortened, contact details, customer concern and photos removed.
Today, scan-tool screenshots, waveforms, photos, videos and documents can be attached to your own diagnostic cases on this device. Have an original procedure or a confirmed fix to share now? Export the anonymized case study from your case and send it to KlutchAZ for review.
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