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AV-SCANNER / Service function guides / Transmission and driveline

Service function guideTransmission Live Data Diagnosis

This guide teaches working mechanics how to use transmission live data to diagnose slip, temperature and solenoid faults on automatic and dual-clutch transmissions. It explains how the transmission control module (TCM) reports clutch pressures, turbine and output speeds, fluid temperature and solenoid current, and how to interpret those signals under load. You will learn a repeatable road-test and stall-test procedure, how to compare commanded versus actual values, and how to confirm a repair before the vehicle leaves the bay. The result is a diagnostic routine that separates hydraulic, electrical and mechanical failures without guesswork.

CategoryTransmission and driveline
DifficultyProfessional
Time needed60 to 120 minutes
Length12 sections

Guidance is general and covers many makes. Exact procedures and values vary by model, so confirm them in the factory service information for your vehicle.

Keep the full guide

Download all 12 sections as a branded PDF to use in the workshop.

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