TechnicianVision · Knowledge base
Fuel Economy Technology Systems: Automatic Transmission
I-CAR · July 24, 2019
Summary
This article highlights the complexity of modern automatic transmissions (including 8-10 speed units and CVTs) and their reliance on computer controls to optimize fuel economy. It emphasizes that collision damage or battery disconnection can disrupt these systems, requiring diagnostic scanning and specific calibration or relearn procedures.
What to do on the job
Perform a diagnostic scan and research OEM-specific calibration or learn procedures for the transmission after any collision repair or battery disconnection.
How to use it
Use this document to justify the necessity of pre- and post-repair scanning, as well as transmission relearn/calibration procedures on estimates and supplements. It establishes that even if no physical transmission damage is visible, computer sensitivity and battery disconnection can disrupt transmission operation and fuel efficiency, requiring OEM-specified electronic resets.
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