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Transmissions and Scan Tools

Even with codes and data stream information, you must be able to think like the transmission to find the correct diagnosis, which typically doesn’t involve replacing the entire transmission.

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The transmission game has changed. Solenoids, sensors and computers have replaced vacuum lines, governors and kick-down cables on modern automatic transmissions. The tools have also changed: Scan tools, scopes and meters have replaced pressure and vacuum gauges.

Even with codes and data stream information, you must be able to think like the transmission to find the correct diagnosis, which typically doesn’t involve replacing the entire transmission.

Thinking like a transmission means understanding what information the transmission has, how it interprets that information and how it uses the information to select the correct forward gearing. You also have to understand how the transmission prioritizes performance when it is compromised…

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