Saab auto trans. design is that way.... - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Saab auto trans. design is that way....
Posted by REM in Seattle (more from REM in Seattle) on Wed, 2 Oct 2002 09:33:20
In Reply to: Weird auto trans behavior, question, Ed NC, Wed, 2 Oct 2002 08:50:52
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The Engine Control Unit (ECU) signals the automatic Transmission Control Unit (TCU) when to shift based on info from engine temperature, engine RPMs, and throttle position sensor. To help heat the catalytic convertor faster and to reduce exhaust emissions, the ECU tells the TCU not to shift at low RPMS when the engine is cold.
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