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Old 09-18-2013, 09:12 AM
TransEngineer TransEngineer is offline
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Have they run it with a scan tool to see what's actually going on? They should be able to monitor current gear, target gear, and TCC status. That will tell them when the 1-2 upshift starts, when it ends, and whether the TCC is also changing state (maybe that's your extra half-shift).

As far as the shift being "late," have them check the shift point by monitoring throttle angle and output RPM (and seeing when Target Gear changes to 2nd). At 80-90 throttle, 1-2 should occur at 1890 output RPM. At 60 throttle, about 1660 output RPM. At 40 throttle, about 1100 output RPM. At 30 throttle, about 800 output RPM. So see if the shift points are correct (they should be).

Also check the 2C clutch volume index (CVI) and see if it's way high (it should usually be between about 35 and 60, I think).
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