Condition No. 2 For Setting DTC P1870

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The TCC slip speed is 100-550 for 10 seconds, and the PCM commands maximum line pressure.
The TCC slip speed is 100-550 for 12.5 seconds, and the PCM commands the TCC off for 2 seconds.
The TCC slip speed is 100-550 for 15 seconds.