Condition 2

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The engine speed is less than 50 RPM for 0.3 second; then 50-525 RPM for 0.025 second; then the engine speed is greater than 525 RPM.
The vehicle speed is less than 8 km/h (5 mph).
Engine RPM sequence must occur within 30 seconds of key on.
The PCM detects the gear range D2, D4 or REVERSE before and after start up.
All conditions are met for 7 seconds and AT ISS is greater than 200 RPM.