Originally Posted by nash

I discovered it is possible to go straight into stage 4 on restarting a warm engine. Power on the TCH and drive until about 30 seconds after the ICE starts. This time appears to be a "catalyst reheat" mode. After the ICE has been running roughly 30 seconds coast. The ICE will stop within a few seconds and you are in stage 4. Test by blipping the accelerator to restart the ICE and coast. The ICE should shut back off almost immediately. I've had this work at speeds under 30mph.