DTC will set when the following conditions are present:

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1997 GMC Savana Special, 1997 GMC Savana Camper Special, 1997 GMC Savana, 1997 Chevrolet RV Cutaway, and 1997 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

No IAC DTCs are set.
No HO2S DTCs are set.
No TP sensor DTCs are set.
No MAP sensor DTCs are set.
No EGR DTCs are set.
No EVAP DTCs are set.
No ECT sensor DTCs are set.
No misfire DTCs are set.
Throttle position is less than 69.9 percent.
Engine speed is greater than 575 RPM but less than 4500 RPM.
BARO is greater than 70 kPa.
ECT is greater than 32°F (0°C) but less than 208°F (98°C).
MAP is greater than 20 kPa but less than 98.9 kPa.
IAT is greater than -4°F (-20°C) but less than 158°F (70°C).
Airflow greater than 3 gm/s but less than 150 gm/s.
Vehicle speed is less than 85 MPH.
Average short term fuel trim is not greater than 115.