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 TP sensor DTCs are set.
No MAF DTCs are set.
No IC control DTCs are set.
No VSS DTCs are set.
No crankshaft position sensor DTCs are set.
Rough road condition is not detected.
Engine coolant temperature is 20-203°F (-6.75 to 95°C).
Engine speed is 600-5600 RPM.
System voltage is 9-16 volts.
Positive throttle position change is less than 4.9 percent for 100 milliseconds.
Negative throttle position change is less than 2.9 percent for 100 milliseconds.
Misfire is detected.