DTC will set when the following conditions are present:

WARNING: This page is about a different car, the 1997 GMC Pickup and 1997 Chevrolet Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Engine is running.
No TP sensor DTCs are set.
No IAC sensor DTCs are set.
No EGR DTCs are set.
Change in engine speed is less than 100 RPM.
Change in throttle position is less than 1.95 percent.
Change in EGR flow is less than 5 percent.
Change in IAC is less than 5 counts.
No change in brake switch status.
No change in clutch status (manual transmission).
No change in power steering switch status.
No change in A/C clutch status.
Conditions have stabilized for 2 seconds.
Conditions are met for 24 consecutive tests in a sample of 100 tests.
Change in MAP sensor is greater than .68 volt.