Code Enable Criteria

WARNING: This page is about a different car, the 2001 GMC Savana, 2001 Chevrolet RV Cutaway, 2001 Chevrolet Cutaway, and 2001 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Engine is running.
Ignition 1 voltage is 11-18 volts.
Throttle Position (TP) sensor angle is steady within a range of 5 percent or less.
TP sensor angle is less than 95 percent.
MAP sensor is less than 80 kPa.
DTCs P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0121, P0122, P0123, P0335, P0336, P0401, P0440, P0442, P0443, P0446, P0449, P1106, P1107, P1111, P1112, P1121, P1122, P1441 are not set.
Conditions are present for at least 2 seconds.

DTC sets when actual MAF sensor frequency signal is not within a predetermined range of calculated MAF value for more than 8 seconds.