Conditions For Setting DTC
WARNING: This page is about a different car, the 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
The AF ECM monitors that the SHORT Term Fuel Trim is at -50 percent for at least 5 seconds continuously OR the AF ECM monitors that the LONG Term Fuel Trim is at -45 percent for at least 5 seconds continuously.