Diagnostic Aids

Check for the following conditions: A misrouted harness. Inspect MAF sensor harness to ensure it is not routed too close to secondary ignition wires or coils, solenoids, relays or motors. Low minimum air rate. A low minimum air rate may cause this DTC to set during deceleration. Check for a plugged or collapsed intake air duct, dirty air filter element, blocked MAF sensor air inlet screen or throttle bore, and throttle plate coking. Any unmetered air entering engine may cause this DTC to set. Inspect for vacuum leaks anywhere downstream of MAF sensor. Check for vacuum or PCV system leaks, incorrect PCV valve, engine oil dipstick not fully seated or engine oil filler cap loose or missing. A Wide Open Throttle (WOT) acceleration from a stop should cause mass airflow display on a scan tool to increase from about 4-7 grams/second at idle to about 130 grams/second or more at time of 1-2 shift. If not, inspect for a restriction. If vehicle condition may be related to aftermarket accessories, check accessory installation.

If problem is intermittent, see INTERMITTENT TROUBLE CODE DETERMINATION  under SELF-DIAGNOSTIC SYSTEM.