Diagnostic Aids
Check for following conditions: A misrouted harness. Inspect MAF sensor harness to ensure harness is not routed too close to secondary ignition wires or coils, solenoids, relays or motors. Deposits on throttle plate or in throttle bore. Unmetered air (any unmetered air entering the engine may cause this DTC to set). Verify oil dipstick is completely seated and oil filler cap is tight. MAF display should increase from 4-7 grams/second at idle to 130 grams/second or more at 1-2 shift during a Wide Open Throttle (WOT) acceleration. If not, inspect for a restriction. Barometric pressure is used in order to calculate predicted mass airflow value, based on MAP sensor reading at key ON. A skewed MAP sensor will cause calculated mass airflow value to be inaccurate. Value shown for MAP sensor display varies with altitude. With ignition on and engine off, approximate value displayed should be about 103 kPa at or near sea level. Value decreases by approximately 3 kPa for every 1000 feet of altitude. Inspect for an unresponsive MAP sensor due to the following conditions: poor vacuum connections, damaged vacuum source, defective vacuum hoses or any unmetered air leaks into the manifold.
If problem is related to aftermarket accessories, check and repair installed equipment. If problem is intermittent, seeINTERMITTENT TROUBLE CODE DETERMINATION under SELF-DIAGNOSTIC SYSTEM.