Diagnostic Aids
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Inspect for the following conditions:
- Any unmetered air-Any unmetered air that enters the engine downstream of the MAF sensor may cause this DTC to set.
- A sluggish or unresponsive MAF sensor-A short between the signal circuit of the MAF sensor and the signal circuit of the intake air temperature (IAT) sensor. This will cause the MAF sensor to have a very limited output voltage range.
- Any debris that may be blocking the sensing elements of the MAF sensor
- Any water in the air induction system
- The MAF display should increase from 42-50 g/s at idle to 420 g/s or more at the 2-3 shift during a wide-open throttle (WOT) acceleration. If not, inspect for a restriction in the induction system or the exhaust system.
- If the condition is intermittent, refer to Intermittent Conditions .