Circuit/System Verification

IMPORTANT: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

IMPORTANT: Verify that the engine is in good mechanical condition before continuing with this diagnostic.

Verify the integrity of the air induction system by inspecting for the following conditions:

Restrictions in the MAF air induction system and the turbocharger system
Restrictions in the exhaust system-Refer to Restricted Exhaust .
Leaks in the charge air cooler with a J 46091
Leaks at the MAF/IAT sensor O-ring seal
Leaks at the MAP pressure sensor seal
Cracked or damaged MAF sensor housing
Restricted intake air duct or a dirty air filter element
Debris blocking the air sensing filaments of the MAF sensor
A MAF sensor that is installed backwards
An exhaust gas recirculation (EGR) valve that is stuck open-Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .

A skewed MAF sensor will also cause the predicted MAF value to disagree with the actual MAF sensor value. Use the scan tool to compare the MAF Sensor parameter to a known good vehicle under various operating conditions.