Technical Definition:

Manifold Absolute Pressure (MAP) / Mass Air Flow (MAF) Throttle Position Correlation

Technical Description:

Possible Causes:

• Vacuum leaks between the mass airflow sensor and intake manifold and loose or cracked hoses
• Dirty air cleaner
• Leak in the intake manifold or sections
• Faulty sensor
• Coked intake runner behind throttle body
• Poor or corroded electrical connectors
• Obstruction to air flow
• Defective electronic throttle body
• Obstruction in hose from intake manifold to MAP sensor

Possible Symptoms:

• The service engine soon or check engine light will illuminate.
• Rough running engine – the computer will set the above code and additional codes depicting the faulty sensor if the problem is electrical.Without the correct airflow the engine will develop a rough idle, and depending on the severity, it may not accelerate or have a serious dead spot off idle. In short, it will run lousy

Throttle Position Sensor Inconsistent with the Mass Air Flow Sensor

Possible Solutions:

OBD-II Trouble Code Type:

Diagnostic Step:

Tech Notes:

– Faulty Mass Air Flow (MAF) sensor
– Large vacuum leak
– Leaking air duct system
– Mass Air Flow (MAF) poor electrcial connection
– Manifold Absolute Pressure (MAP) poor electrcial connection
– Faulty Manifold Absolute Pressure (MAP) sensor
– TP sensor not seated properly
– Faulty Throttle Position (TP) sensor

Specific Makes: