Diagnostic trouble code information
Condition
The engine control module (ECM) calculates a value for air mass using the signal from the boost pressure sensor and the air temperature sensor. The control module compares the calculated value to the signal from the mass air flow sensor. The diagnostic trouble code (DTC) is generated if the sensor signal does not match the calculated value.
The diagnostic trouble code can be diagnosed when the ignition is on.
Substitute Value
- Fuel system diagnostics is blocked.
- The control module makes air mass calculations with the help of the boost pressure sensor and the air temperature sensor.
Possible Source
- Contact resistance in the terminals
- Air leaks in the induction system.
- Damaged boost pressure sensor 2 (MAP).
- Damaged mass air flow sensor.
Fault symptom[s]
- Malfunction indicator lamp lit.