DTC Advanced Diagnostics: P2279
DTC P2279:Intake Air System Leak

General Description

The diagnosis describes the leakage detection in the intake manifold based on the measured and modeled intake air pressure. If the difference between measured and modeled intake manifold pressure is a specified value, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
2 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Elapsed time after starting the engine
5 seconds
–
Engine coolant temperature [ECT Sensor 1]
-54 °F (-48 °C)
289.9 °F (143.3 °C)
Engine speed [Engine Speed]
640 rpm
7,200 rpm
Other
Manifold absolute pressure (MAP) sensor value is valid
EVAP system monitor is not running for at least 5 seconds
[ ]: HDS Parameter

Malfunction Threshold
The difference between measured and modeled intake manifold pressure is greater than 6.5 kPa (49 mmHg, 1.92 inHg) - 12.5 kPa (94 mmHg, 3.70 inHg).

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Intake manifold air leak

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.