DTC Troubleshooting: P2279
DTC P2279: Intake Air System Leak
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If DTC P0443 is stored at the same time as DTC P2279, troubleshoot DTC P0443 first, then recheck for DTC P2279.

DTC Description
Confirmed DTC
Pending DTC
P2279 Intake Air System Leak
    

1.
Intake air system visual check:

Intake air system visual check
?1.
Check for vacuum leaks at these parts:
PCV valve
PCV hose
Purge (PCS) line
Throttle body
Intake manifold
Brake booster
Brake booster hose
All parts through the turbocharger to the throttle body

Are the parts OK?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Repair or replace any leaking part(s).?
2.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle for 1 minute.

?5.
Monitor the OBD STATUS for DTC P2279 with the HDS.
DTC Description
OBD Status
P2279 Intake Air System Leak
 

Does the HDS indicate FAILED?

     
YES
     
     
     
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for vacuum leaks at the PCV valve, the PCV hose, the purge (PCS) line, the throttle body, the intake manifold, the brake booster, and the brake booster hose. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 2-1 and recheck.?