DTC Troubleshooting: P2279
DTC P2279: Intake Air System Leak
NOTE:
Before you troubleshoot, record all freeze data and any on-board snapshot, and 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
Freeze Frame
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

Are the parts OK?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Repair or replace any leaking part(s), then do the repair verification.
2.
Problem verification:

Problem verification
?1.
Let the engine cool until the value of ECT SENSOR 1 is 140 °F (60 °C) or less.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    

?2.
Clear the DTC with the HDS.


?3.
Start the engine, and let it idle for 10 seconds or more.

?4.
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
     
     
     
The failure is duplicated. Check the camshaft timing and adjust it if needed. If the cam timing is OK then check the valve adjustment and set to specification, then do the repair verification.
     
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 HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 2-1 and recheck.?
Repair verification (OBD STATUS check):

?1.
Press the engine start/stop button to select the OFF mode.

?2.
Reconnect all connectors.

?3.
Press the engine start/stop button to select the ON mode.

?4.
Reset the PCM with the HDS.


?5.
Do the PCM idle learn procedure.

?6.
Let the engine cool until the value of ECT SENSOR 1 is 140 °F (60 °C) or less.
Signal
Current conditions
Values
Unit
ECT SENSOR 1
    

?7.
Start the engine, and let it idle for 10 seconds or more.

?8.
Monitor the OBD STATUS for DTC P2279 with the HDS.
DTC Description
OBD Status
P2279 Intake Air System Leak
 


Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION

     
PASSED
     
     
     
Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to indicated DTC's troubleshooting.?
     
FAILED
     
     
     
Go to step 1 and recheck.
     
EXECUTING
     
     
     
Keep the test condition until a result comes on.
     
OUT OF CONDITION
     
     
     
Meet the test condition, and check the OBD STATUS again.