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	Freeze Frame
P2279 Intake Air System Leak

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

Are the parts OK?


	YES

Go to step 2.


	NO

Repair or replace any leaking part(s).?

Problem verification:

Problem verification

?1.

Let the engine cool until the value of ECT SENSOR 1 is 122 °F (50 °C) or less.

Signal	Current conditions
Signal	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, check the valve adjustment and set to specification.?


	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 freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/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.?