DTC Troubleshooting

DTC Troubleshooting: P2279

DTC P2279: Intake Air System Leak Detected

NOTE:

- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information. Initial Inspection and Diagnostic Overview

- If DTC P0443 is stored at the same time as DTC P2279, troubleshoot DTC P0443 first, then recheck for DTC P2279.

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 the leaking part(s), then go to step 4.


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

3. Monitor the OBD STATUS for DTC P2279 in the DTCs MENU with the HDS.

Does the screen indicate FAILED?
YES - Check the camshaft timing, Cam Chain Installation then go to step 4.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at this time. If the screen indicates NOT COMPLETED, go to step 2 and recheck.


4. Reset the ECM with the HDS.

5. Do the ECM idle learn procedure. ECM Idle Learn Procedure

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

7. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2279 indicated?
YES - Check for vacuum leaks at the PCV valve, the PCV hose, the purge (PCS) line, the throttle body, the brake booster, or the brake booster hose, then go to step 4.

NO - Go to step 8.


8. Monitor the OBD STATUS for DTC P2279 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in step 7, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, go to step 1 and recheck. If the screen indicates NOT COMPLETED, keep idling until a result comes on.