DTC Troubleshooting

DTC Troubleshooting: P2279 (109-2)

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 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 any damaged part(s), then go to step 4.

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

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

Does the HDS indicate FAILED?

YES -

Check the camshaft timing and check the valve clearance Adjustments, then go to step 4.

NO -

If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates EXECUTING, keep idling until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 2 and recheck.

4. Reset the PCM with the HDS.

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

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

7. Check for Pending or Confirmed 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 intake manifold, the brake booster, and the brake booster hose, then go to step 1.

NO -

Go to step 8.

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

Does the HDS indicate PASSED?

YES -

Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step 7, go to the indicated DTC's troubleshooting.�

NO -

If the HDS indicates FAILED, go to step 1. If the HDS indicates EXECUTING or OUT OF CONDITION, keep idling until a result comes on.