LLY Diesel Engine SES/MIL Map Sensor DTCs P0106, P0107 Reduced Engine Power and/or Lack of Performance (Replace AIr Cleaner Outlet Duct)

Some customers may comment on an SES/MIL lamp illuminated with reduced engine power and /or lack of performance. This condition mainly occurs when the vehicle is loaded to near capacity and operating in high ambient temperature areas. Upon further investigation, the technician may find DTCs P0106 and/or P0107.

The air duct between the air cleaner housing and the turbo inlet restricts air flow. The restriction is caused by the duct collapsing under high engine loads. The duct material is not hard enough to prevent collapsing of the airway when the vehicle is operated with extreme underhood temperatures and high air flow demand.

Check to see if the air cleaner outlet duct collapses on acceleration. Use the following test procedure:

1. The engine must be at operating temperature and the outside ambient temperature must be at or above 32°C (90°F).
2. The vehicle must be loaded to near capacity and driven where underhood temperatures are at extreme condition from a four percent or greater road grade.
3. With the vehicle pulled off the road safely and the engine shut off, transmission in Park or Neutral and parking brake set, remove the interior dog house cover and start the engine. Rev the engine to 1500 rpms and observe for a collapsing air cleaner outlet duct.
4. Another way to observe for a collapsing air cleaner outlet duct would be to use two technicians. Open the hood instead of removing the dog house cover. Have one technician rev the engine and the other watch the outlet duct.

If the duct collapses, the duct must be replaced with new P/N 25815251. Refer to Air Cleaner Outlet Duct Replacement in SI. After replacement, any MAP Sensor codes, stored in the ECM, must be cleared.

For vehicles repaired under warranty, use: