Air Induction - MIL ON/DTC's P0171/P2187
24 08 852012966/5
December 22, 2008.
Supersedes Technical Service Bulletin Group 24 number 07-16 dated September 6, 2007 for reasons listed below.
Affected Vehicles
01 MIL on - P2187, Fuel trim too lean at idle
Condition
- MIL on.
- One of the following DTCs are stored in the ECM data memory.
- DTC P2187 (Fuel Trim Bank 1, System too Lean at Idle Speed)
- DTC P0171 (Fuel Trim Bank 1, System too Lean at Idle Speed)
Technical Background
The condition may be the result of the incorrect positioning of the air filter element (see illustration) due to the deformation of the back side of the lower air filter housing. The change in the air flow distribution inside the air filter housing results in an inaccurate output signal from the Mass Air Flow Sensor G70.
Production Solution
Improved air filter housings are installed in production.
Service
If the air filter element cannot be correctly positioned because the lower air filter housing is deformed, replace the air filter housing.
Warranty
Required Parts and Tools
Additional Information
All part and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Dept. and service manuals for the latest information.