Test Procedure
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
- HU1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
- Is DTC P2279 present?
Yes No GO to HU2. For all other DTCs, REFER toDIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
For all other symptoms, GO to HU2. - HU2 CHECK THE INTAKE AIR SYSTEM FOR LEAKS, OBSTRUCTIONS AND DAMAGE
- Remove the air cleaner element. Check the air cleaner for restrictions.
- Check for restrictions between the air inlet and the throttle body.
- Are any restriction concerns present?
Yes No REMOVE the restriction.
INSTALL a new air cleaner element.
CLEAR the DTCs. REPEAT the self-test.INSTALL the air cleaner element.
GO to HU3. - HU3 CHECK FOR VACUUM LEAKS
- Listen for vacuum leaks from the following:
- cracked or punctured inlet air tube
- loose connections on the inlet air tube at the air cleaner housing or throttle body
- intake manifold assembly or gasket
- vacuum supply connectors and hose
- Are any concerns present?
Yes No REPAIR as necessary.
CLEAR the DTCs. REPEAT the self-test.GO to HU4. - Listen for vacuum leaks from the following:
- HU4 CHECK THE THROTTLE BODY FOR EXCESSIVE WEAR
- Key in OFF position.
- Remove the throttle body assembly. Refer to FUEL CHARGING AND CONTROLS - HYBRID .
- Inspect the throttle body for:
- excessive wear or grooving in the throttle bore
- misaligned or worn throttle plate
- excessive gap between the throttle bore and plate
- Are any concerns present?
Yes No INSTALL a new throttle body assembly.
CLEAR the DTCs. REPEAT the self-test.RETURN to the SYMPTOM CHARTS article, Symptom Charts for further direction.