Test Procedure
- HU1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS)
Is DTC P1145 or P2279 present?
Yes No For DTC P1145, GO to HU3.
For DTC P2279, GO to HU2.For all other DTCs, REFER to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
For all other symptoms, GO to HU2. - HU2 CHECK THE INTAKE AIR SYSTEM FOR LEAKS AND DAMAGE
- Listen for vacuum leaks from the following:
- loose connections on the intake air tube at the air cleaner housing or throttle body
- cracked or punctured intake air tube
- worn gaskets between the mass air flow (MAF) sensor and the air cleaner assembly
- vacuum supply connectors and hose
- intake manifold assembly or gasket
- exhaust gas recirculation (EGR) valve gasket leak to intake manifold
- verify the integrity of the positive crankcase ventilation (PCV) system and the proper PCV valve part number
- improperly seated engine oil dipstick, tube or oil fill cap
- aftermarket accessories and performance modifications
Are any concerns present?
Yes No REPAIR as necessary.
Clear the PCM DTCs. REPEAT the self-test.GO to HU3. - Listen for vacuum leaks from the following:
- HU3 CHECK THE THROTTLE BODY FOR EXCESSIVE WEAR
- Ignition OFF.
- Remove the throttle body assembly. Refer to the appropriate Fuel Charging and Controls article.
- 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.
REFER to the appropriate Fuel Charging and Controls article.
Clear the PCM DTCs. REPEAT the self-test.RETURN to SYMPTOM CHARTS -- ESCAPE HYBRID article for further direction.