Chart 7

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

Poor Fuel Economy

NOTE: Since driving styles can have a significant influence on fuel economy, verify the concern before starting an in-depth diagnosis. Also, the following external factors may contribute to poor fuel economy conditions:

stop and go driving
incorrect tire pressure/size
vehicle loads (such as trailer towing)
extended winter warm-up conditions
high speed driving
regenerative braking disabled
high voltage traction battery temperatures
incorrect axle ratio
road/weather conditions
aftermarket add-ons
short run operations
customer expectations

SYSTEM/COMPONENT	REFERENCE ( ENGINE CONTROLS - PINPOINT TESTS -- FUSION HYBRID, MILAN HYBRID & MKZ HYBRID unless noted)
Transaxle Fluid Level	Visual. REFER to the ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT)
Check the following PIDs: LONGFT1 (value between -20 and +20) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volt of battery voltage)	LONGFT1 value low (-): Continue diagnosis. Concentrate checks in areas that cause the engine to run rich. LONGFT1 value high (+): Continue diagnosis. Concentrate checks in areas that cause the engine to run lean. VPWR not between 10.5 and 17.0 volts: REFER to the CHARGING SYSTEM VPWR between 10.5 and 17.0 volts, but not within 0.5 of battery voltage: CHECK the B+ supply to the power relay. CHECK the VPWR circuit between the PCM and the power relay. CHECK the PWR GND circuits.
Verify the engine operates at normal temperature.	Visual. REFER to the ENGINE COOLING SYSTEM (HYBRID) , to diagnose any cooling system concerns that are present.
Secondary Ignition System	GO to PINPOINT TEST JB .
Fuel System	GO to PINPOINT TEST HC .
Exhaust System	GO to PINPOINT TEST HF .
Variable Camshaft Timing (VCT) System	GO to PINPOINT TEST HK .
Automatic Transaxle	REFER to the ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT)
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
Additional Checks: Correct powertrain control module (PCM) vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . Brake drag Base engine concerns Incorrect PCV valve Contaminated mass air flow (MAF) sensor Intake air system	REFER to the appropriate Service Information.
Additional Testing	GO to PINPOINT TEST Z .