Chart 7

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.

- 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/go driving
improper tire pressure/size
vehicle loads (such as trailer towing)
extended winter warm-up conditions
high speed driving
regenerative braking disabled
high traction battery temperatures

improper axle ratio
road/weather conditions
aftermarket add-ons
short run operations
customer expectations

SYSTEM/COMPONENT	REFERENCE (Pinpoint Test unless noted)
Transaxle Fluid Level	Visual. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - 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 GENERATOR AND REGULATOR . 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 ENGINE COOLING - HYBRID , to diagnose any cooling system concerns that are present.
Secondary Ignition System	refer to PINPOINT TEST JB .
Fuel System	refer to PINPOINT TEST HC .
Exhaust System	refer to PINPOINT TEST HF .
Automatic Transaxle	REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - ELECTRONICALLY CONTROLLED CONTINUOUSLY VARIABLE TRANSMISSION (ECVT) .
PCV System	refer to PINPOINT TEST HG .
Additional Checks: Correct PCM vehicle identification (VID) block information. Refer to Section 2, FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . Brake drag Base engine concerns Incorrect PCV valve Contaminated MAF sensor Intake air system	REFER to the appropriate article.
Additional Testing	refer to PINPOINT TEST Z .