Table 1

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

Engine Runs Rough
Engine Misses
Stalls/Quits: Idle, Acceleration, Cruise
Buck/Jerk
Hesitation/Stumble
Surge
Unique Idle Concerns: Rolling Idle

NOTE: The engine may stall if left running while refueling, or it may restart if the ignition is not cycled to ACC or OFF position before refueling. Advise the customer to turn the engine off while refueling to avoid contamination or damage to the evaporative emission (EVAP) system.

SYMPTOM TABLE

SYSTEM/COMPONENT	REFERENCE (Pinpoint Test unless noted)
Check the following parameter identification (PID)s: 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 CHARGING SYSTEM . VPWR between 10.5 and 17.0 volts, but not within 0.5 volt of battery voltage: CHECK B(+) supply to the powertrain control module (PCM) power relay. CHECK the VPWR circuit between the PCM and the PCM power relay. CHECK the PWR GND circuits.
Mass Air Flow (MAF) Sensor	GO to PINPOINT TEST DC .
Secondary Ignition System	GO to PINPOINT TEST JB .
Fuel Delivery System	GO to PINPOINT TEST HC .
Exhaust System	GO to PINPOINT TEST HF .
Positive Crankcase Ventilation (PCV) System	GO to PINPOINT TEST HG .
Evaporative Emissions (EVAP) System	CHECK for EVAP system blockages (engine stalls) or leaks (other symptoms). REFER to EVAPORATIVE EMISSIONS - HYBRID .
Heated Oxygen Sensor (HO2S)	GO to PINPOINT TEST DZ .
Base Engine	REFER to ENGINE SYSTEM - GENERAL INFORMATION .
Intake Air System	GO to PINPOINT TEST HU .
Additional Testing	GO to PINPOINT TEST Z .
Additional Checks: Correct PCM vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . Be aware of the engine RPM/speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS). Driveline and electronically controlled continuously variable transaxle (CVT) Cruise control system (for surge with cruise control on)	REFER to the applicable article in the Workshop Manual.