Chart 1

WARNING: This page does not describe the selected car, but rather 29 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

Stalls/Quits: Idle, Acceleration, Cruise, Stall After Start
Runs Rough
Misses
Buck/Jerk
Hesitation/Stumble
Surge
Unique Idle Concerns: Rolling Idle
Intermittent Rough Idle

NOTE: For some vehicle applications, the engine may stall if left running while refueling. Advise the customer to turn the engine off while refueling to avoid contamination or damage to the evaporative emission (EVAP) system.

SYSTEM/COMPONENT	REFERENCE (Pinpoint Test unless noted)
Check the following parameter identifiers (PIDs): DPFEGR (if equipped) (hot idle value within 0.15 volt of the key ON, engine OFF value) LONGFT1/LONGFT2 (value between -20 and +20%) VPWR (value between 10.5 and 17.0 volts, and within 0.5 volt of battery voltage)	DPFEGR PID value not within 0.15 volt of key ON, engine OFF value: For vehicles equipped with an exhaust gas recirculation system module (ESM), refer to PINPOINT TEST HH - Exhaust Gas Recirculation System Module (ESM) . For all others, refer to PINPOINT TEST HE - Exhaust Gas Recirculation (EGR) Systems . LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. LONGFT1/LONGFT2 value high (+): Continue diagnosis. Concentrate checks in areas that would cause the engine to run lean. VPWR not between 10.5 and 17.0 volts: REFER to appropriate CHARGING SYSTEM GENERAL INFORMATION article . VPWR between 10.5 and 17.0 volts, but not within 0.5 volt of battery voltage: CHECK the B+ voltage 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.
For vehicles that run rough at idle: Check the INJx_F PIDs (the "x" indicates the injector number) with the key ON, engine OFF. There is 1 INJx_F PID for each engine cylinder. All INJx_F PIDs must indicate no fault (or NO).	The INJx_F PID(s) indicate a fault (an injector circuit concern is indicated), refer to PINPOINT TEST KG - Fuel Injector .
Mass Air Flow (MAF) Sensor	refer to PINPOINT TEST DC - Mass Air Flow (MAF) Sensor .
Secondary Ignition System	For vehicles equipped with a coil pack ignition system, refer to PINPOINT TEST JC - Secondary Ignition (Coil Pack) . For all others, refer to PINPOINT TEST JB - Secondary Ignition (COP) .
Fuel Delivery System	refer to PINPOINT TEST HC - Fuel Delivery System .
Exhaust System	refer to PINPOINT TEST HF - Catalyst Efficiency Monitor and Exhaust Systems .
Positive Crankcase Ventilation (PCV) System	refer to PINPOINT TEST HG - Positive Crankcase Ventilation (PCV) System .
EVAP System	refer to PINPOINT TEST HX - Evaporative Emission (EVAP) Monitor and System .
Charging System	refer to PINPOINT TEST HY - Generator/Regulator System .
Automatic Transmission	REFER to appropriate AUTOMATIC TRANSMISSION/TRANSAXLE article.
Base Engine	REFER to the appropriate ENGINE article.
Intake Air System (for vehicles equipped with an IAC valve)	refer to PINPOINT TEST HU - Intake Air Systems .
A/C Pressure (ACP) Transducer Sensor	refer to PINPOINT TEST DS - Air Conditioning Pressure (ACP) Sensor .
Additional Testing	refer to PINPOINT TEST Z - Intermittent .
Additional Checks: Some vehicles have a TQ_CNTRL PID available. Check this PID to determine if the PCM is reducing torque, and if so, why the torque is being reduced. As a PID display example; 0 equals no torque reduction requested, 1 equals torque truncation, which cuts fuel to protect when line pressure falls to minimum limit and 2 equals traction control event, which cuts fuel/spark for traction control. Correct PCM vehicle identification (VID) block information. Refer to, FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . Be aware of engine RPM/speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS, VSS, or OSS). Verify the fuel filler cap is properly tightened and not physically damaged. Drivelines Manual transmission/clutch Charging system Traction control system (if equipped) A/C system (for surge with A/C on) Speed control system (for surge with speed control on) A/C compressor diode, if equipped (for rolling idle)	REFER to the applicable service information article.