Chart 1

WARNING: This page is about a different variant/trim than selected.

Stalls/Quits: Idle, Acceleration, Cruise, Stall After Start
Runs Rough
Misses
Buck/Jerk
Hesitation/Stumble
Surge
Unique Idle Concerns: Rolling 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 TESTS unless noted)
Check the following parameter identifiers (PIDs): DPFEGR (if equipped) (hot idle value within 0.15 volt of the ignition ON, engine OFF value) LONGFT1/LONGFT2 (value between -20 and +20%) VPWR (value between 10 and 17.0 volts, and within 0.5 volt of battery voltage)	DPFEGR PID value not within 0.15 volt of ignition ON, engine OFF value: GO to PINPOINT TEST HH . 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 and 17.0 volts: REFER to the appropriate Charging System article and CARRY OUT the Inspection and Verification to continue diagnosis. VPWR between 10 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 ignition ON, engine running. There is 1 INJx_F PID for each engine cylinder. All INJx_F PIDs must indicate NO FAULT.	The INJx_F PID(s) indicate a fault (an injector circuit concern is indicated). For Edge 2.0L, Explorer 2.0L, F-150 3.5L, Flex GTDI 3.5L, Focus, MKS 3.5L, MKT 3.5L and Taurus GTDI 3.5L vehicles, GO to PINPOINT TEST DI . For all others, GO to PINPOINT TEST KG .
Mass Airflow (MAF) Sensor	GO to PINPOINT TEST DC .
Manifold Absolute Pressure (MAP) Sensor	For F-150 3.5L, Flex GTDI 3.5L, MKS 3.5L, MKT 3.5L and Taurus GTDI 3.5L, GO to PINPOINT TEST DN . For all others, GO to PINPOINT TEST DM .
Secondary Ignition System	For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, 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 .
EVAP System	For Fiesta, GO to PINPOINT TEST HZ . For all others, GO to PINPOINT TEST HX .
Charging System	Visual. REFER to the appropriate Charging System article and CARRY OUT the Inspection and Verification to continue diagnosis.
Universal Heated Oxygen Sensor (HO2S)	For E-Series 4.6L, E-Series 5.4L, Edge, Escape, Expedition, Explorer, F-150, F-Series Super Duty, Flex, Focus, Fusion 2.5L, Fusion 3.0L, MKS, MKT, MKX, Mustang, Navigator, and Taurus, GO to PINPOINT TEST DZ .
Automatic Transmission	REFER to the appropriate Automatic Transaxle/Transmission article, Diagnosis By Symptom to continue diagnosis.
Base Engine	REFER to the appropriate Engine System - General Information and CARRY OUT the Inspection and Verification to continue diagnosis.
Intake Air System	GO to PINPOINT TEST HU .
Fuel Injection System	For Edge 2.0L, Explorer 2.0L, F-150 3.5L, Flex GTDI 3.5L, Focus, MKS 3.5L, MKT 3.5L and Taurus GTDI 3.5L vehicles, GO to PINPOINT TEST DI . For all others, GO to PINPOINT TEST KG .
Additional Testing	GO to PINPOINT TEST Z .
Additional Checks: Some vehicles have a TQ_CNTRL PID available. Check this PID to determine if the PCM is reducing torque. The TQ_CNTRL PID may indicate which component or system, if any, is requesting a torque reduction. Correct PCM vehicle identification (VID) block information. Refer to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) to carry out the Making Changes to the VID Block procedure. 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 correctly tightened or the capless fuel tank filler pipe is correctly sealed 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)	REFER to the appropriate Service Information article .
Brake Over Accelerator	CHECK for simultaneous brake pedal and accelerator pedal operation inadvertently activating the brake over accelerator feature. CHECK the BRKOVR_ACTION, BRKOVRD_POSS, and DIST_BRKOVRD PIDs for recent simultaneous brake pedal and accelerator pedal operation. ADVISE the customer that simultaneous brake pedal and accelerator pedal operation by the vehicle operator activates the brake over accelerator feature. REFER to POWERTRAIN CONTROL SOFTWARE for additional information.