Chart 1

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 TESTS -- GASOLINE MODELS unless noted)
Check the following parameter identifiers (PIDs): DPFEGR (if equipped) (hot idle value within 0.03 volt [E-Series 5.4L] or 0.15 volt [all others] 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 0.03 volt (E-Series 5.4L) or 0.15 volt (all others) of key ON, engine OFF value: For vehicles equipped with an exhaust gas recirculation system module (ESM), GO to Pinpoint Test HH . For all others, GO to Pinpoint Test HE . 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 the 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 INJxF PIDs (the "x" indicates the injector number) with the key ON, engine OFF. There is 1 INJxF PID for each engine cylinder. All INJxF PIDs must indicate no fault (or NO).	The INJxF PID(s) indicate a fault (an injector circuit fault is indicated). For Ford GT, GO to Pinpoint Test HL . For all others, GO to Pinpoint Test KG .
Mass Air Flow (MAF) Sensor	GO to Pinpoint Test DC .
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	GO to Pinpoint Test HX .
Charging System	GO to Pinpoint Test HY .
Automatic Transmission	REFER to the appropriate AUTOMATIC TRANSMISSION article .
Base Engine	REFER to the appropriate ENGINE article .
Intake Air System (for vehicles equipped with an idle air control [IAC] valve)	GO to Pinpoint Test HU .
A/C Pressure (ACP) Sensor	GO to Pinpoint Test DS .
Additional Testing	GO to Pinpoint Test Z .
Additional Checks: Some vehicles have a TQ_CNTL 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 powertrain control module (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.