Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.
Symptom Charts 3-5
No Diagnostic Trouble Codes (DTCs) Present Symptom
Charts
No Diagnostic Trouble Codes (DTCs) Present Symptom Charts
Chart 1
— 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 (Section 5 Pinpoint Test unless noted) |
|---|---|
Check the following parameter identifiers (PIDs): — LONGFT1 or LONGFT2 (value between -20 and +20%) — VPWR (value between 10.5 and 17.0 volts, and within 0.5 volt of battery voltage) | LONGFT1 or LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. LONGFT1 or 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 Workshop Manual Section 414-00, Charging System, Diagnosis And Testing to continue diagnosis. 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. |
Fuel Injection System | 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 PIDs indicate a fault (an injector circuit concern is indicated). For Edge 2.0L, Edge 2.7L, Escape/Kuga 1.6L, Escape/Kuga 2.0L, Expedition, Explorer 2.3L, Explorer 3.5L GTDI, F-150 2.7L, F-150 3.5L GTDI, Fiesta 1.0L, Fiesta 1.6L GTDI, Flex 3.5L GTDI, Focus, Fusion 1.5L, Fusion 2.0L, MKC, MKS 3.5L, MKT 2.0L, MKT 3.5L, MKX 2.0L, MKX 2.7L, MKZ 2.0L, Mustang 2.3L, Navigator, Taurus 2.0L, Taurus 3.5L GTDI, Transit 3.5L and Transit Connect 1.6L, 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 | GO to Pinpoint Test DM. |
Secondary Ignition System | For KA 1.5L TIVCT or Fiesta 1.6L TIVCT, 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 | REFER to the Workshop Manual Section 414-00, Charging System, Diagnosis And Testing to continue diagnosis. |
Universal Heated Oxygen Sensor (HO2S) | GO to Pinpoint Test DZ. |
Automatic Transmission | |
Base Engine | REFER to the Workshop Manual Section 303-00, Engine System, Diagnosis And Testing to continue diagnosis. |
Intake Air System | GO to Pinpoint Test HU. |
2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.