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 3-11
No Diagnostic Trouble Codes (DTCs) Present Symptom
Charts
NOTE: Driving styles may have a significant influence on fuel economy. Verify the concern before starting an in-depth diagnosis. If available, use the integrated diagnostic system (IDS) fuel economy test to verify a concern is present. The following external factors may contribute to poor fuel economy:
• stop and go driving • incorrect axle ratio
• incorrect tire pressure and size • road or weather conditions
• vehicle loads (such as trailer towing) • aftermarket add ons
• extended winter warm-up conditions • short run operations
• high speed driving • customer expectations
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Check the following 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 PCM power relay. CHECK the VPWR circuit between the PCM and the PCM power relay. CHECK the PWR GND circuits. |
Cooling System | Verify the engine operates at normal temperature. REFER to the Workshop Manual Section 303-03, Engine Cooling, Symptom Chart to diagnose any cooling system concerns that are present. |
Transmission Fluid Level | Visual. |
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. |
Variable Camshaft Timing (VCT) System | GO to Pinpoint Test HK. |
Automatic Transmission | |
Positive Crankcase Ventilation (PCV) System | GO to Pinpoint Test HG. |
Grille Shutter | REFER to the Workshop Manual Section 501-02, Front End Body Panels, to continue diagnosis. |
Additional Checks | Check for base engine or intake air system concerns. Check for a contaminated MAF sensor. REFER to the applicable Workshop Manual section. Check for correct PCM VID block information. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) to CARRY OUT the Making Changes To The VID Block procedure. |
Auto Start Stop System | GO to Pinpoint Test AA. |
Additional Testing | GO to Pinpoint Test Z. |
Chart 11
— Emissions Compliance
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Emissions Related Systems | GO to Pinpoint Test EM. |
Chart 12
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.