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.
3-10 Symptom Charts
No Diagnostic Trouble Codes (DTCs) Present Symptom
Charts
(Continued)
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
component or system, if any, is requesting a torque reduction. — Customer driving habits — Correct PCM vehicle identification (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. — Intake manifold runner control (IMRC) linkage (if equipped) — Clutch (M/T) — Charging system — Engine RPM or speed limiting functions of the PCM (look for incorrect high vehicle speed signal from ABS or VSS) | |
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 Section 1, Powertrain Control Software for additional information. |
Chart 9
— Spark Knock
NOTE: Carbon build up in the combustion chamber and on the back of valves can be a contributing factor for engine spark knock concerns. Remove carbon deposits prior to any component replacements.
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Cooling System | Verify the engine operates at normal temperature. REFER to the Workshop Manual Section 303-03, Engine Cooling, The Engine Overheats or No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index to diagnose any cooling system concerns that are present. Verify correct coolant level and coolant concentration. REFER to the Workshop Manual Section 303-03, Engine Cooling, Cooling System Draining, Filling and Bleeding for correct coolant concentrations and fill procedures. |
Mass Airflow (MAF) Sensor | GO to Pinpoint Test DC. |
Base Engine | REFER to the Workshop Manual Section 303-00, Engine System, Diagnosis And Testing to continue diagnosis. |
Fuel Delivery System | GO to Pinpoint Test HC. |
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. |
Positive Crankcase Ventilation (PCV) System | GO to Pinpoint Test HG. |
Engine Oil Quality | Visual. |
Additional Testing | GO to Pinpoint Test Z. |
Chart 10
— Poor Fuel Economy
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.