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.
3-8 Symptom Charts
No Diagnostic Trouble Codes (DTCs) Present Symptom
Charts
NOTE: If the vehicle runs normally with the ignition in the OFF position, check for a damaged ignition switch, an IGN START/RUN or ISP-R circuit short to voltage, or a VPWR circuit short to voltage.
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Base Engine | Check for air leaks, including correct sealing of intake manifold and components or vacuum lines attached to intake air (such as the PCV or EGR valve or vacuum lines). REFER to the Workshop Manual Section 303-00, Engine System, Diagnosis And Testing to continue diagnosis. |
Cooling System | Verify the engine operates at normal temperature. REFER to the Workshop Manual Section 303-03, Engine Cooling or No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index, to diagnose any cooling system concerns that are present. |
Intake Air System Leaks | GO to Pinpoint Test HU. |
Additional Testing | For the vehicle runs normally with the ignition in the OFF position, GO to Pinpoint Test B. For all others, GO to Pinpoint Test Z. |
Chart 6
— Unique Idle Concerns: Low/Slow Idle — Stalls/Quits: Deceleration
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Automatic Transmission (stalls or quits on deceleration) | |
Fuel Delivery System | GO to Pinpoint Test HC. |
Intake Air System | GO to Pinpoint Test HU. |
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. |
Base Engine | REFER to the Workshop Manual Section 303-00, Engine System, Diagnosis And Testing to continue diagnosis. |
Additional Testing | GO to Pinpoint Test Z. |
Chart 7
— Backfires
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Secondary Ignition | 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. |
Base Engine | REFER to the Workshop Manual Section 303-00, Engine System, Diagnosis And Testing to continue diagnosis. |
Exhaust System | GO to Pinpoint Test HF. |
Additional Testing | GO to Pinpoint Test Z. |
Chart 8
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.