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 3-9
No Diagnostic Trouble Codes (DTCs) Present Symptom
Charts
— Lack/Loss of Power
NOTE: Verify the symptom is reported under normal driving conditions without excessive engine or vehicle load. Also, be aware of the engine RPM and speed limiting functions of the PCM.
NOTE: For vehicles equipped with a knock sensor (KS), a lack of power may result when the vehicle is operated with a breakout box installed at the PCM. The KS circuits are not shielded in a breakout box, and KS signal noise may be noticed by the PCM. If this happens, spark timing is retarded and a lack of power may result.
NOTE: For applications with a KS, a lack of power may result if the engine has developed an abnormal noise. The KS may interpret some abnormal noise as detonation and retard spark timing.
SYSTEM/COMPONENT | REFERENCE (Section 5 Pinpoint Test unless noted) |
|---|---|
Automatic Transmission Fluid | Visual. |
Air Cleaner Element | Visual. |
Check the following PIDS: — LONGFT1 or LONGFT2 (value between -20 and +20%) — IMTV_F (if equipped): For both ignition ON, engine OFF and ignition ON, engine running with the transmission in PARK/NEUTRAL and the engine RPM greater than 3,000 RPM, the PID should indicate NO FAULT in both situations. | 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. IMTV_F PID indicates a fault: GO to Pinpoint Test HU. |
Fuel Delivery System | GO to Pinpoint Test HC. |
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. |
Mass Airflow (MAF) Sensor | GO to Pinpoint Test DC. |
Exhaust System | GO to Pinpoint Test HF. |
Variable Camshaft Timing (VCT) System | GO to Pinpoint Test HK. |
Accelerator Pedal Position (APP) Sensor | GO to Pinpoint Test DK. |
Base Engine | REFER to the Workshop Manual Section 303-00, Engine System, Diagnosis And Testing to continue diagnosis. |
Automatic Transmission | |
Brake System Drag Or Binding | |
Turbocharger System | GO to Pinpoint Test HN. |
Additional Testing | GO to Pinpoint Test Z. |
Additional Checks: Visual. REFER to the applicable Workshop Manual section. — Some vehicles have a
TQ_CNTRL PID available. Check this PID to determine if the PCM is reducing torque. The TQ_CNTRL PID may indicate which
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.