Charts

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.

3-12 Symptom Charts

No Diagnostic Trouble Codes (DTCs) Present Symptom

— Warning Indicators: Check Fuel Cap, Malfunction Indicator Lamp (MIL), Power Take Off (PTO), Temperature Warning Indicator Or

Gauge (applications with cylinder head temperature [CHT] sensor only), Transmission Control Indicator Lamp (TCIL), Powertrain Malfunction Indicator (Wrench)

— PTO Concerns: Not Working Correctly

NOTE:

— If the symptom is both a MIL on and exhaust emission test failure, GO directly to Chart 11. — If the engine is a no start, GO directly to Chart 3. — If the engine runs rough at idle, GO directly to Chart 1.

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Check Fuel Cap	Verify the fuel filler cap is correctly tightened or the capless fuel tank filler pipe is correctly sealed. REFER to the Workshop Manual Section 413-01, Instrumentation, Message Center, And Warning Chimes, to diagnose the check fuel message.
MIL — Always on when the engine is running (no DTCs present) — Never on (including during indicator prove out)	REFER to the Workshop Manual Section 413-01, Instrumentation, Message Center, And Warning Chimes, Diagnosis And Testing to continue diagnosis.
PTO	GO to Pinpoint Test FB.
Temperature Warning Indicator Or Gauge (applications with CHT sensor only)	For an engine that is overheating, REFER to the Workshop Manual Section 303-03, Engine Cooling to diagnose the engine overheating symptom. Be aware that since a PCM DTC is not present, the PCM is not attempting to activate the indicator. For an engine operating at normal temperature, GO to Pinpoint Test DL.
TCIL — Always on when the engine is running (no DTCs present) — Never on	REFER to the Workshop Manual Section 307-05, Automatic Transmission, External Controls.
Powertrain Malfunction Indicator (Wrench)	REFER to the Workshop Manual Section 413-01, Instrumentation, Message Center, And Warning Chimes, to diagnose the wrench indicator is never/always on or to diagnose the POWERTRAIN MALFUNCTION warning is inoperative.
Additional Testing	GO to Pinpoint Test Z.

Chart 13

— Automatic Transmission (A/T) Shift Concerns: Upshift, Downshift, Engagement

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Transmission	REFER to the Workshop Manual Section 307-01, Automatic Transmission, Diagnosis And Testing to continue diagnosis.
Additional Tests	GO to Pinpoint Test Z.

Chart 14

— Instrumentation: Tachometer Inoperative, Speedometer/Odometer Inoperative, Boost Gauge Indicates Higher Than Normal Boost, Fuel

Gauge Inoperative

SYSTEM/COMPONENT	REFERENCE (Section 5 Pinpoint Test unless noted)
Tachometer Inoperative	REFER to the Workshop Manual Section 413-01, Instrumentation, Message Center, And Warning Chimes, to diagnose the incorrect tachometer indication.

2016 Powertrain Control/Emissions Diagnosis, Gasoline Engines, 3/2015

Source reference 4784

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.