Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2010MUSTANG BASE, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYMPTOM CHARTS (EXCEPT DIESEL & HYBRID)NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHARTSCHART 10
2010 Ford Mustang Base, 2D Coupe, Automatic
Chart 10
2010 Ford Mustang Base, 2D Coupe, AutomaticSECTION Chart 10
- Poor Fuel Economy
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 tire pressure and size
- vehicle loads (such as trailer towing)
- extended winter warm-up conditions
- high speed driving
- incorrect axle ratio
- road/weather conditions
- aftermarket add-ons
- short run operations
- customer expectations
POOR FUEL ECONOMY SYMPTOM CHART
| SYSTEM/COMPONENT | REFERENCE (article 5 Pinpoint Test unless noted) |
|---|---|
Check the following PIDs:
|
LONGFT1/LONGFT2 value low (-): Continue diagnosis. Concentrate checks in areas that would cause the engine to run rich. LONGFT1/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 appropriate Charging System and carry out the Inspection and Verification 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. |
| Verify the engine operates at normal temperature. | Visual. REFER to the appropriate Engine Cooling, Symptom Chart to diagnose any cooling system concerns that are present. |
| Secondary Ignition System | For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC
. For all others, GO to PINPOINT TEST JB . |
| Fuel System | GO to PINPOINT TEST HC . |
| Exhaust System | GO to PINPOINT TEST HF . |
| Variable Camshaft Timing (VCT) System | GO to PINPOINT TEST HK . |
| Transmission Fluid Level | Visual. |
| Automatic Transmission | REFER to the Diagnosis By Symptom in the appropriate Automatic Transmission/Transaxle to continue diagnosis. |
| Positive Crankcase Ventilation (PCV) System | GO to PINPOINT TEST HG . |
Additional Checks:
|
REFER to the applicable Workshop information article. |
| Additional Testing | GO to PINPOINT TEST Z . |
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.