2018 Mustang Owner's Manual

Maintenance

Because your vehicle’s engine is electronically controlled by a computer, some control conditions are maintained by power from the battery. When the battery is disconnected or a new battery is installed, the enginemust relearn its idle and fuel trim strategy for optimum driveability and performance. Flexible fuel vehicles (FFV) must also relearn the ethanol content of the fuel for optimum driveability and performance. To restore the settings, do the following: 1. Apply the parking brake. 2. Shift into park (P) or neutral (N). 3. Switch off all accessories. 4. Press the brake pedal and start your vehicle. 5. Run the engine until it reaches normal operating temperature. While the engine is warming up, complete the following: Reset the clock. Reset the power windows bounce-back feature. See Windows andMirrors (page 77). Reset the radio station presets. See Audio System (page 302). 6. Allow the engine to idle for at least one minute. 7. Drive the vehicle at least 10mi (16 km) to completely relearn the idle trim and fuel trim strategy. Note: If you do not allow the engine to relearn the idle and fuel trim strategy, the idle quality of your vehiclemay be adversely affected until the engine computer eventually relearns the idle trim and fuel trim strategy. Note: For flexible fuel vehicles, if you are operating on E85, you may experience poor starts or an inability to start the engine and driveability problems until the fuel trim and ethanol content have been relearned.

Make sure that you dispose of old batteries in an environmentally friendly way. Seek advice from your local authority about recycling old batteries. If storing your vehicle for more than 30 days without recharging the battery, we recommend that you disconnect the battery cables to maintain battery charge for quick starting. Battery Management System (If Equipped) Thebatterymanagement systemmonitors battery conditions and takes actions to extend battery life. If excessive battery drain is detected, the system temporarily disables some electrical systems to protect the battery. Systems included are: • Heated rear window. • Heated seats. • Climate control. • Heated steering wheel. • Audio unit. • Navigation system. A message may appear in the information displays to alert you that battery protection actions are active. These messages are only for notification that an action is taking place, and not intended to indicate an electrical problem or that the battery requires replacement. After battery replacement, or in some cases after charging the battery with an external charger, the batterymanagement systemrequires eight hours of vehicle sleep time to relearn the battery state of charge. During this time your vehicle must remain fully locked with the ignition switched off. Note: Prior to relearning the battery state of charge, the battery management system may temporarily disable some electrical systems.

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Mustang(CZG)Canada/UnitedStatesofAmerica,VehiclesBuiltFrom:07-08-2017, JR3J 19A321AAenUSA,Editiondate:201707,FirstPrinting