9 - CDS 4.8 SV Owner’s Guide
ENGINE COMPUTER RELEARN
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 engine must 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 begin this process:
1. With the vehicle at a complete stop, set the parking brake.
2.
Put the gearshift in P (Park), turn off all accessories and start the engine.
3. Run the engine until it reaches normal operating temperature.
4. Allow the engine to idle for at least one minute.
5. Turn the A/C on and allow the engine to idle for at least one minute.
6. Release the parking brake. With your foot on the brake pedal and with the A/C on,
put the vehicle in D (Drive) and allow the engine to idle for at least one minute.
7. Drive the vehicle to complete the relearning process.
• The vehicle may need to be driven 10 miles (16 km) or more to relearn the idle
and fuel trim strategy along with the ethanol content for flexible fuel vehicles.
• If you do not allow the engine to relearn its idle trim, the idle quality of your vehicle
may be adversely affected until the idle trim is eventually relearned.
•
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.
If the battery has been disconnected or a new battery has been installed, the clock and
radio settings must be reset once the battery is reconnected.
