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On-Board Diagnostics (OBD-II)
Your vehicle is equipped with an on-boarddiagnostics system (OBD-II) that monitorsthe engine’s emission control system. Thissystem protects the environment byensuring that your vehicle continues tomeet government emission standards. TheOBD-II system also assists your authorizeddealer in properly servicing your vehicle.
When the service engine soonindicator illuminates, the OBD-IIsystem has detected amalfunction. Temporary malfunctions maycause the service engine soon indicator toilluminate.
Examples of temporary malfunctions are:
•the vehicle has run out of fuel—theengine may misfire or run poorly
•poor fuel quality or water in thefuel—the engine may misfire or runpoorly
•the fuel fill inlet may not have beenproperly closed See Refueling (page138).
•driving through deep water—theelectrical system may be wet.
You can correct these temporarymalfunctions by filling the fuel tank withgood quality fuel, properly closing the fuelfill inlet or letting the electrical system dryout. After three driving cycles without theseor any other temporary malfunctionspresent, the service engine soon indicatorshould stay off the next time you start theengine. A driving cycle consists of a coldengine startup followed by mixedcity/highway driving. No additional vehicleservice is required.
If the service engine soon indicator remainson, have your vehicle serviced at the firstavailable opportunity. Although somemalfunctions detected by the OBD-II maynot have symptoms that are apparent,continued driving with the service enginesoon indicator on can result in increasedemissions, lower fuel economy, reducedengine and transmission smoothness, andlead to more costly repairs.
Readiness forInspection/Maintenance (I/M)Testing
Some state/provincial and localgovernments may haveInspection/Maintenance (I/M) programsto inspect the emission control equipmenton your vehicle. Failure to pass thisinspection could prevent you from gettinga vehicle registration.
If the service engine soonindicator is on or the bulb doesnot work, you may need to havethe vehicle serviced. See On-BoardDiagnostics (OBD-II).
Your vehicle may not pass the I/M test ifthe service engine soon indicator is on ornot working properly (bulb is burned out),or if the OBD-II system has determinedthat some of the emission control systemshave not been properly checked. In thiscase, your vehicle is not ready for I/Mtesting.
If the vehicle’s engine or transmission hasjust been serviced, or the battery hasrecently run down or been replaced, theOBD-II system may indicate that thevehicle is not ready for I/M testing. Todetermine if the vehicle is ready for I/Mtesting, turn the ignition key to the onposition for 15 seconds without cranking
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the engine. If the service engine soonindicator blinks eight times, it means thatthe vehicle is not ready for I/M testing; ifthe service engine soon indicator stays onsolid, it means that the vehicle is ready forI/M testing.
The OBD-II system monitors the emissioncontrol system during normal driving. Acomplete check may take several days. Ifthe vehicle is not ready for I/M testing, youmay need to perform the following drivingcycle consisting of mixed city and highwaydriving:
Drive on an expressway or highway for asteady 15 minutes, followed by 20 minutesof stop-and-go driving with at least four30-second idle periods.
Allow the vehicle to sit for at least eighthours without starting the engine. Then,start the engine and complete the abovedriving cycle. The engine must warm up toits normal operating temperature. Oncestarted, do not turn off the engine until theabove driving cycle is complete. If thevehicle is still not ready for I/M testing, youwill have to repeat the above driving cycle.
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AUTOMATIC TRANSMISSION
WARNING
Always set the parking brake fullyand make sure the gearshift islatched in P (Park). Turn the ignitionto the off position and remove the keywhenever you leave your vehicle.
Understanding the Shift Positionsof the 5–Speed AutomaticTransmission (If Equipped)
Putting your vehicle in or out of gear:
1.Fully press down the brake pedal.
2.Move the gearshift lever into thedesired gear.
3.Come to a complete stop.
4.Move the gearshift lever and securelylatch it in P (Park)
P (Park)
This position locks the transmission andprevents the rear wheels from turning.
R (Reverse)
With the gearshift lever in R (Reverse), thevehicle will move backward. Always cometo a complete stop before shifting into andout of R (Reverse).
N (Neutral)
With the gearshift lever in N (Neutral), thevehicle can be started and is free to roll.Hold the brake pedal down while in thisposition.
D (Overdrive) with tow/haul off
D (Overdrive) with tow/haul off is thenormal driving position for the best fueleconomy. The overdrive function allowsautomatic upshifts and downshifts throughgears one through five.
D (Overdrive) with tow/haul on
The tow/haul feature improvestransmission operation when towing atrailer or a heavy load. All transmissiongear ranges are available when usingtow/haul.
To activate tow/haul, press thebutton on the end of thegearshift lever. The TOW HAULindicator light will illuminate in theinstrument cluster.
Tow/haul delays upshifts to reducefrequency of transmission shifting.Tow/haul also provides engine braking inall forward gears when the transmission isin the D (Overdrive) position; this enginebraking will slow the vehicle and assist thedriver in controlling the vehicle whendescending a grade. Depending on drivingconditions and load conditions, the
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transmission may downshift, slow thevehicle and control the vehicle speed whendescending a hill, without the acceleratorpedal being pressed. The amount ofdownshift braking provided will vary basedupon the amount the brake pedal ispressed.
To deactivate the tow/haul feature andreturn to normal driving mode, press thebutton on the end of the gearshift lever.The TOW HAUL light will no longer beilluminated.
When you shut-off and restart the engine,the transmission will automatically returnto normal D (Overdrive) mode (tow/hauloff).
WARNING
Do not use the tow/haul or enginebrake features when driving in icy orslippery conditions as the increasedengine braking can cause the rear wheelsto slide and your vehicle to swing aroundwith the possible loss of vehicle control.
3 (Third)
Transmission starts and operates in thirdgear only
Used for improved traction on slipperyroads. Selecting 3 (Third) provides enginebraking.
2 (Second)
Use 2 (Second) to start-up on slipperyroads or to provide additional enginebraking on downgrades.
1 (First)
•Provides maximum engine braking
•Allows upshifts by moving gearshiftlever
•The transmission will not downshiftinto 1 (First) at high speeds; it willdownshift to a lower gear and thenshift into 1 (First) when the vehiclereaches slower speeds.
Forced downshifts
•Allowed in D (Overdrive) with thetow/haul feature on or off
•Press the accelerator to the floor
•Allows transmission to select anappropriate gear
Understanding the Shift Positionsof a 6–Speed AutomaticTransmission (If Equipped)
Putting your vehicle in or out of gear:
1.Fully press down the brake pedal.
2.Move the gearshift lever into thedesired gear.
3.Come to a complete stop.
4.Move the gearshift lever and securelylatch it in P (Park)
P (Park)
This position locks the transmission andprevents the rear wheels from turning.
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R (Reverse)
With the gearshift lever in R (Reverse), thevehicle will move backward. Always cometo a complete stop before shifting into andout of R (Reverse).
N (Neutral)
With the gearshift lever in N (Neutral), thevehicle can be started and is free to roll.Hold the brake pedal down while in thisposition.
D (Overdrive) with tow/haul off
D (Overdrive) with tow/haul off is thenormal driving position for the best fueleconomy. The overdrive function allowsautomatic upshifts and downshifts throughgears one through six.
D (Overdrive) with tow/haul on
The tow/haul feature improvestransmission operation when towing atrailer or a heavy load. All transmissiongear ranges are available when usingtow/haul.
To activate tow/haul, press thebutton on the end of thegearshift lever. The TOW HAULindicator light will illuminate in theinstrument cluster.
Tow/haul delays upshifts to reducefrequency of transmission shifting.Tow/haul also provides engine braking inall forward gears when the transmission isin the D (Overdrive) position; this enginebraking will slow the vehicle and assist thedriver in controlling the vehicle whendescending a grade. Depending on drivingconditions and load conditions, thetransmission may downshift, slow thevehicle and control the vehicle speed whendescending a hill, without the acceleratorpedal being pressed. The amount ofdownshift braking provided will vary basedupon the amount the brake pedal ispressed.
Tow/haul may be automatically activated(without pressing the tow/haul button).This provides engine braking to assist thevehicles braking system when goingdownhill and repetitive braking is sensed.Once the tow/haul mode has beenautomatically activated it will notautomatically deactivate.
To deactivate the tow/haul feature andreturn to normal driving mode, press thebutton on the end of the gearshift lever.The TOW HAUL light will no longer beilluminated.
Tow/haul will also deactivate when thevehicle is powered down for a few minutes.
WARNING
Do not use the tow/haul or enginebrake features when driving in icy orslippery conditions as the increasedengine braking can cause the rear wheelsto slide and your vehicle to swing aroundwith the possible loss of vehicle control.
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M (Manual) without Overdrive
With the gearshift lever in M (Manual), thedriver can change gears up or down asdesired. This is called SelectShiftAutomatic™ transmission (SST) mode.By moving the gearshift lever from driveposition D (Overdrive) to M (Manual) younow have control of selecting the gear youdesire using buttons on the shift lever.
To return to normal D (Overdrive) position,move the shift lever back from M to D.
The transmission will operate in gears onethrough six.
2 (Second)
Use 2 (Second) to start-up on slipperyroads or to provide additional enginebraking on downgrades.
1 (First)
•Provides maximum engine braking
•Allows upshifts by moving gearshiftlever
•The transmission will not downshiftinto 1 (First) at high speeds; it willdownshift to a lower gear and thenshift into 1 (First) when the vehiclereaches slower speeds.
Forced downshifts
•Allowed in D (Overdrive) with thetow/haul feature on or off
•Press the accelerator to the floor
•Allows transmission to select anappropriate gear
Understanding your SelectShiftAutomatic® transmission (If Equipped)
Your vehicle is equipped with a SelectShiftAutomatic transmission gearshift lever.SelectShift Automatic transmission givesyou the ability to change gears up or down(without a clutch) as desired.
Use the buttons on the shifter to lock orunlock gears and manually select gears.Press the + button to upshift or the –button to downshift.
With the gearshift lever in D (Drive), pressthe – button to activate SelectShift. Theavailable and selected gears will beindicated on the instrument cluster.
All available gears will be displayed withthe current gear indicated. Press the –button again to lock out gears beginningwith the highest gear. Example: press the– button twice to lock out 6th and 5thgears. Only the available gears will bedisplayed and the transmission willautomatically shift between the availablegears. Press the + button to unlock gears.
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By moving the gearshift lever from the D(Drive) position to the M (Manual) positionyou may now manually select the gear youdesire. Only the current gear will bedisplayed. Press the + button or the –button to upshift or downshift. If the –button is pressed at a vehicle speed that
would cause an engine overspeed, therequested gear will flash then disappearand the transmission will remain in thecurrent gear.
Recommended shift speeds
Upshift according to the following chart:
Upshifts when accelerating (recommended for best fuel economy)
Diesel enginesGasoline enginesShift from:
12 mph (19 km/h)15 mph (24 km/h)1 – 2
19 mph (31 km/h)25 mph (40 km/h)2 – 3
26 mph (42 km/h)40 mph (64 km/h)3 – 4
34 mph (55 km/h)45 mph (72 km/h)4 – 5
46 mph (74 km/h)50 mph (80 km/h)5 – 6
In order to prevent the engine from runningat too low an RPM, which may cause it tostall, SelectShift will still automaticallymake some downshifts if it has determinedthat you have not downshifted in time.Although SelectShift will make somedownshifts for you, it will still allow you todownshift at any time as long as theSelectShift determines that the engine willnot be damaged from over-revving.
SelectShift will not automatically upshift,even if the engine is approaching the RPMlimit. It must be shifted manually bypressing the + button.
Note:Engine damage may occur ifexcessive engine revving is held withoutshifting.
Automatic Transmission AdaptiveLearning
This feature is designed to increasedurability and provide consistent shift feelover the life of the vehicle. A new vehicleor transmission may have firm shifts, softshifts or both. This operation is considerednormal and will not affect function ordurability of the transmission. Over time,the adaptive learning process will fullyupdate transmission operation.Additionally, whenever the battery isdisconnected or a new battery installed,the strategy must be relearned.
Brake-Shift Interlock
WARNINGS
Do not drive your vehicle until youverify that the brake lamps areworking.
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WARNINGS
When doing this procedure, you willbe taking the vehicle out of parkwhich means the vehicle can rollfreely. To avoid unwanted vehiclemovement, always fully set the parkingbrake prior to doing this procedure. Usewheel chocks if appropriate.
If the parking brake is fully released,but the brake warning lamp remainsilluminated, the brakes may not beworking properly. See your authorizeddealer.
Your vehicle is equipped with a brake-shiftinterlock feature that prevents thegearshift lever from being moved from P(Park) when the ignition is in the 3 (on)position and the brake pedal is not pressed.
If you cannot move the gearshift lever outof P (Park) position with the ignition in the4 (on) position and the brake pedalpressed, a malfunction may have occurred.It is possible that a fuse has blown or thevehicle’s brake lamps are not operatingproperly. See Fuse Specification Chart(page 223).
If the fuse is not blown and the brakelamps are working properly, the followingprocedure will allow you to move thegearshift lever from P (Park):
1.Apply the parking brake. Turn theignition key to 1 (off), then remove thekey.
2.Move the steering column to the fulldown and full rearward position(toward the driver’s seat).
3.Remove the gearshift lever boot.
4.Place fingers into hole where thegearshift lever boot was removed fromand pull top half of shroud up andforward to separate it from the lowerhalf of the shroud. There is a hinge atthe forward edge of the top shroud.Roll the top half of the shroud upwardon the hinge point to clear the hazardflasher button, then pull straightrearward toward the driver’s seat toremove.
5.Remove the top half of the shroud.
6.Remove the three fasteners under thecolumn that secure the lower shroudhalf to the column.
7.Pull the lock lever into the full unlockedposition and remove the lower shroudcover by pulling the lever handlethrough the slot in the cover.
8.Apply the brake and move the gearshiftlever into N (Neutral).
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