
Protected ComponentFuse RatingFuse or RelayNumber
Daytime running lamp/headlamp relay.—R12
Powertrain control module relay.—R13
Fuel pump diode.—D1
Air conditioning clutch diode.—D2
Not used.—D3
Not used.—C1
1 Mini fuse.2 J case fuse.
UPS Power Distribution Box 1
Protected ComponentFuse RatingFuse or RelayNumber
Powertrain control module.RelayR1
Daytime running lamps.RelayR2
Starter motor.RelayR3
Blower motor.RelayR4
Horn.RelayR5
Fuel pump.RelayR6
Starter ground.RelayR7
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Protected ComponentFuse RatingFuse or RelayNumber
Trailer tow backup lamp feed.
Daytime running lamps.20A1M2
4–channel anti-lock brake system module(Hydromax).30A1M3
Powertrain control module run/start.20A1M4Fuel pump relay coil.Fuel pump diode.
Brake lamps.10A1M5
Radio capacitors.20A1M6Ignition coils.
Backup lamp relay coil.20A1M7Air conditioning clutch coil.Air conditioning demand switch.
Catalyst monitor sensor.20A1M8Engine heated exhaust gas oxygen sensor#11 and #21.Canister vent valve.Vapor management valve.
Powertrain control module power.20A1M9
Brake shift interlock.5A1M10
Powertrain control module relay keep alivepower.5A1M11
Powertrain control module relay coil.
Parking lamps feed.20A1M12
Not used.DiodeD1
Fuel pump.DiodeD2
Air conditioning clutch.DiodeD3
Not used.—R2-1
Powertrain control module relay feed(power distribution box fuse M6, M7, M8,M9).
30A2J1
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Vehicles driven year-round in non-extremeclimates should use prediluted coolant foroptimum cooling system and engineprotection.
Coolant Change
At specific mileage intervals, as listed inthe scheduled maintenance information,the coolant should be changed. Addprediluted coolant approved to the correctspecification. See Capacities andSpecifications (page 134).
Fail-Safe Cooling
Fail-safe cooling allows you to temporarilydrive your vehicle before any incrementalcomponent damage occurs. The fail-safedistance depends on ambienttemperature, vehicle load and terrain.
How Fail-Safe Cooling Works
If the engine begins to overheat,the coolant temperature gaugemoves toward the red zone:
A warning lamp illuminates anda message may appear in theinformation display.
If the engine reaches a presetover-temperature condition, the engineautomatically switches to alternatingcylinder operation. Each disabled cylinderacts as an air pump and cools the engine.
When this occurs, your vehicle stilloperates, however:
•Engine power is limited.
•The air conditioning system turns off.
Continued operation increases the enginetemperature, causing the engine tocompletely shut down. Your steering andbraking effort increases in this situation.
When the engine temperature cools, youcan re-start the engine. Have your vehiclechecked as soon as possible to minimizeengine damage.
When Fail-Safe Mode Is Activated
WARNING: Fail-safe mode is foruse during emergencies only. Operateyour vehicle in fail-safe mode only aslong as necessary to bring your vehicleto rest in a safe location and seekimmediate repairs. When in fail-safemode, your vehicle will have limitedpower, will not be able to maintainhigh-speed operation, and maycompletely shut down without warning,potentially losing engine power, powersteering assist, and power brake assist,which may increase the possibility of acrash resulting in serious injury.
WARNING: Do not remove thecoolant reservoir cap when the engine ison or the cooling system is hot. Wait 10minutes for the cooling system to cooldown. Cover the coolant reservoir capwith a thick cloth to prevent thepossibility of scalding and slowly removethe cap. Failure to follow this instructioncould result in personal injury.
Your vehicle has limited engine powerwhen in the fail-safe mode, drive yourvehicle with caution. Your vehicle does notmaintain high-speed operation and theengine may operate poorly.
Remember that the engine is capable ofautomatically shutting down to preventengine damage. In this situation:
1.Pull off the road as soon as safelypossible and switch the engine off.
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2.If you are a member of a roadsideassistance program, we recommendthat you contact your roadsideassistance service provider.
3.If this is not possible, wait a shortperiod for the engine to cool.
4.Check the coolant level. If the coolantlevel is at or below the minimum mark,add prediluted coolant immediately.
5.When the engine temperature cools,you can re-start the engine. Have yourvehicle checked as soon as possible tominimize engine damage.
Note:Driving your vehicle without repairincreases the chance of engine damage.
Engine Coolant TemperatureManagement (If Equipped)
WARNING: To reduce the risk ofcrash and injury, be prepared that thevehicle speed may reduce and thevehicle may not be able to acceleratewith full power until the coolanttemperature reduces.
If you tow a trailer with your vehicle, theengine may temporarily reach a highertemperature during severe operatingconditions, for example ascending a longor steep grade in high ambienttemperatures.
At this time, you may notice the coolanttemperature gauge moves toward the redzone and a message may appear in theinformation display.
You may notice a reduction in vehiclespeed caused by reduced engine power inorder to manage the engine coolanttemperature. Your vehicle may enter thismode if certain high-temperature andhigh-load conditions take place. Theamount of speed reduction depends onvehicle loading, grade and ambienttemperature. If this occurs, there is no needto pull off the road, you can continue todrive your vehicle.
The air conditioning may automaticallyturn on and off during severe operatingconditions to protect the engine fromoverheating. When the coolanttemperature decreases to the normaloperating temperature, the air conditioningturns on.
If the coolant temperature gauge movesfully into the red zone, or if the coolanttemperature warning or service enginesoon messages appear in your informationdisplay, do the following:
1.Pull off the road as soon as safelypossible and shift the transmission intopark (P).
2.Leave the engine running until thecoolant temperature gauge needlereturns to the normal position. Afterseveral minutes, if the temperaturedoes not drop, follow the remainingsteps.
3.Switch the engine off and wait for it tocool. Check the coolant level.
4.If the coolant level is at or below theminimum mark, add prediluted coolantimmediately.
5.If the coolant level is normal, restartthe engine and continue.
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•The transmission must relearn itsadaptive strategy. As a result of this,the transmission may shift firmly. Thisoperation is considered normal and willnot affect function or durability of thetransmission. Over time the adaptivelearning process will fully updatetransmission operation to its optimumshift feel.
•The clock and the preset radio stationsmust be reset once the battery isreconnected.
•Your vehicle’s engine is electronicallycontrolled by a computer, some controlconditions are maintained by powerfrom the battery, the engine mustrelearn its idle and fuel trim strategy.
When the battery is disconnected or a newbattery is installed, begin the batteryrelearn process:
1.With the vehicle at a complete stop,set the parking brake.
2.Put the gearshift lever in P (Park), turnoff all accessories and start the engine.
3.Run the engine until it reaches normaloperating temperature.
4.Allow the engine to idle for at least oneminute.
5.Turn the A/C on and allow the engineto idle for at least one minute.
6.Drive the vehicle to complete therelearning process.
•The vehicle may need to be drivento relearn the idle and fuel trimstrategy.
CHANGING THE ENGINE AIR
FILTER
WARNING: To reduce the risk ofvehicle damage and personal burninjuries, do not start your engine with theair cleaner removed and do not removeit while the engine is running.
Change the air filter element at the properinterval. See Scheduled Maintenance(page 145).
When changing the air filter element, useonly the air filter element listed. SeeCapacities and Specifications (page134).
Note:Failure to use the correct air filterelement may result in severe enginedamage. The customer warranty may bevoid for any damage to the engine if thecorrect air filter element is not used.
1.Loosen the latches that secure the airfilter cover in place.
2.Carefully separate the two halves ofthe air filter housing.
3.Remove the air filter element from thehousing.
4.Wipe any dirt or debris from the air filterhousing and cover.
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The traction grades, from highestto lowest are AA, A, B, and C. Thegrades represent the tire’s abilityto stop on wet pavement asmeasured under controlledconditions on specifiedgovernment test surfaces ofasphalt and concrete. A tiremarked C may have poor tractionperformance.
Temperature A B C
WARNING: Thetemperature grade for this tire isestablished for a tire that isproperly inflated and notoverloaded. Excessive speed,underinflation, or excessiveloading, either separately or incombination, can cause heatbuildup and possible tire failure.
The temperature grades are A(the highest), B and C,representing the tire’s resistanceto the generation of heat and itsability to dissipate heat whentested under controlled conditionson a specified indoor laboratorytest wheel. Sustained hightemperature can cause thematerial of the tire to degenerateand reduce tire life, and excessivetemperature can lead to suddentire failure. The grade Ccorresponds to a level ofperformance which all passengercar tires must meet under the
Federal Motor Vehicle SafetyStandard No. 139. Grades B and Arepresent higher levels ofperformance on the laboratorytest wheel than the minimumrequired by law.
Glossary of Tire Terminology
*Tire label: A label showing theoriginal equipment tire sizes,recommended inflation pressureand the maximum weight thevehicle can carry.
*Tire Identification Number: Anumber on the sidewall of eachtire providing information aboutthe tire brand and manufacturingplant, tire size and date ofmanufacture. Also referred to asDOT code.
*Inflation pressure: A measureof the amount of air in a tire.
*Standard load: A class ofP-metric or Metric tires designedto carry a maximum load at setpressure. For example: ForP-metric tires 35 psi (2.4 bar) andfor Metric tires 36 psi (2.5 bar).Increasing the inflation pressurebeyond this pressure will notincrease the tire’s load carryingcapability.
*Extra load: A class of P-metricor Metric tires designed to carry aheavier maximum load at 42 psi(2.9 bar). Increasing the inflationpressure beyond this pressure willnot increase the tire’s loadcarrying capability.
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Stay out of the trajectory (1) asindicated in the illustration.
Inspecting Your Tires andWheel Valve Stems
Periodically inspect the tire treadsfor uneven or excessive wear andremove objects such as stones,nails or glass that may be wedgedin the tread grooves. Check the tireand valve stems for holes, cracks,or cuts that may permit airleakage and repair or replace thetire and replace the valve stem.Inspect the tire sidewalls forcracking, cuts, bruises and othersigns of damage or excessive
wear. If internal damage to the tireis suspected, have the tiredemounted and inspected in caseit needs to be repaired or replaced.For your safety, tires that aredamaged or show signs ofexcessive wear should not be usedbecause they are more likely toblow out or fail.
Improper or inadequate vehiclemaintenance can cause tires towear abnormally. Inspect all yourtires, including the spare,frequently, and replace them ifone or more of the followingconditions exist:
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ENGINE SPECIFICATIONS
6.8L EngineEngine
415 in³ (6,800 cm³)Displacement
1-6-5-10-2-7-3-8-4-9Firing order
Coil on plugIgnition system
0.039 in (1 mm) - 0.043 in (1.1 mm)Spark plug gap
9.2:1Compression ratio
Drivebelt Routing
Engines with Air Conditioning
Engines without Air Conditioning
MOTORCRAFT PARTS
Motorcraft Part numberComponent
FA-1782Air filter element
BH-31-XTBattery (F-53 stripped chassis and F-59step van ramp prep package)
BH-31-XTBattery (F-59 step van)
FL-820-SOil filter
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