2003 MAZDA MODEL B4000 Owners Manual

Vehicle loading
Before loading a vehicle, familiarize yourself with the following terms:
•Base Curb Weight: Weight of the vehicle including any standard
equipment, fluids, lubricants, etc. It does not include occupants or
aftermarket equipment.
• Payload: Combined maximum allowable weight of cargo, occupants
and optional equipment. The payload equals the gross vehicle weight
rating minus base curb weight.
• GVW (Gross Vehicle Weight): Base curb weight plus payload
weight. The GVW is not a limit or a specification.
• GVWR (Gross Vehicle Weight Rating): Maximum permissible total
weight of the base vehicle, occupants, optional equipment and cargo.
The GVWR is specific to each vehicle and is listed on the Safety
Certification Label on the driver’s door pillar.
• GAWR (Gross Axle Weight Rating): Carrying capacity for each axle
system. The GAWR is specific to each vehicle and is listed on the
Safety Certification Label on the driver’s door pillar.
• GCW (Gross Combined Weight): The combined weight of the
towing vehicle (including occupants and cargo) and the loaded trailer.
• GCWR (Gross Combined Weight Rating): Maximum permissible
combined weight of towing vehicle (including occupants and cargo)
and the loaded trailer.
• Maximum Trailer Weight Rating: Maximum weight of a trailer the
vehicle is permitted to tow. The maximum trailer weight rating is
determined by subtracting the vehicle curb weight for each
engine/transmission combination, any required option weight for trailer
towing and the weight of the driver from the GCWR for the towing
vehicle.
• Maximum Trailer Weight: Maximum weight of a trailer the loaded
vehicle (including occupants and cargo) is permitted to tow. It is
determined by subtracting the weight of the loaded trailer towing
vehicle from the GCWR for the towing vehicle.
• Trailer Weight Range: Specified weight range that the trailer must
fall within that ranges from zero to the maximum trailer weight rating.
NOTE: Remember to figure in the tongue load of your loaded trailer
when figuring the total weight.
Driving
129

WARNING: Do not exceed the GVWR or the GAWR specified on
the certification label, this could affect vehicle handling and
cause an accident.
Do not use replacement tires with lower load carrying capacities
than the originals because they may lower the vehicle’s GVWR
and GAWR limitations. Replacement tires with a higher limit than
the originals do not increase the GVWR and GAWR limitations.
The Safety Certification Label, found on the driver’s door pillar, lists
several important vehicle weight rating limitations. Before adding any
additional equipment, refer to these limitations. If you are adding weight
to the front of your vehicle, (potentially including weight added to the
cab), the weight added should not exceed the front axle reserve capacity
(FARC). Additional frontal weight may be added to the front axle reserve
capacity provided you limit your payload in other ways (i.e. restrict the
number of occupants or amount of cargo carried).
You may add equipment throughout your vehicle if the total weight
added is equal to or less than the total axle reserve capacity (TARC)
weight. You should NEVER exceed the total axle reserve capacity.
Always ensure that the weight of occupants, cargo and equipment being
carried is within the weight limitations that have been established for
your vehicle including both gross vehicle weight and front and rear gross
axle weight rating limits. WARNING: Exceeding any vehicle weight rating limitation
could result in serious damage to the vehicle loss of vehicle
control, vehicle rollover, and/or personal injury.
Calculating the load your vehicle can carry/tow 1. Use the appropriate maximum GCWR chart (in the Trailer Towing
section in this chapter) for your type of engine and rear axle ratio.
2. Weigh your vehicle without cargo. To obtain correct weights, take your vehicle to a shipping company or an inspection station for
trucks.
3. Subtract your loaded weight from the maximum GCWR in the chart. This is the maximum trailer weight your vehicle can tow. It must be
below the maximum trailer weight shown in the chart.
Driving
130

TRAILER TOWING
Your vehicle may tow a class I, II or III trailer provided the maximum
trailer weight is less than or equal to the maximum trailer weight listed
for your engine and rear axle ratio on the following charts.
Your vehicle’s load capacity is designated by weight, not by volume, so
you cannot necessarily use all available space when loading a vehicle.
Towing a trailer places an additional load on your vehicle’s engine,
transmission, axle, brakes, tires and suspension. Inspect these
components carefully after any towing operation.
4x2 w/manual transmission
Engine Maximum GCWR - kg
(lbs.)Maximum
trailer weight -
kg (lbs.)Maximum
frontal area of
trailer - m
2
(ft2)
Regular Cab
2.3L 2,177 (4,800) 744 (1,640) Equal to frontal area of vehicle
3.0L Dual Sport 2,722 (6,000) 1,161 (2,560) 4.64 (50) Cab Plus/Cab Plus 4
3.0L Dual Sport 2,722 (6,000) 1,070 (2,360) 4.64 (50)
4.0L Dual Sport 3,175 (7,000) 1,488 (3,380) 4.64 (50)
For high altitude operation, reduce GCW by 2% per 300 meters (1,000
ft.) elevation.
For definition of terms used in this table see Vehicle Loadingearlier
in this chapter.
To determine maximum trailer weight designed for your particular
vehicle, see Calculating the load earlier in this chapter.
Maximum trailer weight is shown. The combined weight of the
completed towing vehicle (including hitch, passengers and cargo) and
the loaded trailer must not exceed the Gross Combined Weight Rating
(GCWR).
Driving
131

4x4 w/manual transmission
Engine Maximum GCWR - kg
(lbs.)Maximum
trailer weight -
kg (lbs)Maximum
frontal area of
trailer - m
2
(ft2)
Regular Cab
3.0L 2,722 (6,000) 1,070 (2,360) 4.64 (50) Cab Plus/Cab Plus 4
3.0L 2,722 (6,000) 980 (2,160) 4.64 (50)
4.0L 3,175 (7,000) 1,388 (3,060) 4.64 (50)
For high altitude operation, reduce GCW by 2% per 300 meters
(1,000 ft.) of elevation.
For definition of terms used in this table, see Vehicle loadingearlier
in this chapter.
To determine maximum trailer weight designed for your vehicle, see
Calculating the load earlier in this chapter.
Maximum trailer weight is shown. The combined weight of the
completed towing vehicle (including hitch, passengers and cargo) and
the loaded trailer must not exceed the Gross Combined Weight Rating
(GCWR).
4x2 w/automatic transmission
Engine Maximum GCWR - kg
(lbs.)Maximum
trailer weight -
kg (lbs.)Maximum
frontal area of
trailer - m
2
(ft2)
Regular Cab
2.3L 2,495 (5,500) 1,025 (2,260) Equal to frontal area of vehicle
3.0L Dual Sport 3,402 (7,500) 1,823 (4,020) 4.64 (50) Cab Plus/Cab Plus 4
3.0L Dual Sport 3,402 (7,500) 1,733 (3,820) 4.64 (50)
4.0L Dual Sport 4,309 (9,500) 2,604 (5,740) 4.64 (50)
For high altitude operation, reduce GCW by 2% per 300 meters
(1,000 ft.) elevation.
Driving
132

4x2 w/automatic transmission
For definition of terms used in this table see Vehicle Loadingearlier
in this chapter.
To determine maximum trailer weight designed for your particular
vehicle, see Calculating the load earlier in this chapter.
Maximum trailer weight is shown. The combined weight of the
completed towing vehicle (including hitch, passengers and cargo) and
the loaded trailer must not exceed the Gross Combined Weight Rating
(GCWR).
4x4 w/automatic transmission
Engine Maximum GCWR - kg
(lbs.)Maximum
trailer weight -
kg (lbs.)Maximum
frontal area of
trailer - m
2
(ft2)
Regular Cab
3.0L 3,402 (7,500) 1,742 (3,840) 4.64 (50) Cab Plus/Cab Plus 4
3.0L 3,402 (7,500) 1,651 (3,640) 4.64 (50)
4.0L 4,309 (9,500) 2,504 (5,520) 4.64 (50)
For high altitude operation, reduce GCW by 2% per 300 meters (1,000
ft.) of elevation.
For definition of terms used in this table, see Vehicle loadingearlier
in this chapter.
To determine maximum trailer weight designed for your vehicle, see
Calculating the load earlier in this chapter.
Maximum trailer weight is shown. The combined weight of the
completed towing vehicle (including hitch, passengers and cargo) and
the loaded trailer must not exceed the Gross Combined Weight Rating
(GCWR).
WARNING: Do not exceed the GVWR or the GAWR specified on
the certification label.
The certification label is found on the driver’s door latch pillar.
Driving
133

WARNING: Towing trailers beyond the maximum recommended
gross trailer weight exceeds the limit of the vehicle and could
result in engine damage, transmission damage, structural
damage, loss of vehicle control, vehicle rollover and personal
injury.
Preparing to tow
Use the proper equipment for towing a trailer and make sure it is
properly attached to your vehicle. See your dealer or a reliable trailer
dealer if you require assistance.
Hitches
For towing trailers up to 907 kg (2,000 lb), use a weight carrying hitch
and ball which uniformly distributes the trailer tongue loads through the
underbody structure. Use a frame-mounted weight distributing hitch for
trailers over 907 kg (2,000 lb).
Do not install a single or multi-clamp type bumper hitch, or a hitch
which attaches to the axle. Underbody mounted hitches are acceptable if
they are installed properly. Follow the towing instructions of a reputable
rental agency.
Whenever a trailer hitch and hardware are removed, make sure all
mounting holes in the underbody are properly sealed to prevent noxious
gases or water from entering.
Safety chains
Always connect the trailer’s safety chains to the frame or hook retainers
of the vehicle hitch. To connect the trailer’s safety chains, cross the
chains under the trailer tongue and allow slack for turning corners.
If you use a rental trailer, follow the instructions that the rental agency
gives to you.
Do not attach safety chains to the bumper.
Trailer brakes
Electric brakes and manual, automatic or surge-type trailer brakes are
safe if installed properly and adjusted to the manufacturer’s
specifications. The trailer brakes must meet local and Federal
regulations.
Driving
134

WARNING: Do not connect a trailer’s hydraulic brake system
directly to your vehicle’s brake system. Your vehicle may not
have enough braking power and your chances of having a
collision greatly increase.
The braking system of the tow vehicle is rated for operation at the
GVWR not GCWR.
Trailer lamps
Trailer lamps are required on most towed vehicles. Make sure your
trailer lamps conform to local and Federal regulations. See your dealer or
trailer rental agency for proper instructions and equipment for hooking
up trailer lamps.
Using a step bumper
The optional step bumper is equipped with an integral hitch and requires
only a ball with a 19 mm (3/4 inch) shank diameter. The bumper has a
907 kg (2,000 lb.) trailer weight and 91 kg (200 lb.) tongue weight
capability.
The rated capacities (as shown in this guide) for trailer towing with the
factory bumper are only valid when the trailer hitch ball is installed
directly into the ball hole in the bumper. Addition of bracketry to either
lower the ball hitch position or extend the ball hitch rearward will
significantly increase the loads on the bumper and its attachments. This
can result in the failure of the bumper or the bumper attachments. Use
of any type of hitch extensions should be considered abuse.
Trailer tow connector
The trailer tow connector is located
under the rear bumper, on the
driver’s side of the vehicle.
1
2
34
Driving
135

Refer to the following chart for information regarding the
factory-equipped trailer tow connector:
Trailer tow connector
Color Function Comment
1. Dark Green Trailer right-handturn signal Circuit activated when brake
pedal is depressed or when
ignition is on and right-hand
turn signal is applied.
2. Yellow Trailer left-hand turn signal Circuit activated when brake
pedal is depressed or when
ignition is on and left-hand
turn signal is applied.
3. Tan/White Tail lamp Relay controlled circuit activated when the park
lamps/headlamps are on.
4. White Ground Matching vehicle circuit returns to battery’s negative
ground.
Driving while you tow
When towing a trailer:
• Turn off the speed control. The speed control may shut off
automatically when you are towing on long, steep grades.
• Consult your local motor vehicle speed regulations for towing a trailer.
• To eliminate excessive shifting, use a lower gear. This will also assist
in transmission cooling. (For additional information, refer to the
Driving with a 5–speed automatic transmission section in this
chapter.
• Under extreme conditions with large frontal trailers, high outside
temperatures and highway speeds, the coolant gauge may indicate
higher than normal coolant temperatures. If this occurs, reduce speed
until the coolant temperature returns to the normal range. Refer to
Engine coolant temperature gauge in theInstrument cluster
chapter.
• Anticipate stops and brake gradually.
• Do not exceed the GCWR rating or transmission damage may occur.
Servicing after towing
If you tow a trailer for long distances, your vehicle will require more
frequent service intervals. Refer to your service maintenance section for
more information.
Driving
136