2023 RAM CHASSIS CAB ignition

368SERVICING AND MAINTENANCE
(Continued)
To minimize the possibility of catalytic converter
damage:
Do not interrupt the ignition when the transmis
-
sion is in gear and the vehicle is in motion.
Do not try to start the vehicle by pushing or
towing the vehicle.
Do not idle the engine with any ignition compo -
nents disconnected or removed, such as when
diagnostic testing, or for prolonged periods
during very rough idle or malfunctioning oper -
ating conditions.
COOLING SYSTEM
Engine Coolant Checks
Check the engine coolant (antifreeze) protection
every 12 months (before the onset of freezing
weather, where applicable). If the engine coolant is
dirty or rusty in appearance, the system should be
drained, flushed and refilled with fresh coolant.
Check the front of the A/C condenser or radiator
for any accumulation of bugs, leaves, etc. If dirty,
clean by gently spraying water from a garden hose
vertically down the face of the A/C condenser or
the back of the radiator core.
Check the engine cooling system hoses for brittle
rubber, cracking, tears, cuts and tightness of the
connection at the coolant recovery bottle and
radiator. Inspect the entire system for leaks.
DO NOT REMOVE THE COOLANT PRESSURE CAP
WHEN THE COOLING SYSTEM IS HOT.
Cooling System — Drain, Flush And Refill
NOTE:Some vehicles require special tools to add coolant
properly. Failure to fill these systems properly could lead to severe internal engine damage. If any
coolant is needed to be added to the system
please contact an authorized dealer.
If the engine coolant (antifreeze) is dirty or
contains visible sediment, have an authorized
dealer clean and flush with Organic Additive
Technology (OAT) coolant (conforming to
MS.90032).
For the proper maintenance intervals
Úpage 344.
Selection Of Coolant
For further information Ú page 419.
NOTE:
Mixing of engine coolant (antifreeze) other than
specified Organic Additive Technology (OAT)
engine coolant, may result in engine damage
and may decrease corrosion protection. OAT
engine coolant is different and should not be
mixed with Hybrid Organic Additive Technology
(HOAT) engine coolant or any “globally compat -
ible” coolant. If a non-OAT engine coolant is
introduced into the cooling system in an emer -
gency, the cooling system will need to be
drained, flushed, and refilled with fresh OAT
coolant (conforming to MS.90032), by an autho -
rized dealer as soon as possible.
Do not use water alone or alcohol-based engine
coolant products. Do not use additional rust
inhibitors or anti-rust products, as they may not
WARNING!
You or others can be badly burned by hot
engine coolant (antifreeze) or steam from your
radiator. If you see or hear steam coming from
under the hood, do not open the hood until the
radiator has had time to cool. Never open a
cooling system pressure cap when the radi -
ator or coolant bottle is hot.
Keep hands, tools, clothing, and jewelry away
from the radiator cooling fan when the hood is
raised. The fan starts automatically and may
start at any time, whether the engine is
running or not.
When working near the radiator cooling fan,
disconnect the fan motor lead or turn the igni -
tion to the OFF position. The fan is tempera -
ture controlled and can start at any time the
ignition is in the ON position.
WARNING!

23_DPF_OM_EN_USC_t.book Page 368

SERVICING AND MAINTENANCE377
FUSES
General Information
The fuses protect electrical systems against
excessive current.
When a device does not work, you must check the
fuse element inside the blade fuse for a break/
melt.
Also, please be aware that using power outlets for
extended periods of time with the engine off may
result in vehicle battery discharge.

Blade Fuses
Power Distribution Center
The Power Distribution Center is located in the
engine compartment near the battery. This center
contains cartridge fuses, micro fuses, relays, and
circuit breakers. A description of each fuse and
component may be stamped on the inside cover,
otherwise the cavity number of each fuse is
stamped on the inside cover that corresponds to
the following chart.
WARNING!
When replacing a blown fuse, always use an
appropriate replacement fuse with the same
amp rating as the original fuse. Never replace
a fuse with another fuse of higher amp rating.
The use of a fuse with a rating other than indi -
cated may result in a dangerous electrical
system overload. If a properly rated fuse
continues to blow, it indicates a problem in the
circuit that must be corrected. Never replace a
blown fuse with metal wires or any other mate -
rial. Do not place a fuse inside a circuit
breaker cavity or vice versa. Failure to use
proper fuses may result in serious personal
injury, fire and/or property damage.
Before replacing a fuse, make sure that the
ignition is off and that all the other services
are switched off and/or disengaged.
If the replaced fuse blows again, contact an
authorized dealer.
If a general protection fuse for safety systems
(air bag system, braking system), power unit
systems (engine system, transmission
system) or steering system blows, contact an
authorized dealer.
1 — Fuse Element
2 — Blade Fuse with a good/functional fuse
element
3 — Blade fuse with a bad/not functional fuse
element (blown fuse)
CAUTION!
When installing the power distribution center
cover, it is important to ensure the cover is
properly positioned and fully latched. Failure
to do so may allow water to get into the power
distribution center and possibly result in an
electrical system failure.
If it is necessary to wash the engine compart -
ment, take care not to directly hit the fuse box
or the windshield wiper motor with water.
8

23_DPF_OM_EN_USC_t.book Page 377

382SERVICING AND MAINTENANCE
F61 –10 Amp RedNH3 Sensor / PM Sensor *
F62 –10 Amp RedA/C Clutch
F63 –20 Amp YellowIgnition Coils / CAPS
F64 –25 Amp ClearFuel Injectors / PCM *
F65 –10 Amp RedRVDMP / MOD BLE *
F66 –10 Amp RedSunroof / USB RR * / RR Mirror/
Passenger Wind SW
F67 –10 Amp RedUCI / TRLR 360 Cam/ Tach *
F68 –10 Amp RedAEB RACAM HTR *
F69 –15 Amp BlueSCR Mod 12 Volt *
F70 –30 Amp GreenFuel Pump Mtr / Fuel Htr RLY
F71 –25 Amp ClearAmp / Act Noise Cnsl
F72 ––Spare
F73 –20 Amp YellowFuel Transfer Pump *
F74 –10 Amp RedBackup Alarm
F75 –10 Amp RedSCR RLY / ATMM *
F76 –10 Amp RedElectronic Stability Control (ESC) *
F77 –10 Amp RedDTCM / TCM / FAD MOD / STOM
F78 –15 Amp BlueECM / PCM / IRCM / AUX Relay
Feed / HRLS
F79 –15 Amp BlueID / Clearance Lt
Cavity Cartridge Fuse Micro FuseDescription
* If Equipped

23_DPF_OM_EN_USC_t.book Page 382

406SERVICING AND MAINTENANCE
Dual Rear Wheels

Tire Rotation

The tires used on dual wheel assemblies should be
matched for wear to prevent overloading one tire in
a set. To check if tires are even, lay a straight edge
across all four tires. The straight edge should touch
all the tires.
NOTE:If your vehicle is equipped with a Tire Pressure
Information System (TPIS):
The Tire Pressure Information System (TPIS)
uses unique sensors in the inner rear wheels to
help identify them from the outer rear wheels,
because of this, the inner and outer wheel loca -
tions can’t be switched.
After a tire rotation is completed, as shown
below, the system can auto learn the locations
of each sensor ID. Auto learning/localization occurs when the vehicle ignition status is
changed from Off to On and speeds of greater
than 5 mph (8 km/h) are obtained and remain
over 5 mph (8 km/h) for at about a 15 minute
period. You may need to drive for 20 minutes to
account slower speeds and stops.
If the tires are rotated incorrectly, the Auto local
-
ization of the TPIS sensors will fail to locate
correctly resulting in incorrect locations for the
pressure values displayed in the Instrument
Cluster.
DEPARTMENT OF TRANSPORTATION
UNIFORM TIRE QUALITY GRADES
The following tire grading categories
were established by the National
Highway Traffic Safety Administration.
The specific grade rating assigned by the
tire's manufacturer in each category is
shown on the sidewall of the tires on
your vehicle.
All passenger vehicle tires must conform
to Federal safety requirements in
addition to these grades.
TREADWEAR
The Treadwear grade is a comparative
rating, based on the wear rate of the tire
when tested under controlled conditions
on a specified government test course.
For example, a tire graded 150 would
wear one and one-half times as well on
the government course as a tire graded
100. The relative performance of tires
depends upon the actual conditions of
their use, however, and may depart
CAUTION!
4500/5500 Dual Rear Tires may only have
one approved direction of rotation. This is to
accommodate the asymmetrical design (tread
pattern) of the On/Off road tire.
When replacing a flat, the spare tire may have
to be remounted on the rim or installed at a
different location to maintain the correct
placement of the tire on the wheel relative to
the tire/wheel position on the vehicle. For
example, if the spare is used to replace an
outer rear tire it will have to be remounted on
the rim so that the wheel is dished inward.
That way the tread design of asymmetrical
tires will maintain proper position.

23_DPF_OM_EN_USC_t.book Page 406

TECHNICAL SPECIFICATIONS415
FUEL SYSTEM CAUTIONSNOTE:Intentional tampering with the emissions control
system can result in civil penalties being assessed
against you.
FUEL REQUIREMENTS – DIESEL ENGINE
Use good quality diesel fuel from a reputable
supplier in your vehicle. Federal law requires that
you must fuel this vehicle with Ultra Low Sulfur
Highway Diesel fuel (15 ppm Sulfur maximum) and
prohibits the use of Low Sulfur Highway Diesel fuel
(500 ppm Sulfur maximum) to avoid damage to the
emissions control system.
For most year-round service, Number 2 diesel fuel
meeting ASTM (formerly known as the American
Society for Testing and Materials) specification
D-975 Grade S15 will provide good performance. If
the vehicle is exposed to extreme cold (below 20°F
or -7°C), or is required to operate at
colder-than-normal conditions for prolonged
periods, use climatized Number 2 diesel fuel or
dilute the Number 2 diesel fuel with 50% Number
1 diesel fuel. This will provide better protection
from fuel gelling or wax-plugging of the fuel filters. Diesel fuel is seldom completely free of water. To
prevent fuel system trouble, drain the
accumulated water from the fuel/water separator
using the fuel/water separator drain provided on
both fuel filters. If you buy good quality fuel and
follow the cold weather advice above, fuel
conditioners should not be required in your vehicle.
If available in your area, a high cetane “premium”
diesel fuel may offer improved cold-starting and
warm-up performance.
CAUTION!
Follow these guidelines to maintain your
vehicle’s performance:
The use of leaded gasoline is prohibited by
Federal law. Using leaded gasoline can impair
engine performance and damage the emis
-
sions control system.
An out-of-tune engine or certain fuel or ignition
malfunctions can cause the catalytic
converter to overheat. If you notice a pungent
burning odor or some light smoke, your engine
may be out of tune or malfunctioning and may
require immediate service. Contact an autho -
rized dealer for service assistance.
The use of fuel additives, which are now being
sold as octane enhancers, is not recom -
mended. Most of these products contain high
concentrations of methanol. Fuel system
damage or vehicle performance problems
resulting from the use of such fuels or addi -
tives is not the responsibility of the manufac-
turer and may void or not be covered under
the New Vehicle Limited Warranty.
WARNING!
Do not use alcohol or gasoline as a fuel blending
agent. They can be unstable under certain
conditions and hazardous or explosive when
mixed with diesel fuel.
CAUTION!
If the Water in Fuel Indicator Light remains on,
DO NOT START engine before you drain the water
from the fuel filter(s) to avoid engine damage
Ú page 360.
9

23_DPF_OM_EN_USC_t.book Page 415

432 HomeLink® (Garage Door Opener)
.................. 47Hood Prop........................................................ 77Hood Release.................................................. 77Hub Caps....................................................... 332
I
Idle-Up Feature.............................................. 124Ignition............................................................ 18Switch......................................................... 18Inside Rearview Mirror............................ 39, 326Instrument Cluster........ 83, 84, 85, 86, 87, 89Descriptions.............................................. 110Display........................................................ 89Engine Oil Reset.......................................... 92Instrument Panel Lens Cleaning.................... 410Integrated Trailer Brake Control.................... 188Interior Appearance Care............................... 409Interior Lights.................................................. 55Intermittent Wipers (Delay Wipers).................. 57Intervention Regeneration Strategy........ 98, 364Inverter Outlet (115V)...................................... 72
J
Jack Location................................................ 329Jack Operation.............................................. 329Jacking And Tire Changing............................ 329Jacking And Tire Changing
b
...................... 329Jump Starting............................................... 333
K
Key Fob Panic Alarm
................................................. 16Programming Additional Key Fobs............... 17Key Fob Battery Service
(Remote Keyless Entry).................................... 16
Key Fob Programming (Remote Keyless Entry).. 17
Keyless Enter 'n Go™.................... 25, 115, 117Passive Entry............................................... 25Keys................................................................. 15
L
Lane Change And Turn Signals........................ 54Lane Change Assist......................................... 54LaneSense.................................................... 163Latches......................................................... 324Hood............................................................ 77
Lead Free Gasoline....................................... 413Leaks, Fluid................................................... 324Life Of Tires................................................... 399Light Bulbs........................................... 324, 384LIghtsElectrinic Power Steering Pump................ 105Oil Temperature........................................ 104Lights............................................................ 324Air Bag.................................... 103, 297, 322Automatic High Beam..................................52Brake Assist Warning................................ 274Brake Warning.......................................... 103Bulb Replacement.................................... 384Cab Top Clearance................................... 388Cargo...........................................................54Center Mounted Stop............................... 388Courtesy/Reading........................................55Cruise....................................................... 110Daytime Running.........................................52
Electronic Stability Program (ESP) Indicator.... 104
Exterior.............................................. 51, 324Fog............................................................ 387Four Wheel Drive Indicator....................... 147

23_DPF_OM_EN_USC_t.book Page 432