display RAM CHASSIS CAB 2021 Service Manual

STARTING AND OPERATING119
NORMAL STARTING USING ENGINE
START/S TOP B
UTTON
To Turn On The Engine Using The ENGINE
START/STOP Button

1. The transmission must be in PARK.

2. Press and hold the brake pedal while
pushing the ENGINE START/STOP button
once.
3. The system takes over and attempts to start the vehicle. If the vehicle fails to start, the
starter will disengage automatically after
10 seconds.
4. If you wish to stop the cranking of the engine prior to the engine starting, push the
ENGINE START/STOP button again.
NOTE:
Normal starting of either a cold or a warm
engine is obtained without pumping or pressing
the accelerator pedal. To Turn Off The Engine Using ENGINE
START/STOP Button

1. Place the gear selector in PARK, then push
and release the ENGINE START/STOP button.

2. The ignition will return to the OFF mode.
3. If the gear selector is not in PARK, the ENGINE START/STOP button must be held
for two seconds or three short pushes in a
row with the vehicle speed above 5 mph
(8 km/h) before the engine will shut off.
The ignition will remain in the ACC mode
until the gear selector is in PARK and the
button is pushed twice to the OFF mode.

4. If the gear selector is not in PARK and the ENGINE START/STOP button is pushed once
with the vehicle speed above 5 mph (8 km/h),
the instrument cluster will display a “ Vehicle
Not In Park ” message and the engine will
remain running. Never leave a vehicle out of the
PARK position, or it could roll.

NOTE:
If the gear selector is not in PARK, and the
ENGINE START/STOP button is pushed once
with the vehicle speed below 5 mph (8 km/h), the engine will shut off and the ignition will
remain in the ACC position. If vehicle speed
drops below 1.2 mph (1.9 km/h), the vehicle
may AutoPark Ú
page 120.
ENGINE START/STOP Button Functions — With
Driver’s Foot OFF The Brake Pedal (In PARK Or
NEUTRAL Position)
The ENGINE START/STOP button operates
similar to an ignition switch. It has three modes:
OFF, ACC, and RUN. To change the ignition
modes without starting the vehicle and use the
accessories, follow these directions:

1. Start with the ignition in the OFF mode.

2. Push the ENGINE START/STOP button once to place the ignition to the ACC mode.
3. Push the ENGINE START/STOP button a second time to place the ignition to the
RUN mode.
4. Push the ENGINE START/STOP button a third time to return the ignition to the OFF
mode.
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120STARTING AND OPERATING
(Continued)
AUTOPARK — ROTARY SHIFTER AND
E
IGHT SPEED TRANSMISSION ONLY

AutoPark is a supplemental feature to assist in
placing the vehicle in PARK should the situations
on the following pages occur. It is a back up
system and should not be relied upon as the
primary method by which the driver shifts the
vehicle into PARK.

The conditions under which AutoPark will
engage are outlined on the following pages. If the vehicle is not in PARK and the driver turns
off the engine, the vehicle may AutoPark.
AutoPark will engage when all of these
conditions are met:
Vehicle is equipped with a rotary shifter and
an eight speed transmission
Vehicle is not in PARK
Vehicle speed is 1.2 mph (1.9 km/h) or less
Ignition switched from RUN to ACC
NOTE:
For Keyless Enter-N-Go equipped vehicles, the
engine will turn off and the ignition switch will
change to ACC mode. After 30 minutes the igni -
tion switches to OFF automatically, unless the
driver turns the ignition switch OFF. If the vehicle is not in PARK and the driver exits
the vehicle with the engine running, the vehicle
may AutoPark.
AutoPark will engage when all of these
conditions are met:
Vehicle is equipped with a rotary shifter and
an eight speed transmission
Vehicle is not in PARK
Vehicle speed is 1.2 mph (1.9 km/h) or less
Driver’s seat belt is unbuckled
Driver’s door is ajar
Brake pedal is not pressed
The message “ AutoPark Engaged Shift to P then
Shift to Gear ” will display in the instrument
cluster.
NOTE:
In some cases the ParkSense graphic will be
displayed in the instrument cluster, causing the
“ AutoPark Engaged Shift to P then Shift to Gear ”
to not be seen. In these cases, the shifter must
be returned to “P” to select desired gear.
WARNING!

Driver inattention could lead to failure to
place the vehicle in PARK. ALWAYS DO A
VISUAL CHECK that your vehicle is in PARK
by verifying that a solid (not blinking) “P” is
indicated in the instrument cluster display
and near the gear selector. If the "P" indi -
cator is blinking, your vehicle is not in PARK.
As an added precaution, always apply the
parking brake when exiting the vehicle.

AutoPark is a supplemental feature. It is not
designed to replace the need to shift your
vehicle into PARK. It is a back up system
and should not be relied upon as the
primary method by which the driver shifts
the vehicle into PARK.
WARNING! (Continued)

21_DPF_OM_EN_USC_t.book Page 120

STARTING AND OPERATING121
If the driver shifts into PARK while moving, the
vehicle may AutoPark.
AutoPark will engage ONLY when vehicle speed
is 1.2 mph (1.9 km/h) or less.
The message “ Vehicle Speed is Too High to
Shift to P ” will be displayed in the instrument
cluster if vehicle speed is above 1.2 mph
(1.9 km/h).
4WD Low — If Equipped
AutoPark will be disabled when operating the
vehicle in 4WD LOW.
The message “ AutoPark Disabled ” will be
displayed in the instrument cluster. Additional customer warnings will be given
when all of these conditions are met:
Vehicle is not in PARK
Driver’s door is ajar
Vehicle is in 4WD Low range
The message “ AutoPark Not Engaged ” will be
displayed in the instrument cluster. A warning
chime will continue until you shift the vehicle
into PARK or the driver’s door is closed.
ALWAYS DO A VISUAL CHECK
that your vehicle
is in PARK by looking for the “P” in the
instrument cluster display and near the shifter.
As an added precaution, always apply the
parking brake when exiting the vehicle.
If Engine Fails To Start
If the engine fails to start after you have
followed the “Normal Starting” procedure, it
may be flooded. Push the accelerator pedal all
the way to the floor and hold it there while the
engine is cranking. This should clear any excess
fuel in case the engine is flooded. The starter motor will engage automatically, run
for 10 seconds, and then disengage. Once this
occurs, release the accelerator pedal and the
brake pedal, wait 10 to 15 seconds, then repeat
the “Normal Starting” procedure.
WARNING!
If vehicle speed is above 1.2 mph (1.9 km/h),
the transmission will default to NEUTRAL until
the vehicle speed drops below 1.2 mph
(1.9 km/h). A vehicle left in the NEUTRAL
position can roll. As an added precaution,
always apply the parking brake when exiting
the vehicle.
WARNING!
Never pour fuel or other flammable liquid
into the throttle body air inlet opening in
an attempt to start the vehicle. This could
result in flash fire causing serious personal
injury.
Do not attempt to push or tow your vehicle
to get it started. Vehicles equipped with an
automatic transmission cannot be started
this way. Unburned fuel could enter the
catalytic converter and once the engine has
started, ignite and damage the converter
and vehicle.
If the vehicle has a discharged battery,
booster cables may be used to obtain a
start from a booster battery or the battery in
another vehicle. This type of start can be
dangerous if done improperly
Úpage 345.
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STARTING AND OPERATING123
AUTOMATIC TRANSMISSION
Start the engine with the transmission in the
NEUTRAL or PARK position. Apply the brake
before shifting to any driving range.
Tip Start Feature
Do not press the accelerator. Place the ignition
switch briefly to the START position and release
it. The starter motor will continue to run and will
automatically disengage when the engine is
running.
KEYLESS ENTER-N-GO — IGNITION
This feature allows the driver to operate the
ignition switch with the push of a button, as long
as the Remote Start/Keyless Enter-N-Go key
fob is in the passenger compartment.
Normal Starting
Using The ENGINE START/STOP Button

1. The transmission must be in PARK or NEUTRAL.

2. Press and hold the brake pedal while pushing the ENGINE START/STOP button
once. 3. The system takes over and attempts to start
the vehicle. If the vehicle fails to start, the
starter will disengage automatically after
25 seconds.
4. If you wish to stop the cranking of the engine prior to the engine starting, remove
your foot from the brake pedal and push the
ENGINE START/STOP button again.
NOTE:
Normal starting of either a cold or a warm
engine is obtained without pumping or
pressing the accelerator pedal.
Under cold weather conditions, the engine
may not immediately crank if the "Wait to
Start" telltale is illuminated. This is normal
operation. For vehicles equipped with
Keyless Enter-N-Go, the vehicle will automat -
ically crank when the "Wait to Start" time has
elapsed Ú page 126.
To Turn Off The Engine Using ENGINE START/
STOP Button

1. Place the gear selector in PARK, then push and release the ENGINE START/STOP button.

2. The ignition will return to the OFF mode.
3. If the gear selector is not in PARK and the
ENGINE START/STOP button is pushed once,
the instrument cluster will display a “Vehicle
Not In Park” message and the engine will
remain running. Never leave a vehicle out of
the PARK position, or it could roll.

4. If the gear selector is in NEUTRAL, and the vehicle speed below 5 mph (8 km/h),
pushing the ENGINE START/STOP button
once will turn the engine off. The ignition will
remain in the ACC mode.

5. If the vehicle speed is above 5 mph (8 km/h), the ENGINE START/STOP button must be
held for two seconds (or three short pushes
in a row) to turn the engine off. The ignition
will remain in the ACC mode (NOT the OFF
mode) if the engine is turned off when the
transmission is not in PARK.

NOTE:
If the ignition is left in the ACC or ON/RUN
(engine not running) mode and the transmis -
sion is in PARK, the system will automatically
time out after 30 minutes of inactivity and the
ignition return to the OFF mode.
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21_DPF_OM_EN_USC_t.book Page 123

124STARTING AND OPERATING
ENGINE START/STOP Button Functions — With
Driver’s Foot OFF The Brake Pedal (In PARK Or
NEUTRAL Position)

The ENGINE START/STOP button operates similar
to an ignition switch. It has three positions, OFF,
ACC, RUN. To change the ignition switch positions
without starting the vehicle and use the
accessories follow these steps:

1. Start with the ignition in the OFF position.

2. Push the ENGINE START/STOP button once
to change the ignition to the ACC position.
3. Push the ENGINE START/STOP button a second time to change the ignition to the
RUN position.
4. Push the ENGINE START/STOP button a third time to return the ignition to the OFF
position.Keyless Enter-N-Go Starting Procedure —
Engine Manifold Air Temperature
0°F To 66°F (–18°C to 19°C)
NOTE:
The temperature displayed in the instrument
cluster does not necessarily reflect the engine
manifold air temperature Ú page 90. When
engine temperatures fall below 66°F (19°C)
the “Wait To Start” telltale will remain on indi -
cating the intake air heater system is active.
Follow the steps in the “Normal Starting”
procedure except:

1. Pushing the engine start button with the driver’s foot on the brake will move the
ignition from OFF or ACC to RUN, and
will illuminate the "Wait to Start" telltale.
The engine will not immediately crank, this
is normal operation.

2. The “Wait to Start" telltale will remain on for a period of time that varies depending on
the engine temperature.
3. While the "Wait to Start" telltale is on, the instrument cluster will additionally display a
gauge or bar whose initial length represents the full "Wait to Start" time period. Its length
will decrease until it disappears when the
"Wait to Start" time has elapsed.
4. After the engine “Wait to Start” telltale goes off, the engine will automatically crank.
5. After engine start-up, check to see that there is oil pressure.
6. Release the parking brake and drive.CAUTION!
If the “Water in Fuel Indicator Light” remains
on, DO NOT START the engine before you
drain the water from the fuel filters to avoid
engine damage Ú page 375.
CAUTION!

Do not crank engine for more than 25 seconds
at a time or starter motor damage may result.
Turn the ignition switch to the OFF position and
wait at least two minutes for the starter to cool
before repeating start procedure.

21_DPF_OM_EN_USC_t.book Page 124

126STARTING AND OPERATING
STARTING PROCEDURE — ENGINE
M
ANIFOLD AIR TEMPERATURE 0°F TO
66°F (–18°C
TO 19°C)
NOTE:
The temperature displayed in the instrument
cluster does not necessarily reflect the engine
manifold air temperature Ú page 90. When
engine temperatures fall below 66°F (19°C)
the “Wait To Start” telltale will remain on indi -
cating the intake air heater system is active.
Follow the steps in the “Normal Starting”
procedure except:

1. The “Wait to Start” telltale will remain on for a period of time that varies depending
on the engine temperature.

2. While the “Wait to Start” telltale is on, the instrument cluster will additionally display a
gauge or bar whose initial length represents
the full “Wait to Start” time period. Its length
will decrease until it disappears when the
“Wait to Start” time has elapsed. 3. After the “Wait to Start” telltale goes off,
place the ignition switch in the START
position. Do not press the accelerator
during starting.
4. After engine start-up, check that the oil pressure warning light has turned off.
5. Release the parking brake and drive. NOTE:
Engine idle speed will automatically increase
to 1,000 RPM and engage the Variable
Geometry Turbocharger at low coolant
temperatures to improve engine warm-up.

Automatic equipped vehicles with optional
Keyless Enter-N-Go – If the ENGINE START/
STOP button is pushed once while in PARK
with the ignition off and driver’s foot on the
brake pedal, the vehicle will automatically
crank and start after the “Wait to Start” time
has elapsed. If it is desired to abort the start
process before it completes, the driver’s foot
should be fully removed from the brake pedal
prior to pushing the start button again in order
for the ignition to move directly to off.
If the engine stalls, or if the ignition switch is
left ON for more than two minutes after the
“Wait To Start” telltale goes out, reset the
intake air heater by turning the ignition switch
to the OFF position for at least five seconds
and then back ON. Repeat steps 1 through 5 of
“Starting Procedure – Engine Manifold Air
Temperature 0°F To 66°F (–18°C to 19°C).”

CAUTION!
If the “Water in Fuel Indicator Light” remains
on, DO NOT START the engine before you
drain the water from the fuel filters to avoid
engine damage Ú
page 375.
CAUTION!

Do not crank engine for more than 25 seconds
at a time or starter motor damage may result.
Turn the ignition switch to the OFF position and
wait at least two minutes for the starter to cool
before repeating start procedure.

21_DPF_OM_EN_USC_t.book Page 126

STARTING AND OPERATING131
Your vehicle is equipped with an engine
warm-up protection feature that may limit
engine performance after cold starting at low
ambient temperatures. The length of time
engine speed is limited is dependent upon
engine coolant temperature. Engine speed may
be briefly limited to 1,000 RPM after starting
with coolant temperature below freezing
conditions, and may be limited to 1,000 RPM
for up to approximately two minutes under more
severe cold conditions.
NOTE:
If ambient temperatures are low and the
coolant temperature is below 180°F (82°C),
the engine idle speed will slowly increase to
1,000 RPM after two minutes of idle, if the
following conditions are met:
Foot is off brake pedal and throttle pedal.
Automatic transmission is in PARK.
Vehicle speed is 0 mph (0 km/h).
Applying the throttle will cancel fast idle.
Operating the exhaust brake at idle will
greatly improve warm-up rate and will help
keep the engine close to operating tempera -
ture during extended idle.
ENGINE IDLING
Avoid prolonged idling, long periods of idling
may be harmful to your engine because
combustion chamber temperatures can drop
so low that the fuel may not burn completely.
Incomplete combustion allows carbon and
varnish to form on piston rings, engine valves,
and injector nozzles. Also, the unburned fuel
can enter the crankcase, diluting the oil and
causing rapid wear to the engine.

If the engine is allowed to idle or the truck is
driven on low engine speed drive cycles for more
than two hours, the system will automatically
enter an emissions operating mode that will
increase the engine idle speed to 900 RPM
(1,050 RPM for Chassis Cab). While in this mode,
which is designed to help maintain the Diesel
Particulate Filter, the engine idle speed will return
to normal when the brake pedal is applied.
A small change in engine tone or a slight change
in engine performance while accelerating may
also be noticeable at speeds below 20 mph
(32 km/h). This operating mode may last for up
to an hour of idle time, or around 20 minutes of
driving time. Your truck may have been ordered with an
optional voltage monitoring idle up feature. If a
load is placed on the electrical system while the
truck is in PARK, this feature will attempt to
maintain normal system voltage by automatically
increasing engine idle speed. You may notice
several consecutive increases in idle speed, up to
a maximum of 1,450 RPM, as the system will
attempt to utilize the smallest increase in idle
speed necessary to maintain normal system
voltage. The idle speed will return to normal when
either the electrical load is removed, or when the
brake pedal is applied.

NOTE:
For instrument cluster display messages
related to the vehicle's exhaust system
Ú
page 90.
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STARTING AND OPERATING135
Do Not Operate The Engine With Low Oil Pressure
When the engine is at normal operating temperature, the minimum oil pressures required are:
Do Not Operate The Engine With Failed
Parts

All engine failures give some warning before the
parts fail. Be on the alert for changes in
performance, sounds, and visual evidence that the
engine requires service. Some important clues are:

Engine misfiring or vibrating severely.
Sudden loss of power.
Unusual engine noises.
Fuel, oil or coolant leaks.

Sudden change, outside the normal operating
range, in the engine operating temperature.

Excessive smoke.
Oil pressure drop.
DIESEL PARTICULATE FILTER (DPF)
M
ANUAL REGENERATION - IF EQUIPPED
On equipped Chassis Cabs, a manual
regeneration can be enable through the
instrument cluster. The manual regeneration
will allow the DPF to complete a regeneration,
lowering the soot level without having to drive
the vehicle. The vehicle must be in PARK to
access this feature, and the fuel level must be
over 12.5% full. A message displaying the time
left on the regeneration will appear on the
instrument cluster, and the instrument cluster
will display the soot level Ú page 90.
ENGINE BLOCK HEATER — IF EQUIPPED
The engine block heater warms the engine, and
permits quicker starts in cold weather. Connect
the cord to a standard 110-115 Volt AC
electrical outlet with a grounded, three-wire
extension cord.
Gas Engine Only
The engine block heater cord is routed through
the grille by the right front tow hook.
It includes a removable cap that is secured by a
tethered strap. It also has a c-clip that is used
for storage when not in use for the Winter
months. During Winter months, remove the
heater cord wiring assembly from itself on the
c-clip.
Idle 700 to 800 RPM
10 psi (69 kPa)
Full speed and load 30 psi (207 kPa)
CAUTION!
If oil pressure falls to less than normal
readings, shut the engine off immediately.
Failure to do so could result in immediate and
severe engine damage.4

21_DPF_OM_EN_USC_t.book Page 135

STARTING AND OPERATING139
The exhaust brake feature will only function
when the driver toggles it on by pushing the
exhaust brake button until the "Exhaust Brake
Indicator" is illuminated. Normal (Full Strength)
exhaust brake mode is indicated by a yellow
"Exhaust Brake Indicator".

Exhaust Brake Switch

Once the "Exhaust Brake Indicator” is
illuminated and the vehicle is moving faster
than 5 mph (8 km/h); the exhaust brake will
automatically operate when the driver removes
pressure from the accelerator pedal. Exhaust
braking is most effective when the engine RPM
is higher. The automatic transmission will
downshift more aggressively in TOW/HAUL
mode when the exhaust brake is enabled to
increase brake performance. NOTE:
For optimum braking power it is recommended
to use the exhaust brake while in TOW/HAUL
mode.
The exhaust brake feature can also be used to
reduce the engine warm-up time. To use the
exhaust brake as a warm-up device, the vehicle
must be stopped or moving less than 5 mph
(8 km/h), the "Exhaust Brake Indicator" must be
on, and the coolant temperature must be below
180°F (82°C) and ambient temperature below
60°F (16°C).Automatic “Smart” Exhaust Brake
Automatic “Smart” Exhaust Brake technology
delivers smoother, less aggressive exhaust
braking characteristics during downhill
descents. Although it can apply full exhaust
braking force if needed, Automatic “Smart”
Exhaust Brake may not apply obvious braking if
the vehicle speed is not increasing. Automatic
“Smart” Exhaust Brake is intended to maintain
vehicle speed, while Full Exhaust Brake is
intended to reduce vehicle speed.
Automatic “Smart” Exhaust Brake can be
enabled by pushing the exhaust brake button
(on the center stack) again anytime after the
normal Full Exhaust Brake has been turned on.
The “Exhaust Brake Indicator” in the instrument
cluster display will change from Yellow to Green
when Automatic “Smart” Exhaust Brake is
enabled. Pushing the exhaust brake button
again will toggle the exhaust brake mode to off.WARNING!

Do not use the exhaust brake feature when
driving in icy or slippery conditions as the
increased engine braking can cause the rear
wheels to slide and the vehicle to swing around
with the possible loss of vehicle control, which
may cause an accident possibly resulting in
personal injury or death.

CAUTION!

Use of aftermarket exhaust brakes is not
recommended and could lead to engine damage

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STARTING AND OPERATING141
IGNITION PARK INTERLOCK

This vehicle is equipped with an Ignition Park
Interlock which requires the transmission to be in
PARK before the ignition can be turned to the OFF
mode. This helps the driver avoid inadvertently
leaving the vehicle without placing the
transmission in PARK. This system also locks the
transmission in PARK whenever the ignition is in
the OFF mode.

NOTE:
The transmission is NOT locked in PARK when
the ignition is in the ACC mode (even though the
engine will be off). Ensure that the transmission
is in PARK, and the ignition is OFF (not in ACC
mode) before exiting the vehicle.
BRAKE/TRANSMISSION SHIFT
I
NTERLOCK (BTSI) SYSTEM
This vehicle is equipped with a BTSI system that
holds the transmission gear selector in PARK
unless the brakes are applied. For vehicles with
8-speed transmission, to shift the transmission
out of PARK, the engine must be running and
the brake pedal must be pressed. The brake
pedal must also be pressed to shift from
NEUTRAL into DRIVE or REVERSE when the
vehicle is stopped or moving at low speeds.
For vehicles with 6-speed transmission, to shift
the transmission out of PARK, the ignition must
be in the ON/RUN mode (engine running or not)
and the brake pedal must be pressed.
The BTSI will timeout if brake pedal is pressed
for three minutes or longer continuously while in
park. It can be reset by releasing the brake for
more then three seconds, then reapplying the
brake pedal or cycling the ignition.
EIGHT-SPEED AUTOMATIC
T
RANSMISSION — IF EQUIPPED
The transmission is controlled using a rotary
electronic gear selector located on the
instrument panel. The transmission gear range
(PRND) is displayed both above the gear selector and in the instrument cluster. To select
a gear range, simply rotate the gear selector.
You must press the brake pedal to shift the
transmission out of PARK (or NEUTRAL, when
the vehicle is stopped or moving at low speeds).
To shift past multiple gear ranges at once (such
as PARK to DRIVE), simply rotate the gear
selector to the appropriate detent. Select the
DRIVE range for normal driving.
NOTE:
In the event of a mismatch between the gear
selector position and the actual transmission
gear (for example, driver selects PARK while
driving), the position indicator will blink continu
-
ously until the selector is returned to the proper
position, or the requested shift can be
completed.

The electronically-controlled transmission
adapts its shift schedule based on driver inputs,
along with environmental and road conditions.
The transmission electronics are self-calibrating;
therefore, the first few shifts on a new vehicle
may be somewhat abrupt. This is a normal
condition, and precision shifts will develop within
a few hundred miles (kilometers).

CAUTION!

Shift into or out of PARK or REVERSE only after
the vehicle has come to a complete stop.

Do not shift between PARK, REVERSE,
NEUTRAL, or DRIVE when the engine is
above idle speed.
Before shifting into any gear, make sure
your foot is firmly pressing the brake pedal.
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