Freightliner Argosy Driver's Manual

ARGOSY

®

STI-385-2
A24-00879-000

Driver’s Manual

Foreword

Introduction

This manual provides information needed to operate
and understand the vehicle and its components.
More detailed information is contained in the Owner’s
Warranty Information for North America booklet, and
in the vehicle’s workshop and maintenance manuals.

Custom-built Freightliner vehicles are equipped with
various chassis and cab components. Not all of the
information contained in this manual applies to every
vehicle. For details about components in your ve­hicle, refer to the chassis specification pages in­cluded in all new vehicles and to the component in­formation label, located inside the vehicle.

For your reference, keep this manual in the vehicle
at all times.

IMPORTANT: Descriptions and specifications in
this manual were in effect at the time of printing.
Freightliner Trucks reserves the right to discon­tinue models and to change specifications or
design at any time without notice and without
incurring obligation. Descriptions and specifica­tions contained in this publication provide no
warranty, expressed or implied, and are subject
to revisions and editions without notice.

if an air bag is installed, or if the vehicle features a
collision avoidance system, etc.).

Customer Assistance Center

Having trouble finding service? Call the Customer
Assistance Center at 1-800-385-4357 or 1-800-FTL­HELP. Call night or day, weekdays or weekends, for
dealer referral, vehicle information, breakdown coor­dination, or Fleetpack assistance. Our people are
knowledgeable, professional, and committed to fol­lowing through to help you keep your truck moving.

Environmental Concerns and
Recommendations

Whenever you see instructions in this manual to dis­card materials, you should first attempt to reclaim
and recycle them. To preserve our environment, fol­low appropriate environmental rules and regulations
when disposing of materials.

Event Data Recorder

This vehicle is equipped with one or more devices
that record specific vehicle data. The type and
amount of data recorded varies depending on how
the vehicle is equipped (such as the brand of engine,

© 2007–2015 Daimler Trucks North America LLC. All rights reserved. Daimler Trucks North America LLC is a Daimler
company.

No part of this publication, in whole or part, may be translated, reproduced, stored in a retrieval system, or transmitted
in any form by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written per­mission of Daimler Trucks North America LLC. For additional information, please contact Daimler Trucks North
America LLC, Service Systems and Documentation, P.O. Box 3849, Portland OR 97208–3849 U.S.A. or refer to

www.Daimler-TrucksNorthAmerica.comand www.FreightlinerTrucks.com.

Part Number A24-00879-000

STI-385-2 (11/14)

Printed in U.S.A.

Contents

Chapter Page

Introduction, Environmental Concerns and Recommendations,
Event Data Recorder, Customer Assistance Center

1 Vehicle Identification ...................................................... 1.1

2 Vehicle Access .......................................................... 2.1

3 Electrical System ........................................................ 3.1

4 Instruments ............................................................. 4.1

5 Driver Controls .......................................................... 5.1

6 Climate Control .......................................................... 6.1

7 Seats and Restraints ..................................................... 7.1

8 Cab and Sleeper Features ................................................. 8.1

9 Engine Starting, Operation, and Shutdown .................................... 9.1

10 Optional Engine Systems ................................................. 10.1

11 Emissions Reduction Components ......................................... 11.1

12 Brake System .......................................................... 12.1

13 Steering System ........................................................ 13.1

14 Manual Transmissions and Clutch .......................................... 14.1

15 Automated Transmissions ................................................ 15.1

16 Drive Axle Feature Operation ............................................. 16.1

17 Fifth Wheels ........................................................... 17.1

18 Trailer Couplings ........................................................ 18.1

19 Headlight Aiming ........................................................ 19.1

20 Cab Appearance ........................................................ 20.1

21 In an Emergency ....................................................... 21.1

22 Pre- and Post-Trip Checklists ............................................. 22.1

23 Pre- and Post-Trip Inspections and Maintenance .............................. 23.1

Index .................................................................. I.1

....................... Foreword

1

Vehicle Identification

Component Information Label ....................................................... 1.1

Vehicle Identification

Component Information Label

The component information label lists the vehicle
model, identification number, and major component
models. It also lists the major assemblies and instal­lations shown on the chassis specification sheet. The
component information label is typically attached to
the passenger-side dash. An illustration of the label
is shown in

Fig. 1.1.

02/20/2012 f080176

Fig. 1.1, Component Information Label

1.1

2

Vehicle Access

Door Locks and Handles ........................................................... 2.1

Cab Access, Fixed Steps ........................................................... 2.1

Cab Access, Mobile Stairs .......................................................... 2.4

Back-of-Cab Access ............................................................... 2.7

Opening the Grille ................................................................ 2.8

Cab Tilt System .................................................................. 2.9

Vehicle Access

Door Locks and Handles

One common key operates the ignition switch and all
of the door locks.

IMPORTANT: Each key is numbered. Record
the number so a duplicate key can be made, if
needed.

To unlock the right-hand door from outside the cab,
insert the key in the lock and turn it one-quarter turn
counterclockwise. Turn the key to the original posi­tion to remove it. See

3

Fig. 2.1.

4

2

nal position to remove it. Pull out on the paddle
handle to open the door.

NOTE: The cab door locks can be operated
when the doors are open.

To lock a door from outside the cab, insert the key in
the lock and turn it opposite the unlocking direction
(counterclockwise for the left-hand door, clockwise
for the right-hand door). See

To lock a door from inside the cab, push the lock
knob down or press the automatic lock button on the
door armrest, depending on what the vehicle is
equipped with. See
inside, pull the lock knob up or press the unlock but­ton on the door armrest, depending on what the ve­hicle is equipped with.

Fig. 2.2. To unlock the door from

Fig. 2.2.

Cab Access, Fixed Steps

WARNING

Wet or dirty shoes greatly increase the chance of
slipping or falling. If your shoes are wet or dirty,
be especially careful when entering or exiting the
vehicle.

Always maintain three-point contact with the ve­hicle when entering or exiting the cab. Three­point contact means both feet and one hand, or
both hands and one foot.

Do not jump from the vehicle.

The grab handles, access steps, and steering wheel
are all part of the cab access system. Use these
"helping hands" when getting into or out of the cab to
increase your security and comfort.

1

05/03/2012 f720751

1. Exterior Deck

2. Door Handle

3. Forward Grab Handle

Fig. 2.1, Door Exterior (right side shown)

To unlock the left-hand door from outside the cab,
insert the key in the lock and turn it one-quarter turn
clockwise. Turn the key counterclockwise to the origi-

2.1

4. Mobile Stairs Override
Button

Left Side Entry

1.

Open the left-hand door and place anything that
you are carrying in the cab.

2.

Grasp the aft grab handle with your right hand
and the forward grab handle with your left hand.

Fig. 2.3.

See

3.

Place your right foot on the bottom step and pull
yourself up.

4.

Place your left foot on the middle step, reaching
higher on both grab handles.

Vehicle Access

23

04/16/2012 f720747

1. Door Pocket

2. Lock Knob

3. Door Handle

Fig. 2.2, Door Interior

4

1

4. Upper Door Grab
Handle

4

12

04/27/2012 f720748

1. Upper Door Grab

2. Door Pocket

3. Exterior Deck

4. A-Pillar Grab Handle

Fig. 2.3, Fixed Steps and Grab Handles, Left Side (RHD

7.

Step into the cab with your right foot first.

Handle

3

7

8

9

5. Forward Grab Handle
6 Aft Grab Handle

7. Top Step

8. Middle Step

9. Bottom Step

shown)

5

6

5.

Place your right foot on the top step and pull
yourself up.

NOTE: The left side of the cab is equipped with
an A-pillar grab handle or the steering wheel,
depending on whether the vehicle is left-hand
drive (LHD) or right-hand drive (RHD).

6.

Move your right hand to the forward grab handle
and your left hand to the steering wheel or
A-pillar grab handle, then place your left foot on
the deck.

Left Side Exit

IMPORTANT: Do not attempt to exit the cab
while carrying any items in your hands.

1.

If you take items with you, place them in an ac­cessible location on the seat or cab floor. Make
sure they will not get in your way as you exit.

WARNING

Always face in when exiting the cab. Do not at­tempt to exit with your back to the cab, as you

2.2

Vehicle Access

would going down a flight of stairs. It is easier to
slip or lose your balance. If you slip when exiting
in this way, there is a greater likelihood of per­sonal injury.

NOTE: The left side of the cab is equipped with
an A-pillar grab handle or the steering wheel,
depending on whether the vehicle is LHD or
RHD.

2.

Grasp the steering wheel or A-pillar grab handle
with your left hand, place your right hand on the
forward sidewall grab handle, and place both feet
on the deck, facing into the cab.

3.

Grasp the forward grab handle with your left
hand and move your right hand to the aft grab
handle.

4.

Move your right foot to the top step.

5.

Move your left foot to the middle step and lower
your hands on both grab handles.

6.

Move your right foot to the bottom step.

7.

Step to the ground with your left foot first.

Right Side Entry

1.

Open the right-hand door and place anything that
you are carrying in the cab.

2.

Grasp the aft sidewall grab handle with your left
hand and the forward grab handle with your right
hand. See

3.

Place your left foot on the bottom step and pull
yourself up.

4.

Place your right foot on the middle step, reaching
higher on both grab handles.

5.

Place your left foot on the top step and pull your­self up.

NOTE: The right side of the cab is equipped
with an A-pillar grab handle or the steering
wheel, depending on whether the vehicle is LHD
or RHD.

6.

Move your left hand to the forward grab handle
and your right hand to the steering wheel or
A-pillar grab handle, then place your right foot on
the deck.

7.

Step into the cab with your left foot first.

Fig. 2.4.

7

9

8

6

5

4

3

2
1

05/04/2012 f720749

1. Bottom Step

2. Middle Step

3. Top Step

4. Exterior Deck

5. Door Pocket

Fig. 2.4, Fixed Steps and Grab Handles, Right Side

(RHD shown)

6 Upper Door Grab

Handle

7. Steering Wheel

8. Forward Grab Handle

9. Aft Grab Handle

Right Side Exit

IMPORTANT: Do not attempt to exit the cab
while carrying any items in your hands.

1.

If you take items with you, place them in an ac­cessible location on the seat or cab floor. Make
sure they will not get in your way as you exit.

WARNING

Always face in when exiting the cab. Do not at­tempt to exit with your back to the cab, as you
would going down a flight of stairs. It is easier to
slip or lose your balance. If you slip when exiting

2.3

Vehicle Access

in this way, there is a greater likelihood of per­sonal injury.

NOTE: The right side of the cab is equipped
with an A-pillar grab handle or the steering
wheel, depending on whether the vehicle is LHD
or RHD.

2.

Grasp the steering wheel or A-pillar grab handle
with your right hand, place your left hand on the
forward sidewall grab handle, and place both feet
on the deck, facing into the cab.

3.

Grasp the forward grab handle with your right
hand and move your left hand to the aft grab
handle.

4.

Move your left foot to the top step.

5.

Move your right foot to the middle step and lower
your hands on both grab handles.

6.

Move your left foot to the bottom step.

7.

Step to the ground with your right foot first.

Cab Access, Mobile Stairs

WARNING

•

vehicle is in motion (stairs automatically stow if
the vehicle begins to move)

•

sensors detect weight on the stairs

•

cab is tilted

•

an obstacle is encountered in the stair travel
path

•

the disable button is pressed

To prevent deployment of the stairs from outside the
vehicle, press the button on the side of the cab, di­rectly above the stairs, before opening the door. See

Fig. 2.1.

To prevent deployment of the stairs from inside the
cab, press the dash rocker switch labeled RH STEP
or LH STEP while opening the cab door. See

Fig. 2.5.

2

1

Wet or dirty shoes greatly increase the chance of
slipping or falling. If your shoes are wet or dirty,
be especially careful when entering or exiting the
vehicle.

Always maintain three-point contact with the ve­hicle when entering or exiting the cab. Three­point contact means both feet and one hand, or
both hands and one foot.

Do not jump from the vehicle.

The grab handles, access steps, and steering wheel
are all part of the cab access system. Use these
"helping hands" when getting into or out of the cab.
They will increase your security and comfort.

The mobile stairs will deploy when the cab door is
opened. As the stairs deploy, an audible alert sounds
outside the vehicle. If anything prevents deployment
of the stairs, a buzzer will sound and an indicator will
illuminate on the dash.

The cab stairs will not operate under the following
conditions:

•

parking brake is not set

f61118204/24/2012

1. Right-Hand Stairs
Switch

Fig. 2.5, Mobile Stairs Deployment Switches

2. Left-Hand Stairs
Switch

NOTE: Pressing the disable button or switch will
disable the stairs for one cycle of opening and
closing the door. You must press the disable
button each time you want to prevent deploy­ment of the stairs.

Left Side Entry

1.

Open the left-hand door and place anything that
you are carrying in the cab.

2.

Grasp the aft grab handle (Fig. 2.6) with your
right hand and grab the forward grab handle with
your left hand, reaching up as far as is
comfortable.

3.

Place your right foot on the bottom step and pull
yourself up.

2.4

Vehicle Access

7

6

5

4

3

2

1

08/10/98

1. Bottom Step

2. Middle Step

3. Top Step

4. Top Deck

Fig. 2.6, Mobile Stairs, Left-Hand Side

4.

Place your left foot on the middle step and pull
yourself up.

5.

Move your left hand to the forward grab handle,
then place your left foot on the top step.

5. Aft Grab Handle

6. Forward Grab Handle

7. Steering Wheel

f720309

NOTE: The left side of the cab is equipped with
an A-pillar grab handle or the steering wheel,
depending on whether the vehicle is LHD or
RHD.

6.

Pull yourself up and place your right foot on the
top deck and move your left hand to the A-pillar
grab handle or steering wheel.

7.

Move your right hand to the steering wheel or
A-pillar grab handle.

8.

With both hands gripping the steering wheel or
A-pillar grab handle, move your right foot into the
cab.

Left Side Exit

IMPORTANT: Do not attempt to exit the cab
while carrying any items in your hands.

NOTE: The left side of the cab is equipped with
an A-pillar grab handle or the steering wheel,
depending on whether the vehicle is LHD or
RHD.

1.

Grasp the steering wheel or A-pillar grab handle
with both hands, and stand on the deck at the
top of the stairs facing into the cab.

2.

With your right hand, grasp the forward grab
handle.

3.

Move your right foot to the top step.

4.

Move your left hand to the forward grab handle
and move your left foot to the middle step.

5.

Move your right hand to the aft grab handle and
move your right foot to the bottom step.

6.

Step to the ground with your left foot.

Right Side Entry

1.

Open the right-hand door and place anything that
you are carrying in the cab.

2.

Grasp the aft grab handle with your left hand and
grab the forward grab handle with your right
hand, reaching up as far as you’re comfortable.

Fig. 2.7.

See

3.

Place your left foot on the bottom step and pull
yourself up.

4.

Place your right foot on the middle step and pull
yourself up.

5.

Move your right hand to the forward grab handle,
then place your right foot on the top step.

NOTE: The right side of the cab is equipped
with an A-pillar grab handle or the steering
wheel, depending on whether the vehicle is LHD
or RHD.

6.

Pull yourself up and place your left foot on the
top deck and move your right hand to the A-pillar
grab handle or steering wheel.

7.

Move your left hand to the steering wheel or
A-pillar grab handle.

2.5

Vehicle Access

NOTE: The right side of the cab is equipped
with an A-pillar grab handle or the steering

7

9

8

6

5

wheel, depending on whether the vehicle is LHD
or RHD.

1.

Grasp the steering wheel or A-pillar grab handle
with both hands, and stand on the deck at the
top of the stairs facing into the cab.

2.

With your left hand, grasp the forward grab
handle.

3.

Move your left foot to the top step.

4.

Move your right hand to the forward grab handle
and move your right foot to the middle step.

5.

Move your left hand to the aft grab handle and
move your left foot to the bottom step.

6.

Step to the ground with your right foot.

Mobile Stair Lock-Up Procedures

Access Stairs Will Not Fully Deploy

4

3

2

1

05/16/2012 f720750

1. Bottom Step

2. Middle Step

3. Top Step

4. Exterior Deck

5. Door Pocket

Fig. 2.7, Mobile Stairs and Grab Handles, Right-Hand

8.

With both hands gripping the steering wheel or

Side (RHD shown)

6 Upper Door Grab

Handle

7. Steering Wheel

8. Forward Grab Handle

9. Aft Grab Handle

A-pillar grab handle, move your left foot into the
cab.

Right Side Exit

IMPORTANT: Do not attempt to exit the cab
while carrying any items in your hands.

1.

Close the cab door.

2.

Ensure the parking brake is set.

3.

Inspect for an obstruction in the travel path of the
steps.

4.

Start the engine to increase battery voltage.

5.

If the vehicle is parked at an incline greater than

3.5 degrees in any direction, move it to a level
surface (if conditions permit).

6.

Open the door again. If the steps will not fully
deploy, but will return to a fully stowed position,
press the RH STEP or LH STEP switch while
opening the cab door.

7.

Enter and exit the cab using the access instruc­tions for fixed steps.

Access Stairs Will Not Fully Stow

1.

Open and close the door.

2.

Inspect for an obstruction in the travel path of the
steps.

3.

Start the engine to increase battery voltage.

4.

If the vehicle is parked at an incline greater than

3.5 degrees in any direction, move it to a level
surface (if conditions permit).

2.6

Vehicle Access

5.

Open and close the door again. If the steps still
will not stow, leave the door open and exit the
cab from the opposite side.

6.

Place a hand on the exterior surface of the step,
then apply light pressure to the step while clos­ing the door.

7.

If the step stows, press the yellow disable button
next to the grab handle. This will disable the step
for cycle of opening and closing the door.

8.

If the steps will not fully stow, follow the instruc­tions on the inside of the baggage door to safely
stow the steps.

4

6

5

Back-of-Cab Access

Grab handles are typically located on the backwall of
the cab or sleeper, or on the inside of the cab ex­tender, if equipped. See
also be provided on the exhaust stack. Steps may be
mounted on the fuel tank(s), battery or tool box(es),
or on metal brackets secured to the frame rail. A
deck plate is mounted across the top of the frame
rails. All other areas are not meant to support back­of-cab access.

Follow these rules for back-of-cab access. Failing
to follow these rules could lead to a fall, and pos­sible personal injury.

Never step on any exterior part unless it has a
slip-resistant surface meant for safe stepping. If
the surface is movable, such as a battery box
cover with a slip-resistant surface, be certain it is
firmly secured.

Be careful not to trip on items such as chains or
air lines in the back-of-cab area.

Always follow safety procedures for back-of-cab
access, maintaining three-point contact—both
hands and one foot, or both feet and one hand—
whenever moving around, and always face in to­ward the deck plate when climbing up or down.

Wet or dirty shoes, steps, or grab rails greatly
increase the chance of slipping or falling. If your
shoes or the contact areas are wet or dirty, clean
and dry them as much as possible before ac­cessing the back of cab area, and be especially
careful when climbing or standing on the vehicle.

Fig. 2.8. A grab handle may

WARNING

3

2

1

05/09/2012 f720752

1. Bottom Step

2. Top Step

3. Outboard Grab
Handle

Fig. 2.8, Back-of-Cab Access

Never jump onto, or off of, a vehicle; doing so
creates a very high likelihood of a fall and per­sonal injury.

Wet or dirty shoe soles greatly increase the chance
of slipping or falling. If your soles are wet or dirty, be
especially careful when accessing the back-of-cab
area.

Be careful not to get hands or feet tangled in hoses
or other back-of-cab equipment. Carelessness could
cause a person to trip and fall, with possible injury.

4. Inboard Grab Handle

5. Deck Plates

6. Exhaust-Mounted
Grab Handle

Accessing Back-of-Cab Area

WARNING

External surfaces of the exhaust system remain
hot after the engine has been shut down. When
accessing the back of the cab or sleeper, do not

2.7

touch any part of the exhaust system other than
the exhaust-mounted grab handle, if equipped, or
severe burns could occur.

1.

Facing the center of the deck plate, grasp the
grab handle with both hands. Reach up as far as
is comfortable.

2.

Place one foot on the bottom step and pull your­self up.

3.

Place your other foot on the top step.

4.

Move your lower hand to a higher position on the
grab handle.

5.

Step onto the deck plate.

Exiting the Back-of-Cab Area

1.

Face the center of the vehicle and grasp the
grab handle with both hands.

2.

Place one foot at a time on the top step.

3.

Move your upper hand to a lower position on the
grab handle.

4.

Move one foot to the bottom step.

5.

Step to the ground with your upper foot first.

Vehicle Access

05/23/2011 f602457

Opening the Grille

CAUTION

Step back from the grille when opening it. The
grille can open quickly and could hit a person,
possibly resulting in personal injury.

Opening the grille allows the driver access to the en­gine oil dipstick, the coolant fill cap, and the wind­shield washer reservoir. To open the grille, face the
front of the truck, reach through the latch access
openings on either side of the grille, and release the
two latches. See
both hands and lift. Pull the interior straps down to
pull the grille shut. See

Make sure the grille is shut and latched securely.

NOTE: On some vehicles, the access latches
are located behind the lower corners of the
grille.

Fig. 2.9. Grip the grille firmly with

Fig. 2.10.

Fig. 2.9, Opening the Grille

1

A

1

05/23/2011 f602458

A. Use this strap to close the grille.

1. Grille Latches

Fig. 2.10, Grille (shown fully open)

2.8

Vehicle Access

Cab Tilt System

The hydraulic tilt system is used to tilt and lower the
cab. An electric motor is used to activate the hydrau­lic tilt pump. The tilt pump can also be operated
manually if necessary. A pump handle is located in
the baggage compartment for manually working the
tilt pump.

The hydraulic cab latches open automatically when
the cab is tilted. When the cab is returned to the op­erating position, the latch hooks lock automatically.
An indicator pin on the outboard side of each latch
protrudes when the latch is unlocked, and recedes
when the latch is locked. See

Fig. 2.11.

ing an accident that could result in personal in­jury or property damage.

The hydraulic tilt system is a cab-tilting, not a
cab-holding device. Do not leave the vehicle un­attended unless the cab is fully tilted or resting
against the safety stop. Holding the cab in place
with the hydraulic tilt system may result in per­sonal injury or death and/or property damage.

IMPORTANT: Before tilting or lowering the cab,
read the warning label on the tilt pump and the
tilt instructions label on the exhaust stack.

NOTICE

Before tilting the cab, make sure the vehicle is
parked on level ground, both side-to-side and
fore-to-aft. Tilting the cab while the vehicle is
parked on a slope may damage the cab mounts
and prevent you from returning the cab to the
operating position.

1.

Park the vehicle on a level surface, place the
vehicle in neutral, shut down the engine, and set
the parking brake. Chock the tires.

10/19/94

Fig. 2.11, Indicator Pin

f310441

NOTICE

Do not use either the telescoping tube assembly
or the hydraulic tilt cylinder as a step or hand­hold; you could damage the transmission, tele­scoping tube assembly, or the tilt cylinder.

Tilting the Cab

WARNING

Before tilting the cab, make sure there is ad­equate clearance in front of the vehicle and that
the area is free of people and objects.

Do not tilt the cab with the engine running. Tilt­ing the cab could engage the transmission. If the
engine is running, the vehicle could move, caus-

WARNING

Objects falling in the cab or a door flying open
could damage the vehicle or cause personal in­jury.

2.

Secure all loose articles in the cab and bunk,
then activate the tilt system power switch on the
dash. See

3.

Exit the cab and make sure the doors are fully
latched.

Fig. 2.12.

f61117904/24/2012

Fig. 2.12, Cab Tilt Switch

2.9

NOTICE

Make sure the grille is open before tilting the cab
(vehicles built from June 2011). Leaving the grille
closed while tilting the vehicle will cause damage
to the grille.

IMPORTANT: Vehicles built February 2012 and
later are equipped with a safety mechanism that
prevents the tilt pump from operating when the
grille is not open.

4.

Fully open the grille.

5.

Check the cab travel path for obstructions.

6.

Move the pump control lever to the TILT position.
See

Fig. 2.13.

Vehicle Access

8.

When the cab reaches a 30-degree angle, stop
tilting the cab by letting go of the pump button.
Engage the safety stop on the right tilt cylinder
rod. See
cab from accidentally dropping below this
position.

1

Fig. 2.14. The safety stop prevents the

2

1

05/07/2012 f602470

1. Pump Control Lever

2. Hydraulic Tilt Pump

Fig. 2.13, Cab Tilt Pump

7.

Press and hold the button on the pump to disen­gage the hold-down latches and begin tilting the
cab.

2

3

3. Pump Activation
Button

IMPORTANT: Check the indicator pin on each
cab latch. The latches have disengaged if the
pins are out. See

Fig. 2.11.

DANGER

Make sure the safety stop is engaged on the right
tilt cylinder rod. If the safety stop isn’t engaged,
and the cab should drop, the result could be seri­ous injury or death.

04/15/93

1. Tilt Cylinder Rod 2. Safety Stop

Fig. 2.14, Safety Stop Engaged

9.

To tilt the cab all the way, press and hold the
button on the pump until the cab nears a 45­degree angle (the balance point). See
Once the cab goes beyond 45 degrees, release
the button on the pump and move the tilt pump
lever to the RETURN position in order to slow
cab descent.

f310357a

Fig. 2.15.

IMPORTANT: If the cab stops after it has gone
beyond 45 degrees, don’t force it down with the
tilt pump. The velocity fuses have locked the tilt
cylinders. To unlock them, see Hydraulic
Lockup, below.

Returning the Cab to Operating
Position

DANGER

Stay completely clear of the cab’s travel path at
all times. Once the safety stop has been re­leased, don’t lean over the frame rails, the en­gine, or the transmission for any reason. To do
so could result in serious injury or death.

1.

Move the pump lever to the RETURN position.

2.10

Vehicle Access

A

B

C

03/27/98

A. Upright or Operating Position
B. 45° Tilted Position (balance position)
C. Full-Tilt Position

Fig. 2.15, Cab Tilt Positions

2.

Check the cab travel path for obstructions.

3.

Press and hold the button on the pump to begin

f000896

moving the cab to the operating position.

NOTE: To slow the cab descent, reverse the tilt
pump lever after the cab passes the balance
point.

4.

Allow the cab to lower to the safety stop, then
move the safety stop away from the right tilt cyl­inder rod. See

5.

Press and hold the button on the pump until the

Fig. 2.16.

cab nears a 45-degree angle (the balance point).
See

Fig. 2.15. Once the cab goes beyond 45

degrees, release the button on the pump and
move the tilt pump lever to the TILT position in
order to slow cab descent.

IMPORTANT: If the cab stops after it has gone
beyond 45 degrees, don’t force it down with the
tilt pump. The safety stop is in the locked posi­tion or, the velocity fuses have locked the tilt
cylinders. Release the safety stop or, to unlock
the fuses, see Hydraulic Lockup, below.

6.

Move the pump lever to the RETURN position.

1

3

2

04/15/93

1. Safety Stop

2. Tilt Cylinder Rod

Fig. 2.16, Safety Stop Disengaged

7.

Check the indicator pin on each cab latch. The

3. Tilt Cylinder

f310358a

latches are locked when the pins have moved
back into the piston and cylinder spring assem­bly.

NOTE: Maintain the hydraulic oil level at the oil
fill plug. Add oil only when the cab is in the op­erating position. Use only Freightliner-approved
hydraulic oil. See Group 60 of the Century
Class Trucks Maintenance Manual.

8.

Close the grille.

9.

Switch off the tilt system dash switch.

Hydraulic Lockup

Hydraulic lockup can occur for the following reasons:

•

very cold temperatures

•

use of the wrong hydraulic fluid

•

air in the system

•

sudden cab movement

•

ruptured hydraulic line

•

continued pumping after the cab goes over­center

•

tilt strut in locked position while lowering the
cab

2.11

Any of the above situations will lock the tilt cylinders.
To unlock the cylinders, the cab must be moved in
the opposite direction of travel.

For example, if the cab is moving toward the full-tilt
position when the lockup occurs, move the control
lever to RETURN and work the pump a few strokes
to unlock the cylinders. Move the control lever to the
TILT position and allow the cab to descend to a full­tilt position.

If the cab is moving toward the lowered (operating)
position when the lockup occurs, move the control
lever to TILT and work the pump a few strokes to
unlock the cylinders. Move the control lever to RE­TURN and allow the cab to descend to the operating
position.

Vehicle Access

2.12

3

Electrical System

Circuit Breaker/Relay Panel ......................................................... 3.1

Low Voltage Disconnect Feature ..................................................... 3.1

Cab Load Disconnect Switch ........................................................ 3.1

Battery Access ................................................................... 3.1

Electrical System

Circuit Breaker/Relay Panel

The circuit breaker/relay panel is located in the dash
in front of the passenger seat. To access the com­partment, press the button labeled PRESS and lift
the top dash panel. See

05/07/2012 f545897

A. Press the button and lift the top dash panel

Fig. 3.1, Circuit Breaker/Relay Panel (right-hand drive

Fig. 3.1.

A

shown)

Another sticker is located inside the right-hand door
frame behind the seat, along with the LVD module.

Cab Load Disconnect Switch

WARNING

Turning the cab load disconnect switch (CLDS) to
the off position does not disconnect the connec­tion between the battery and the starter. To work
on the vehicle safely, the negative leads must be
disconnected from the battery.

IMPORTANT: The ignition should be turned off
before turning the CLDS to on or off.

The CLDS is used to avoid excessive draw on the
battery when the vehicle is parked for an extended
period of time by disconnecting (or opening) the con­nection between the battery and the most of the ve­hicle electrical system. See

The CLDS may be mounted:

•

inside the cab on the outboard side of the
driver’s seat;

•

at the battery box;

•

outboard on the left frame rail.

Fig. 3.2.

Low Voltage Disconnect
Feature

The low voltage disconnect (LVD) feature protects
the batteries from excessive discharge by discon­necting certain circuits from battery power supply.
This allows the batteries to maintain acceptable
charge to restart the vehicle. The LVD system turns
off cab and sleeper accessories when voltage drops
to 12.3 volts. An alarm sounds for one minute before
accessories are turned off. If no action is taken within
that minute, the LVD module will shut off power to
predetermined cab and sleeper circuits and illuminate
an LED indicator on the LVD module located inside
the right-hand door frame behind the seat. These
circuits will remain off until the LVD measures 13.0
volts on the electrical system, which can be done by
starting the engine. After the engine is started, the
system will reset.

All vehicles equipped with LVD should have a sticker
on the dash indicating the presence of the system.

06/19/2007 f545071

Fig. 3.2, Cab Load Disconnect Switch

Battery Access

NOTE: On vehicles with vertically-mounted muf­flers, tilt the cab slightly to open the battery box.

3.1

The batteries are typically located aft wall of the cab/
sleeper compartment. To remove the cover from the
battery box, release the latch and lift the cover.

Electrical System

3.2

4

Instruments

Instrumentation Control Units ....................................................... 4.1

Warning and Indicator Lights ........................................................ 4.3

Instruments ...................................................................... 4.7

Driver Message Center ........................................................... 4.10

Overhead Instrument Panel ........................................................ 4.19

Instruments

Instrumentation Control Units

The instrumentation control unit (ICU) provides the
driver with engine and vehicle information. It is com­prised of standard and optional gauges, an audible
warning, a driver message center, and a lightbar con­taining warning and indicator lamps (also known as
telltales). Warning and indicator lamps illuminate in
red (danger), amber (caution), green (status advi­sory), or blue (high-beam headlights activated).

Argosy vehicles are equipped with either an ICU4M
(Fig. 4.1), ICU3 (Fig. 4.2), or ICU2M (Fig. 4.3).

The following headings in this chapter provide addi­tional information and operating instructions for ICU
components:

•

"Warning and Indicator Lights"

•

"Instruments"

•

"Driver Message Center"

8

40

PSI

0

100

OIL

12

200

F

100

300

OIL

3

40

PSI

0

80

TURBO

56

200

150

F

100

250

WATER

12

8

16

VOLTS

4

90

F
10

30

150

PYRO

STOPCHECK

15

RPM

10

X 100

5

0

9

Ignition Sequence

When the ignition is turned on, the ICU runs a self­check. See
is a good way to ensure the ICU is functioning
properly.

IMPORTANT: Do not crank the engine until the
ICU gauge sweep is complete.

NOTE: Air gauges do not complete a sweep of
their dials during the ignition sequence.

When the ignition is turned on, the following actions
should occur:

•

•

7

FASTEN SEATBELTS

0000432 MILES

20

25

30

15

10

Fig. 4.4. Observing the ignition sequence

electronic gauges complete a full sweep of
their dials

some warning and indicator lamps illuminate,
then are extinguished

8

25

OPT OPT OPT OPTOPT OPT OPT OPT

BRAKE

45

35

70

50

30
10

5

MPH

OPT

ABS

ABS

IDLE

!

55

65

90

110

75

130

85

km/h

15

10060

PSI

P

0 160

AIR

11 12

1/2

EF

FUEL

13

F
100

14

200

300

AXLE

16

PSI

0 160

190

F

110

F
100

TRANS

200

AXLE

10060

S

AIR

270

350

300

09/29/2010 f610706b

1. Engine Oil Pressure Gauge

2. Engine Coolant Temperature Gauge

3. Engine Oil Temperature Gauge

4. Battery Voltage Gauge

5. Turbo Boost Air Pressure Gauge

6. Pyrometer

7. Driver Message Center

8. Warning and Indicator Lights

9. Tachometer

10. Speedometer

11. Primary Air Pressure Gauge

12. Secondary Air Pressure Gauge

13. Fuel Level Gauge

14. Transmission Fluid Temperature Gauge

15. Forward Drive Axle Temperature Gauge

16. Rearmost Drive Axle Temperature Gauge

Fig. 4.1, ICU4M Instrument Cluster (typical)

4.1

Instruments

124 5

12

10/26/2006

PSI

150

0

F°

100

F°

100

50

100

OIL

200

250

WATER

225

350

TRANS

CHECK

11

1. Engine Oil Pressure Gauge

2. Lightbar

3. Headlight High-Beam Indicator

4. Driver Message Center

5. Fuel Level Gauge

10

5

3

STOP

20

25

15

30

25

15

5

RPM

0

X100

10

6. Primary Air Pressure Gauge

7. Mode/Reset Switch

8. Secondary Air Pressure Gauge

9. Speedometer

30

35

10

50

ABS

BRAKE

45

70

km/h

MPH

OPT

OPTOPTOPTOPTOPTOPTOPTOPT

1/2

E

F

FUEL

50

100

PSI

150

0

AIR

90

ABS

55

65

110

75

130

85

9

10. Tachometer

11. Tranismission Fluid Temperature
Gauge

12. Coolant Temperature Gauge

50

100

PSI

150

0

AIR

PUSH−
MODE

HOLD−
RESET

f610837b

6

7

8

Fig. 4.2, ICU3 Instrument Cluster

•

audible alert sounds until sufficient air pressure
builds up in the primary and secondary air sys­tems

•

software revision level of the ICU is displayed
on the driver message center, followed by any
active faults

IMPORTANT: If any red or amber warning or
indicator lamps do not illuminate during the ICU
self-check or do not extinguish after the self­check completes, take the action outlined in

Table 4.1, or take the vehicle to an authorized

Daimler Trucks service facility as soon as pos­sible.

NOTE: If active faults are present, take the ve­hicle to an authorized Daimler Trucks service
facility as soon as possible.

If the ICU receives active fault codes, it displays
them one after the other until the parking brake is
released or the ignition is turned off. Once the park­ing brake is completely released, the ICU displays
the odometer. If there are no active faults, the ICU
displays the odometer after the self-check completes.

When the self-check is complete on an ICU4M, the
fasten seat belt screen displays if the engine is off. If
the engine is running, the idle hours screen displays.

Audible Alerts

An audible alert sounds during the ignition sequence
and whenever one of the following conditions exists:

•

Engine oil pressure falls below the minimum
preset value.

•

Coolant temperature rises above the maximum
preset value.

4.2

Instruments

2

1

09/27/95

1. Main Dash Panel

2. Lightbar

3. Driver Message Center

4. Warning and Indicator Lights

Fig. 4.3, ICU2M Instrument Cluster (typical)

IGNITION SWITCH

TURNED TO ON

•

3

4

Door is open or the headlights are on, with the
parking brake off.

Warning and Indicator Lights

The ICU lightbar has three or four rows of warning
and indicator lights with icon symbols, depending on
the ICU. The positions of the lights may vary for the
different ICU’s, but the telltales are standard for all

Table 4.1 for a listing of standard

WARNING

f600991

applications. See
and commonly used warning and indicator lamps.

Warning and indicator lamps illuminate in red (dan­ger), amber (caution), green (status advisory), or
blue (high-beam headlights active).

IMPORTANT: Depending upon local jurisdic­tional emissions guidelines, vehicles may not be
equipped with all of the lamps shown in

Table 4.1.

Engine Protection System

ICU PERFORMS

SELF−TEST

IF NO FAULTS
WERE DETECTED

123456.7

MI

12.3 VOLTS

PARKING BRAKE

RELEASED

123456.7

MI

12.3 VOLTS

01/18/2012 f040420c

Fig. 4.4, ICU Self-Check

•

Air pressure falls below approximately 70 psi

IF FAULT DETECTED

APU 190

PARKING BRAKE

RELEASED

(483 kPa).

•

Parking brake is set with the vehicle moving
faster than two miles per hour.

•

System voltage falls below 12 volts.

When the red STOP engine lamp illuminates,
most engines are programmed to shut down au­tomatically within 30 seconds. The driver must
immediately move the vehicle to a safe location
at the side of the road to prevent causing a haz­ardous situation that could cause bodily injury,
property damage, or severe damage to the en­gine.

Fig. 4.5 for an explanation of the aftertreatment

See
system (ATS) warning indicators, and actions re­quired to avoid further engine protection steps.

The STOP engine lamp illuminates when the engine
protection system is activated in one of two ways. On
some engines, the engine protection system will der­ate the engine, allowing it to run at lower rpm and
slower vehicle speed. Drive the vehicle to a safe lo­cation or to a service facility.

IMPORTANT: Safely bring the vehicle to a stop
on the side of the road and shut down the en­gine as soon as the red light is seen. If the en­gine shuts down while the vehicle is in a haz­ardous location, turn the key to the OFF position
for a few seconds, then restart the engine and
move the vehicle to a safer location.

4.3

STOP

STOP Engine

Common Warning and Indicator Lamps

Lamp Description Color

Indicates a serious fault that requires engine shutdown
immediately. The engine protection system will reduce the
maximum engine torque and speed, and, if the condition
does not improve, will shut down the engine within 30 to 60
seconds.

*

Safely bring the vehicle to a stop on the side of the road
and shut down the engine as soon as the red light is seen.

IMPORTANT: If the engine shuts down while the vehicle
is in a hazardous location, turn the key to the OFF
position for a few seconds, then restart the engine and
move the vehicle to a safer location.

Instruments

BRAKE

CHECK

High Coolant Temperature

Low Air Pressure

Low Engine Oil Pressure

Parking Brake

Low Battery Voltage Indicates that battery voltage is 11.9 volts or less.

Unfastened Seat Belt

CHECK Engine

High Exhaust System
Temperature (HEST)

*

Indicates the coolant temperature is above the maximum
allowable temperature.

Indicates air pressure in the primary or secondary reservoir
is below 70 psi (483 kPa).

Indicates the engine oil pressure is below the minimum
allowable pressure.

Indicates the parking brake is engaged. An audible alert
activates when the vehicle is moving over 2 mph (3 km/h)
with the parking brake set.

Activates with an audible alert when the system detects that
the parking brake is off and the driver seat belt is not
fastened on some vehicles. On other vehicles, this lamp
illuminates for 15 seconds when the ignition is first turned
on.

Indicates an engine condition (low oil pressure, low coolant
level, high coolant temperature, high DPF soot level, or
uncontrolled DPF regeneration) that requires correction.
Correct the condition as soon as possible. If the condition
worsens, the STOP engine lamp will illuminate.

Slow (10-second) flashing indicates a regeneration (regen)
is in progress.

IMPORTANT: When the HEST lamp is illuminated, do

*

not park the vehicle near flammable material.

Solid illumination indicates high exhaust temperatures at the
outlet of the tail pipe when speed is below 5 mph (8 km/h).

Red

Amber

4.4

Instruments

Diesel Particulate Filter
(DPF) Status

Common Warning and Indicator Lamps

Lamp Description Color

Solid illumination indicates a regen is required. Change to a
more challenging duty cycle (such as highway driving ) to
raise exhaust temperatures for at least twenty minutes, or
perform a parked regen.

Blinking indicates that a parked regen is required
immediately.An engine derate and shutdown will occur.

NO

CHARGE

Malfunction Indicator
Lamp (MIL)

Vehicle ABS

Trailer ABS

No Charge

Water in Fuel

Fuel Filter Restriction Indicates the fuel filter is clogged and requires service.

Check Transmission Indicates an undesirable transmission condition.

Indicates an emissions-related fault. See the engine
operation manual for details.

Momentary illumination indicates the vehicle ABS is
engaged.

Solid illumination indicates a problem with the vehicle ABS.
Repair the ABS immediately to ensure full braking
capability.

Momentary illumination indicates the trailer ABS is engaged.
Solid illumination indicates a problem with the trailer ABS.

Repair the ABS immediately to ensure full braking
capability.

Indicates the alternator is not properly powering the
electrical system.

Indicates the fuel may contain water. Drain any water
collected in the fuel/water separators.

Amber

4.5

WHEEL

SPIN

Transmission Overheat Indicates high transmission temperature.

Flashing indicates the ATC system is active, or the ATC
button has been pressed to allow wheel slip.

Wheel Spin

Engine Brake Indicates the engine brake is enabled.

Left-Turn Signal

Solid illumination indicates a problem with the ATC system.
Repair the ATC system immediately to ensure full braking
capability.

Flashing indicates the outside left-turn signal lights are
activated.

Green

Instruments

Common Warning and Indicator Lamps

Lamp Description Color

Right-Turn Signal

Flashing indicates the outside right-turn signal lights are
activated.

High-Beam Headlights Indicates the high-beam headlights are on. Blue

*

See Fig. 4.5 for an explanation of the aftertreatment system (ATS) warning indicators, and actions required to avoid further engine protection steps.

Table 4.1, Common Warning and Indicator Lamps

EXHAUST AFTERTREATMENT SYSTEM INFORMATION

INDICATOR
LAMP(S)

(Solid)

(Flashing) (Flashing)

CHECK

STOP

Level 1 Level 3Level 2 Level 4

Indicator Lamp
Message(s)

Diesel Particulate
Filter Condition

Required Action

For a driver performed Parked Regeneration, vehicle must be equipped with a dash mounted Regeneration Switch.

Filter Regeneration
Recommended.

Filter is reaching
capacity

.

Bring vehicle to
highway speeds to
allow for an
Automatic
Regeneration or
perform a Parked
Regeneration.

Filter
Regeneration
Necessary

Filter is now
reaching maximum

Switch.

capacity

.

To avoid engine
derate, bring vehicle
to highway speeds
to allow for an
Automatic
Regeneration, or
perform a Parked
Regeneration as
soon as possible.

Parked Regeneration
Required − Engine
Derate

Filter has reached
maximum capacity

Vehicle must be
parked, and a Parked
Regeneration must
be performed.
Engine will begin
derate.

.

Service Regeneration Required.
Engine Derate To Idle Only.

Filter has exceeded maximum
capacity.

Vehicle must be parked, and a
Service Regeneration must be
performed. Check engine
operator’s manual for details.
Engine will shut down.

W

ARNING

HEST (High Exhaust
System Temperature)

Flashing

A regeneration is in
progress.

Solid

Exhaust components
and exhaust gas are at
high temperature. When
stationary, keep away
from people and
flammable materials or
vapors.

Green

02/20/2009

Fig. 4.5, ATS Warning Lamps

On other engines, the engine protection system will
shut down the engine. It will first derate the engine,
then shut it down completely 30 to 60 seconds after
the indicator illuminates (depending on the critical
fault type) if the condition does not improve. Bring
the vehicle to a stop on the side of the road before
the engine shuts down.

Some vehicles may have a shutdown-override
switch, which may be used to momentarily override
the shutdown sequence. See

Chapter 10 for detailed

information regarding the shutdown process.

f080156

IMPORTANT: Do not attempt to restart the en­gine while the vehicle is moving. Bring the ve­hicle to a safe stop, then restart the engine.

To restart the engine, turn the ignition switch to OFF
for a few seconds, then turn the ignition switch to ON
and let the gauge sweep complete before starting the
engine. The engine will run for a short period and
shut down again if the condition does not improve.

4.6

Instruments

Instruments

Standard instruments are present on every vehicle.
Optional instruments, typically located on the auxil­iary dash panel or right-hand control panel, are not
found on every vehicle. Instruments are listed here in
alphabetical order to make the information easier to
find.

Air Intake Restriction Gauge

The air intake restriction gauge indicates the vacuum
on the engine side of the air cleaner. On standard
installations, it is mounted on the air cleaner. As an
option for easier viewing, an air intake restriction indi­cator (see
dash panel.

Fig. 4.6) can be mounted on the auxiliary

Vehicles may be equipped with a go/no-go restriction
indicator without graduations (see
a graduated indicator.

Air Intake Maximum Restriction Values (inH2O)

Engine Make

Cummins 25 25
Detroit 20 22
Mercedes-Benz 22 22

Table 4.2, Air Intake Maximum Restriction Values

04/08/2005 f090431

Pre-EPA07 (ADR

80/02) Engines

Fig. 4.7) instead of

EPA07 (ADR 80/

03) Engines

10/10/2001

Fig. 4.6, Air Intake Restriction Indicator

f610568

NOTE: Rain or snow can wet the filter and
cause a temporary high reading.

Air intake restriction vacuum is measured in inches
of water (inH
graduated indicator or a restriction gauge on the
dash, check the gauge with the engine off. If the yel­low signal stays locked in the red zone once the en­gine is shut down, or is at or above the values
shown in
be replaced.

O). For vehicles equipped with a

2

Table 4.2, the air cleaner element needs to

Fig. 4.7, Manual-Reset Air Restriction Indicator, Go/

No-Go

If air restriction exceeds the maximum allowable
value, operate the vehicle for one more day, making
sure not to run the engine over rated rpm. Refer to
the engine operation manual for more information on
rated rpm for your engine.

If air restriction exceeds the maximum value again,
replace the air cleaner. For instructions, refer to

Group 09 of the Century Class Trucks Workshop
Manual.

Application Air Pressure Gauge

An application air pressure gauge registers the air
pressure being used to apply the brakes, and should
be used for reference only. The gauge will not regis­ter air pressure until the foot brake pedal is de­pressed or the trailer hand brake is applied.

4.7

Instruments

Coolant Temperature Gauge

NOTICE

A sudden increase in coolant temperature may
indicate engine or cooling system failure. Bring
the vehicle to a safe stop and investigate the
cause to prevent further damage. Do not operate
the engine until the cause has been determined
and corrected.

During normal engine operation, the coolant tem­perature gauge should read 175 to 195°F (79 to
91°C). If the temperature remains below 160°F
(71°C), inspect the cooling system to determine the
cause.

If coolant temperature rises above the maximum
temperature listed in
lamp will illuminate. If the condition does not im­prove, the STOP engine lamp will also illuminate and
an audible warning will sound. The engine will then
derate or shut down, depending on the type of en­gine protection system installed.

Maximum Coolant Temperature

Engine Make Temperature: °F (°C)

Cummins 225 (107)
Detroit 215 (101)
Mercedes-Benz 221 (105)

Table 4.3, Maximum Coolant Temperature

Table 4.3, the CHECK engine

Drive Axle Oil Temperature Gauges

NOTICE

Under heavy loads, such as when climbing steep
grades, temperatures that exceed the normal oil tem­perature range for a short period are not unusual. If
the temperature returns to normal when the load de­creases, there is no problem.

Engine Oil Pressure Gauge

NOTICE

A sudden decrease or absence of oil pressure
may indicate mechanical failure. Bring the vehicle
to a safe stop and investigate the cause to pre­vent further damage. Do not operate the engine
until the cause has been determined and cor­rected.

The engine oil pressure gauge displays the current
engine oil pressure. If engine oil pressure falls below
the minimum levels shown in
engine lamp will illuminate. If the condition does not
improve, the STOP engine lamp will also illuminate
and an audible warning will sound. The engine will
then derate or shut down, depending on the type of
engine protection system installed.

Minimum Oil Pressure

Engine Model

Cummins 15 (103) 35 (241)
Detroit 14 (97) 55 (350)
Mercedes-Benz 7 (50) 36 (250)

*

Oil pressures are given with the engine at operating temperature. With
the engine cold, oil pressure may be higher. Individual engines may vary
from the listed pressures; observe and record pressures when the engine
is new to create a guide for checking engine condition.

Table 4.4, Minimum Engine Oil Pressure

At Idle Speed:

psi (kPa)

Table 4.4, the CHECK

*

At Rated RPM:

psi (kPa)

A sudden increase in oil temperature that is not
caused by a load increase may indicate mechani­cal failure. Bring the vehicle to a safe stop and
investigate the cause to prevent further damage.
Do not operate the vehicle until the cause has
been determined and corrected.

During normal operation, drive axle oil temperature
gauges should read as follows:

•

160 to 220°F (71 to 104°C) for Detroit™and
Meritor

•

180 to 200°F (82 to 93°C) for Dana Spicer®
drive axles

™

drive axles

Engine Oil Temperature Gauge

NOTICE

A sudden increase in oil temperature that is not
caused by a load increase may indicate mechani­cal failure. Bring the vehicle to a safe stop and
investigate the cause to prevent further damage.
Do not operate the engine until the cause has
been determined and corrected.

During normal operation, the optional engine oil tem­perature gauge should read:

4.8