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15-390000-00
HFM (intake air
temperature)Cooling fan
module
DSI 6 A/T (ATF
temperature)Coolant
temperature
sensor
Refrigerant
pressure sensor
Relay box
(12) Cooling fan control
A. Overview of cooling fan and A/C compressor
The cooling system maintains the engine temperature at an efficient level during all engine operating
conditions. The water pump draws the coolant from the radiator. The coolant then circulates through
water jackets in the engine block, the intake manifold, and the cylinder head. When the coolant reaches
the operating temperature of the thermostat, the thermostat opens. The coolant then goes back to the
radiator where it cools. The heat from automatic transmission is also cooled down through the radiator
by circulating the oil through the oil pump. ECU controls the electric cooling fans with three cooling fan
relays to improve the engine torque and air conditioning performance.
For detailed information, refer to Chapter "Air Conditioning System".
B. Components
A/C compressor
D20DTR ECU
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15-50
E. Cautions
Use only specified Engine Oil (approved by MB Sheet 229.51) for CDPF. -
Use only specified engine oil (Low Ash Oil) ▶
The vehicle equipped with CDPF should use specific engine oil to improve the engine performance
and fuel economy, and ensure the service life of CDPF. -
Issue with normal engine oil ▶
Sulfur, one of the contents of engine oil is burned and generates soot that is not regenerated by the
DPF. This remains on the filter as ashes and keeps accumulating. Eventually, this ashes will block
the filter. -
Benefit for specified engine oil ▶
Minimized the sulfur content of engine oil which reduces the service life.
Improved fuel economy and emission level of CO2 with high performance and low viscosity.
Increased service life of engine oil with high resistance to temperature. -
-
-
Problems when using unspecified engine oil ▶
The service life of filter may be reduced by 30% or more by the ashes accumulated on the filter.
The fuel economy may be reduced because of engine rolling resistance, frequent regeneration of
DPF. -
-
These problems are also caused by oil with high sulfur content, such as tax exemption oil and
heating oil, etc. *
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01-91113-01
4. DIAGNOSTIC INFORMATION AND PROCEDURE
1) Oil Leak Diagnosis
Most fluid oil leaks are easily located and repaired by visually finding the leak and replacing or repairing
the necessary parts. On some occasions a fluid leak may be difficult to locate or repair. The following
procedures may help you in locating and repairing most leaks.
Finding the Leak ▶
Identify the fluid. Determine whether it is engine oil, automatic transmission fluid, power steering
fluid, etc.
Identify where the fluid is leaking from. -
-
After running the vehicle at normal operating temperature, park the vehicle over a large sheet
of paper.
Wait a few minutes.
You should be able to find the approximate location of the leak by the drippings on the paper. ·
·
·
Visually check around the suspected component.
Check around all the gasket mating surfaces for leaks. A mirror is useful for finding leaks in
areas that are hard to reach.
If the leak still cannot be found, it may be necessary to clean the suspected area with a
degreaser, steam or spray solvent. -
-
Clean the area well.
Dry the area.
Operate the vehicle for several miles at normal operating temperature and varying speeds.
After operating the vehicle, visually check the suspected component.
If you still cannot locate the leak, try using the powder or black light and dye method. ·
·
·
·
·
Clean the suspected area.
Apply an aerosol-type powder (such as foot powder) to the suspected area.
Operate the vehicle under normal operating conditoins.
Visually inspect the suspected component. You should be able to trace the leak path over the
white powder surface to the source. -
-
-
- Powder Method ▶
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01-131113-01
Leakage Test ▶
Warm the engine up to normal operating temperature.
Disconnect the negative battery cable.
Remove the spark plugs.
Check the coolant level by opening the coolant reservoir cap and replenish if insufficient.
Open the engine oil filler cap.
Connect the tester to air pressure line and adjust the scale of tester.
Install the connecting hose to spark plug hole.
Position the piston of No.1 cylinder at TDC by rotating the crankshaft.
Connect the connecting hose to tester and measure the leakage volume after blowing up
5 bar of compressed air. -
-
-
-
-
-
-
-
-
Measure the leakage volume in the completely opening condition of throttle valve by pulling the
acceleration cable. -
Perform the pressure test according to the firing order. -
Firing Order: 1 - 3 - 4 - 2 -
Compare the leakage pressure with the specifications. -
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07-91452-01
6) Alternator
Alternators are equipped with internal regulators.
Unlike three-wire generators, the alternator may be used with only two connections: battery positive and
an "D+" terminal to the charge indicator lamp.
As with other charging systems, the charge indicator lamp lights when the ignition switch is turned to
RUN, and goes out when the engine is running.
If the charge idicator is on with the engine running, a charging system defect is indicated. This indicato
r
light will glow at full brilliance for several kinds of defects as well as when the system voltage is too high
or too low.
The regulator voltage setting varies with temperature and limits the system voltage by controlling roto
r
field current.
Achieve correct average field current for proper system voltage control by varying the on-off time. At high
speeds, the on-time may be 10 percent and the off-time 90 percent.
At low speeds, with high electrical loads, the on-time may be 90 percent and the off-time 10 percent.
7) Charging System
Generators use a new type of regulator that incorporates a diode trio.
A Delta stator, a rectifier bridge, and a rotor with slip rings and brushes are electrically similar
to earlier generators.
A conventional pulley and fan are used.
There is no test hole.
8) Starter
Wound field starter motors have pole pieces, arranged around the armature, which are energized by
wound field coils.
Enclosed shift lever cranking motors have the shift lever mechanism and the solenoid plunger enclosed
in the drive housing, protecting them from exposure to dirt, icy conditions, and splashes.
In the basic circuit, solenoid windings are energized when the switch is closed.
The resulting plunger and shift lever movement causes the pinion to engage the engine flywheel ring
gear.
The solenoid main contacts close. Cranking then takes place.
When the engine starts, pinion overrun protects the armature from excessive speed until the switch is
opened, at which time the return spring causes the pinion to disengage.
To prevent excessive overrun, the switch should be released immediately after the engine starts.
Page 388 of 751

04-58210-01
1. DESCRIPTIONS OF INDICATOR DISPLAY
Tachometer
SSPS warning light
Immobilizer indicator
Glow indicator
ESP indicator/warning light
Front fog light indicator
High beam indicator
ESP OFF indicator
Seat belt reminder (driver’s seat)
Seat belt reminder (passenger’s seat)
Engine oil pressure warning light
LCD Display
Engine overheat warning light
Engine check warning light
Auto cruise indicator
Light indicator
Winter mode indicator 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.Engine hood open warning light
Battery charge warning light
Hazard Indicator
Water separator warning light
Air bag warning light
4WD CHECK warning light
4WD LOW indicator
4WD HIGH indicator
Speedometer
Turn signal indicator
Coolant temperature gauge
Brake warning light
Door ajar warning light
ABS warning light
Fuel gauge
Low fuel level warning light 18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33. It sends and receives information to/from each unit through CAN communication line. The LCD display
and separate ESP ON/OFF indicator are newly added.
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04-20
3. WARNING LIGHTS AND INDICATORS
ESP OFF Indicator
This lamp comes on when
pressing the "ESP OFF" switch or
the ESP system is defective.
When the ESP system is
activated, this lamp blinks and a
chime sounds.
Immobilizer Indicator
This indicator comes on
when the ignition key is
communicating with the
engine control unit for
approx. 0.5 seconds.Glow Indicator
When the ignition key is turned
ON, this indicator lamp comes on
and the combustion chamber is
warmed up. In the vehicle
equipped with direct injection type
engine, this indicator may come
on very shortly or may not come
on.
Fog Lamp / Headlamp
High Beam Indicator
This lamp comes on when
the fog lamp or high beam
headlamp operates to
indicate the operating
status.Engine Oil Pressure Warning
Light
This lamp comes on if there is any
fault in the engine oil system and
goes off when a certain amount of
time has elapsed after turning ON
the ignition switch.
Door ajar warning
light
This light comes on
when a door or
tailgate is either
opened or not closed
completely.Brake warning light
This warning light comes on
and warning buzzer sounds
when the parking brake is
applied and/or the brake fluid
level is lower than specified
level.Seat belt warning lamp
The seat belt warning light comes on and
the seat belt warning chime sounds for 6
seconds when the ignition switch is
turned to "ON" position unless the
driver's seat belt is securely fastened.
This reminding operation stops when the
driver fastens the seat belt.
Engine Coolant Overheat
Warning Light
When the coolant temperature is
abnormally hot (over 120℃), this
warning light blinks and a warning
buzzer sounds at 1 Hz. (check
cooling system)
SSPS warning light
This warning light comes on when
the SSPS system is defective.
When this warning light comes
on, the steerability becomes
heavier.
Page 451 of 751

01-53680-01
2. FEATURES AND SPECIFICATIONS
1) Specifications
Description DSI M78 (6-speed) Remarks
Gear ratio1st 3.53:1
2nd 2.14:1
3rd 1.48:1
4th 1.16:1
5th 0.87:1
6th 0.68:1
Reverse 3.09:1
Transmission
fluidFluid Fuchs ATF 3292
Capacity Approx. 9.5 L
Change interval Check the fluid at every
30,000 km or 1 year, and
change it if necessary.Under the severe driving
conditions, change the fluid a
t
every 60,000 km.
Resistance of oil
temperature
sensor-20 430.7 ~ 533.9 kΩ
0 146.8 ~ 175.7 kΩ
20 56.74 ~ 65.86 kΩ
100 3.201 ~ 3.399 kΩ
Gear position
sensor1 -
2 -
3 -
D 2.686 kΩ ± 8%
N 5.036 kΩ ± 8%
R 8.953 kΩ ± 8%
P 16.786 kΩ ± 8%
Severe driving conditions? *
Towing a trailer or off-road driving (Inspect the
leak of fl uid at any time, occasionlly)
Taxi, patrol service or delivery service (extended
idling and excessive driving with low speed)
Frequent stop-and-go traffi c, extended idling,
short driving distance -
-
-Driving in a hilly or mountainous terrain,
sandy, or dusty area
Driving frequently at high speed over 170
km/hour
Driving frequently in area where heavy traffi c
under the ambient tem
perature above 32°C
-
-
-