Mercedes-Benz ML320. Manual — part 401

AR61.20-P-1105GH

Remove/install bottom engine compartment paneling

22.6.00

MODEL

163.172 with ENGINE 113.942

MODEL

163.174 with ENGINE 113.981

MODEL

163.175 with ENGINE 113.965

P61.20-2017-12

1

Engine compartment paneling

2

Grub screw

3

Plastic clips

Remove/Install

1

Remove grub screws (2) of plastic clips (3)

6 grub screws pins.

Installation: Check grub screws, replace

if necessary.

2

Pull out plastic clips (3)

Installation: Check plastic clips, replace

if necessary.

3

Remove engine compartment panel (1)

Installation: Ensure that engine

compartment panel is positioned correctly.

4

Install in the reverse order

Copyright DaimlerChrysler AG 12.05.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

Page 1

GF00.20-P-2009A

Engine oil monitor function

24.10.96

MODEL

129 with ENGINE 112, 113

MODEL

163 with ENGINE 112, 113, 612

MODEL

168 with ENGINE 166, 668

MODEL

202 with ENGINE 112, 611

MODEL

208 up to 31.7.99 with ENGINE 112, 113

MODEL

210 up to 30.6.99 with ENGINE 112, 113, 611

General
The oil level is constantly monitored by the oil sensor, and the
appropriate data transmitted to the processor by the ASSYST.
Oil replenishments are detected automatically and result in a bonus,
which extends the service interval accordingly.
An excess oil level or insufficient oil level appears in the display
together with the oil can symbol.

Display of low oil level at maximum:
D

at driver request

Display of warnings:
D

automatically, at the earliest 60 s after engine start and oil

temperature greater than 60°C:

D if oil level too high: the oil can symbol appears together
with the readout "OIL LEVEL ABOVE MAX". In addition, a
brief warning signal sounds. (On models not fitted with
multifunction displaly, "HI" appears flashing.)

D

if oil level too low: the oil can symbol appears together with

the readout "OIL LEVEL BELOW MIN". In addition, a brief
warning signal sounds. (On models not fitted with multifunction
display, the oil level warning lamp (A1e12) comes on and the
readout "-2L" appears flashing.)

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D

if oil at minimum: the oil can symbol appears together with

the readout "OIL LEVEL MINIMUM". In addition, a brief
warning signal sounds. (On models not fitted with multifunction
display, the oil level warning lamp (A1e12) comes on.)

D

automatically 13 s after ignition ON:

D if no oil is in engine: the oil can symbol appears together
with the readout "OIL LEVEL BELOW MIN". In addition, a
warning signal sounds. (On models not fitted with multifunction
display, the oil level warning lamp (A1e12) comes on and the
readout "-2L"appears flashing. In addition a brief warning
signal sounds.)

The missing oil quantity displayed no longer changes during the
display. In other words, any change in oil level cannot be observed
directly at the display. The new oil level is only displayed once the
conditions described below exist.

Display of oil quantity at driver request
The text "DISPLAY OIL LEVEL?" appears 10 s after the start switch
has been turned into position "2" (on models not fitted with
multifunction display, the oil can and the clock symbol are displayed).
If the reset button of the trip counter is pressed twice within one sec.
during this readout, for example, "add 1.0L oil" (or "-1.0L")
-----------------------------------------------------------------------------------------

appears in the display if oil level too low. The readout appears only
after the elapse of a waiting time after engine OFF. The waiting time
depends on the engine oil temperature.
It is
D

up to 20°C

30 minutes

D

from 60°C

1 minute

D

The waiting time is between these two limits at other engine oil
temperatures.

Possible readouts are (text in parenthesis relates to models not fitted
with multifunction display.):
D

"OIL LEVEL OKAY" ("o.k."),

D

1.0L, 1.5L, 2L,

D

"Overfilling" ("HI"),

D

"OBSERVE WAITING TIME" (clock symbol flashing and oil can
symbol),

D

"DISPLAY OIL LEVEL" (clock and oil can symbols.)

If there is a fault at the oil sensor (oil level/temperature/quality, B40)
the oil can symbol and the text "OIL LEVEL SENSOR FAULTY"
appears only 30 s after the fault has occurred.
(On models not fitted with multifunction display, the oil level warning
lamp (A1e12) comes on accordingly.)
For diagnosis, read also the injection system control module (N3)
with the HHT. (The instrument cluster (A1) receives the sensor data
through the CAN from the injection system control module (N3)).
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Oil change
The ASSYST has to be reset each time the oil is changed. Resetting
ASSYST also resets the remaining time and the remaining distance.
Resetting can be performed at the instrument cluster or using the
HHT.
The following data are stored when the system is reset:
D

current kilometer reading rounded off to 100,

D

total oil replenishments in the last interval,

D

remaining distance,

D

remaining time,

D

product of the quality factors,

D

the data of the last 5 resettings in 5 data sets

These data can only be read with the HHT!

If the specified quantity of oil is not replenished when the oil is
changed, the (internal) start distance is reduced.

Detecting oil replenishments
D

With the HHT it is possible to retrieve the last 10 oil
replenishments and the corresponding kilometer readings of
the current interval.

D

In the normal case, detection of an oil replenishment is
displayed by the remaining distance in the instrument cluster
being extended

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Page 1

Oil replenishments are always only detected once the following
conditions are met:
D

the replenished quantity is at least 1 l

D

after replenishing the oil, the car must be driven a distance of at
least 5 km under normal driving conditions at an oil
temperature of at least 60 °C.

There are instances, however, in which the readout of the remaining
distance nevertheless appears implausible after replenishing oil;
according to the display, no bonus or only a small bonus has been
issued. This is caused by the fact that the remaining distance is
always only displayed within a range from 15 000 km up to 30 000
km (or 20 000 km up to 40 000 km in the case of engine 668), but
internally the system calculates with the actual values which may also
be beyond this range. These internal values can only be displayed
with the HHT.

In the charts overleaf, a number of examples of this are presented.
The horizontal (x) axis represents the service interval and the vertical
(y) axis is the remaining distance in each case in km.
The readout of ASSYST in the instrument cluster always moves
within the light range.
The remaining distance calculated internally may also, however, be
within the two dark ranges. These internal values can only be
displayed with the HHT.
All examples relate to gasoline engines fitted with an oil sensor.

P00.20-0201-06

Example 1 :
Sufficient oil was added during the oil change.
This means that the starting distance is 15
000 km.
After 10 000 km oil is topped up under normal
driving conditions (a). The bonus (B1) is
issued and displayed. What this means is that
when the remaining distance is retrieved, a
greater remaining distance is displayed.
(Provided the aforementioned conditions for
detecting the oil replenishment are met.)
Oil is topped up again after a further
5 000 km (b). In this case also a bonus (B2) is
issued and displayed.
If, after this, no further oil is topped up and
the car continues to be driven in the same
manner, a service interval of about
24 000 km is thus achieved.
In this example, the curve moves at all points
within the light range of the chart;
consequently, all the oil replenishments are
displayed by increasing the remaining
distance.

P00.20-0204-06

Example 2:
The specified quantity of oil was added when
the oil was changed.
The car is driven under very favorable
conditions and oil is topped up after
10 000 km (a). Internally, the bonus B1 is
issued, the service interval is extended
accordingly by enlarging the remaining
distance. However, as the curve is sometimes
within the shaded area, only the part of B1
which is within the light area, is at first
displayed as an extension of the remaining
distance. (Provided the aforementioned
conditions for detecting oil replenishment are
met.)

Oil is topped up once again at 18 000 km (b).
In view of the fact that the maximum service
interval of 30 000 km was exceeded, the
bonus B2 is not initially displayed as an
extension. The entire service interval in this
case is 30 000 km.
If, from point b, the car continues to be driven
under less favorable conditions, it may still
also be possible now to achieve the maximum
service interval of 30 000 km because of the
internal bonus B2.

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Page 2

P00.20-0202-06

Example 3:
When the oil was changed, the quantity
added was less than the specified quantity.
Consequently, the start distance is less than
15 000 km.
If oil is now topped up after 5 000 km (a), the
remaining distance displayed is not extended
as the curve is within the shaded area. The
bonus B1 is nevertheless added internally
and results in an extension of the service
interval to slightly more than
15 000 km - provided the driving conditions
remain the same or are more favorable.

(The service interval of 15 000 km is always
reached, however, even if the internal value
were less.)

P00.20-0203-06

Example 4:
Oil has been topped up after 5 000 km under
unfavorable driving conditions (a) and the oil
replenishment (bonus B1) detected internally.
We now have two cases to consider:

D

If the car continues to be driven under
the same conditions (unbroken line), the
remaining distance displayed is not
extended as the curve is within the
shaded area.
The service interval in this case is
nevertheless 15 000 km although the
internal value is less. (The remaining
distance displayed can always only be
within the light area.)

D

If the car continues to be operated
under more favorable conditions
(broken line), the value of the internal
remaining distance slowly moves into
the light area. Consequently, the service
interval may be greater than
15 000 km.

Active service system survey of display
facilities

GF00.20-P-0003-04A

Active service system technology/ influencing
variables

GF00.20-P-0003-05A

Active service system survey
model/engine/sensor/instrument cluster

GF00.20-P-0003-06A

Active service system (ASSYST) operating
instructions, resetting

GF00.20-P-0003-01A

Oil sensor position/task/function

Oil sensor position, task, function

GF18.40-P-4111A

Copyright DaimlerChrysler AG 05.06.2006 CD-Ausgabe G/10/04 . This WIS print-out will not be recorded by Modification services.

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