Just Change the O2 Sensors and the Mercedes Ml320 Couple of Months Ago and Its Acting Up Again

Many drivers accept had difficulty completing readiness monitors for their Mercedes Benz. The two readiness monitors that seem to be the most stubborn to complete are: Secondary Air Injection and Catalyst (Catalytic Converter). We located a Mercedes Benz Service Message (S-B-fourteen.00/17) that may exist helpful.

Also, one customer with a 2002 Mercedes was unable to complete the secondary air injection monitor until one evening he allowed his vehicle to idle for 5-xx minutes in his driveway. He and so turned off his vehicle and restarted the vehicle the next forenoon and allowed it to idle for another v-10 minutes. He stated that this process completed the AIR readiness monitor.

UPDATE:
Our customer had a stubborn CATALYST MONITOR on his 2002 Benz. He had already driven hundreds of miles and nonetheless the catalyst monitor was incomplete. The following drive bike did the fox:

Goad MONITOR DRIVE CYCLE

• Vehicle warm upwards
• A/C Off
• Drive 3 minutes at 43 mph in D
• Bulldoze three minutes at 51 mph in D
• Stop and let idle for 3 minutes in P

Mercedes Benz Service Bulletin (Southward-B-14.00/17)

Discipline: Land I/M (emission inspection and maintenance) Facilities Incorporating an OBDII Check
A. Description of State I/Thousand OBDII Checks & Drive Wheel
B. Models, Model Years & OBDII Systems Included
C. Drive Bike Test Procedure
Notation:
Refer to Service Information: P-SI-fourteen.00/14 for historical information.
A. Clarification of Land I/M OBDII Checks & Drive Bike
Sure States around the land have or will brainstorm to roll-out in the coming months, OBDII (On-Board
Diagnostic Ii) quick checks for emission inspection and maintenance (I/M) testing. The emission I/M testing
is required for customers to annals their vehicles. These State I/M facilities will specifically look for whether
or non the vehicle's OBDII system is "set" to be tested. The OBDII arrangement uses readiness codes congenital into
the vehicles computer to indicate if the system is "ready" to be emission tested. These Land I/M Facilities
use hand held browse tools capable of reading OBDII codes and will indicate if these readiness codes are set
or not.
These readiness codes are needed to be set (complete) within the OBDII computer system. Without these
codes set, the vehicle will nearly likely fail the emissions portion of this inspection and the customer volition not
be able to register or re-register their vehicle. In an attempt to prevent this situation from happening, a specific
drive cycle must be performed prior to the vehicle existence tested at any I/Thousand facility checking the OBDII
system.
2 S-B-14.00/17 February 2004
If a model year 1996 through 1999 vehicle has "failed" a State I/1000 emission test and no faults accept been
found in the system (i.eastward. check engine light NOT on) so a drive cycle test must be performed on the
vehicle.
Note:
A battery disconnect to service the vehicle tin can impact whether the readiness codes will be prepare, if the
vehicle is immediately taken from the service facility to an I/M testing facility for vehicle registration
purposes. In such a case, the client should be notified and instructed not to take the vehicle
immediately to an I/Thousand station for emission testing.
Note:
Cycling the ignition key from on – to – off prior to performing the I/G test is not recommended.
B. Models, Model Years & OBDII Systems Included
1. A drive cycle has been developed for the following model years and models:
MY1996
S420 (w/ME1.0 OBDII system)
S500, S500C & SL500 (w/ME1.0 OBDII organisation)
MY1997
C230 & E320 (w/ME2.1 OBDII system)
C280 (w/ME2.ane OBDII system)
S320, SL320 & C36 AMG (due west/ME2.1 OBDII system)
E420, S420, S500, SL500, S600, SL600 (w/ME1.0 OBDII system)
MY1998
C230 & SLK230 (westward/ME2.one OBDII system)
S320 (westward/ME2.1 OBDII organization)
S420, S500, CL500, SL500, S600, CL600 & SL600 (w/ME1.0 OBDII system)
MY1999
C230 & SLK230 (w/ME2.ane OBDII system)
S320 (w/ME2.1 OBDII system)
S420, S500, CL500, S600, CL600 & SL600 (w/ME1.0 OBDII system)
2. On-Lath Diagnostic System (OBDII) used on the vehicle, are ME1.0, ME2.0 or ME2.one systems.
3. Performing the bulldoze wheel on the vehicle will take up to 1 1/2 hours.
4. Required tools are: SDS equipment and all required cables.
C. Bulldoze Bike Test Procedure

S-B-fourteen.00/17 Feb 2004 three
Note:
Readiness/function codes cannot exist displayed for tests performed on vehicles at altitudes above 8200 anxiety.
Annotation:
Depending on engine temperature you may perform the testing starting with EVAP system (encounter step vii)
or start with steps ane through 4 or continue to step 6 (Air injection Diagnostics). Remember, these tests
are all based on engine temperature.
Notation:
When using an SDS to cheque vehicle readiness codes, notation the following:
i. Open up vehicle hood.
2. Either remove the SDS connector encompass or the engine fuse box embrace depending on the model.
3. Attach/connect SDS connector.
4. Enter into the CARS function.
5. Select right Chassis line
half dozen. Select the gasoline engine for engine type.
seven. On the screen labeled Main Function Groups, select Choice 1 Gasoline Engine.
viii. Select the ME organization and press enter.
9. Start the vehicle to enable communication between the module and SDS system.
x. In the Functions screen, become to option iii: Bodily Values and press enter, you are now set up to brainstorm
the testing.
11. For steps 1 through seven: For ME2 under Actual Values select pick 12 Completed Test and press
enter, for ME1 nether Actual Values Option 9 Performed Tests.
12. Coil through the screens to find the applicative step information and identify whether a check marker
or F has been highlighted
Drive Cycle Test Procedure Explained
1. 02 Sensor Heater Diagnostics (do not interrupt this portion of the test):
With the engine warm (greater than 80 degrees C), and the transmission gearshift lever in Park
position, proceed as follows:
• Starting time engine and increase engine speed to between ii,000 to 2,500 RPM for 2 minutes.
• After the 2 minutes, run engine at idle speed, with no applied load for half-dozen minutes (Air
conditioning OFF, no throttle movements etc).
• After this fourth dimension catamenia has been obtained proceed to step 2 below.
Note:
If using a Hand-Held Scan Tool verify Step ane examination completion. This will be indicated by a check mark in the
display field or the word PASS.
2. Lambda (02) Sensor Bespeak (do not interrupt this portion of the examination, to be conducted straight subsequently
step i above has been performed):
With engine temp greater than fourscore degrees C, and with manual gearshift lever in position D,
• Drive vehicle for three minutes at 70km/h (43 mph).
• After the three minutes has been reached proceed to step 3 below.
Note:
If using a Manus-Held Scan Tool verify Footstep 2 test completion. This will exist indicated by a bank check mark in the
display field or the word Pass.
three. Catalytic Converter Efficiency Diagnostics (do not interrupt this portion of the examination and must be
conducted directly after step 2 above has been performed):

With engine temp greater than 80 degrees C:
four Due south-B-14.00/17 Feb 2004
• Drive vehicle with transmission yet in position D for 3 minutes at 80-ninety km/h (48-54 mph).
Note:
If using a Paw-Held Browse Tool verify Step three test completion. This will exist indicated by a check mark in the
display field or the word PASS
four. Self-aligning of the air/fuel mixture (idle speed & self adaptation) (practice not interrupt this
portion of the test and must be conducted directly after step iii has been performed):
With engine temp greater than 80 degrees C, proceed equally follows:
• Identify transmission gearshift lever into Park position and allow engine to idle (with no load
applied to the vehicle, i.east. Air conditioning OFF) for 3 minutes.
Note:
If using a Hand-Held Scan Tool verify Footstep four test completion. This will be indicated past a bank check mark in the
display field or the word PASS
5. EGR System (Emission Vacuum Diagnostics): No DTC codes should stored for the intake
manifold pressure sensor and EGR pressure transducer during this portion of the test. With the
engine temperature at 80 degrees C:

• Start and Drive vehicle (in D position) and then accelerate smoothly up to 2000 rpm, and
and then decelerate smoothly back downwards to 1100 rpm.
Note:
If using a Manus Held Scan Tool to verify test completion. This will be indicated by a check mark in the
brandish field or the discussion Pass
• Afterward this test step has been completed, turn ignition OFF, look 10 seconds and repeat this
test step (5.) again.
half dozen. Air Injection Diagnostics: (do not interrupt this exam when performing this test step 6).
Notation:
First: Identify a suitable auxiliary fan in forepart of the vehicle to strength engine cool down. (Engine absurd down can
besides be simulated by using a decade box to simulate engine cool downwards).
Go on examination step: With engine temperature less than twoscore degrees C, the air workout OFF and the
transmission gearshift lever in Park position; and auxiliary fan removed from front of vehicle,

• First engine and accelerate engine speed to 1400 rpm.
• Allow engine to run at this increased rpm until coolant temperature reaches between 70 to
106 degrees C.
• Allow engine to run with increased rpms for 7 minutes (or drive the vehicle for vii minutes).
• After the 7 minute time period has been reached, end the vehicle, place gearshift lever into
Park position and allow engine to idle (with no load) for six seconds. Do non use A/C.
• Afterwards this pace plow the ignition OFF, wait x seconds and repeat this test step.
• Note that when testing the air injection organization, the engine coolant temperature must be at
the aforementioned temperature (degrees) equally when earlier the ignition primal was switched off in the
prior test stride.
Annotation:
If using a Manus-Held Scan Tool to verify Step 6 test completion. This will exist indicated by a check mark in
the display field or the word PASS
Due south-B-14.00/17 February 2004 5
vii. Fuel Arrangement Leak test (EVAP): No DTC codes should exist present in retentiveness for the EVAP
canister purge valve, fuel tank pressure sensor, or the shut-off valve.
Note:
Prior to performing this test (7) step:
• Ensure the fuel tank fuel level is betwixt ¼ and ¾ full and
• The engine temperature less than 100 degrees C with air intake temperature less than 45
degrees C.
• With gearshift lever in Park position, start and idle engine for 20 minutes (with no load).
Notation that if after the 20 minutes of idling time has elapsed and no readiness codes were
set, consider driving the vehicle for an additional 20 minutes.
• After these 20 minutes has elapsed, plow ignition OFF, wait x seconds and repeat this test
footstep again.
Note:
If using a Paw Held Scan Tool to verify Step 7 test completion. This will be indicated by a cheque mark in
the display field or the discussion PASS
ir.

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Source: http://justsmogs.com/2016/06/mercedes-drive-cycle-for-incomplete-readiness-failed-smog-check/

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