C63/GTx 177/178 Check Engine Light on
with Misfire DTC's. Engine Running Roughly
Topic number

LI54.21-P-062006

Version

8

Function group

54.21 Control units / basic modules

Date

12-03-2018

Validity

Model 190.3##
Model 190.4##
Model 205.#8#

Reason for change

Added VC location picture

Reason for block

Complaint:

Engine running rough / Fault code entry
Possible fault codes:
P030185 - Combustion misfiring of cylinder 1 was detected.
P030285 - Combustion misfiring of cylinder 2 was detected.
P030385 - Combustion misfiring of cylinder 3 was detected.
P030485 - Combustion misfiring of cylinder 4 was detected.
P030585 - Combustion misfiring of cylinder 5 was detected.
P030685 - Combustion misfiring of cylinder 6 was detected.
P030785 - Combustion misfiring of cylinder 7 was detected.
P030885 - Combustion misfiring of cylinder 8 was detected.
P030022 - Combustion misfiring was detected

Cause:

Misfire detection protocol in ME SW

Attachments
File

Description

IMG_3273.JPG

Example image of ceramic damage on spark plug

20150609_105958.jpg

Example image of electrode damage on spark plug

Remedy:

Check that the ME Control Software is up to date at version VC 5.1 or later (located in the ME CUL, see the attachments for location)
12-03-2018 4:23 PM
© Copyright Daimler AG

HENRAND

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If ME Control Unit Software is NOT up to date:
1.
2.
3.
4.
5.

If ME Control Unit Software is not up to date, update it along with the VGS, PTCU, and FSCU control units.
Ensure that all ignition coils are pare number A 177 906 95 00
After updating, clear out the mixture adaptation data and perform 2 AMG Engine Adaptation Drives
Create a PTSS case and upload the old (showing the fault codes) IQT, the new (after ME update) IQT, and the
injector perofmance data AFTER performing the 2 AMG Engine Adaptation Drives.
The data will be reviewed and you will be given instructions on whether to release the vehicle or perform further
adaptations

If ME Control Unit Software IS up to date:
1) Smoke test intake/exhaust and check for leaks. NOTE: The intakes to the turbochargers as well as the tubes from
the turbochargers to the intercoolers must be tested.
•
•

Repair as necessary.
If no leaks are found, or repair does not remedy complaint proceed to step (2).

2) Inspect ignition coils and verify they are PN: A 177 906 95 00.
•
•

Replace as necessary.
If all coils are PN A 177 906 95 00 swap the coil(s) of the misfiring cylinder(s) with those of cylinder(s) that are
not misfiring and road test the vehicle.
•
If the misfires move with the coils, replace the coils and the spark plugs on original misfiring cylinders
•
If the misfires do not move with coils, or if the misfires do not reappear proceed to step (3)

3) Perform a Xentry guided high pressure fuel test from cold start and obtain the injector performance data, and initial
quick test with fault freeze
•
•

If the test fails for either bank, replace the high pressure fuel pump for that bank.
If the test passes for both banks, road test the car with ECO start/stop disabled and allow the vehicle to achieve
operating temperature
•
Shut the vehicle down and observe the fuel pressures on the left and right banks at t=0, t=30 minutes, t=60
minutes, and t>120 minutes
•
If at any time the fuel pressure drops below the minimum value and/or a large differential exists between the left and right banks, boroscope the cylinders on the bank with low fuel pressure and determine if one or more of the injectors is leaking.
•
If the fuel pressure remains within acceptable limits proceed to step (4)
•
If one or more of the injectors is leaking, open a PTSS case and upload pictures of the leaking
injector(s) taken with the boroscope as well as the information collected via Xentry thus far.
•
Replace the leaking injector(s)
•
Update the IMA coding for the new injectors in their respective cylinders via Xentry
•
Perform 2 AMG Engine Adaptation Drives
•
Upload the new injector performance data and quick test to the case

4) Open PTSS Case if Above do not Remedy the Complaint:
Include in the case:
1.
2.
3.
4.
5.
6.

All Data from step (3)
MED1775 Control Unit Log
Software update check for ME and Transmission control units
Engine Performance Data
Injector Performance Data
Line Graph Version of the Fault counter from Cold Start

12-03-2018 4:23 PM
© Copyright Daimler AG

HENRAND

Page 2/3

7.
8.

PICO Compression Test of ALL Cylinders
Boroscope of cylinder(s) with leaking injector(s)
•
Important: Before performing the boroscope examination, it is imperative that the engine be left to sit until
cold

Attachments
File

Description

Fault Counter.pdf

Line Graph Version of Fault Counter Instructions

AMG Adaptation.docx

AMG Engine Adaptation Drive

vc.png

VC Number Location

Symptoms
Power generation / Engine management / Engine running / Runs rough/shakes
Power generation / Engine management / Indicator lamp / Engine diagnosis / lit

Control unit/fault code
Control unit

Fault code

N3/10 - Motor electronics
'MED1775' for combustion engine 'M177' (ME)

Fault text
-

Operation numbers/damage codes
Op. no.

Operation text

12-03-2018 4:23 PM
© Copyright Daimler AG

Time

HENRAND

Damage
code

Note

54575 90

Use the appropriate damage code
according to the cause

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