NHTSA ID Number: 10135871
Manufacturer Communication Number: LI07.04-P-061585
TSB/Document Date: 2018-05-07
Summary
Check engine light with DTC 256809: PremAir sensor has a malfunction
Check engine light with DTC 256809: PremAir sensor has a malfunction
Topic number
LI07.04-P-061585
Version
1
Design group
07.04 Senders, sensors
Date
06-08-2015
Validity
S400 (221.195) Hybrid
Reason for change
Reason for block
Complaint:
Check engine light is illuminated.
Cause:
Engine SW correction for PremAir sensor diagnosis.
Remedy:
1. Print-out and or save a copy of the initial short test, fault code freeze frame data via the ME DTC menu, and a ME
ECU log.
2. Insure that the vehicle has not been in an accident.
3. Insure that the correct radiator is installed (PZEV radiator = black catalytic coating).
4. Insure the radiator is not damaged or obstructed.
5. Perform a function test of the premair sensor (code must be present). If the test does not pass, then erase the code and perform a function test via the guided test menu. In the event the function test is performed on a hybrid model,
then monitor if the function test is inconclusive (i.e. there are no test result data at the conclusion of the test [numerical
or graph]).
6. Check glycol/water mixture.
7. Check the ground circuit of the premair sensor via a DVOM first and then visually (ground stud must be clean).
8. Check pin bushing tension of premair sensor connector.
9. If steps 1-8 are OK, Update the ME17.7 control unit with the latest software using add-on 4585 for XENTRY version
05/2015 or later
Symptoms
Power generation / Engine management / Engine management indicator lamp / Engine diagnosis / lit
Control unit/fault code
Control unit
Fault code
Fault text
MED 17.7-Motor electronics for direct injection 17.7
(MED177)
P256809
The PremAir sensor has a malfunction.There is a component
fault.
06-11-2015 8:53 PM
© Copyright Daimler AG
GGUNTHE
Page 1/2
WIS-References
Document number
Title
AR07.04-P-5004GZH
Remove/install radiator
identification sensor
Note
Allocation
Parts
Validity
Vehicle
Engine
221.195
*
*
Vehicle
Engine
221.195
272.974
722.950
Full model designation breakdown
06-11-2015 8:53 PM
© Copyright Daimler AG
GGUNTHE
Page 2/2
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TSB/Document ID: LI07.04-P-061585
Replacement Service Bulletin Number:
MFR Communication Date: 2015-06-08
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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