LI07 04-N-066219 Service Bulletin/Repair Instructions

Engine diagnosis warning lamp active, malfunction at exhaust back pressure sensor

Topic number
LI07.04-N-066219
Version
3
Design group
07.04 Sender, Feeler, Sensors
Date
07-13-2017
Validity
906 with Engine 642 and 651
Reason for change
Added DTCs and example of incorrect reading
Reason for block
Complaint:
Engine diagnosis warning lamp is active; engine power output is reduced. A fault relating to the exhaust back pressure sensor (B60) is stored in the engine control unit.

CDI6 (OM642)

118900 Component B60/4 (Exhaust back pressure sensor) has a plausibility error.

CDI60 / CR60NFZ (OM642)

P159300 | There is an internal fault in component 'B60/4 (Exhaust back pressure sensor)'. | CR60NFZ047162,

P159400 | There is an internal fault in component 'B60/4 (Exhaust back pressure sensor)' | CR60NFZ

P159600 | The signal line of component 'B60/4 (Exhaust back pressure sensor)' has a short circuit to ground |

CR60NFZ

CR43NFZ (OM651)

P047162 Exhaust back pressure sensor 1 has a malfunction. The signal comparison is faulty.
Cause:
An incorrect exhaust back pressure sensor may have been installed during previous repairs.

There are two types of back pressure sensors used, absolute pressure sensor and relative pressure sensor.

Although the sensors look the same and will fit in the same locations they are different and the vehicle may have the

incorrect sensor installed.

The actual value of the exhaust back pressure sensor (B60) with engine OFF is implausible.

The exhaust back pressure is approx. 2 bar or the exhaust back pressure deviates with engine OFF by approx. 300 400 mbar from the other pressure sensor
07-13-2017 2:48 PM

© Copyright Daimler AG
DAVANDE
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Example:

Check component "B60/4 (Exhaust back pressure)" by means of actual value

Status of associated actual values

Name

Exhaust temperature upstream of turbocharger - 38°C

Exhaust back pressure (raw value) - 0.50v

Exhaust back pressure - 504hPa

Atmosperic pressure -
979hPa
Intake air pressure -
977hPa
Attachments

File
Description
vents.JPG
Relative pressure sensor with vent hole shown
Remedy:
As of model year 2013 (SA code 803), an absolute exhaust back pressure sensor is used.

Relative pressure sensor Engine 642:

A006 153 60 28 - (replaced by)

A007 153 43 28 - (replaced by)

A009 153 50 28 - (with vent hole next to contact springs at sensor) *

Relative pressure sensor Engine 651:

A651 905 02 00 - (replaced by)

A009 153 51 28 - (with vent hole next to contact springs at sensor) *

Absolute pressure sensor Engine 642/651:

A009 153 52 28 - (replaced by)

A000 905 27 06 - (without vent hole) *

Note: Engine wiring harness - A642 150 90 89 may be required, check EPC

* As of this posting the part numbers listed are for reference purposes, always verify the current part number in EPC

by Vehicle Identification Number (VIN) to ensure the correct sensor is used.
Attachments

File
Description
harness.JPG
Engine Wiring harness
07-13-2017 2:48 PM

© Copyright Daimler AG
DAVANDE
Page 2/3
Symptoms

Power generation / Engine management / Engine performance / Goes into limp-home mode
Parts

Part number
ES1 ES2 Designation
Quantity Note
EPC
A 009 153 50 28
Pressure Sensor *
1
Relative (OM642)
X
A 009 153 51 28
Pressure Sensor *
1
Relative (OM651)
X
A 000 905 27 06
Pressure Sensor *
1
Absolute (OM642/651)
X
A 642 150 90 89
Engine Wiring Harness
1
As required by EPC
X
Attachments

vents.JPG:
harness.JPG:
07-13-2017 2:48 PM

© Copyright Daimler AG
DAVANDE
Page 3/3

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