TSB190181-110420

11/21/2019
Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect Installation: Fault Codes 3361, 3389, 3382 and 3383
Technical Service Bulletin
Technical Service Bulletin: TSB190181
Released Date: 04-Nov-2019
Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect
Installation: Fault Codes 3361, 3389, 3382 and 3383
Exhaust Gas Recirculation (EGR) System
Differential Pressure Sensor Incorrect Installation:
Fault Codes 3361, 3389, 3382 and 3383
Warranty Statement
The information in this document has no effect on present warranty coverage or repair practices,
nor does it authorize TRP or Campaign actions.
Contents
Product Affected
B6.7 CM2350 B121B
ISB6.7 CM2350 B101
ISL9 CM2350 L101
L9 CM2350 L116B
L9 CM2350 L123
Issue
Symptoms:
Yellow check engine light
Low engine power
Fault Codes 3361, 3389, 3382 and 3383
Engine surge
Root Cause:
Installing the differential pressure sensor 180 degrees off original orientation.
Differential pressure sensor will read negative pressure if mounted incorrectly and will cause
inaccurately controlled flow into the air intake manifold.
Verification
Use steps below, in sequential order, to determine if differential pressure sensor is installed
correctly:
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Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect Installation: Fault Codes 3361, 3389, 3382 and 3383
Verify the engine wiring harness connector reaches the differential pressure sensor connector.
The air intake connection has a lip and provides reference as to the correct orientation of the
differential pressure sensor. The air intake connection lip can look different on different
engines families. Two examples of the air intake connection lip are shown in Figure 1 below.
Verify if there is interference between the differential pressure sensor and the lip on the air
intake connection. See Figure 2 below.
Figure 1, Examples Of Air Intake Connection Lips. Left: L9 Right: B6.7.
Air intake connection lips (1) look different when comparing two engines.
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Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect Installation: Fault Codes 3361, 3389, 3382 and 3383
Figure 2, Incorrectly Installed Differential Pressure Sensor.
This interference (1) is proof that the differential pressure sensor is installed incorrectly.
Figure 3, Correctly Installed Differential Pressure Sensor.
There is no interference (1) when the differential pressure sensor is installed correctly.
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Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect Installation: Fault Codes 3361, 3389, 3382 and 3383
Some engines are painted after assembly with differential pressure sensor installed. If any
unpainted surface can be seen on engines after installation, this indicates the differential
pressure sensor was installed incorrectly. An example can be seen in Figure 4 below.
Figure 4, Differential Pressure Sensor Location Without Sensor Installed.
If installed incorrectly, this unpainted surface (1) would be visible.
Resolution
While installing the differential pressure sensor perform the following:
Locate the air intake connection lip. Differential pressure sensor 90 degree cornered side
must be on the opposite side of the air intake connection lip.
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Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect Installation: Fault Codes 3361, 3389, 3382 and 3383
Figure 5, Differential Pressure Sensor With Sides Marked.
The two sides of the differential pressure sensor are the cornered side (1) and the side that must
be connected to the opposite side of the air intake connection lip (2).
Verify differential pressure sensor is completely flat before tightening capscrews. If installed
incorrectly, the air intake connection lip would make differential pressure sensor uneven on the
surface. See Figure 6 below.
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Exhaust Gas Recirculation (EGR) System Differential Pressure Sensor Incorrect Installation: Fault Codes 3361, 3389, 3382 and 3383
Figure 6, Incorrectly Installed Differential Pressure Sensor Sitting Unevenly On The Air Intake
Connection Lip.
If the differential pressure sensor is installed incorrectly, the differential pressure sensor will lay
unevenly on the air intake connection lip (1).
Verify no unpainted surfaces are visible at the location as shown in Figure 4 above.
Document History
Date
2019-10-28
Details
Module Created
Last Modified: 04-Nov-2019
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