NHTSA ID Number: 10190750
Manufacturer Communication Number: TSB190165-030220
TSB/Document Date: 2021-04-26
Summary
This Technical Service Bulletin describes the verification and resolution to address soot deposits in the intake air connection exhaust gas entrance ports that affects Exhaust Gas Recirculation flow measurements. This is an update to a previously submitted communication.
3/25/2021
Soot or Ice Deposits in the Intake Air Connection and Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
Technical Service Bulletin
Technical Service Bulletin: TSB190165
Released Date: 02-Mar-2021
Soot or Ice Deposits in the Intake Air Connection and Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
Soot or Ice Deposits in the Intake Air Connection and Fault Codes:
1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
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
B6.7 CM2450 B155B
L9
CM2350 L116B
L9 CM2350 L123B
L9 CM2450 L126B
Issue
Symptom:
Active or multiple inactive counts of Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
Root Cause:
Soot deposits in the intake air connection exhaust gas entrance ports are present and have affected EGR flow measurements.
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3/25/2021
Soot or Ice Deposits in the Intake Air Connection and Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
Soot deposits in the intake air connection exhaust gas recirculation (EGR) differential pressure horizontal and vertical ports are
present and have affected EGR flow measurements.
Icing/condensation in the intake air connection exhaust gas recirculation (EGR) differential pressure sensor or horizontal and
vertical ports are present and have affected EGR flow measurements.
Icing may not be present at the time of the repair, but presence of condensation/water droplets in the EGR Differential
Pressure sensor indicates that icing of the sensor is the root cause of this issue.
Verification
Active or multiple inactive counts of Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729.
Resolution
Thoroughly clean the intake air connection exhaust gas entrance ports and exhaust gas recirculation (EGR) differential pressure
horizontal and vertical ports. See Service Bulletin, Exhaust Gas Recirculation (EGR) System Intake Air Connection Inspection
and Cleaning Guidelines, Bulletin 5579934. (/qs3/pubsys2/xml/en/bulletin/5579934.html)
Care should be taken to follow all guidelines/examples of proper cleaning in Service Bulletin
(/qs3/pubsys2/xml/en/bulletin/5579934.html) (/qs3/pubsys2/xml/en/bulletin/5579934.html). Insufficient cleaning has
resulted in repeat occurrences of these fault codes.
Inspect the intake air heater for carbon build up. See corresponding Service Manual. Reference Procedure 010-023 in Section
10.
Inspect the EGR differential pressure sensor. See corresponding Service Manual. Reference Procedure 019-370 in Section 19.
If soot is found, gently wipe away with a clean towel. Be sure not to apply too much pressure on the sensor elements, as
they can become damaged.
If ice or condensation is found (See Figure 1 below), gently wipe away with a clean towel. Be sure not to apply too much
pressure on the sensor elements, as they can become damaged.
If the EGR differential pressure sensor meets specifications according to published troubleshooting, do not replace the
EGR differential pressure sensor. Verify the EGR differential pressure sensor is properly oriented and placed as removed
when installed on the intake air connection.
Follow the “Conditions For Clearing The Fault Code” section in corresponding fault code overview to validate the repair.
Verify fault code is no longer active. If fault code is still active, reference the corresponding fault code troubleshooting tree.
Check ECM Calibration Revision History. Compare the ECM code and revision number in the ECM to the calibration revision
listed in the ECM calibration revision history for this fault code. If a calibration update for this fault code is available, the ECM
calibration revision must be that revision or higher.
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3/25/2021
Soot or Ice Deposits in the Intake Air Connection and Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
Figure 1, Condensation on the EGR Differential Pressure Sensor.
Document History
Date
Details
2019-9-20
Module Created
2020-6-1
Updated title, product affected, issue, verification, and resolution sections.
2020-9-22
Added FC7233.
2020-9-24
Updated text.
2020-9-28
Corrected title to include mention of ice.
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3/25/2021
Soot or Ice Deposits in the Intake Air Connection and Fault Codes: 1866, 3361, 3382, 3383, 3389, 7233 and/or 4729
Date
2021-3-1
Details
Added B6.7 CM2450 B155B and L9 CM2450 L126B.
Last Modified: 02-Mar-2021
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TSB/Document ID: TSB190165-030220
Replacement Service Bulletin Number:
MFR Communication Date: 2021-03-02
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: FUEL SYSTEM, GASOLINE
MFR Component System:
MFR Component Subsystem:
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