K21134562

Solution K21134562
Thursday, May 3, 2018 8:03:58 PM CEST
NA_MACK_Vehicle_Range
NA_MACK_Vehicle_Ran
ge
Cabover , Conventional
NA_VOLVO_Vehicle_Range
NA_VOLVO_Vehicle_Ra
nge
VNR , VNX , VNL , VNM , VHD , VAH
Engine family
Engine family
11L Engine , 13L Engine , 16L Engine , MP7 , MP8 , MP10
Emission Standard
Emission Standard
2018 , OBD2017 , US17 GHG , US16 , US15 , US13 OBD , US14 GHG
** SOLUTION **
Title (customer effect)
Selective Catalytic Reduction ( SCR ) Efficiency And Diesel Exhaust Fluid ( DEF )
Dosing Valve Diagnostic Trouble Codes ( DTC ) P208E, P103C, P0422, P20EE, P207F,
P225E; Dosing Valve Diagnostic Information TO BE USED BEFORE DEF DOSING
VALVE REPLACEMENT - OBD13 And Newer Emissions (Commonly Model Year
2014 And Newer)
Cause
Codes related to SCR efficiency and the DEF dosing valve may lead to replacement of a
dosing valve that is functioning properly.
Solution
DO NOT REPLACE THE DEF DOSING VALVE FOR ANY
OF THE ABOVE CODES PRIOR TO REVIEWING THE
INFORMATION BELOW
The purpose of this article is to prevent unnecessary component replacement. ALL
OTHER DIAGNOSTIC TESTS AND CHECKS MUST BE PERFORMED when
diagnosing one of the codes above if the tests below do not immediately reveal an
issue.
If an eService case must be submitted, ALL INFORMATION specified in Step
Five MUST be included at the time the case is opened. Cases missing required
information will be Refused.
Overview
During testing of the DEF dosing valve with Guided Diagnostics, certain observations and
normal behaviors of the valve can be mistaken for symptoms of a malfunction. This normally
results in the replacement of a dosing valve that is functioning correctly, leading to no change
in the fault conditions and further diagnosis required or possible return visits in the future. The
information below should be reviewed and the DEF Dosing Valve confirmed to be defective
prior to replacement.
Fault Codes
A complete list of DTCs related to this Solution can be found in the Fault Codes section below.
Information
- Review the Detailed Status Information for the relevant code on the DTC Readout.
• If Confirmed DTC is TRUE: Proceed with diagnostics
• If Confirmed DTC is FALSE: Disregard and focus on other symptoms or DTCs relevant
to the complaint.
1. Minor crystal accumulation at or near the tip of the Dosing Valve is normal.
2. A wet dosing valve tip is normal and does not indicate a leak.
3. When performing Operation 2589-08-03-05 Aftertreatment Selective Catalytic Reduction
(SCR) System Test A - System pressure build up, it is normal to see a small amount of DEF
released from the dosing valve. This occurs because air is bled from the system during pump
start up, and there will be some DEF present with the air in the line as it is pushed out through
the dosing valve.
- During the test, the dosing valve is only open for the bleed operation and is closed when
the pump is maintaining the correct pressure. A continuous spray from the valve at this
time indicates a problem with the valve.
4. When performing Operation 2589-08-03-05 Aftertreatment Selective Catalytic Reduction
(SCR) System Test B - Dosing test, it is very important that the dosing volumes are measured
and recorded accurately. A 250 mL graduated cylinder with 2 mL graduations is the best
instrument for this test.
- Consistent dosing test failure can be justification for DEF dosing valve replacement.
- NOTE: It is rare for this test to fail by exceeding the expected volume.
5. If this solution is being reviewed for P20EE, P207F, P225E or P103C, the NOx Sensor
Diagnostic Solution for the same DTCs should be reviewed for further information.
6. If diagnostic steps do not locate a root cause for the code(s), open an eService case with
Dealer Technical Support
- A complete summary of all tests performed along with numeric measurements, a
DTC Readout, and any information concerning previous visits and parts replaced must
be included when the case is opened.
• "Ok", "Good" and "Followed GD" are not acceptable descriptions of
tests performed and test results.
- Add the solution numbers for all CBR articles followed.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
DEF Dosing , SCR , 1 1 0 EMS , 2 1 0 ACM , Diagnostic tool
Function Group
Function Group
254 catalytic converter; exhaust emission control equipment , 258 emissions aftertreatment
Customer effect
Main customer effect
regeneration , diagnostics/methodology , efficiency/abnormal behavior , fault code
/display
Fluid implicated
AdBlue
Lights/Messages on
information display
Driver's information warning pictogram
Fault code(s)
OBD 2013 Diagnostic
Trouble Codes
P103C , P0422 , P207F , P208E , P20EE , P225E
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
when driving , when stationary
random
Administration
Author
UT0031H
Dealer ID
UT0031H
Last modified by
RU4469V
Creation date
09-04-2018 22:04
Date of last update
25-04-2018 15:04
Review date
01-01-2019 00:01
Status
Published
NA_Reviewer
Nataraj Bhat