K65527708

Solution K65527708
Friday, May 3, 2019 4:32:44 PM CEST
** SOLUTION **
Title
Diagnostic Trouble Codes (DTC) P20EE And P103C, Diagnostic Procedure; REPLACE
S GUIDED DIAGNOSTICS IN PREMIUM TECH TOOL ( PTT ) - US17+OBD16 And
Newer Chassis ONLY
Mack Models
LR , MRU - TerraPro , TE - TerraPro , AN - Anthem , CHU - Pinnacle, Axle back , C
Mack Model
XU - Pinnacle, Axle front , GR - Granite , GU - Granite , PI - Pinnacle
Volvo Models
VNL , VNM , VNR , VAH , VHD
Volvo Model
Emission Standard
Emission Standard
US17+OBD16 , US17+OBD18 , US17+OBD19
Engine family
Engine family
11L Engine , 13L Engine , MP7 , MP8
** SOLUTION **
Cause
Procedures and checks to follow for P20EE and P103C on US17 and newer
chassis.
Solution
If this solution is being reviewed for P225E-00, solution K15560422 must be utilized FIRS
T, and this solution should only be followed if the NOx sensors are determined to be
functioning properly. The tests performed in K15560422 do not need to be duplicated for
this solution.
The following checklist should be used for diagnosis of P20EE or P103C on
GHG17 chassis instead of Guided Diagnostics.
DO NOT REPLACE ANY PARTS UNTIL ALL ACTIVITIES LISTED IN THIS CBR ARE
COMPLETE.
NOTE: The Malfunction Indicator Lamp ( MIL ) may still be lit even if P20EE shows inactive on a
DTC Readout.
I. Vehicle History
- The following information should be obtained prior to beginning diagnosis.
• Is this the chassis's first visit to the dealer for either of these codes?
• Have there been any previous failures or problems that may have caused problems with the
Exhaust Aftertreatment System (EATS)?
Examples:
- Turbocharger failure
- EGR Cooler failure
- Coolant passage through the exhaust
- Excessive fuel through the exhaust (Injector failure, AHI failure)
- DPF failure
- Contaminated DEF
NOTE: If this is the chassis's first visit for either code, a Sulfur Regeneration should be
performed and the chassis released after confirming the items below.
II. Check the DTC Readout
- Are there any other NOx sensor DTCs present?
• P225E and P0422 are very similar to P20EE and should be checked with the same steps below.
• Any other NOx sensor codes may suggest intermittent NOx sensor failure.
- Are there any codes present for other engine components that would indicate an issue
contributing to or causing either P20EE or P103C?
• Examples:
EGR System
Fuel System ( Includes AHI)
Turbocharger/Boost
DPF
Exhaust temperature
III. Check SCR Efficiency Evaluations
- SCR Efficiency values can be found in Premium Tech Tool ( PTT ) Operation 2589-08-03-05
Aftertreatment Selective Catalytic Reduction (SCR) System.
• The last five efficiency evaluations are displayed as shown in the screenshot above.
If all five tests are below the fault limit, SCR conversion has been poor for an extended
amount of time.
If only one or two are below the fault limit, conversion is only intermittently poor.
- Information on driving conditions when the poor conversion is occurring may provide
insight into the cause of the codes.
IV. SCR System Checks
All steps below should be performed to verify proper function of each component.
1. Check DEF quality with a refractometer
2. Physically check for any contamination in the DEF tank
• Examples
- Dirt or Debris
- Coolant
- Water
- Fuel
- Oil
3. Physically inspect the DEF Dosing Valve, Diffuser Pipe, and SCR Inlet for crystallized DEF
• Ensure there is no significant/excessive crystal buildup in any component.
NOTE: A small amount of crystal accumulation is normal.
• If significant accumulation is noted clean it as first step and then ensure that the DEF dosing
valve is correctly installed with all gaskets and clamps positioned properly.
4. Perform DEF Dosing Test 2 to confirm proper function
• Located in Operation 2589-08-03-05 Aftertreatment Selective Catalytic Reduction (SCR) System.
Test B from the first screen of the operation
• Test two is the Small Dosing Test
The test should be run twice and results noted to an accuracy of 2 milliliters
Nominal Volume is 55 mL
Acceptable range is 55 mL ± 3 mL
5. Run a NOx Conversion, Operation 2549-08-03-03.
• Note: This test checks the function of both NOx sensors. It does not evaluate SCR efficiency.
• While running NOx convrsion test, if any new NOx sensor codes are logged (Egs: P220E-93,
P220F-93), make sure to troubleshoot those codes.
• Inlet and Outlet NOx Sensor values should be close to each other at high engine speed (last
portion of the test) as shown below.
If during the test difference between NOx sensors are greater than 10%, we recommend replacing
sensor reading higher value and re-do the test.
The likelihood that both sensors require replacement at once is low. Replacement of both sensors at
once should not be considered immediately unless affected by an upstream failure.
V. eService Case
If further assistance is required or tests determine a likely SCR failure, an eService case needs to
be opened, the case MUST INCLUDE:
1. The vehicle history as described in Section I.
2. A complete DTC Readout from the time of the vehicle's arrival.
3. Screenshots of:
• SCR Efficiency values as shown in Section III
• The NOx Conversion Test as shown in the picture in Section IV.
4. A description of findings for each item checked in Section IV, including numerical values for the
dosing tests ("Good", "Okay", "In spec", etc. are not acceptable values).
5. Once approval has been received refer to CBR solution K05618059 for an up to date P/N list.
Internal comments (BO)
For GHG 2017 and 2018 cases with P20EE (and /or P103C) evaluate following 6 items:
1. SCR efficiency looks bad (all 5 evaluations hovering around or lower than 80%)
2. NOx conversion just before shutdown looks good (Both NOx sensors are within
10% of each other and values between 200-500ppm). When in doubt replace
sensor reading higher value (higher by atleast 10%).
3. DEF quality inspection is good
4. Dosing flow test is good (52-58cc)
5. No other relevant fault codes (EGR system, fuel system)
6. Prior visit got Sulfur regeneration completed and truck is back within 2 weeks
for same issue or Truck has P103C (SCR inducement code).
If all 6 of the above items are OK, we are OK with replacing SCR (2 Box). Only
vehicles having P103C or customers who decides to park the vehicle when MIL is ON
(for P20EE) would be considered as requiring one box replacement for Mack vehicles
(due to parts shortage of one box mack). Please make sure to collect all the data as per
checklist prior to recommending SCR replacement.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
Diagnostic tool , SCR , DEF Dosing
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
Diesel Exhaust Fluid (DEF)
Lights/Messages on
information display
Engine equipment fault warning pictogram
Fault code(s)
OBDII Diagnostic Trouble
Codes (2013- )
P0422-00 , P103C , P20EE-00 , P225E-00
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
05-06-2018 17:06
Date of last update
25-04-2019 21:04
Review date
01-10-2018 00:10
Status
Published
Average score
3.75
Number of scores
4
NA_Reviewer
ut0031h
NA_Author_Group
GTT