Solution K65527708
Friday, July 26, 2019 7:21:49 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

Mack Model LR, MRU - TerraPro, TE - TerraPro, AN - Anthem , CHU - Pinnacle, Axle back , C

XU - Pinnacle, Axle front , GR - Granite , GU - Granite , PI - Pinnacle

Volvo Models

Volvo Model

VNL, VNM, VNR, VAH, VHD

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 PZOEE and P103C on US17 and newer
chassis.

omen /\ WARNING

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
GHGI17 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 Truck MY2020 (OBD2019) first or repeat visit for
P20EE, please create an E-service case to get support from Tech
Support prior to doing any additional inspections.

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 P2QEE 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

iI. 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.
Product ProductHistory Diagnose Test Calibrate Program Impact

DTC P20EE or P103C
Test Values - NOx/SCR Monitor Data

2589-08-03-05 Aftertreatment selective catalytic reduction (SCR) system

>> Execution

80 % Minimum fault limit

2 Yo Evaluation (Most recent)

Action

Read parameters

Evaluation

Evaluation 2
scRe

Th

73 Evaluation 3 Five most recent ie more than 90%
- 90%, adiional diagnosis may
PEL Cl]
73% Evaluation 4 7 c vi en
een evaluated alter the DTCs are cleared or
76% Evaluation (Oldest)
ES Note: In onde 8 Ine SCR @Mciency test values, The vehicle may Nave to be driven in loaded condition:
fot approximately 1 -2 hours
DTC P207F Test result
Test Values - DEF Dilution Monitor Data Select one of nemat

74 Minireuin faailt fienit

Chapsi ID: M763 17321 VIN: 1M2AVOAGAJMOTTS2) Work Order: 47238

¢ 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. Check the Main Software part number for the Engine Control Module (EMS)

* Make a note of the number. It will be used in the next step.

6. Run a NOx Conversion, Operation 2549-08-03-03.

Z\ WARNING

Read all of the parts of this step prior to performing
the test to prevent repeated steps.

This test checks the function of both NOx sensors. It d
oes not evaluate SCR efficiency.

¢ While running NOx conversion 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%, it is recommended to

replace the sensor reading the 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.

Product Product History Diagnose Test Calibrate Program Impact
* 4 Crank the engine continuously until the po)

NOx Conversion Test

“After engine cranking has been completed, the
a «, operation has completely finished"
=
! " ©. note: “The engine must be cranked within 4

cranking is not done within this time period, the

* NOx-in and NOx-out levels vs. Engine speed
~ Current test status
2,000

4.000 {2,000
3.760
a.s00 71.750 1,750
3,250 1

3.000 {1,600 J
2.750
2.500 {1,260 |

* NOx-in and NOx-out levels vs. Engine speed

347 ppm NOx Outlet
1762 rpm Engine speed

2.000 44,000

260
Exhaust gas temperatures

7 — 7 le aay eo
15.67 15.75 15.83 15.92 16.0 16.08 iterTeN equal 16.5 16.58
o | air | u Extaustten

[7] NOx Inlet [ppm] = (i) NOx Outlet
we me = = [7] Engine speed | ser | T2 Exhaust ten
S
=_Exhaustnas temperatures x 389 °F T3 Exhaust ten

* If the vehicle has EMS Software Part Number 23470183 or 23470187: Refer to the comments

below:

EMS Main Software Part Numbers 23470183 and 23470187, used for US17+OBD18
emissions, has a bug that allows DEF dosing to continue during the NOx conversion test. This

causes continued low Outlet NOx sensor values as seen in the screen shot below and prevents
the desired behavior shown above.

Product ProductHistory Diagnose Test Calibrate Program Impact

NOx Conversion Test

*y od

VJ

Maidcom VBC Remote

* NOx-in and NOx-out levels vs. Engine speed
4,000 }2,000

3,760
3,500 {1,750 ||

3,000 {4,500

2,600 41,250 4|

2,000 41,000. 7|

1,600 | 750 ||

1,000 } 600

fee
spo | 260 ~~.

280 ee ee ee ee

16.08
[min]