K16925952

Solution K16925952
Tuesday, March 5, 2019 5:21:48 PM CET
Mack Models
Mack Model
LEU , LR , MRU - TerraPro , CHU - Pinnacle, Axle back , CXU - Pinnacle, Axle front
, GU - Granite , TD - Titan
Volvo Models
Volvo Model
VNL , VNM , VNX , VAH , VHD
Engine family
Engine family
11L Engine , 13L Engine , 16L Engine , MP7 , MP8 , MP10
Emission Standard
Emission Standard
US10+OBD13 , US14 , US14+OBD15 , US14+OBD16 , US14 CNG , US17
** SOLUTION **
Title
** Tech Tip ** TT - 007 - 2015 - Diagnosing The Aftertreatment Control Module DTCs
P202D, P208E, P20E8 - OBD13 (Commonly Model Year 2014); Newer Chassis AFTER
Reviewing Other Solutions
Cause
Chassis is logging the following fault codes intermittently with a potential No Fault
Found using Guided Diagnostics ( GD ). These may cause illumination of the MIL lamp.
P208E and P20E8 may be accompanied by Inducement / P1000. One or more of these
faults may be logged together. The causes not covered in GD are bad electrical
connections ( FCUT ) reporting low DEF pressure, or contamination in the system
causing actual low pressure.
Solution
This solution should only be used for initial checks for OBD13 chassis. For all newer chassis,
this solution should not be followed unless the other solutions pertaining to the correct
emission level have been followed first with no fault found.
1. Inspect the electrical circuit connections between the ACM and the DEF pump at the
DEF pump connector, ACM connector, and FCUT connector. Pay special attention to the
FCUT connector. A minor amount of oxidation or corrosion will cause these DTCs.
If any corrosion is found in the FCUT connector, replace terminals on the front chassis
harness and urea tank harness as required.
2. Inspect DEF system for contamination and clean as required. Debris can build up in the
filter screens under normal operation and remain trapped in the system due to the reversion
cycle at key off.
NOTE: If at any point a failure is found the root should should be diagnosed from that point.
No further step should be completed until the problem has been verified.
Remove all of the DEF fluid lines and flush out with compressed air and water.
Remove the Inlet and backflow connectors and inspect the filter screens for debris and
replace as required. Reference Impact 2589-11-02-05 Aftertreatment Diesel Exhaust Fluid
(DEF) Contamination Flush
Remove the level sensor / sending unit from the DEF tank. If contamination is found in the
tank, the pickup filter must be replaced with the latest
updated part number in Impact. The
tank must be completely flushed.
When re-priming the system with fresh DEF, remove the fluid connector from the DEF doser
and place into a container, start the engine and allow a small amount of fresh fluid to purge.
Verify that the DEF line connectors have a secure seal on the tube ends when reconnecting
the lines.
3. If the above actions do not resolve the complaint, proceed with the applicable Guided
Diagnostics. Terminal Corrosion example: FCUT connector Debris found in DEF pump
connector screens
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
1 1 0 EMS , 2 1 0 ACM , Urea control unit , Diagnostic tool , Documentation , TT
, exhaust , DEF Dosing , DPF , SCR
Function Group
Function Group
254 catalytic converter; exhaust emission control equipment , 258 emissions aftertreatment
Customer effect
Main customer effect
diagnostics/methodology , efficiency/abnormal behavior , fault code/display
Fluid problem
contamination
Fluid implicated
AdBlue
Fault code(s)
OBDII Diagnostic Trouble
Codes (2013- )
P1000 , P208E-00 , P20E8
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
when driving , when stationary
always
Administration
Author
A241298
Last modified by
A241298
Creation date
17-01-2017 17:01
Date of last update
11-02-2019 17:02
Status
Published
Average score
0
Number of scores
1