K58557784

Solution K58557784
Thursday, June 7, 2018 8:22:42 PM CEST
Mack Models
Mack Model
LR , LEU , MRU , CHU , CXU , GU , TD
Volvo Models
Volvo Model
VNX , VNL , VNM , VHD , VAH
Engine family
Engine family
11L Engine , 13L Engine , 16L Engine , MP7 , MP8 , MP10
Emission Standard
Emission Standard
US15
** SOLUTION **
Title
Fuel Injector Offset Learning Diagnostic Trouble Codes ( DTC ) / Fault Codes Logged
In Engine Control Module ( EMS ); Possible Rough / Uneven Idle - US14+OBD15
Emissions, Commonly Model Year 2016
Cause
US14+OBD15 chassis may set codes for injector offset learning minimum and
maximum values. The codes may be accompanied by rough idle, with no other
performance complaints or symptoms of injector failure.
Cylinder balancing is only active at idle speeds, between 500 and 750 RPM. The
balancing monitor does not run outside of this speed range, which means the codes do
not set under high idle or driving conditions. Offset codes generated with no other
injector-related codes and no symptoms aside from a possible rough idle may not
indicate a physical injector problem, and diagnosing the codes will in many cases lead to
no fault found. It has been determined that software may contribute to the problem.
Software improvements have been implemented to better control cylinder balancing
logic.
Solution
Relevant DTCs
The list of all applicable DTCs for this issue is included in the Fault Codes section below.
Repair
- Verify the chassis emissions level and ensure that the vehicle is within the
applicable range for this solution.
- Details can be found in the Product Details box on the Product tab in PTT as seen
below:
If any of the fault codes in the section below are logged in a US14+OBD15 chassis:
A. Check the EMS Main Software (MSW) part number.
- If the EMS MSW part number is lower than 23167877.P01:
1. Update the EMS software
2. Reset Cylinder Balance from Premium Tech Tool (PTT) Operation 2387-0803-01 Cylinder Balancing, located in the Test tab.
3. Run a Cylinder Balance test from the same screen following the reset. Start
the test at minimum temperature (140 °F, 60 °C) and monitor balancing until
coolant temperature reaches approximately 177 °F (81 °C). This will allow
observation of performance during multiple engine modes that are entered during
warm-up.
4. If the Cylinder Balance test still shows an issue and/or there are one or more
Learning Offset codes that return following the update, follow Guided
Diagnostics for the applicable code or codes.
- If the EMS MSW is part number 23167877.P01 or newer, proceed with Guided
Diagnostics for the applicable code or codes.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
injectors , regulation (cruise control/engine speed) , 1 1 0 EMS
Function Group
Function Group
23 fuel system, excluding gas propulsion , 284 control system, fuel supply
Customer effect
Main customer effect
calibration/programming/pairing/missing operation , efficiency/abnormal behavior , faul
t code/display
Fluid implicated
fuel
Fault code(s)
OBD 2013 Diagnostic
P02CC00 , P02CD00 , P02CE00 , P02CF00 , P02D000 , P02D100 , P02D200 , P02
Trouble Codes
D300 , P02D400 , P02D500 , P02D600 , P02D700 , P101200 , P101400 , P102300
, P102500 , P102700 , P102900
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
Engine speed
when stationary
random
500 - 1000 rpm
Administration
Author
UT0455H
Dealer ID
UT0455H
Last modified by
RU4469V
Creation date
29-01-2018 19:01
Date of last update
14-05-2018 22:05
Review date
10-12-2018 00:12
Status
Published
Average score
0.5
Number of scores
2
NA_Reviewer
UT0455H
NA_Author_Group
GTT