Solution K58557784
Tuesday, March 6, 2018 10:14:58 PM CET

Solution
Title (customer effect)

Fuel Injector Offset Learning Diagnostic Trouble Codes ( DTC ) / Fault Codes Logged
In Engine Control Module ( EMS ); Possible Rough / Uneven Idle - OBD15 Chassis

Cause

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.

Solution

Overview
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
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.

Relevant DTCs
The list of all applicable DTCs for this issue is included in the Fault Codes section below.

Repair
If any of the fault codes in the section below are set on an OBD15 engine:

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

20-02-2018 21:02

Review date

10-12-2018 00:12

Status

Published

NA_Reviewer

UT0455H

NA_Author_Group

GTT

NA_MACK_Vehicle_Range
NA_MACK_Vehicle_Ran
ge

Cabover , Conventional

NA_VOLVO_Vehicle_Range
NA_VOLVO_Vehicle_Ra
nge

Engine family

Conventional

Engine family

Volvo , Mack

Emission Standard
Emission Standard

US15