K84061935

Solution K84061935
Monday, February 4, 2019 5:59:40 PM CET
Mack Models
Mack Model
Cabover , LEU , LR , MRU - TerraPro , Conventional , CHU - Pinnacle, Axle back ,
CXU - Pinnacle, Axle front , GU - Granite , TD - Titan
Engine family
Engine family
Volvo , 11L Engine , 13L Engine , 16L Engine
Emission Standard
Emission Standard
US15
** SOLUTION **
Title
Mack Chassis - Diagnsotic Trouble Code P026D-00, Fuel Injection Quantity Higher
Than Expected; Diagnosis And Information - US14+OBD15 Emissions, Model Year
2016
Cause
Mack Trucks has received concerns from the field on US15 chassis' logging code P026D
/ P026D00 Fuel Injection Quantity Higher Than Expected with no fault found at the
conclusion of Guided Diagnostics.
Solution
P026D / P026D00 indicates the exhaust has too little oxygen detected by the Nox
sensors versus fuel rate. Incorrect or failed boost sensors, incorrect injectors, or EGR
system failures, may all cause this code. If no fault found at the conclusion of guided
diagnostics, ensure the correct part number boost sensor and injectors are installed.
Verify boost and EGR delta P, are reading zero key on, engine off. Physically verify the
EGR valve is not hanging in travel or bypassing when commanded closed. If still no
fault found, road test the unit briefly and compile a datalog of engine sensors and check
for excessively high boost pressures in the log. The sensor monitoring template and
instructions (entitled "READ FIRST; TT 2.4 - Steps to Import a Template") can be
found here.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
Diagnostic tool , fuel system , exhaust
Function Group
Function Group
237 injector and delivery pipe , 255 turbocharger , 258 emissions after-treatment
Customer effect
Main customer effect
diagnostics/methodology , fault code/display
Fluid implicated
fuel
Fault code(s)
OBD 2013 Diagnostic
Trouble Codes
Administration
P026D
Author
a175606
Last modified by
RU4469V
Creation date
20-04-2016 15:04
Date of last update
01-02-2019 14:02
Status
Published