K38445549

Solution K38445549
Thursday, January 4, 2018 5:26:18 PM CET
Solution
Title (customer effect)
Volvo Chassis - Logging Diagnostic Trouble Code ( DTC ) P026D - Fuel Injection
Quantity Higher Than Expected - US15 Emissions, Model Year ( MY ) 2016
Cause
P026D00 - Fuel Injection Quantity Higher Than Expected may log on a US15 emissions
level chassis with no fault found at the conclusion of Guided Diagnostics.
Solution
Overview
The Engine Control Module ( EMS ) monitors fuel/air mixture via the NOx sensors.
P026D is logged by the EMS when the oxygen level detected by the NOx sensors is too
low when compared to the fuel flow rate.
In addition to the items covered in Guided Diagnostics, boost reading, fuel injectors, and
EGR flow can cause this code to set.
Repair
If Guided Diagnostics results in No Fault Found or Unclear Test Results:
• Inspect the Intake Manifold Pressure (Boost Pressure) sensor
- Verify that the sensor is reading correctly
The sensor value should be zero with key on, engine off
- Verify that the correct sensor is installed
Sensor part numbers differ depending on engine emissions level. An
incorrect sensor will provide the wrong pressure value.
• Check the EGR Differential Pressure ( Delta-P) Sensor
- In addition to verifying that the sensor and Venturi Tube are not clogged, the
sensor value should be verified to be zero with key on, engine off
• Physically verify that the EGR valve is operating correctly
- There should be no more than a trickle of flow out of the valve when it is closed
-The valve should be verified to move through its full range without binding at
any point in travel
• Verify that the correct injectors are installed
- This is especially relevant for chassis that have just had the injectors replaced.
Injectors intended for a larger displacement engine will dose an excessive
amount of fuel
- Part numbers should be visually verified from the injector tags
• Confirm that the turbocharger is functioning correctly
- The VGT Function Test located in Premium Tech Tool ( PTT ) should be used
to verify function
- Review the CBR Solution for the VGT Function Test for more information and
test result interpretation
• Ensure that there are no leaks in the intake system
- Review the CBR solution for smoke testing intake and exhaust systems as
necessary
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
fuel system , exhaust , Diagnostic tool
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
P026D
Administration
Author
a175606
Last modified by
RU4469V
Creation date
08-04-2016 15:04
Date of last update
18-12-2017 17:12
Status
Published
NA_VOLVO_Vehicle_Range
NA_VOLVO_Vehicle_Ra
nge
Conventional , VNX , VNL , VNM , VHD , VAH
Engine family
Engine family
Volvo , 11L Engine , 13L Engine , 16L Engine
Emission Standard
Emission Standard
US15