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6/1/22, 11:38 AM
Article
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(Back Office Only) Volvo Chassis - Equipped With A
Catalyzed Exhaust Aftertreatment System ( EATS )
- Regeneration ( Regen ) Failure Diagnostic Process
- US07 to US16 Emissions
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Internal Content
The regen process itself has been mostly unchanged from the time it
was implemented for US07 emissions to present. The Engine ECU
raises engine load to generate exhaust heat, and a Seventh Injector
adds fuel to the exhaust to raise temperatures further and convert
uncombusted particulate material in the Diesel Particulate Filter ( DPF
) to ash. However, with the addition of the Selective Catalytic
Reduction System ( SCR ), the temperatures and engine parameter
values changed, and there have been component changes to the
system as well to improve regen function.
The first version of the EATS was used on chassis built from 2006 (The
beginning of US07 emissions) through mid-2011 (early US10
emissions). The second version was instituted at that time and is used
up until US16 emissions.
Chassis constructed between May 16 and November 14, 2011 were
equipped with the new EATS configuration but also utilized a
Discharge Return Valve ( Compressor Bypass Valve ) ( DRV, CBV ) on
the turbo when initially put into service. Software advancement
eliminated the need for the DRV. In the event that the DRV is
malfunctioning or damaged ( leaking ) on a chassis built in this date
range, a deletion kit can be installed in its place. The procedure can
be found in Technical Service Bulletin V-258-029 located in Impact.
1. Navigate to the Service tab.
2. In the Info Type box, make sure Technical Service Bulletins is selected.
3. In the Additional search values box select Keyword
4. Enter 258-029 into the text entry box, press the Search button.
5. A link for the article will be shown in the results. Click on the title, then
choose one of the options from the window that opens.
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US07 and Early US10 Emissions chassis use a Discharge Return
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Valve ( DRV ) to raise engine outlet temperature. There is no
Aftertreatment Hydrocarbon Injector ( AHI ) module on these chassis.
Instead, there is a separate fuel shutoff valve, and the dosing valve is
located on the Seventh Injector itself. Purge air is routed directly to
the Injector. Fuel and Air enter the Dosing Valve via a Parker© TCheck valve.
Further information and diagnostic instructions for US07 and Early
US10 emissions can be found here.
US10+6 and Newer Emissions chassis utilized an updated version of
the EATS. Engine heat is now produced utilizing higher boost and fuel
injection, eliminating the need for a DRV. AHI components were
redesigned. The Fuel Shut-off Valve and the Dosing Valve were
relocated to a new AHI Module, and a Purge Air Shut-off Valve was
added to the system, also located in the AHI module. The Seventh
Injector itself was changed from a solenoid valve to a simple nozzle.
Further information and diagnostic instructions for US10+6 and
Newer Emissions can be found here.
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Related links and attachments
TSB 258-029-V
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