K83329291

Solution K83329291
Thursday, December 6, 2018 8:44:02 PM CET
Mack Models
Mack Model
PI-Pinnacle , AN-Anthem
Volvo Models
Volvo Model
VNR , VNL
Engine family
Engine family
13L Engine , MP8
Emission Standard
Emission Standard
US17 , US17+OBD18 , OBD2017 , 2018
** SOLUTION **
Title
EXPIRED - Refer to Solution K42766159 - Turbo Compound - Customer Report Of
Excessive Air Purging Or Air Compressor Cycling With Vehicle At Idle; Acceptable
Secondary Air System Leakdown Time Frame During Extended Idle - US17+OBD16
And Newer Emissions, Common Model Year 2018 And Newer
Cause
For vehicles equipped with turbo compound, air from the buffer air valve is used to
pressurize the turbo compound rear seal while the engine is at idle to prevent oil leakage.
This causes a very gradual drop in air pressure in the secondary air system, resulting in
more frequent cycling of the air compressor and air purge.
Solution
Secondary Air System pressure will normally drop approximately 20 psi over six
minutes of idling.
No action is required if the air compressor is cycling a minimum of approximately
every 5-6 minutes. This is considered normal.
Solution visibility
Dealer distribution
Function(s)/component(s) affected
Function affected
air supply
Function Group
Function Group
2551 Turbocharger
Conditions
Vehicle operating mode
when stationary
Administration
Author
UT9246H
Dealer ID
UT9246H
Last modified by
RU4469V
Creation date
24-09-2018 17:09
Date of last update
07-11-2018 17:11
Status
Expired