K12902414

Solution K12902414
Thursday, May 3, 2018 9:57:15 PM CEST
NA_MACK_Vehicle_Range
NA_MACK_Vehicle_Ran
ge
LR , MRU , Anthem , CHU , CXU , GU , TD
Engine family
Engine family
MP7 , MP8
Emission Standard
Emission Standard
2018 , OBD2017 , US17 GHG
** SOLUTION **
Title (customer effect)
Mack Chassis - Engine Speed Does Not Ramp Up From Body Builder Module Request;
Requests Sent Via Data Link / Body Link Connector, Not By Switch Or Hardwired
Circuit - Generation 2 (INT-GEN2) And Newer (Commonly Model Year 2018)
Cause
For chassis built post face-lift (Generation 2), the engine may not respond to bodybuilder
module commands. This issue occurs when commands sent by bodybuilder modules are
routed through the data link via the Body Link Connector instead of controlled by a
directly wired connection or switch.
This issue occurs due to data link signal priority. Cruise control and engine speed
adjustment are both handled by steering wheel switches, which also broadcasts signals
via data link. The default setting for signal sources gives priority to the steering wheel
switches over any other signal. Because of this, an engine speed change commanded by
a different module would be ignored because the signal was not sent from the steering
wheel switches.
Solution
This solution is applicable ONLY for chassis configured as indicated above. Any
engine speed, PTO, or Cruise Control issues on chassis with other configurations
should be diagnosed with normal procedures.
If the chassis is the correct configuration:
- Run Accessory Kit 85153488
- Program the VECU as needed.
- Check function
Solution visibility
BO only
Function(s)/component(s) affected
Function affected
engagement , PTO , 1 1 0 EMS , 3 1 0 TECU , MID 144 – VECU , MID 249 – BBM
, Diagnostic tool
Function Group
Function Group
27 engine controls , 284 control system, fuel supply , 365 entire vehicle control
system , 48 power take-off , 891 exterior equipment
Customer effect
Main customer effect
engine speed , efficiency/abnormal behavior , stop/start
Conditions
Vehicle operating mode
Frequency of occurrence of
problem
Speed
when activating , when driving , when stationary , engagement , with a PTO
always
<30 km/h
Administration
Author
RU4469V
Dealer ID
RU4469V
Last modified by
RU4469V
Creation date
19-03-2018 17:03
Date of last update
01-05-2018 18:05
Review date
23-04-2018 00:04
Status
Published