NHTSA ID Number: 10199373
Manufacturer Communication Number: SS2083FTL2021
TSB/Document Date: 2021-07-22
Summary
Service Solution for Aero Height Control Interfering with RDF Alignment and 42/523004/13 and 232/524042/9 Active for vehicles equipped with Hadley Smart Valve. The Aerodynamic Height Control feature on the New Cascadia is a feature that raises and lowers the air suspension with relation to vehicle speed in order to reduce drag and achieve better fuel efficiency. The Hadley Smart Valve (HSV) is the module that makes this possible by applying and exhausting air from the rear axle suspension as necessary.
7/16/2021
SS 3083 Aero Height Control Interfering with RDF A... - DTNA Solutions
DTNA Solutions Service Solutions Freightliner
SS 3083 Aero Height Control Interfering with RDF A...
SS 3083 Aero Height Control Interfering with RDF
Alignment and 42/523004/13 and 232/524042/9
Active
Applicable Vehicles:
Freightliner New Cascadia equipped with Hadley Smart Valve
Western Star 49X equipped with Hadley Smart Valve
Symptoms:
Unit is specified from factory with a Hadley Smart Valve (HSV)
This can determined by navigating to subgroup/module 87D in PartsPro or Excelerator
and look at the wiring schematics to see if there is a Hadley Smart Valve included in the
wiring.
Adaptive Cruise control inop/intermittent
RDF will not run through EOL calibration
The following codes are active:
42-RDF/523004/13 - ECU not alligned
232-VRDU/524042/9 - ECU RDF timeout
Issue:
The Aerodynamic Height Control feature on the New Cascadia is a feature that raises and lowers
the air suspension with relation to vehicle speed in order to reduce drag and achieve better fuel
efficiency. The Hadley Smart Valve (HSV) is the module that makes this possible by applying and
exhausting air from the rear axle suspension as necessary.
The Frontend Radar (RDF) when aligned needs to maintain a stable height relative to the ground
when performing calibration. The HSV lowering and raising the air suspension interferes with this
positioning and thus interferes with the calibration leading to calibration failures.
Solution:
Connect to the server in DiagnosticLink (If this is not done, parameters will not be editable)
Find the parameter in the RDF titled ‘Chassis Leveling System Available On Axle’
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SS 3083 Aero Height Control Interfering with RDF A... - DTNA Solutions
Take note of what the parameter is set to.
Disable the ‘Chassis Leveling System Available On Axle’ by setting it to ‘no leveling available’
Run the radar alignment in Actions > Detroit Assurance > Radar Calibration. See New
Cascadia Workshop Manual section 54.11.100 for further details.
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Whether or not the alignment was successful, revert ‘Chassis Leveling System Available On
Axle’ parameter back to how it was originally configured.
If the alignment was unsuccessful, see TS 382 to investigate possible issues further.
The radar should now be aligned and the fault codes should go inactive.
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TSB/Document ID: SS2083FTL2021
Replacement Service Bulletin Number:
MFR Communication Date: 2021-07-16
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: SUSPENSION
MFR Component System:
MFR Component Subsystem:
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