IK0800119 ­ Post 2007 Suspension Dump on ProStar and NGV

Page 1 of 3

Countries:

CANADA, COLOMBIA, UNITED STATES,
MEXICO, PUERTO RICO

Document
ID:

IK0800119

Availability:

ISIS, Bus ISIS, FleetISIS

Revision:

4

Major System:
Current
Language:

ELECTRICAL SYSTEM

Created:
Last
Modified:

12/14/2007

English

Other
Languages:

Français, Español,

Viewed:

8137

Author:

10/23/2014
Al
Schnellenberger

Less Info
Coding Information

Hide Details

Copy Link

Copy Relative Link

Bookmark

Add to Favorites

Print

Provide Feedback

View My Bookmarks

Helpful

Not Helpful

1440

1571

Title : Post 2007 Suspension Dump on ProStar and NGV
Applies To : Post 2007 ProStar and NHPV with Suspension Dump 595ACA or 595BBC

CHANGE LOG
7/31/2014 - Added Change Log
7/31/2014 - Added references for 595BBC
7/31/2014 - Added Warranty Claim Coding Block




DESCRIPTION
This feature allows the operator to lower the rear of the vehicle by dumping the air from the suspension bags, or raise the rear of the vehicle to the
set point controlled by the suspension height control valve.
This feature consists of the following components:
•
•
•
•

Suspension dump switch (2 position latching)
Suspension dump switch indicator light
2 (normally open) air solenoids
Shuttle valve (2 position latching)

The suspension dump switch is located in a switch pack. The switch pack location and switch assignment varies depending on the vehicle
configuration. The suspension dump air solenoids can be located in any air solenoid 4-pack depending on the vehicle configuration. However,
both solenoids will reside in the same 4-pack. Refer to Diamond Logic® Builder (DLB) for switch pack switch assignment and body controller air
solenoid pin assignment for a particular vehicle.
The switch pack sends a request message on the appropriate data link to the body controller to dump or raise the suspension depending on the
switch position. The body controller provides near battery voltage to energize the appropriate air solenoid. The air solenoids, within the air
solenoid 4-pack, share a common ground.
The shuttle valve installs directly into the two adjacent air solenoids. The shuttle valve traps air pressure in the air line to the suspension height
control valve to keep the suspension dumped, or blocks air pressure in the air line to the suspension height control valve to keep the suspension
inflated.
Dump Suspension
When requesting suspension DUMP the operator is requesting the body controller to release air from the air suspension. The system applies air
pressure to the dump control line port of the suspension height control valve mounted above the rear axle. The Body Controller will control the
air solenoids to dump the suspension when:
•
•
•
•
•
•
•

The key switch is in the IGNITION position.
AND the suspension dump switch is moved to the DUMP position.
AND the suspension dump switch has a good status.
AND the vehicle speed is less than or equal to 5 MPH, with 595ACA, or the programmed Maximum Vehicle Speed, with 595BBC.
AND the vehicle speed has a good status.
AND both solenoid A and B have a good status.
AND an open circuit condition was not present for solenoid A during this key cycle.

When the body controller commands the Dump Suspension operation:
• Solenoid A will be de-energized (open).
• AND solenoid B will be energized (closed).

Air pressure is then passed from solenoid A through the delivery port of the latching valve to the suspension height control valve dump port, which keeps
the suspension deflated.

Raise Suspension

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlI...

11/3/2014

IK0800119 ­ Post 2007 Suspension Dump on ProStar and NGV

Page 2 of 3

When requesting suspension SUSP the operator is requesting the air suspension to be supplied with air pressure (or remain supplied). The body
controller will control the air solenoids to raise the suspension when the suspension dump solenoid A has a good status AND:
• [The vehicle speed is greater than 5 MPH AND the vehicle speed has a good status]
• OR [the key switch is in the IGNITION position AND the suspension dump switch is moved to the SUSP position AND the suspension dump

switch has a good status]
When the Body Controller commands the Raise Suspension operation:
• Solenoid A will be energized (closed)
• AND solenoid B will be de-energized (open)

Then shuttle valve then moves to block the air supply from going to the suspension height control valve dump port and the air will flow out around
the exhaust shield of the latching shuttle valve, which allows the suspension to rise.
SIGNALS TO WATCH

POSSIBLE DIAGNOSTIC TROUBLE CODES
DTC
17472
1755­
5
1755­
6
1756­
5
1756­
6

MODULE
Body
Controller
Body
Controller
Body
Controller
Body
Controller
Body
Controller

DESCRIPTION
Suspension Dump Switch Error
Suspension Dump Solenoid B Relay Under Current Or Open
Circuit
Suspension Dump Solenoid B Relay Over Current
Suspension Dump Solenoid A Relay Under Current Or Open
Circuit
Suspension Dump Solenoid A Relay Over Current

TROUBLESHOOTING
1.
2.
3.
4.

Check for Diagnostic Trouble Codes (DTC's) in the Body Controller.
Check for ignition and accessory voltage.
Make sure that there is at least 100psi in the air tanks.
Is the light in the switch flashing fast or slow:
A. Slow Flash (1 time per second) - This indicates that the interlocks below have not been met:
i. The key switch is in the IGNITION position OR the vehicle speed is greater than 5 MPH.
ii. AND the suspension dump switch has a good status
iii. AND both air solenoids have a good status
iv. AND an open circuit condition was not present on either suspension dump solenoid this ignition cycle.
v. AND [both suspension dump solenoids are de-energized OR (the vehicle speed has a good status AND the suspension dump
switch is in the DUMP position AND the body controller has controlled the solenoids to raise the suspension.)]
B. Flash Fast (2 times per second) - This indicates that there is an error condition such as:
i. The suspension dump switch has a bad status
ii. OR the suspension dump solenoid A has a bad status
iii. OR the suspension dump solenoid B has a bad status
iv. OR an open circuit condition was present for solenoid (A or B) this ignition cycle.
v. OR (the suspension dump switch is in the DUMP position AND the vehicle speed has a bad status)

PARTS INFORMATION
• Click here for the Bodybuilders Quick Reference
• Diamond Logic Body Integration Quick Reference Parts Guide (This is a very good parts guide with pictures)

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlI...

11/3/2014

IK0800119 ­ Post 2007 Suspension Dump on ProStar and NGV

Page 3 of 3

CIRCUIT DIAGRAMS
Master Service Information Page
WARRANTY INFORMATION
Warranty Claim Coding:
Group:

08960

Noun:

065 Solenoid Unit, Pneumatic Accessory

Hide Details

Feedback Information
Viewed:

8136

Helpful:

1440

Not Helpful: 1571
No Feedback Found

Copyright © 2014 Navistar, Inc.

https://evalue.internationaldelivers.com/service_kb/DocTool/ArticleViewer.aspx?ControlI...

11/3/2014