IK0800119 Service Bulletin/Repair Instructions

IK0800119 ­ Post 2007 Suspension Dump on ProStar and NGV
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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
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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
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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)
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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
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Copyright © 2014 Navistar, Inc.
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11/3/2014

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