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INTERFACE MODULE AND VHMS CHECKOUT & TROUBLESHOOTING
GENERAL
The center of the Vehicle Health Monitoring System
(VHMS) is the VHMS controller which gathers data
about the operation of the truck from sensors and
other controllers installed on the truck. Refer to Fig-
ure 13-1 for an overview of the VHMS system com-
ponents.
For instructions on how to use VHMS software pro-
grams, refer to VHMS Software elsewhere in this
section.
Structure and Purpose
This checkout procedure is in two parts. The first part
verifies that the interface module, is in good working
condition. The second part verifies the VHMS con-
troller operation and also reviews the settings for
accuracy.
D13004
FIGURE 13-1. VHMS SYSTEM
VHMS CHECK-OUT & TROUBLESHOOTING
The interface module should already have the appli-
cation code installed. If not, refer to the VHMS Soft-
ware procedures for "Installing Application Code Into
Interface Module."
The following areas are covered in this checkout pro-
cedure.
• Interface Module Checkout
• VHMS Controller Checkout
• Orbcomm Controller
• Troubleshooting
• Fault Code Tables
• Fault Tree Analysis
D13-3
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