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3. Operational Considerations
Please consult the OBDII converter compatibility matrix to
determine what parameters are and are not supported by a
given vehicle. This document can be found at
www.randmcnally.com/OBDII
.
3.1 Odometer
Odometer information is not always directly available from the
OBDII port.
In cases where the odometer information is not directly
available from the OBDII port, the OBDII converter will calculate
the odometer based on vehicle speed. In this case, the odometer
starts at 0 and as a result the odometer value shown in the
Rand McNally Connect web portal will not match the odometer
shown in the vehicle. The odometer value is stored in memory in
the OBDII converter. If the converter is moved to another
vehicle, the odometer value will continue counting where it
left off. There is currently no support to reset the calculated
odometer value.
If the odometer information is available on the OBDII port, then
the odometer value in the Rand McNally Connect web portal
will match the odometer shown in the vehicle.
3.2 Fuel Consumption
Fuel consumption is not an OBDII emissions parameter nor is
it typically available directly from manufacturer parameters
on light duty vehicles. The OBDII converter calculates fuel
consumption using a combination of emissions parameters
on gasoline engines and manufacturer-specific parameters on
diesel engines.
The fuel consumption value starts at 0. The value is stored in
memory in the OBDII converter. If the converter is moved to
another vehicle, the value will continue counting where it left
off. There is currently no support to reset the fuel consumption
value.
3.3 Fault Codes
The OBDII port provides DTC codes that are not compatible with
J1708. Therefore, the TND
™
760 is not able to read any fault
codes from the vehicle when using the OBDII converter.
3.4 Start Up Time
The TND
™
760 powers up automatically when it senses data on
the J1708 or J1939 vehicle interface. The converter box works
the same way, but it takes additional time for the converter box
to initialize and to start sending J1708 messages to the
TND
™
760. If you compare two systems side by side where one
uses the OBDII converter, and the other connects to J1708 or
J1939 data bus directly in a vehicle, the system using the OBDII
converter will take a few additional seconds to turn on.
4. Definitions
Acronym
Definition
OBD
On-Board Diagnostics
Batt
Battery
Gnd
Vehicle Electrical Ground
©2013 Rand McNally. All rights reserved. Specifications are subject to change without notice. Rand McNally endeavors to ensure that the information in this document is correct and fairly
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