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This article describes a method to ensure accuracy when executing diagnostic procedures in an automotive environment.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
69% of the total text.
Page 1 of 1
Data Integrity Method for Automotive Diagnostic Procedures
This article describes a method to ensure accuracy when executing
diagnostic procedures in an automotive environment.
Because of the large variety of automotive engine and body combinations
being serviced in an automotive repair area, a method has been implemented to
ensure data accuracy. A application program in the technician terminal
processor interrogate the vehicle identification number (VIN) and determines the
number of bytes per data record that should be transmitted from the vehicle. The
number of bytes is a known variable dependent on the particular car type. At the
beginning of each data record is a series of nine or more consecutive one bits
called a sync byte. An attachment microprocessor compares the number of bytes
between sync bytes being received from the vehicle with the value transferred
from the technician terminal processor. If there is n match, the repair procedure
is terminated until the proper level of code is input.
In the two VIN numbers shown in the example below, the 1984 Buick and
1985 Chevrolet both use a 5.0 liter engine. However, the implementation by
Buick has 20 data bytes in a record from the engine control module (ECM), and
Chevrolet has 25 data bytes in an ECM record. The technician terminal being
used to diagnose failures in the systems must be able to differentiate between
the two. This is accomplished by reading the tenth number in the VIN number,
looking in a table...