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2.2 Diagnostic protocol standards J1708 / J1587 / J1939
•
SAE J1587
SAE J1587 is an automotive diagnostic protocol standard developed by the Society of Automotive
Engineers (SAE) for heavy-duty and most medium-duty vehicles built after 1985. The J1587 protocol
uses different diagnostic connectors. Up to 1995, the individual OEMs used their own connectors.
From 1996 to 2001, the 6-pin German-connector was standard. Beginning in 2001, most OEMs
converted to the 9-pin German. Some OEMs still use the 6-pin German. It has mostly been used US
made vehicles, and also by Volvo. SAE J1707 makes up the physical and data link layers while SAE
J1587 makes up the transport and application layers with respect to the OSI model. SAE J1587 is
used in conjunction with J1708 for automobile communication.
•
SAE J1939
SAE J1939 is the vehicle bus standard used for communication and diagnostics among vehicle
compents, originally by the car and heavy duty truck industry in the United States. SAE J1939 is used
in the commercial vehicle area for communication throughou the vehicle. With a different physical
layer it is used between the tractor and trailer. This is specified in ISO11992. SAE J1939 can be
considered the replacement for the older SAE J1708 and SAE J1578 specifications. SAE J1939 is
used in the commercial vehicle area for communication throughou the vehicle. With a different
physical layer it is used between the tractor and trailer. This is specified in ISO11992. SAE J1939 can
be considered the replacement for the older SAE J1708 and SAE J1578 specifications. AEA J1939
has beeb adopted widely by diesel engine manufacturers. One driving force behind this is th
increasing adoption of the engine Electronic Control Unit (ECU), which provides one method of
controlling exhaust gas emissions within US and European standards. Consequently, SAE J1939 can
now be found in a range of diesel-power applications: vehicles (on-and off-road), marine propulsion,
power generation and industrial pumping. Applications of J1939 now include off-highway, truck, bus,
and even some passenger car applications.
3. USING THE SCAN TOOL
3.1 Tool Description
1
LCD DISPLAY
Indicates test results.
2
ENTER BUTTON
Confirms a selection (or action) from a menu.
3
ESC BUTTON
Returns to previous menu.
4
UP BUTTON
Move cursor up for selection.
5
DOWN BUTTON
Move cursor down for selection.
6
LEFT BUTTON
Move cursor left for selection;
or turn page when more than one page is displayed.
7
RIGHT BUTTON
Move cursor right for selection;
or turn page when more than one page is displayed.
8
USB PORT /
Connects to computer to update the AUTO SCANNER online.
9
Cable with OBD II CONNECTOR
Connects the AUTO SCANNER to the vehicle.
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