3. Diagnostics Applications
11
3. Diagnostics Applications
3.1. Test Startup and Vehicle
Connection
3.1.1. Step 1: Connect the Cable
The method used to connect the scan tool to a
vehicle’s DLC depends on the vehicle’s
configuration as follows:
A vehicle equipped with an On Board
Diagnostics Two (OBD II) vehicle
management system supplies both
communication and 12-volt power through a
standardized J-1962 data link connection
(DLC).
A vehicle not equipped with an OBD II
system supplies communication through a
DLC connection and sometimes supplies
12-volt power through the cigarette lighter
receptacle or a connection to the battery.
a. OBD II Vehicle Cable Connection
This type of connection generally requires the
15-pin main cable and an OBD II adapter. To
connect the 15-pin main cable, please follow these
steps:
Locate the required OBD II adapter and
connect it into the 15-pin male connector of
the main cable.
Figure 3.1: OBD II Adapter Connection
to the DB15 Main Cable
Connect the cable’s 15-pin female adapter to
the DB 15-pin port on the top of the scan tool.
Finger tighten the connecting screws.
Figure 3.2: Main Cable Connection
to the Scan Tool
NOTE: Extension cable can be used between
the scan tool and the 15-pin main cable.
Connect the cable’s OBD II adapter into the
vehicle’s DLC, located under the vehicle
dash.
Figure 3.3: OBD II Cable Connection
to Vehicle DLC
