Silverado 1500 2WD V8-4.8L VIN V (2006)
Information Bus: Testing and Inspection
Scan Tool Does Not Communicate with Class 2 Device
SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE
CIRCUIT DESCRIPTION
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information
and commands are exchanged among the modules. Connecting a scan tool to the data link connector (DLC) allows communication with the modules
for diagnostic purposes.
DIAGNOSTIC AIDS
The engine will not start when there is a total loss of class 2 serial data communication while the ignition is OFF. The following conditions will cause
a total loss of class 2 serial data communication:
-
A class 2 serial data circuit shorted to ground.
-
A class 2 serial data circuit shorted to voltage.
-
An internal condition within a module or connector on the class 2 serial data circuit, that causes a short to voltage or ground to the class 2 serial
data circuit.
TEST DESCRIPTION