11.82
CONTROLLER AREA NETWORK (CAN)
OVERVIEW
This vehicle uses a Controller Area Network (CAN) to
perform some functions. Similar to a computer network,
CAN establishes a communication network between the
ECM and several on-board components.
The CAN network includes:
• ECM
• Instrument Cluster
• Digital Wrench Diagnostic Plug
• Electronic Power Steering (EPS models only)
NOTE
DO NOT SPLICE OR CUT INTO THE CAN YELLOW
OR GREEN WIRE CIRCUITS.
CAN TROUBLESHOOTING
No CAN functionality can be indicated by the following
items not working on the instrument cluster:
• No engine speed displayed
• No vehicle speed displayed
• No gear position displayed
• Odometer / Tripmeters not working
• Reverse override button does not toggle between
display modes
• ECM-monitored inputs are not displayed when DTCs
or problems exist, i.e. check engine LED, engine
overheat LED, etc.
• There is power at the Smart Link connector, but it
cannot connect to Digital Wrench
To test the CAN circuit, turn the ignition key to OFF, and
then use a multimeter to verify there is 60 +/- 10 ohms
between the CAN High (YELLOW) and CAN Low
(GREEN) wires on the diagnostic connector.
If 120 ohms is measured at the connector, there is a
break somewhere within the CAN circuit.
ELECTRICAL
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