High speed CAN uses only CAN high signal wires.
Low speed CAN has a CAN high signal wire.
If a single module is not communicating on a CAN network, what is the best first step?
Verify power and ground for that module
Install the breakout box to Gateway and view the module's waveform with the DSO
Inspect for marten bites
Verify an LED test light flickers when back-probing another CAN module
In a CAN or LIN network that has no fault, the signal is the same throughout the network, no matter where it is viewed.
Where do modules get their power and ground for communication?
From Gateway (J533)
Power from the Gateway (J533), and ground through its housing
Ground through the Gateway (J533), and power from their individual wiring harnesses
Power and ground through their individual wiring harnesses
What is true about LIN (Local Interconnect Network)?
It allows a CAN (LIN master) module to control and receive information from modules that are not on a CAN network
It allows a LIN (slave) module to wake up a CAN module
It is one of the fastest networks that exist
It is not used anymore
CAN and LIN communication is best described as:
Electrical current used as a language between modules
Voltage as a language between modules
It is a form of PFM
Electrical resistance as a language
How do high speed CAN signals differ from low speed CAN signals?
Where am I?
High speed CAN's CAN low signal always gets pulled high
Low speed CAN's CAN high signal always gets pulled low
The dominant and recessive voltage amplitudes are different
Why are CAN high and low signal wires twisted together?
Martens are unable to bite a single wire
It's easier to identify the matched set during repairs
Any electrical interference will affect them equally keeping differential voltages valid
So each wire can detect the messages sent the opposite direction
If low speed CAN has an open circuit in one of its wires, what will happen?
The control modules will still function normally, but have faults for single wire mode
The control modules will only partially function, but have faults for single wire mode
No faults will set because it's a fault-tolerant system
No communication is possible because it's not a fault-tolerant system
When should bandwidth limitation (BWL) be off?
for low frequency signals
for high frequency signals
the start of diagnosis
my day off
When should a multimeter be used to evaluate the quality of network communication signals?
When it's a misdiagnosis or comeback
When power and ground have been verified at all modules
When you've given up
What type of signal is displayed?
Local Interconnect Network (LIN) uses a single wire for communication.
If a CAN module does not have power at it's individual wiring harness connector, what will the network signal look like at that same connector?
It will be 0V, no matter which network
It will be approximately recessive voltage for it's type of network
It will be a normal waveform for the type of network protocol used
It will default to source voltage
If there is an open circuit between a CAN master module and one of it's LIN components, what will the network signal look like at that LIN component?
It will be 0V
It will be continuous source voltage
It will be continuous recessive voltage
It will appear like a normal LIN network signal
What is the most likely cause of the displayed waveforms?
Bandwidth Limitation is turned on
Bandwidth Limitation is turned off
There is a short between the low-speed and high-speed CAN
There is a short between the high-speed and low-speed CAN
In a MOST network, what is meant by "attenuation"?
The attention level of each module
The reduction in light intensity
The interference of electromagnetism
The interference of short-wave radio signals
If you cannot communicate with a single module on a network, what is the best next step?
Connect the DSO at the component and evaluate the network signal
Connect the breakout box and evaluate the network with a DSO
Connect the breakout box and evaluate the network with a DVOM
Check power and ground at that module