VEHICLE COMMUNICATION SYSTEM (LATEST) QUESTIONS AND ANSWERS
100% CORRECT
Question 1
Which of the following vehicle architectures utilizes an automatic process to transfer ECU
configuration data when a module is replaced?
A) Atlantis
B) CUSW
C) PowerNet
D) Legacy J1850
E) K-Line
Correct Answer: C) PowerNet
Rationale: PowerNet architecture was designed to streamline module replacement by
automatically transferring vehicle configuration and PROXI data to new ECUs. This
reduces the manual steps required by a technician compared to older or different
architectures like Atlantis, where PROXI alignment must often be initiated manually via a
scan tool.
Question 2
In which vehicle architecture is it typically required to use a manual process within the scan tool
to program the ECU PROXI configuration?
A) PowerNet
B) Atlantis
C) TIPM
D) CAN-FD
E) Automotive Ethernet
Correct Answer: B) Atlantis
Rationale: Unlike the PowerNet system which automates much of the configuration
transfer, the Atlantis architecture (and its derivatives like CUSW) requires the technician
to manually perform a PROXI Alignment procedure using a scan tool (wiTECH) to ensure
all modules on the network share the same configuration and VIN data.
Question 3
What is the standard resistance of the terminating resistor on networks equipped with exactly one
star connector?
A) 120 ohms
B) 100 ohms
C) 60 ohms
D) 40 ohms
E) 10 ohms
Correct Answer: C) 60 ohms
Rationale: In a standard CAN-C network, two 120-ohm resistors are placed in parallel at
opposite ends of the bus to prevent signal reflection, resulting in a total bus resistance of 60
ohms. In architectures using a single star connector for termination, a single 60-ohm
, 2
resistor is often used within that connector to provide the necessary termination for the
entire bus.
Question 4
When measuring a healthy, active CAN-C network with no faults present, what is the expected
voltage range for the CAN-C (-) circuit?
A) 2.6V – 3.5V
B) 0.0V – 0.5V
C) 4.8V – 5.0V
D) 1.3V – 2.3V
E) 7.0V – 10.0V
Correct Answer: D) 1.3V – 2.3V
Rationale: CAN-C is a high-speed differential bus. The CAN-C (-) wire (also known as CAN
Low) operates at a resting state of approximately 2.5V and drops down during
communication. A functional bus will typically show a voltage range between 1.3V and 2.3V
when measured with a multimeter, representing the average of the fluctuating digital
signal.
Question 5
Which of the following vehicles are built on the Atlantis architecture? (Select the most complete
list)
A) Jeep Wrangler (JK), Chrysler Town & Country
B) Jeep Renegade, Jeep Compass, Alfa Giulia, Alfa Stelvio
C) Dodge Dart, Chrysler 200, Jeep Cherokee (KL)
D) RAM 1500 (DS), Dodge Durango
E) Jeep Grand Cherokee (WL), Wagoneer (WS)
Correct Answer: B) Jeep Renegade, Jeep Compass, Alfa Giulia, Alfa Stelvio
Rationale: The Atlantis architecture is a Fiat-derived global architecture. It is the
foundation for the small-wide 4x4 platforms (Renegade/Compass) as well as the Giorgio
platform used for the Alfa Romeo Giulia and Stelvio. The other options list TIPM, CUSW,
or Atlantis-High vehicles.
Question 6
Which specific network in the Atlantis-High architecture utilizes splice block connectors rather
than a star connector?
A) CAN-C
B) CAN-IHS
C) CAN-BH
D) Automotive Ethernet
E) LIN Bus
Correct Answer: C) CAN-BH
, 3
Rationale: In the Atlantis-High architecture (found on vehicles like the WL Grand
Cherokee), the CAN-BH (Body High) bus utilizes splice block connectors. This is a
departure from other high-speed networks that may use star connectors or daisy-chain
configurations, and it is a key identifying feature for physical layer troubleshooting.
Question 7
The "Atlantis-High" architecture and Automotive Ethernet standard 100BASE-TX were first
introduced on which of the following models?
A) 2013 Dodge Dart
B) 2018 Jeep Wrangler (JL)
C) 2021 Jeep Grand Cherokee (WL)
D) 2014 Jeep Cherokee (KL)
E) 2017 Chrysler Pacifica
Correct Answer: C) 2021 Jeep Grand Cherokee (WL)
Rationale: The 2021 Grand Cherokee (WL) marked the introduction of the Atlantis-High
architecture. This system introduced 100BASE-TX Automotive Ethernet, which allows for
much higher data rates (up to 100 Mbps) compared to traditional CAN buses, supporting
advanced features like high-resolution screen mirroring.
Question 8
When troubleshooting an active CAN-B network with no faults, what voltage should be
measured on the CAN-B (+) circuit?
A) 2.6V – 3.5V
B) 4.65V – 4.98V
C) 0.39V – 0.46V
D) 12.0V – 14.4V
E) 1.3V – 2.3V
Correct Answer: C) 0.39V – 0.46V
Rationale: CAN-B is a low-speed, fault-tolerant bus used in older architectures like TIPM.
Unlike CAN-C, which sits at 2.5V, the CAN-B (+) wire sits at a very low voltage
(approximately 0.39V–0.46V) when the bus is active and recessive, while CAN-B (-) sits
near 5V.
Question 9
Which diagnostic tool is required to communicate with and diagnose legacy vehicle architectures
(such as those using J1850 or K-Line)?
A) wiTECH 2.0 with microPOD II only
B) DRB-III or Star Scan / Enhanced DRB-III Emulator
C) DLC Break Out Box only
D) Oscilloscope
E) Sales Code Tool
, 4
Correct Answer: B) DRB-III or Star Scan / Enhanced DRB-III Emulator
Rationale: Legacy Chrysler vehicles (pre-2004/2006) used protocols like J1850 (PCI) and
SCI. These require the original DRB-III hardware or the Enhanced DRB-III Emulator
software used in conjunction with a compatible interface to communicate, as modern
wiTECH systems focus on CAN-based architectures.
Question 10
When checking a Local Interconnect Network (LIN) bus with a Digital Multimeter (DMM)
while the bus is communicating, what is the typical average voltage reading?
A) 0.2V – 0.5V
B) 2.5V constant
C) 7.0V – 10.0V
D) 12.6V constant
E) 1.3V – 2.3V
Correct Answer: C) 7.0V – 10.0V
Rationale: A LIN bus is a single-wire network where the signal swings between battery
voltage (recessive) and ground (dominant). Because a DMM averages these rapid voltage
pulses, a technician will typically see a reading between 7V and 10V DC on a healthy, active
bus.
Question 11
In a TIPM-based architecture, which two components are combined into a single assembly?
A) PCM and TCM
B) BCM and PDC
C) SGW and Radio
D) DLC and Star Connector
E) Cluster and ABS Module
Correct Answer: B) BCM and PDC
Rationale: The Totally Integrated Power Module (TIPM) functions as both the Body
Control Module (BCM) and the Power Distribution Center (PDC). It houses the fuses and
relays while also processing logic for body functions, which was common in vehicles like the
JK Wrangler and RT Minivans.
Question 12
The vehicle configuration data (including VIN and options) is typically saved in which modules?
(Select all that apply)
A) BCM and TIPM
B) PCM and TCM
C) ABS and Airbag
D) Radio and Amp
E) Door Modules only
100% CORRECT
Question 1
Which of the following vehicle architectures utilizes an automatic process to transfer ECU
configuration data when a module is replaced?
A) Atlantis
B) CUSW
C) PowerNet
D) Legacy J1850
E) K-Line
Correct Answer: C) PowerNet
Rationale: PowerNet architecture was designed to streamline module replacement by
automatically transferring vehicle configuration and PROXI data to new ECUs. This
reduces the manual steps required by a technician compared to older or different
architectures like Atlantis, where PROXI alignment must often be initiated manually via a
scan tool.
Question 2
In which vehicle architecture is it typically required to use a manual process within the scan tool
to program the ECU PROXI configuration?
A) PowerNet
B) Atlantis
C) TIPM
D) CAN-FD
E) Automotive Ethernet
Correct Answer: B) Atlantis
Rationale: Unlike the PowerNet system which automates much of the configuration
transfer, the Atlantis architecture (and its derivatives like CUSW) requires the technician
to manually perform a PROXI Alignment procedure using a scan tool (wiTECH) to ensure
all modules on the network share the same configuration and VIN data.
Question 3
What is the standard resistance of the terminating resistor on networks equipped with exactly one
star connector?
A) 120 ohms
B) 100 ohms
C) 60 ohms
D) 40 ohms
E) 10 ohms
Correct Answer: C) 60 ohms
Rationale: In a standard CAN-C network, two 120-ohm resistors are placed in parallel at
opposite ends of the bus to prevent signal reflection, resulting in a total bus resistance of 60
ohms. In architectures using a single star connector for termination, a single 60-ohm
, 2
resistor is often used within that connector to provide the necessary termination for the
entire bus.
Question 4
When measuring a healthy, active CAN-C network with no faults present, what is the expected
voltage range for the CAN-C (-) circuit?
A) 2.6V – 3.5V
B) 0.0V – 0.5V
C) 4.8V – 5.0V
D) 1.3V – 2.3V
E) 7.0V – 10.0V
Correct Answer: D) 1.3V – 2.3V
Rationale: CAN-C is a high-speed differential bus. The CAN-C (-) wire (also known as CAN
Low) operates at a resting state of approximately 2.5V and drops down during
communication. A functional bus will typically show a voltage range between 1.3V and 2.3V
when measured with a multimeter, representing the average of the fluctuating digital
signal.
Question 5
Which of the following vehicles are built on the Atlantis architecture? (Select the most complete
list)
A) Jeep Wrangler (JK), Chrysler Town & Country
B) Jeep Renegade, Jeep Compass, Alfa Giulia, Alfa Stelvio
C) Dodge Dart, Chrysler 200, Jeep Cherokee (KL)
D) RAM 1500 (DS), Dodge Durango
E) Jeep Grand Cherokee (WL), Wagoneer (WS)
Correct Answer: B) Jeep Renegade, Jeep Compass, Alfa Giulia, Alfa Stelvio
Rationale: The Atlantis architecture is a Fiat-derived global architecture. It is the
foundation for the small-wide 4x4 platforms (Renegade/Compass) as well as the Giorgio
platform used for the Alfa Romeo Giulia and Stelvio. The other options list TIPM, CUSW,
or Atlantis-High vehicles.
Question 6
Which specific network in the Atlantis-High architecture utilizes splice block connectors rather
than a star connector?
A) CAN-C
B) CAN-IHS
C) CAN-BH
D) Automotive Ethernet
E) LIN Bus
Correct Answer: C) CAN-BH
, 3
Rationale: In the Atlantis-High architecture (found on vehicles like the WL Grand
Cherokee), the CAN-BH (Body High) bus utilizes splice block connectors. This is a
departure from other high-speed networks that may use star connectors or daisy-chain
configurations, and it is a key identifying feature for physical layer troubleshooting.
Question 7
The "Atlantis-High" architecture and Automotive Ethernet standard 100BASE-TX were first
introduced on which of the following models?
A) 2013 Dodge Dart
B) 2018 Jeep Wrangler (JL)
C) 2021 Jeep Grand Cherokee (WL)
D) 2014 Jeep Cherokee (KL)
E) 2017 Chrysler Pacifica
Correct Answer: C) 2021 Jeep Grand Cherokee (WL)
Rationale: The 2021 Grand Cherokee (WL) marked the introduction of the Atlantis-High
architecture. This system introduced 100BASE-TX Automotive Ethernet, which allows for
much higher data rates (up to 100 Mbps) compared to traditional CAN buses, supporting
advanced features like high-resolution screen mirroring.
Question 8
When troubleshooting an active CAN-B network with no faults, what voltage should be
measured on the CAN-B (+) circuit?
A) 2.6V – 3.5V
B) 4.65V – 4.98V
C) 0.39V – 0.46V
D) 12.0V – 14.4V
E) 1.3V – 2.3V
Correct Answer: C) 0.39V – 0.46V
Rationale: CAN-B is a low-speed, fault-tolerant bus used in older architectures like TIPM.
Unlike CAN-C, which sits at 2.5V, the CAN-B (+) wire sits at a very low voltage
(approximately 0.39V–0.46V) when the bus is active and recessive, while CAN-B (-) sits
near 5V.
Question 9
Which diagnostic tool is required to communicate with and diagnose legacy vehicle architectures
(such as those using J1850 or K-Line)?
A) wiTECH 2.0 with microPOD II only
B) DRB-III or Star Scan / Enhanced DRB-III Emulator
C) DLC Break Out Box only
D) Oscilloscope
E) Sales Code Tool
, 4
Correct Answer: B) DRB-III or Star Scan / Enhanced DRB-III Emulator
Rationale: Legacy Chrysler vehicles (pre-2004/2006) used protocols like J1850 (PCI) and
SCI. These require the original DRB-III hardware or the Enhanced DRB-III Emulator
software used in conjunction with a compatible interface to communicate, as modern
wiTECH systems focus on CAN-based architectures.
Question 10
When checking a Local Interconnect Network (LIN) bus with a Digital Multimeter (DMM)
while the bus is communicating, what is the typical average voltage reading?
A) 0.2V – 0.5V
B) 2.5V constant
C) 7.0V – 10.0V
D) 12.6V constant
E) 1.3V – 2.3V
Correct Answer: C) 7.0V – 10.0V
Rationale: A LIN bus is a single-wire network where the signal swings between battery
voltage (recessive) and ground (dominant). Because a DMM averages these rapid voltage
pulses, a technician will typically see a reading between 7V and 10V DC on a healthy, active
bus.
Question 11
In a TIPM-based architecture, which two components are combined into a single assembly?
A) PCM and TCM
B) BCM and PDC
C) SGW and Radio
D) DLC and Star Connector
E) Cluster and ABS Module
Correct Answer: B) BCM and PDC
Rationale: The Totally Integrated Power Module (TIPM) functions as both the Body
Control Module (BCM) and the Power Distribution Center (PDC). It houses the fuses and
relays while also processing logic for body functions, which was common in vehicles like the
JK Wrangler and RT Minivans.
Question 12
The vehicle configuration data (including VIN and options) is typically saved in which modules?
(Select all that apply)
A) BCM and TIPM
B) PCM and TCM
C) ABS and Airbag
D) Radio and Amp
E) Door Modules only
