ADT Network Communication & CAN Bus Systems 3

Question 1

For which type of application was FlexRay introduced into Audi vehicles?

Accepted Answer

Safety-critical and time-deterministic functions such as active chassis control and steer-by-wire

Answer

Low-cost entertainment streaming

Answer

Keyless entry and tire pressure monitoring

Answer

Climate control and seat adjustment

Question 2

What maximum data rate does FlexRay achieve on each channel compared to standard high-speed CAN?

Accepted Answer

FlexRay reaches up to 10 Mbps per channel

Answer

FlexRay is slower at 125 kbps per channel

Answer

FlexRay matches CAN at 500 kbps per channel

Answer

FlexRay operates at 1 Mbps, the same as CAN FD

Question 3

Which automotive Ethernet standard is used in modern Audi vehicles to transmit high-bandwidth data such as camera and radar sensor streams over a single unshielded twisted pair?

Accepted Answer

100BASE-T1 (BroadR-Reach / OPEN Alliance Single Pair Ethernet)

Answer

10BASE-T (standard Ethernet)

Answer

1000BASE-TX (Gigabit Ethernet)

Answer

Wi-Fi 802.11ac

Question 4

In ODIS, which diagnostic function performs an automatic scan of all network-connected control modules and displays their stored fault codes in a single report?

Accepted Answer

Vehicle self-diagnosis (auto-scan)

Answer

Guided fault finding

Answer

Basic settings

Answer

Adaptation channel adjustment

Question 5

Fault code U0100 is stored in several control modules of an Audi. What does U0100 specifically indicate?

Accepted Answer

Lost communication with the Engine Control Module (ECM/ECU)

Answer

CAN High wire shorted to chassis ground

Answer

Control module supply voltage below threshold

Answer

Internal memory failure in the storing module

Question 6

How does CAN FD (CAN with Flexible Data Rate) improve upon classical CAN in Audi's newer vehicle architectures?

Accepted Answer

It supports data rates up to 8 Mbps in the data phase and data frames up to 64 bytes

Answer

It replaces copper wiring with fiber optic cable

Answer

It operates at the same 500 kbps but adds encryption

Answer

It eliminates the need for termination resistors

Question 7

When probing an active CAN bus with an oscilloscope, which waveform pattern confirms healthy network communication on a high-speed CAN circuit?

Accepted Answer

CAN High shows complementary square waves between 2.5V and 3.5V while CAN Low mirrors them between 1.5V and 2.5V

Answer

Both CAN High and CAN Low sit at a steady 2.5V DC with no variation

Answer

A single sine wave oscillating between 0V and 5V on CAN High only

Answer

A 50% duty-cycle PWM signal on CAN High with CAN Low grounded