ASE4 OBD II and Scan Tool Diagnostics

Question 1

What does MIL stand for in OBD II diagnostics?

Accepted Answer

Malfunction Indicator Lamp

Answer

Main Ignition Load

Answer

Module Interface Line

Answer

Multiple Input Linkage

Question 2

How many consecutive trips with the same fault detected does OBD II typically require before illuminating the MIL?

Accepted Answer

Two trips

Answer

One trip

Answer

Three trips

Answer

Four trips

Question 3

What information is captured in OBD II freeze frame data?

Accepted Answer

A snapshot of engine operating conditions at the moment a DTC was set

Answer

Factory engine calibration data from the ECM

Answer

Real-time live data from all currently monitored sensors

Answer

Historical fuel economy data from the last 10 drive cycles

Question 4

What is the standard OBD II communication protocol required in most vehicles manufactured since 2008?

Accepted Answer

CAN (ISO 15765-4)

Answer

ISO 9141-2

Answer

J1850 VPW

Answer

J1850 PWM

Question 5

What does an 'incomplete' readiness monitor status on a scan tool indicate?

Accepted Answer

The specific OBD II self-test for that system has not yet run and completed

Answer

The vehicle battery voltage is too low to complete the test

Answer

The sensor for that system has failed and must be replaced

Answer

The ECM memory has been corrupted and needs reprogramming

Question 6

A DTC with the prefix 'P0' indicates what type of fault code?

Accepted Answer

Generic (SAE-standardized) powertrain fault

Answer

Manufacturer-specific powertrain fault

Answer

Generic body control fault

Answer

Chassis or drivetrain fault

Question 7

What is the primary purpose of performing an OBD II drive cycle after a repair?

Accepted Answer

To allow all readiness monitors to run and complete so emissions compliance can be verified

Answer

To test the vehicle's fuel economy under EPA-standardized conditions

Answer

To calibrate the transmission shift points to factory specifications

Answer

To reset the adaptive memory in the ECM after battery disconnection