Question

1. OBD-ii systems use several modes of operation

list three of them.
2. list the four ways that individual components
can be checked.
3. true or false? a bad ground can cause an increase in the reference voltage to a sensor.
4. a typical normal oxygen sensor signal will toggle between ______ and _______ volts.

Answer 1

OBD-II has several modes with three being retrieval of current data, stored diagnostic trouble codes, and clearing of these codes. Components can be checked visually, electrically, functionally, and with pressure tests. A bad ground often decreases voltage, not increases it. Normal oxygen sensors fluctuate between 0.1 and 0.9 volts.

Step-by-step explanation:

The On-Board Diagnostics system version II (OBD-II) has several modes of operation, three of which are:

Mode 1 - Retrieves current data, such as sensor readings and status of systems.

Mode 3 - Retrieves stored diagnostic trouble codes.

Mode 4 - Clears diagnostic trouble codes and stored values.

Individual components in an automotive system can be checked in several ways, the four main methods include:

Visual Inspection - Checking for physical damage or corrosion.

Electrical Testing - Using a multimeter to check for correct voltages and resistances.

Functional Tests - Activating components via a scan tool to ensure proper operation.

Pressure Tests - Checking for correct fluid pressures in systems like hydraulics or fuel.

True or False: A bad ground can cause an increase in the reference voltage to a sensor is false. A bad ground typically causes a decrease in voltage, leading to erratic sensor behavior.

A typical normal oxygen sensor signal will toggle between 0.1 and 0.9 volts as it measures the oxygen content in the exhaust gases to optimize the air-fuel mixture.