Session 6 OBD review 1

The MIL is turned off under any of the following conditions, EXCEPT ________.

• Vehicle is driven on 3 consecutive trips with a warm-up cycle, without detecting a fault

• PCM diagnostic link is grounded

• Power to the PCM is disconnected

• Codes are cleared with a scan tool

Which code was to be diagnosed first on OBD 1 systems?

• PROM

• O2 Sensor

• Too lean 

• Too rich

How long does it take for a historical DTC to 'age out'?

• 75 key cycles

• 255 key cycles

• 40 key cycles

• 25 key cycles

To turn off a permanent DTC the confirmed fault free monitoring cycles must be?

• Consecutive

• Consequential

• Intermittent

• Completed

A fault is generated when a PZEV vehicle exceeds the EPA emissions standards by how much?

• 1.5 times

• 2.5 times

• 5 times

• 3.5 times

When can historical DTCs be checked?

• When active codes are present

• When no active codes are present

• When ODDTCs are present

• When CMDTCs are present

How many different ways can a permanent DTC be cleared?

• 1

• 2

• 3

• 4

Manufacturers are allowed to program their own proprietary functionality into the PCM.

• True

• False

Which of the following are faults stored in a module when a fault is detected that remain there even if the fault no longer exists?

• CMDTCs

• Circuit codes

• On-Demand DTCs

• Rationality checks

How many pins does an OBD 2 DLC connector have?

• 14

• 16

• 15

• 12