On Board Diagnostic Quiz

Technician A says that both OBD I and OBD II systems will pinpoint a sensor that is operating poorly or incorrectly. Technician B says that OBD I will only indicate that a circuit is no longer operating properly. Who is correct?

The malfunction indicator light in an OBD II system is flashing. Technician A says that this simply indicates a soft failure. Technician B says this means the problem could be damaging the catalytic converter. Who is right?

Technician A says an automotive computer can scan its input and output circuits to detect incorrect voltage problems. Technician B says an automotive computer can scan its input and output circuits to detect an incorrect resistance problem. Who is right?

Unplugging the computer harness connector with the engine running could cause a computer-damaging ______________________________.

An OBD II system will identify problems with all the components listed except ____.

Trouble codes set by an OBD I system can be read manually by each of the following methods except ____.

The data link connector for an OBD II system most often will be located ____.

The number 1 appearing as the first digit in an OBD II trouble code indicates that the trouble code is ____.

A trouble code indicates that there is no activity in an oxygen sensor circuit. Technician A says to test the sensor and its circuit. Technician B says to replace the sensor. Who is right?

A wiggle test is being performed on an automotive computer system. Technician A performs this test with the engine off and the ignition key off. Technician B performs this test with the engine off and the ignition key on. Who is right?