Exam 1: The Diagnostic Process

The steps in a manufacturer-specific diagnostic routine are being discussed. Technician A says that after recording any DTCs, the codes should be erased. Technician B says to road test the vehicle twice to turn off the MIL. Which technician is correct?

Technician A says that a standard spark plug can be used to check proper ignition system voltage. Technician B says that the energy required to jump the gap of a spark tester is around 3000 volts. Which technician is correct?

Which of these is the LEAST desired method for clearing DTCs?

Technician A says to check coolant level in the radiator when it is hot. Technician B says to check coolant level in the radiator when it is cool. Which technician is correct?

Technician A says that a symptom may be corrected without correcting the cause of the problem. Technician B says that verifying the repair will determine if the root cause of the problem has been repaired. Which technician is correct?

What fault could occur that can cause a driveability issue and not set a diagnostic trouble code (DTC)?

Technician A assumes a replacement part is good just because it is new. Technician B says that sometimes recent repair work will be the cause of a complaint. Which technician is correct?

When should DTCs be cleared?

A type ________ DTC is set if an emission problem may cause damage to the catalytic converter.

A generic (global)-type scan tool can retrieve ________ data.

Technician A says that it is a good idea to perform a test drive before attempting repairs. Technician B says that its a good idea to let the customer accompany the technician on the test drive. Which technician is correct?

Technician A says that water floats to the top of fuel in the tank. Technician B says that water is more likely to be drawn into the system when the fuel level is low. Which technician is correct?

Technician A uses a scan tool to clear stored DTCs. Technician B says that clearing DTCs will also clear all of the noncontinuous OBD-II monitors. Which technician is correct?

Technician A says that non-emission related codes that make the MIL illuminate are called "Type A" codes. Technician B says that emission related codes that illuminate the MIL after the first fault are called "Type A" codes. Which technician is correct?

A freeze frame is stored when a type ________ DTC is set.

How many steps does the book outline for a systematic diagnostic procedure?

A drive cycle is designed to reset all the OBD-II monitors. Before starting the drive cycle the engine should be ________.

Technician A says that most TSBs involve a specific stored DTC. Technician B says that the ECT and IAT reading should be close to the same temperature after the vehicle sits for several hours. Which technician is correct?

Technician A says that a vehicle may have stored DTCs even if the MIL is not illuminated. Technician B says that all DTCs will illuminate the MIL. Which technician is correct?

Technician A says that generic scan tools must be able to read all generic OBD-II codes. Technician B says that all generic scan tools must be able to read manufacturer OBD-II trouble codes. Which technician is correct?