× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
o
5
4
m
4
b
4
x
4
a
4
l
4
t
4
S
4
m
3
s
3
New Topic  
aantonopoulos aantonopoulos
wrote...
Posts: 38
Rep: 0 0
5 years ago
1. Technician A says that nonemission-related codes that make the malfunction indicator lamp (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. Who is correct?
     
A. Neither Technician A nor B
B. Technician B
C. Technician A
D. Both Technicians A and B

7.   An OBD-II system interprets a disconnected spark plug as a misfire that could damage the three-way catalyst. The ECM or PCM will most likely trigger the malfunction indicator lamp (MIL) on the _______ trip.
     
A. second
B. fourth
C. first
D. third

8.   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. Who is correct?
     
A. Technician B
B. Both Technicians A and B
C. Technician A
D. Neither Technician A nor B
 

9.   All of these concerns can be diagnosed using the paper test except for a
     
A. burned valve.
B. cracked exhaust manifold.
C. bad spark plug wire in the ignition system.
D. faulty injector on a multiport engine.
 

10.   A vehicle fails an HC emission test at idle and 2,500 rpm, and the engine has an acceleration stumble. The heated oxygen sensor (HO2S) voltage is 0.1–0.3 volts on a scan tool, and the injector pulse width is high. No diagnostic trouble codes (DTCs) are found. When propane is directed into the air intake, HO2S voltage immediately increases and the injector pulse width decreases. The most likely cause of this problem is
     
A. a defective powertrain control module (PCM).
B. an opening in the O2 sensor signal wire.
C. a defective O2 sensor.
D. low fuel-pump pressure.

11.   An engine you're servicing has electronically controlled cooling fans. Cooling fan 1 doesn't work but cooling fan 2 does. Which of the following could be the cause?
     
A. Short at circuit 339, pink/black wire
B. Open at ECM Terminal A9
C. Open at ECM Terminal A3
D. Short at circuit 67, light blue wire

12.   The powertrain control module (PCM) or engine control module (ECM) will automatically clear a diagnostic trouble code (DTC) if there are no additional faults detected after
     
A. eighty warm-up cycles.
B. the criteria to clear codes is reached.
C. two consecutive trips.
D. five key-on/key-off cycles.
 

13.   Technician A says that a new replacement part is always good. Technician B says that sometimes recent repair work will be the cause of a complaint. Who is correct?
     
A. Both Technicians A and B
B. Technician B
C. Technician A
D. Neither Technician A nor B

14.   Technician A says that the last step in the diagnostic process is to verify the problem. Technician B says that the second step is to perform a thorough visual inspection. Who is correct?
     
A. Technician B
B. Neither Technician A nor B
C. Technician A
D. Both Technicians A and B

15.   Technician A says that on-board self-diagnostics test mode procedures should be conducted on a cold engine. Technician B says that many diagnostic trouble codes (DTCs) will monitor items only when the engine control system is in closed loop. Who is correct?
     
A. Neither Technician A nor B
B. Technician B
C. Both Technicians A and B
D. Technician A

16.   Technician A says that when the malfunction indicator light (MIL) or service engine light is on, you should retrieve the diagnostic trouble code (DTC) and follow the manufacturer's recommended procedure. Technician B says that all OBD-II monitors must have the enable criteria achieved before a test is performed. Who is correct?
     
A. Technician A
B. Both Technicians A and B
C. Technician B
D. Neither Technician A nor B

17.   What OBD-II term applies when all enabling standards for a specific diagnostic trouble code (DTC) are met?
     
A. Well-tuned engine
B. Warmed-up engine
C. Trip criteria
D. Freeze frame
Read 686 times
8 Replies

Related Topics

Replies
wrote...
Valued Member
Educator
5 years ago
1. Technician A says that nonemission-related codes that make the malfunction indicator lamp (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. Who is correct?
     
A. Neither Technician A nor B
B. Technician B
C. Technician A
D. Both Technicians A and B

Types of DTC's

There are two categories of DTC's that apply to OBDII. They are listed below with Type A being the more severe.

Type A
Emissions related.
Requests illumination of the MIL after one failed driving cycle.
Stores a freeze frame DTC after one failed driving cycle.

Type B
Emissions related.
Sets a Pending Trouble Code after one failed driving cycle.
Clears a Pending Trouble Code after one successful driving cycle.
Turns on the MIL after two consecutive failed driving cycles.
Stores a freeze frame after two consecutive failed driving cycles.
wrote...
Valued Member
Educator
5 years ago
7.   An OBD-II system interprets a disconnected spark plug as a misfire that could damage the three-way catalyst. The ECM or PCM will most likely trigger the malfunction indicator lamp (MIL) on the _______ trip.
     
A. second
B. fourth
C. first
D. third

It is MOST likely that on the first trip a misfire condition can occur that can damage the three way catalyst (TWC) due to overheating. Specific on board diagnostic items will cause the ECM to light up or blink the MIL, and store DTC and Freeze Frame data, even in the 1st trip; e.g., Misfire (Possible three way catalyst damage) -- DTC: P0300 -P0306 will MOST likely set.
wrote...
Valued Member
Educator
5 years ago
8.   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. Who is correct?
     
A. Technician B
B. Both Technicians A and B
C. Technician A
D. Neither Technician A nor B

https://biology-forums.com/index.php?topic=399407.0
wrote...
Valued Member
Educator
5 years ago
9.   All of these concerns can be diagnosed using the paper test except for a
     
A. burned valve.
B. cracked exhaust manifold.
C. bad spark plug wire in the ignition system.
D. faulty injector on a multiport engine.

This information should help
 Attached file 
Thumbnail(s):
You must login or register to gain access to this attachment.
wrote...
Valued Member
Educator
5 years ago
17.   What OBD-II term applies when all enabling standards for a specific diagnostic trouble code (DTC) are met?
     
A. Well-tuned engine
B. Warmed-up engine
C. Trip criteria
D. Freeze frame

Guessing A. Couldn't find information online relating the condition describes with the other terms.
wrote...
Valued Member
Educator
5 years ago
16.   Technician A says that when the malfunction indicator light (MIL) or service engine light is on, you should retrieve the diagnostic trouble code (DTC) and follow the manufacturer's recommended procedure. Technician B says that all OBD-II monitors must have the enable criteria achieved before a test is performed. Who is correct?
     
A. Technician A
B. Both Technicians A and B
C. Technician B
D. Neither Technician A nor B

https://biology-forums.com/index.php?topic=399367.0
wrote...
Valued Member
Educator
5 years ago
15.   Technician A says that on-board self-diagnostics test mode procedures should be conducted on a cold engine. Technician B says that many diagnostic trouble codes (DTCs) will monitor items only when the engine control system is in closed loop. Who is correct?
     
A. Neither Technician A nor B
B. Technician B
C. Both Technicians A and B
D. Technician A

Technician B is correct because many diagnostic trouble codes (DTC) will monitor items only when the engine control system is in closed loop. Closed loop operation requires the engine to reach a certain operating temperature before it can be entered. Technician A is wrong because the on-board self-diagnostics test mode procedures should be conducted on a warm engine (NOT a COLD engine as stated in the question) that is in closed loop because many DTCs only monitor in closed loop.
wrote...
Valued Member
Educator
5 years ago
14.   Technician A says that the last step in the diagnostic process is to verify the problem. Technician B says that the second step is to perform a thorough visual inspection. Who is correct?
     
A. Technician B
B. Neither Technician A nor B
C. Technician A
D. Both Technicians A and B

Answered below.
 Attached file 
Thumbnail(s):
You must login or register to gain access to this attachment.
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  929 People Browsing
Related Images
  
 82
  
 367
  
 227
Your Opinion
Which industry do you think artificial intelligence (AI) will impact the most?
Votes: 308