Automotive Service Technician (AST)

2012 Guide - Second Period Package (36 Modules) Comments

Date: 9/22/2025 2:44:21 PM
Module: 090201a_2012
Version: 090204bB 2025 copy
Page: 28/30
Comment: Self test question 11 should be answered with C)Closerto the heel, except in the book the answer says D)Closer to the toe
Status: Approved for Review

Date: 9/10/2025 4:02:44 PM
Module: 090201aB
Version: 1st Edition
Page: 76
Comment: Please note that the question is in ILM 090201aB - But the question bank covers 090201aA and 090201aB - 3. The compression ratio of a diesel engine is high enough to cause the air being compressed to be heated to the: a) kindling point of the fuel. b) flash point of the fuel. c) fire point of the fuel. d) boiling point of the fuel. I have noticed that nowhere in the reference material do you use the term "Kindling" yet the correct answer is a) kindling point of the fuel Apparently the term was taught in previous versions. In My Opinion - if the answer uses a term - then the material should support this. Granted I am new to the college but have 50 years experience since I started in the trade - I would have picked the wrong answer based upon the material that was presented. Same set - different question 21. The purpose of the firewall on a liner is to: A. Protect the liner O-rings from excessive heat. B. Act as a combustion seal. *C. Reduce the heat and pressure acting on the head gasket. D. Prevent interference between the block and the liner. In this case the question asks the purpose of the "firewall" - But the term is not used in the material. - One more note The answer key shows 43 answers - but last question is 44 They fall out of sync because you do not have a question 35 - goes from 34 to 36 - this throws off the numbering in the answer key 34. When reconditioning a cylinder bore, you can use a deglazing hone to: a) Remove cylinder wall crosshatch. b) Remove cylinder bore taper. c) Remove cylinder bore out of round. d) Restore cylinder wall crosshatch. 36. The fasteners (cap screws, studs, nuts, washers) used on the exhaust system are often: a) Self-locking with nylon locking inserts. b) Left hand threaded fasteners. c) Retained with cotter pins. d) Heat treated and hardened.
Status: Approved for Review

Date: 8/25/2025 11:00:55 AM
Module: 090201bC
Version: 1st Edition
Page: 30
Comment: What tool can be created to clean ring lands? The word "lands" should be replaced with "grooves"
Status: Approved for Review

Date: 10/30/2025 6:10:29 PM
Module: 090201i
Version: 2025
Page: 847,863,891
Comment: The text states that the major thrust side of the piston is the side contacting the cylinder wall on the power stroke, but the answer key for Activity One, Question Three, the answer key states it is the side of the piston contacting the cylinder wall on the compression stroke.
Status: Approved for Review

Date: 11/10/2025 12:58:10 PM
Module: 090201j
Version: 1st Edition
Page: 4
Comment: Oxygen cylinder Supplies pure oxygen (green tank in Canada) Acetylene cylinder Supplies acetylene fuel gas (red tank) Have to disagree with color of tanks all my sets the Acetylene tanks are black and the Oxygen are red(ish) Talking with the welding trade instructors - they suggest that there is no standard color and teach students to check labels
Status: Approved for Review

Date: 9/22/2025 2:38:19 PM
Module: 090204bB
Version: 2025 edition
Page: 21 and The Final Self Test
Comment: The picture on page 21 is of an axle seal NOT a pinion seal, The Self Test has question 2 as AABC as opposed to ABCD
Status: Approved for Review

Date: 11/6/2025 10:38:46 AM
Module: 090205b
Version: 1st Edition
Page: 39, 80
Comment: Page 39 Objective 4 Activity Question 3 3. When a vehicle is equipped with an additional generator that was installed by an aftermarket installer, what steps should be taken when diagnosing a charging system fault? a) Test the generators together as well as individually to confirm the source of the fault. b) Test the aftermarket generator and wiring first as it is more likely to have electrical faults than the factory charging system. c) Swap the factory generator and the aftermarket generator connections to see if the electrical fault also moves from one electrical system to the other. d) Disengage the aftermarket generator to test the factory charging system, advise the customer to return to the aftermarket installer if the factory charging system has no issues. Page 80 Correct answer 3. d) Disengage the aftermarket generator to test the factory charging system, advise the customer to return to the aftermarket installer if the factory charging system has no issues. I have an issue with this - A simple charging system that was added to a vehicle. In what world should a tech or shop admit defeat and send work out to the "aftermarket installer" A charging system should be basic knowledge. Yes there may be little to no documentation provided with the truck as customers typically do not supply it. But a tech should be able to figure out the system - Charging systems are basic knowledge. (and most systems that are aftermarket will have a website and tech support where information and diagrams can be accessed) I have worked in the trade with techs of all levels and not one of them would suggest throwing up your hands in defeat and sending work out of the shop for a charging system. Specialized tools and knowledge may be required for some work and a shop may not want to invest in specialized repairs, but a charging system is not one of those cases. We are training techs.... Not people that pass the work to someone else Perhaps some automotive transmission overhaul work that requires specialized tools Not an alternator that is not charging. Thanks
Status: Approved for Review


Archived Comments

Year: 2021

6/22/2021 11:46:42 AM
Module: 090201o
Version:
Page:
Comment: The calculation of the increase in boiling point of coolant due to an increase in pressure has some errors. The ILM states that 3.25F is 2C. This is not correct -one degree Celsius is 1.8 times larger than one degree Fahrenheit. This error shows up in the calculation as the final answer calculted in fahrenheit is 257.5F. 257.5F is actually 125.3C not 128C as is calculated using metric. Using 2C is equal to 3.6F, you calculate 212F + (14 *3.6F) = 262.4F. 262.4F is equal to 128C. Also the starting point for the calculation is given at 212F (100C) (the boiling point of water) not sure why that is used rather than 225F (107C) given for a 50/50 mix on pg 7. The calculation is the for the boiling point elevation of coolant, not water.
Status: Implemented

6/22/2021 11:11:06 AM
Module: 090202b
Version:
Page: 1
Comment: Objective one for manual TRANSMISSIONS states "Describe the purpose, operation and construction of a manual TRANSAXLE and and its components."
Status: Implemented

6/22/2021 11:05:52 AM
Module: 090201g
Version:
Page: 26
Comment: It states that a cam follower is a second class lever because the fulcrum is at the end rather than the middle. However the placement of the effort (cam) and load (valve spring) are not considered. A second class lever has the load in the middle and the effort at the end opposite the fulcrum. This gives allows a smaller effort force moving over a large distance to move a heavy load a small distance (like a wheelbarrow). In the case of the cam follower, the fulcum is an one end, the effort (action of the cam) is in the middle and the load (valve spring to be compressed) is at the other end. This makes the cam follower a third class lever. In a third class lever, the load travels farther than the effort which correlates to valve lift being greater than cam lift (rocker ratio).
Status: Implemented

6/22/2021 10:32:25 AM
Module: 090201m
Version:
Page: 14
Comment: The paragraph that begins with "Inspect all exhaust system heat shields..." below figure 16 is identical to the paragraph higher up on the page (one paragraph above figure 16)
Status: Implemented

5/13/2021 9:49:17 AM
Module: 090204c
Version:
Page:
Comment: Self-Test Question 6 asks which gears are used on remote final drive assemblies; this topic is not covered in the module.
Status: Declined

Year: 2020

4/17/2020 10:38:55 AM
Module: 090205c
Version:
Page:
Comment: I have had student come out of the AIT exam totally confused asking me "what is multiplexing?" as there is a question on the exam about multiplexing. There is currently no mention of multiplexing in the 1st or 2nd period modules. It was in the older 2nd period material. I believe that we need to add a paragraph or two as an overview of multiplexing to this module.
Status: Declined

1/6/2020 9:35:05 AM
Module: 090202a
Version: 21
Page: 31
Comment: Figure 34 is missing
Status: Implemented

Year: 2019

12/5/2019 1:25:57 PM
Module: 090201e
Version: 21
Page: 38
Comment: Answers for question #3 are incorrect. The picture was changed in the last revision, but the answers were not changed to match the new picture.
Status: Implemented

12/5/2019 1:23:13 PM
Module: 090201i
Version: 21
Page: 17
Comment: Figure 17 is incorrect. The picture is NOT an impeller wheel. (It is a differential drive pinion)
Status: Implemented

12/2/2019 8:45:56 AM
Module: 090201d
Version: 21
Page: 23
Comment: Answer to question #5 is incorrect. It states that bearings matched to the crankshaft should be oversized. This is incorrect. The bearings needed are undersized due to the inside diameter. The bearings now form a smaller diameter which makes them undersized. The bearing manufactures will identify this on the back of the bearing with a mark like this - 0.010us. The correct answer should be A
Status: Implemented

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