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Diagnosing Electronically Controlled Automatic Transmissions, Exams of Advanced Education

Liberty University (LU)Advanced Education

A comprehensive overview of the diagnostic procedures and common issues associated with electronically controlled automatic transmissions. It covers topics such as identifying the cause of strange noises, diagnosing shifting concerns, performing preliminary tests, and interpreting diagnostic trouble codes. The document also addresses the importance of conducting simple inspections, using scan tools for further clarification, and understanding the relationship between line pressure and transmission performance. By studying this document, readers can gain valuable insights into the diagnosis and repair of electronically controlled automatic transmissions, which are widely used in modern vehicles.

Typology: Exams

2024/2025

Available from 10/08/2024

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ASE - A2 Questions and answers
You are using a diagnostic symptom chart to diagnose an electronically controlled 5-speed automatic
RWD (rear wheel drive) transmission with a strange noise in drive. Technician A says the control valve
could be the cause and is an OFF-vehicle procedure. Technician B says the oil pump assembly could be
the cause and is an OFF-vehicle procedure. Who is right? - Technician B is correct because the oil
pump assembly could be the diagnostic item and is an OFF-vehicle procedure. Technician A is wrong
because the control valve is likely to be the cause in an ON-vehicle procedure, NOT an OFF-vehicle
procedure.
On an electronically controlled 4-speed automatic transaxle, you experience a "shock" when shifting
from "N" to "D." Which of the following will require an OFF-vehicle repair? - The only OFF-vehicle
repair listed for a vehicle that exhibits a shock when shifting from "N" to "D" range is the FORWARD
clutch. All of the other distracters are ON-vehicle repairs.
Preliminary diagnosis on an electronically controlled automatic transmission/transaxle consists of all
the following tests: - Line pressure test, Fluid Check and Stall Test
Technician A says engine, suspension and driveline problems may appear to be caused by the
transmission or transaxle. Technician B says you start with the simple inspections first to ensure that
you have not overlooked something and you can use the scan tool for further clarification. Who is
right? - Both technicians are correct. Tech A is right because many suspension and driveline concerns
and noises may appear to be caused by the transmission or transaxle, when they are caused by the
suspension. For diagnosis, you put the transmission in neutral and see if the concern changes or goes
away. If it goes away, the automatic transmission should be investigated. Tech B is right because you
always do the easy and simple inspections first to make sure that you have not overlooked something
and you can use the scan tool for further clarification
You are checking fluid color on an automatic transmission/transaxle. Which of the following will cause
the fluid to be varnished with a light to dark brown color? - Oxidation from under or overfilling will
cause the fluid to be varnished with a light to dark brown color.
DTC (Diagnostic trouble code) P0705 PNP (park/neutral position) switch circuit is being diagnosed.
Technician A says this code sets when the TCM (Transmission Control Module) or PCM (powertrain
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ASE - A2 Questions and answers

You are using a diagnostic symptom chart to diagnose an electronically controlled 5-speed automatic RWD (rear wheel drive) transmission with a strange noise in drive. Technician A says the control valve could be the cause and is an OFF-vehicle procedure. Technician B says the oil pump assembly could be the cause and is an OFF-vehicle procedure. Who is right? - Technician B is correct because the oil pump assembly could be the diagnostic item and is an OFF-vehicle procedure. Technician A is wrong because the control valve is likely to be the cause in an ON-vehicle procedure, NOT an OFF-vehicle procedure. On an electronically controlled 4-speed automatic transaxle, you experience a "shock" when shifting from "N" to "D." Which of the following will require an OFF-vehicle repair? - The only OFF-vehicle repair listed for a vehicle that exhibits a shock when shifting from "N" to "D" range is the FORWARD clutch. All of the other distracters are ON-vehicle repairs. Preliminary diagnosis on an electronically controlled automatic transmission/transaxle consists of all the following tests: - Line pressure test, Fluid Check and Stall Test Technician A says engine, suspension and driveline problems may appear to be caused by the transmission or transaxle. Technician B says you start with the simple inspections first to ensure that you have not overlooked something and you can use the scan tool for further clarification. Who is right? - Both technicians are correct. Tech A is right because many suspension and driveline concerns and noises may appear to be caused by the transmission or transaxle, when they are caused by the suspension. For diagnosis, you put the transmission in neutral and see if the concern changes or goes away. If it goes away, the automatic transmission should be investigated. Tech B is right because you always do the easy and simple inspections first to make sure that you have not overlooked something and you can use the scan tool for further clarification You are checking fluid color on an automatic transmission/transaxle. Which of the following will cause the fluid to be varnished with a light to dark brown color? - Oxidation from under or overfilling will cause the fluid to be varnished with a light to dark brown color. DTC (Diagnostic trouble code) P0705 PNP (park/neutral position) switch circuit is being diagnosed. Technician A says this code sets when the TCM (Transmission Control Module) or PCM (powertrain

control module) does not receive the correct voltage signal from the park/neutral position (PNP) switch. Technician B says the park/neutral position (PNP) switch circuit could be open or shorted. Who is right? - Both technicians are correct. A because the Diagnostic trouble code sets when the TCM or PCM does not receive the correct voltage signal from the park/neutral position switch. B because the park/neutral position (PNP) switch being open or shorted would also set a DTC. Technician A says low line pressure on an electronically controlled line pressure can cause the transmission to slip and operate sluggishly. Technician B says line pressure varies with engine speed. Who is right? - Technician A is correct because low line pressure can cause the transmission to slip and operate sluggishly. Technician B is wrong because the line pressure should not vary with engine speed. It must remain at a constant level to correctly operate the friction components. It will be lower at idle because of lower RPM as sensed by the TCM or PCM. A line pressure test shows low pressure at idle in all ranges on an electronically controlled automatic transmission. Which of the following can be the cause? - A problem in the oil pump or oil pump pressure regulator will cause low pressure at idle in all gear ranges. Answer option A is wrong because a misadjusted TPS can cause high line pressure at idle not low. B is wrong because a problem with the ATF temperature sensor will cause high line pressure at idle not low. C is wrong because an open in a dropping resistor circuit will cause high line pressure at idle not low pressure. When removing an engine from a vehicle equipped with an automatic transmission, the torque converter does which of the following? - Stays with the transmission All of the following are industry-standard methods used to reprogram the EEPROM: - Remote, direct and off-board programming An automatic transmission pressure test will identify which of the following? - dirty filter will cause lower line pressure and the other choices listed will not.