automatic transmission section 2 test: CH 4, 5, 6
Which of the following statements about electrical problems is NOT true? A short will cause the components in the circuit to operate poorly because of increased current flow to them. Excessive resistance at a connector, internally in a component, or within a wire will cause low current flow, and the component will not be able to operate normally, if at all. In an open circuit, there will be no current flow. If there is an opening in one leg of a parallel circuit, the remaining part of that parallel circuit will operate normally.
A short will cause the components in the circuit to operate poorly because of increased current flow to them.
Technician A says that in a vane-type pump, the vane ring contains several sliding vanes that seal against a slide mounted in the pump housing. Technician B says vane-type pumps are variable- displacement pumps whose output can be reduced when high fluid volumes are not necessary. Who is correct?
Both
Overrunning clutches are capable of _______________.
Braking a member of a planetary gearset
Voltage generation devices are typically used to monitor rotational speeds. Which of the following is NOT a voltage-generating type sensor?
MAP
Which of the following statements is NOT TRUE? The transmission pump is the main source of fluid flow in a transmission. A torque converter uses hydraulic fluid flow to connect and disconnect the power of the engine to and from the transmission. The transmission pump is driven by the input shaft. The valve body contains the valves and orifices that control the operation of a transmission
The transmission pump is driven by the input shaft.
Which of the following will cause a vibration from the transmission or transaxle?
a poorly mounted torque converter
An output shaft or final drive endplay check should be made on either a transmission or transaxle. Technician A says this is done to provide long gear life and to eliminate engagement "clunk." Technician B says endplay should be measured during teardown, which helps obtain the shims necessary to correct undesired endplay. Who is correct?
both
Technician A says a Simpson gearset is two planetary gearsets that share a common sun gear. Technician B says a Ravigneaux gearset has two sun gears, two sets of planet gears, and a common ring gear. Who is correct?
both
Technician A says a ballooned torque converter can cause damage to the oil pump. Technician B says a ballooned torque converter is caused by excessive pressure in the torque converter. Who is correct?
both
Technician A says a converter that has a tight fit at the pilot hub could hold the converter drive hub and inner gear too far into the pump, causing cover scoring. Technician B says a front pump bushing that has too much clearance may allow the gears to run off center, causing them to wear into the crescent or the sides of the pump body. Who is correct?
both
Technician A says a cooler located in the radiator can be replaced by a radiator shop if necessary. Technician B says if an external cooler is plugged it may make sense to replace it. Who is correct? Note: Radiator transmission cores were replaceable on older vehicles with copper/ brass radiators. Most all vehicles today have aluminum core with plastic end caps and are not serviceable. The complete radiator is replaced if the transmission cooler core has issues. Some current manufacturers use transmission cores that have very small openings inside and cannot effectively be flushed. Technician A is correct if it is an older copper/ brass core. Technician B is correct if it is one of the modern cores with the smaller internal openings. So answer Both A and B.
both
Technician A says a faulty output shaft can cause vibrations. Technician B says an unbalanced torque converter can cause vibrations. Who is correct?
both
Technician A says a multiple-disc clutch can be used to drive a planetary member. Technician B says a multiple-disc-clutch can be used to brake or hold a planetary member. Who is correct?
both
Technician A says a seized one-way stator clutch will cause the vehicle to have good low-speed operation but poor high-speed performance. Technician B says a freewheeling or non-locking one-way stator clutch will cause the vehicle to have poor acceleration. Who is correct? Note: Be aware that many manufacturers no longer recommend conducting stall tests as torque converter or transmission damage will result. Do not perform a stall test unless specifically instructed from the vehicle service information.
both
Technician A says diagnosis of the transmission and TCC control with a road test is necessary. Technician B says the road test should be conducted with a scan tool connected to the vehicle to monitor engine and transmission operation. Who is correct?
both
Technician A says during transmission reassembly, end play checks should be measured. Technician B says before a transmission is disassembled, end play checks should be measured. Who is correct?
both
Technician A says multiplexing allows information to be shared with many computers. Technician B says multiplexing reduces the number of wires and components needed in current vehicles. Who is correct?
both
Technician A says piston seals are designed to seal against high pressures. Technician B says the seal is positioned so that the lip faces the source of the pressurized fluid. Who is correct?
both
Technician A says some manufacturers monitor clutch volume indexes. Technician B says this is part of an adaptive strategy. Who is correct?
both
Technician A says that if the stall speed of a torque converter is below specifications, a restricted exhaust or slipping stator clutch is indicated. Technician B says that if the stall speed is above specifications, the bands or clutches in the transmission may not be holding properly. Who is correct? Note: Be aware that many manufacturers no longer recommend conducting stall tests as torque converter or transmission damage will result. Do not perform a stall test unless specifically instructed from the vehicle service information.
both
Technician A says the gears in a gear-type oil pump should be replaced if the outer edges of the teeth are worn flat. Technician B says all parts of gear-type pumps are selectively sized. Who is correct?
both
Technician A says the sun gear always rotates in the opposite direction to the rotation of the pinion gears. Technician B says the pinion gears will always follow the same direction as the ring gear when the ring gear and carrier pinions are free to rotate at the same time. Who is correct?
both
Technician A says throttle position is an important input in most electronic shift control systems. Technician B says vehicle speed is an important input for most electronic shift control systems. Who is correct?
both
Technician A says when checking transmission electrical controls to first verify system voltage. With no DTC's present Technician B says to diagnose the transmission based on its symptoms. Who is correct?
both
Technician A says when preparing a new oil seal for installation if the rubber lip is dry, it should be lubed with assembly gel. Technician B says before and during installation, oil seals should be kept clean (as in free from dirt or other contaminates). Who is correct?
both
Technician A says when removing a seal, inspect the sealing surface or lips. Technician B says this check should be done before cleaning the seal. Who is correct?
both
Technician A says when the speed of the turbine nearly equals the speed of the impeller, fluid flows against the stator vanes in the same direction as the fluid from the impeller. Technician B says when there is little vortex flow and the engine's torque is carried through the converter by the rotary flow of the fluid, the coupling phase of the torque converter occurs and no torque multiplication takes place. Who is correct?
both
Technician A says when the transmission is in gear, the fluid coupling allows the vehicle to stop without stalling. Technician B says this is because the impeller doesn't rotate fast enough to drive the turbine. Who is correct?
both
While checking a switch: Technician A says a multimeter is a meter that combines the functions of a voltmeter, an ammeter, and an ohmmeter. Technician B says impedance is best defined as the operating resistance of an electrical device. Who is correct?
both
While discussing GM torque converters: Technician A says the TCC assembly allows for a mechanical link between the impeller and the turbine. Technician B says this is true during all gear ranges except Park, Reverse, Neutral, and Drive Range-First Gear. Who is correct?
both
While discussing endplay checks: Technician A says these checks should be taken before the transmission is disassembled. Technician B says these checks should be taken after the transmission is reassembled. Who is correct?
both
While discussing the construction of typical converter clutch assemblies: Technician A says the clutch plate is splined to the turbine shaft, and when the piston is applied, the plate connects the turbine to the converter. Technician B says the piston and clutch plate assembly has frictional material on the outside of the plate with a spring-cushioned damper assembly in the center. Who is correct?
both
While discussing transmission adaptive learning: Technician A says this learning process allows the TCM to make adjustments to its program so that quality shifting always occurs. Technician B says the TCM learns to respond to the driver's driving habits. Who is correct?
both
While discussing transmission solenoids: Technician A says the TCM relies on information from the engine control system, transmitted through such sensors as the MAP and TP sensor, as well as information from the transmission, to determine the optimum shift timing. Technician B says a TCC solenoid can be modulated to smooth the engagement of the torque converter clutch. Who is correct?
both
technician A says most late-model GM transmissions feature their Electronic Controlled Capacity Clutch (ECCC) system. Technician B says the ECCC allows for a variable amount of clutch slippage. Who is correct?
both
Technician A says when used to control TCC operation, a solenoid opens a hydraulic circuit to the TCC spool valve. Technician B says this causes the spool valve to move and directs mainline pressure to apply the clutch
both Look at figure 4-25 on page 192, from this image it is shown that the fluid is flowing to the shift valve when the solenoid is on and off.
Technician A says engine/transaxle mounts isolate the inherent vibrations of the assembly from the passenger compartment. Technician B says improper mounting of an engine and/or transmission can cause problems with the transmission. Who is correct?
both Rigidly mounted engines and transmissions such as in racing applications transfer more vibration and noise into the cabin.
While checking a transmission range sensor: Technician A says typically the range sensor is actually made up of several switches. Technician B says a faulty TR sensor may allow the engine to start in other gear positions besides Park and Neutral. Who is correct?
both There are many different types of transmission range sensors and testing will be conducted according to the type of design employed.
A PM generator is used to sense throttle position
false
A sprag clutch is a type of multiple disc clutch.
false
DTCs are set by the TCM when the signal return from a component is within its normal operating range.
false
Output torque and output speed are decreased when a large gear drives a small gear.
false
When working on a hybrid vehicle transaxle with orange cables, the high voltage system should be disconnected after the orange cables have been removed.
false
Which of the following is used in all automatic transmissions?
input shaft Some model transmissions may have an automated dry clutch, or a dual dry (or wet) clutch instead of a torque convertor to connect/ disconnect power. Some transmission models have eliminated one-way clutch assemblies and/ or bands opting to use all multiple disc clutch packs throughout. Transmission gearing has been planetary type, direct gear to gear type, or a CVT type that would incorporate a planetary gear set to provide for reverse.
Some transmission control systems monitor the speed of the input shaft and compare it to the speed of the output shaft to determine the _______________.
line pressure, gear ratio, shift patterns
Technician A says a non-positive static seal will allow some fluid leakage between two parts that do not move in relationship to each other. Technician B says a positive dynamic seal allows a controlled amount of leakage between two parts that move in relationship to each other. Who is correct?
neither
Technician A says a normally open (vented) solenoid allows fluid pressure to reach the shift valve until it is energized. Technician B says a normally (closed) applied solenoid does not allow fluid pressure to the shift valve until it is energized. Who is correct?
neither
Technician A says abnormal noises from a transmission will never be caused by faulty clutches or bands. Technician B says abnormal noises from a transmission are typically caused by a faulty torque converter. Who is correct?
neither
Technician A says that thrust washers are used to control radial loads. Technician B says Torrington washers are bearings that take radial loads. Who is correct?
neither
While checking a transmission's vent: Technician A applies a vacuum to it and says that if the vent leaks, it should be replaced. Technician B runs ATF through the vent and says that if the vent cannot hold fluid, it must be replaced. Who is correct?
neither
While checking the stall speed of a torque converter: Technician A maintains full-throttle power until the engine stalls. Technician B manually engages the TCC before running the test. Who is correct? Note: Be aware that many manufacturers no longer recommend conducting stall tests as torque converter or transmission damage will result. Do not perform a stall test unless specifically instructed from the vehicle service information.
neither
While checking torque converter endplay: Technician A says the torque converter must be installed in the transmission. Technician B says the torque converter endplay is corrected by installing a thrust washer between the oil pump and the direct or front clutch. Who is correct?
neither
While discussing current manufacturer transmission coding: Technician A says Ford model numbers do not indicate the duty rating of the transmission. Technician B says Chrysler model numbers indicate the number of planetary units used in the transmission. Who is correct?
neither
While discussing valve body assemblies in late-model transmissions: Technician A says the valve body is no longer needed in some electronically controlled transmissions. Technician B says an EPC solenoid maintains constant fluid pressure through the valve body regardless of the vehicle's operating condition. Note: Review Chapter 3 material regarding valve bodies on Pages 92-93. Who is correct?
neither Although the incorporation of electronic controls are continuing to expand, there still exists a need for valving and hydraulic controls. Electronic pressure control solenoids that don't vary the pressures they control are considered defective, unless the transmission is in failsafe and the transmission control module is trying to protect the transmission by holding it at high pressure.
Technician A says a generic DTC is designated by a P1XXX, P2XXX or P3XXX code. Technician B says manufacturer-specific codes are designated by P0XXX codes. Who is correct?
neither DTC's that are P1XXX are manufacturer specific codes.
Technician A says once the transmission is removed and before it is disassembled, the outside of the transmission should be cleaned. Technician B says no matter what type of cleaning procedure is followed, the transmission and parts should be rinsed with water and then thoroughly dried with compressed air before reassembly. Who is correct?
neither The general cleaning procedure explained on page 260 (Shop Manual) is not correct. Please review the Chapter 5 Addendum material in Canvas modules that explains thoroughly the proper cleaning procedure along with explanations why the course text materials are incorrect.
Technician A says seals should be kept clean and free of dirt, before and during installation. Technician B says most seals should be installed dry. Who is correct?
tech A
Technician A says shift solenoids either allow or block fluid flow from the various apply devices in the transmission. Technician B says shift solenoids are used to mechanically apply a brake band or multiple-disc clutch assembly. Who is correct?
tech A
Technician A says that the TCM monitors the MAP values, to evaluate the need for changes to the shift schedule of the vehicle. Technician B says the TP sensor voltage signal is sent to the PCM as an indication of engine temperature. Who is correct?
tech A
Technician A says the output shaft connects the output of a driving member to the final drive unit. Technician B says the input shaft connects the impeller of the torque converter to the front driven member in the transmission. Who is correct?
tech A
While checking voltage drops: Technician A connects the voltmeter across the load with the circuit activated. Technician B connects the negative meter lead to ground and the positive lead to the component being tested. Who is correct?
tech A
While discussing the operation of the stator: Technician A says the stator redirects the fluid leaving the turbine back to the impeller. Technician B says only a portion of the fluid returning from the turbine to the impeller passes through the stator. Who is correct?
tech A
While discussing transmission lip seals: Technician A says the most important thing when installing a lip seal is to make sure the lip is facing in the correct direction. Technician B says the lip should always be aimed away from the source of pressurized fluid. Who is correct?
tech A
While servicing a variable-displacement vane-type pump: Technician A says the pump rotor, vanes, and slide have selective sizes and may destroy the pump if the correct ones are not used. Technician B says the outer edge of the vanes should be flat. Who is correct?
tech A
Technician A says before tearing down a transmission, you should inspect the debris trapped in the fluid filter. Technician B says installing an overhaul kit will take care of all the problems with a transmission. Who is correct?
tech A The material trapped in the filter can help give the technician an idea of the type of internal damage by inspecting the material.
Technician A says all transmission problems can be corrected by installing a rebuild kit. Technician B says a technician should inspect the material in the filter before tearing down the transmission or transaxle. Who is correct?
tech B
Technician A says an ohmmeter can be used to test semiconductors. Technician B says a low-impedance ohmmeter should be used on electronic circuits. Who is correct?
tech B
Technician A says high current is caused by high resistance. Technician B says a short to ground can occur internally within a component. Who is correct?
tech B
Technician A says the default gear is the normal gear selection. Technician B says the default gear is normally the gear selected by the TCM when the solenoids are off. Who is correct?
tech B
Technician A says the rear hub of the torque converter is bolted to the flexplate. Technician B says the flexplate is designed to be flexible enough to allow the front of the converter to move forward or backward if it expands or contracts because of heat or pressure. Who is correct?
tech B
Technician A says torque converter clutch control problems are always caused by electrical malfunctions. Technician B says nearly all converter clutches are engaged through the application of hydraulic pressure on the clutch. Who is correct?
tech B
While discussing torque converter clutch engagement solenoids: Technician A says some systems use a PM generator-type solenoid, which allows for full-time, but controlled, slip. Technician B says some converter control systems use a pulse-width modulated solenoid. Who is correct?
tech B
While discussing various sensors used with an electronic transmission control system: Technician A says potentiometers are typically used to measure temperature changes. Technician B says MAP sensors are used to measure engine load. Who is correct?
tech B
While inspecting an output shaft: Technician A says if the shaft is fitted with a check ball that does not appear to be seated properly, that oil circuit would have high oil pressure. Technician B says scoring of the shaft may be the result of a blocked oil delivery passage. Who is correct?
tech B
Technician A says a transistor is used to measure transmission temperature. Technician B says the PCM changes the operation of many systems based on temperature. Who is correct?
tech B The transmission temperature sensor is a thermistor, and it's signal affects many of the PCM/ TCM controlled circuits.
Complete the following statement. Pulse width is ______________________________
the length of time something is energized
A Simpson gear set contains two planetary gear sets that present which of the following situations?
they share a common sun gear
All trouble codes will cause the MIL to illuminate
true
An EPC solenoid replaces the conventional TV cable.
true
Before completing relearn procedures, transmission or transaxle computers can cause harsh or poor shift quality.
true
The gears within the Planetary carrier are also known as pinion gears.
true