Automatic Transmission A2

clearance betwen valves and matching valve body b ores should not exceed

.001 in .003 in .005 in .008 in A, .001 inches

Discussing battery capacity test with bat temp at 70F. A says battery is satisfactory if voltage remains above 9.6 volts. B says battery discharge rate is calculated by multiplying two times battery reserve capacity rating.

A is correct

A planetary gearset is being inspected. A says that all splined shaft mounted gears must have the splines inspected for shifting of the splines. B says that blackened gears or pinion shafts indicate overheating and should be replaced

A is correct. Blackened gears are indications of overloading and carrier shoud be replaced

A says on some transmissions, the throttle linkage may control both the downshift valve and the throttle valve. B says some transmissions use a vacuum modulator to control the downshift valve.

A is correct. Vacuum modulators are used to control the throttle valve not downshift valves

A says an air test can be used to check servo action. B says air test can be used to check for external leaks.

A is correct. air check doesnt check external leaks

inspecting drive chain and sprockets during rebuild, chain deflection is found to exceed spec. A says the sprockets should be checked for tooth wear. B says the drive chain can be shortened to repair the problem.

A is correct. drive chains can't be shortened because they have specific lengths... replace only

After a non computer-controlled transaxle and valve body overhaul, the transaxle does not complete a 1-2 upshift, and shifts from first gear to third gear. All other shifts are normal, and this problem was not present before the overhaul. Technician A says the valve body torque may be excessive. Technician B says the governor pressure may be too low.

A is correct. if problem wasnt present before most likely cause is overtorqued valve body

transmission is diagnosed to have a sticking valve in the valve body. A says poor maintenance and overheating will cause this. B says the valve body must be removed to address this problem

A is correct. valve body nay not need to be removed.

A says an air test can be used to check servo action. B says air test can be used to check for internal fluid leaks.

A only air test is never used to find any leaks

discussing band operation. A says servo is hydraulically operated piston assembly used to apply the band. B says accumulator is hydraulic piston assembly that helps a servo quickly apply the band.

A only. B is wrong because accumulators are spring loaded pistons that provide hydraulic cushion

auto transaxle complain of harsh 3-4 upshift. all other are normal. A says fourth accumulator piston may be stuck. B says pressure regulator valve is sticking

A only. accumulators dampen shifts, pressure regulator valve would cause isues with more than just 3-4 shift

A says improper shift linkage adjustment may cause premature trans clutch failure. B says improper shift linkage adjustment may cause higher than normal fluid pressure.

A only. misadjusted linkage would cause lower than normal fluid pressure

while performing clutch plate clearance measurement. dial indicator reading is more than specified. to correct, install

A thicker snap ring. There are no thrust washers in clutch packs.

end play is being adjusted. the purpose of measuring the reverse clutch drum face with a depth micrometer as shown is to determine the proper...

A. clutch pack retaining ring thickness b. clutch pack reaction plate thickness c. steel clutch plate thickness d. selective washer thickness D. Selective washer thickness

if a gear selection linkage on an automatic transmission is misadjusted all of the following could happen but

A. poor gear engagement b. low fluid pressure. C. gear indicator reading incorrect. D. leak at converter hub D. leak at converter hub all others are likely results of indicated problem

Input and output shafts can be of the following types EXCEPT:

A. solid. B. compound. C. tubular. D. drilled. B

A says torque converter clutch control problems are always caused by electrical malfunctions. B says nearly all TCC are engaged through application of hydraulic pressure on the clutch.

B is correct

An automatic transmission has whining noise in all gears while driving. noise is also present with engine running and car stopped. A says rear planetary gearset may be damaged. B says the oil pump may be the problem.

B is correct.

discussing various sensors used with an electronic transmission control system. A says potentiometers are typically used to measure temp chagnes. B says vacuum modulators are used to measure engine load.

B is correct. A is meant to measure movement like throttle position sensor

FWD vehicle experiences intermittent shifting. sometimes normal, and occasionally misses a shift. A says manual shift valve shift linkage may need adjusting. B says the engine or transaxle mounts may be broken

B is correct. A is wrong because if the manual valve shift linkage were misadjusted, it would cause a problem all the time

customer complains about fluid usage in auto trans, and there are no visible signs of fluid leaks. A says transmission vent may be plugged or restricted. B says the vacuum modulator diaphragm may be leaking.

B is correct. A is wrong because plugged or restricted transmission vent would cause excessive pressures and internal leak.

a vacuum modulator is being inspected on auto trans. A says vacuum modulator should be recieving venturi vacuum. B says if fluid leaks from the modulator with the vacuum line disconnected, the modulator should be replaced.

B is correct. A is wrong because the vacuum modulator should have manifold vacuum

Discussing pressure test. A says test is most valuable diag check for single gear slippage. B says test can identify cause of late or harsh shifting.

B only.

while checking clutch disks. A says the steel plates should be replaced if they are worn flat. B says friction discs should be squeezed to see if they can hold fluid.

B only. steels should be checked for thickness

A says throttle position is an important input for most electronic shift control systems. B says vehicle speed is an important input for most electronic shift control systems.

Both

A says to road test an electronic transmission, you should connect a scan tool to monitor engine and transmission operation. B says the electrical system should be checked for proper operation.

Both

All trans pressures are normal at idle speed, but low at WOT. A says throttle valve cable may need adjust. B says vacuum modulator may be damaged

Both

checkign condition of a cars ATF. A says if the fluid has a dark brownish or blackish color and a burned odor the fluid has overheated. B says if the fluid has a milky color, this indicates that engine coolant has been leaking into the transmission cooler.

Both

while discussing the proper way to diagnose a kick down switch, A says when the throttle pedal is fully depressed, a click should be heard just before the pedal reaches its travel stop. B says if the transmission cannot be forced to automatically downshift, the kickdown switch could be open and should be replaced.

Both are correct

after checking fluid level of vehicle, fluid looks and smells burnt. A says engine cooling sytem should be checked for proper operation. B says customer may need an external cooler if using vehicle for towing or performance applications.

Both are correct.

customer complains about slippage between shifts. A says low fluid can cause low pressures causing slippage. B says low fluid can be indicator there is an external fluid leak.

Both are correct.

discussing adjustments on auto trans. A says three basic adjustments are backlash, end play, and preload. B says excessive backlash can cause borken gear teeth.

Both are correct.

A says most vibration problems are caused by an unbalanced torque converter. B says vibration problems can be caused by a faulty output shaft.

Both.

A says that if transmisison bands are squeezed and fluid appears, the band is still useable. B says that the clutch drum should be inspected with the bands.

Both.

Trans wont downshift from cruising speed. A says throttle valve cable may be out of adjustment. B says kickdown switch may be open.

Both.

computer controlled transaxle doesnt shift into 4th. A says begin diag with basic inspection of wires and hoses. B says battery voltage should be tested.

Both.

during air pressure test on reverse clutch. application is not heard and hissing noise is evident. A says transmission case may be cracked. B says reverse clutch drum may be cracked.

Both.

engine shudders immediately after TCC lockup. A says engine may have ignition problem. B says fuel injection system may have a lean condition.

Both.

extension housing in the figure experiences repeated extension housing rear seal failures. A says to check the transmission vent for blockage. B says replace extension housing bushing.

Both. even though reported rear seal failures, extension housing bushing needs replacing

Transmission experiences repeated pump seal failure, and no other complaints. A says pressure regulator valve may be sticking. B says the drainback hole behind the seal may be plugged

Both. if the drainback hole was plugged it would blow the seal.

Red lubricant is leaking from the torque converter access cover. When removed the shell of the coverter is wet with fluid, but the front of the coverter is dry. the cause could be

Leaking transmission oil pump seal. Leaking converter drain plug would cause front of converter to be wet with ATF, leaking rear main would cause front of coverter to be wet with oil, loose rear main bearing caus noisy engine, and front would be wet.

during stall test, stall speed is above spec. A says exhaust system may be restricted. B says engine may have low compression.

Neither.

During stall test, engine speed is less than spec. A says turbine and torque converter may be damaged. B says some of the transmission clutches may be slipping.

Neither. A is wrong because damaged stator one way clutch would cause low engine stall speed, not inoperative turbine. B is wrong because slipping transmission clutches cause higher engine stall speeds not lower.

A says a one way overrunning clutch can be either roller or sprag type. B says a roller clutch utilizes roller bearings held in place by sprags, which separate the inner and outer race of the clutch assembly.

Neither. A is wrong because image shows roller type not sprag??? B is wrong because sprags don't separate, applying springs hold rollers in place

computer controlled transaxle has a relay that supplies voltage to solenoids and switches in the transaxle when the ignition switch is turned on. Computer senses a problem in the input speed sensor and does not close the relay. under this condition the transaxle operates in

Second gear and reverse

all are true about bushing inspection and measurement except

a. a scored shaft in the bushing contact area may indicate a lack of lubrication b. the shaft to bushing clearance may be measured with a wire type feeler gague c. the shaft to bushing clearance may be measured with a vernier caliper and micrometer d. normal bushing clearance is .015 to .025 inches D is the only wrong

all of the following could result in clutch disc burning except

a. a sticking clutch drum check ball b. a reduced clutch pack clearance c. a damaged clutch piston seal d. a higher than spec line pressure D is correct. A is wrong because sticking clutch drum ball causes clutches to slip

rear wheel drive vehicle has a vibration that increases in relation to the vehicle speed. This vibration also is present when the engine is accelerated with the vehicle stopped and in N or P. the cause could be

a. bad torque converter balance b. bad driveshaft balance. c. bad driveshaft angles. d. bad engine mounts. A.

A torque converter clutch doesnt lock up at any vehicle speed or engine temperature. this cause could be

a. damaged torque converter clutch solenoid. b. damaged stator clutch c. leaking second pseed servo piston seal d. sticking pressure regulator valve A.

noise is present in all gears except P and N, most likely cause are all except.

a. drive chain b. torque converter c. oil pump d. input shaft C.

erratic spedometer could be caused by all of the following except

a. missing drive gear retaining clip. b. dry speedometer cable c. worn speedometer gear d. worn driven gear retaining bushing A.

all of the following about trans removal and replacement are true except

a. negative bat cable should be disconnected prior to removal b. driveshaft should be marked in relation to diff flange. c. engine support fixture should be installed before loosening transaxle to engine bolts. D.front drive axles should be marked in relation to front hubs. D is correct

following seals are common sources for leaks in an auto transmission except

a. oil pan seal b. speedometer drive seal c. electrical components installed into transmission case d. accumulator seal D is correct. all others are common sources of leaks

all of the following about parking pawl are true except

a. parking pawl locks input shaft b. parking pawl is mechanically operated. c. parking pawl projection is engaged in a notched drum d. the parking pawl is retained on a pivot pin A is correct. It doesnt lock input shaft, it locks the output shaft

an improper band adjustment may cause

a. shifts at a lower vehicle speed than specified b. transmission slipping in some gears c. shifts at a higher vehicle speed than specified d. transmission slipping in all gears B, A and C are wrong because shift speeds are controlled by throttle valve. D is wrong because one band wouldnt cause all gears to slip

The shifts in an automatic transaxle occur at a higher speed than specified. All of the following items could be the cause of the problem except

a. sticking governor b. excessive governor spring tension c. worn governor weights and pins d. weak governor spring tension. D is correct. Worn governor weights or springs will cause erratic shifts at all speeds.

As shown, a computer controlled transaxle remains in second gear at all forward vehicle speeds. The cause of the problem may be

a. worn oil pump b. a damaged shift solenoid c. restricted filter d. an improper linkage adjustment B

A says blocked oil delivery passage will cause the shaft to score. B says if the shaft is fitted with a b all and the b all doesnt seat properly, loss of oil pressure will result

both

A says case porosity between two fluid passages could result in pressure bleed off and clutch burnout. B says case porosity between two fluid passages could result in the transmission being in two gears at once, resulting in a jam-up

both are correct..

torque wrench on transaxle extension housing. most likely a measurement of what

dif turning torque

an engine has a clunking noise that usually occurs during deceleration and sometimes with the engine idling. The cause of this noise could be loose:

main bearings coverter to flex plate bolts connecting rod bearings piston pins B is correct. main bearings would cause engine noise under load and on acceleration. conecting rod bearings would cause engine noise under a load and on acceleration, not decel piston pins would cause engine noise under a load and on acceleration

fluid sometimes escapes from the dipstick tube on an auto transaxle. A says the transaxle fluid may be contaminated. B says the transaxle cooler may be damaged.

neither are ecorrect

With engine idling, automatic transmission fluid flow through cooler should be

one quart in 20 seconds

in the figure...

skip question

when removing transmission on a rear wheel drive vehicle, remove all except

trans cooler lines flexplate torque converter inspect cover driveshaft B flexplate