Electronic Automatic Transmissions (final)
Tech B
A transmissions has delayed upshifts under all operating conditions: Tech A says that low mainline pressure can cause this. Tech B says that a faulty TFT sensor can cause this. Who is correct?
Pressure regulator valve
A type of valve that allows the air pressure in a pneumatic system to be adjusted to a specific level.
Adaptive Cruise Control
ACC stands for what?
worn torque converter clutch
All of the following could cause incorrect shift timing and poor shift quality except: - low battery voltage - poor electrical connections - defective input/output speed sensors - worn torque converter clutch
Both
An electronically controlled transmission has erratic shifting: Tech A says that poor PCM ground will cause this problem. Tech B says that erasing the TCM memory may cause erratic shifting. Who is correct?
Powertrain Control Module
PCM stands for what?
Transmission Control Module
TCM stands for what?
Tech A
Tech A says that a faulty TP sensor can cause delayed shifts. Tech B says that delayed shifts can be caused by an open shift solenoid. Who is correct?
Tech A
Tech A says that some shift solenoids can be activated by providing a ground for the solenoid. Tech B says that some shift solenoids can be activated by applying hydraulic pressure to their valve. Who is correct?
Both
Tech A says that throttle position is an inportant input in most electronic shift control systems. Tech B says that vehicle speed is an important input for most electronic shift control systems. Who is correct?
Tech A
Tech a says that shift solenoids direct fluid flow to and away from the apply devices in the transmission. Tech b says that shift solenoids are used to mechanically apply a friction brake or multiple-disc clutch assembly. Who is correct?
Both
Tech a says that some systems use a special modulated shift control solenoid. Tech B says that some systems use a special modulated converter clutch control solenoid. Who is correct?
Both
While diagnosing the cause of TCC shudder: Tech A checks the fluid pressure sent to the clutch. Tech B says that because the shudder occurs only after the clutch is engaged, the problem is the engine, transmission, or another component of the driveline. Who is correct?
Both
While discussing transmission adaptive learning: Tech A says that the transmission learns to respond according to the current condition of the engine and transmission. Tech B says that the TCM learns to respond to the driver's driving habits. Who is correct?
Neither
While discussing valve body assemblies in late-model transmissions: Tech A says that the valve body is no longer needed in some electronically controlled transmissions. Tech B says that an EPC solenoid maintains constant fluid pressure through the valve body regardless of the vehicle's operating condition. Who is correct?
voltage drop
a decrease in voltage along a conductor through which current is flowing
a damaged magnet in the sensor
a glitch appears in the waveform of a vehicle speed sensor. Which of the following is not a probable cause of the problem? - a loose connector - a damaged wire - a poorly mounted sensor - a damaged magnet in the sensor
battery temperature
all of the following inputs are crucial to the proper operation of an electronically controlled automatic transmission except: - engine speed - engine load - vehicle speed - battery temperature
Shift schedules and open loop
although computers receive different information from a variety of sensors, the decisions for shifting are actually based on more than the inputs. What else are they based on?
Fuse B+
fuse gets power even when key is switched off
MG1
in a toyota hybrid CVT, which of the following parts effectively controls the overall gear ratio of the transaxle? - MG1 - MG2 - Reduction Unit - Transaxle Damper
battery voltage, blown fuse, poor connections, defective solenoids, and crossed wires
name five things that could cause incorrect shift times and poor shifting quality
false
on most late-model EAT systems, separate procedures must be followed to retrieve the Diagnostic Trouble Codes from the transmission control system and the Torque Transfer Control system
High side driver
switch is on the negative side on load device
Low side driver
switch is on the positive side on load device
true
the neutral safety switch and reverse lamp switch are typically part of a digital transmission range sensor
Line Pressure
the specification that is the maximum pressure that can be applied to both ports at the same time
rotational speed
voltage generation devices are typically used to monitor what?
adaptive learning, different operational modes, and optional manual shifting
what are the advantages of using electronic controls rather than relying on conventional hydraulic controls in a transmission?
air pressure
what can be applied to the parts that would be exposed to fluid pressure to check an electrical switch?
Electronic Pressure Control
what does EPC stand for?
it looks at engine temperature to estimate ATF temperature
what happens if the Transmission Control Module determines that the signals from the Transmission Fluid Temperature sensor are incorrect?
engine speed, engine load, throttle position, and engine temperature
what inputs are of prime importance to a computer in deciding when to shift gears?
adaptive learning
what is it called when a transmissions is able to change transmission behavior based on the current condition of the transmission and engine, current operating conditions, and the driver's habits? most late-model transmissions have this feature
Multiplexing
what is it called when electrical signals are transmitted by a peripheral serial bus, allowing multiple devices to share signals?
MAP
which of the following is not a voltage-generating type sensor? - vehicle speed sensor - Output Shaft Speed sensor - Manifold Absolute Pressure sensor - Input Shaft Speed sensor
a solenoid will not energize
which of the following would probably not be caused by a plugged filter screen at a solenoid? - erratic shifting - no shift conditions - a solenoid that will not energize - wrong gear starts
