automatic transmission section 2 test: CH 4, 5, 6, With Complete Solution
Voltage generation devices are typically used to monitor rotational speeds.
Which of the following is NOT a voltage-generating type sensor?
MAP
While discussing transmission solenoids:
Technician A says the TCM relies ...
automatic transmission section 2 test:
CH 4, 5, 6, With Complete Solution
Voltage generation devices are typically used to monitor rotational speeds.
Which of the following is NOT a voltage-generating type sensor?
MAP
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 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
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
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
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
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
, 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 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
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.
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
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