What is error code P1778?
|P1778 Meaning This diagnosis item detects when the electrical system is OK, but the mechanical system is NG. This diagnosis item detects when the state of the changing the speed mechanism in the unit does not operate normally.
What are the 4 aspects of on / off change in a step motor?
The step motor’s 4 aspects of ON/OFF change according to the signal from Transmission Control Module (TCM). As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. This diagnosis item detects when electrical system is OK, but mechanical system is NG.
How does error accumulate in a stepper motor?
The remarkable feature of steps motors, though, is that this error does not accumulate from step to step. When a standard stepper motor travels one step it will go 1.8° ± 0.05°. If the same motor travels one million steps, it will travel 1,800,000° ± 0.05°. The error does not accumulate. Stepper motors can respond and accelerate quickly.
How is the speed of a stepper motor controlled?
Stepper motors are controlled by a driver, which sends the pulses into the motor causing it to turn. The number of pulses the motor turns is equal to the number of pulses fed into the driver. The motor will spin at a rate that is equal to the frequency of those same pulses. Stepper motors are very easy to control.
When does a Nissan step motor function is ng?
As a result, the flow of line pressure to the primary pulley is changed and the pulley ratio is controlled. This diagnosis item detects when the electrical system is OK, but the mechanical system is NG. This diagnosis item detects when the state of the changing the speed mechanism in the unit does not operate normally.
What kind of error does a stepper motor have?
A stepper motor is a mechanical device that is manufactured to a certain tolerance. Typically a standard motor has a tolerance of +/- 5% nonaccumulative error regarding the location of any given step. This means that any step on a typical 200 step per revolution motor will be within a 0.18-degree error range.
The step motor’s 4 aspects of ON/OFF change according to the signal from Transmission Control Module (TCM). As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. This diagnosis item detects when electrical system is OK, but mechanical system is NG.
What happens when a step motor stalls out?
If a step motor stalls out, it is unlikely that it will burn up as with most ac and dc motors. If the motor does burn up it indicates a driver problem. (We will explore why this is the case in the next article.)
Why is the power of a step motor independent of speed?
To help understand why a step motor’s power is independent of speed, we need to construct (figuratively) an ideal step motor. An ideal step motor would have zero mechanical friction, its torque would be proportional to ampere-turns and its only electrical characteristic would be inductance.