pwm or non-pwm?? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 09-10-2007, 12:07 PM   #1 (permalink)
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pwm or non-pwm??

is there an easy way to tell if my 4r100 transmission is pwm or non-pwm?
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Old 09-10-2007, 01:47 PM   #2 (permalink)
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Re: pwm or non-pwm??

what does pwm mean?
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Old 09-10-2007, 03:14 PM   #3 (permalink)
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Re: pwm or non-pwm??

Pulse Width Modulated solenoid.

It is a way to control the solenoid. Earlier transmissions used a solenoid that was 100% off or 100% on. There was no in between. A PWM modulates how much time it is on and off. It can run almost any percentage on vs. off to control the output pressure.

The on/off solenoid was turned on, and the speed of the torque converter clutch apply was controlled by an orifice. The PWM system doesn't have an orifice in the circuit. The PCM controls the duty cycle of the solenoid to control the pressure to control the speed of the torque converter clutch.
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Old 09-10-2007, 03:40 PM   #4 (permalink)
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Re: pwm or non-pwm??

Utilizing PWM in a program can greatly diminish the snap when the T/C locks up. My current burns are not PWM, and lemme tell ya, it is obvious. Whenever the T/C locks, you know about it.
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