PWM valve troubles
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Read the manual to see if your question is answered there before posting. If you have questions about MS1/Extra or MS2/Extra or other non-B&G code configuration or tuning, please post them at http://www.msextra.com The full forum rules are here: Forum Rules, be sure to read them all regularly.
PWM valve troubles
My pwm seems to not change pulse width with different coolant temps, on the stim the FIDLE light is always fully on and does not change when i change the settings around in the PWM Idle tables. I have done the TIP121 mod and the transistor seems to be working normally. Is there anything more i can do to test the circuit without an O-scope.
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MegaScott
- MegaSquirt Guru
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The switching time of the PWM is fast enough that you won't see any change in the LED. You can try using a light bulb as a load, and use a series 1 ohm resistor, put your voltmeter across the resistor and then vary the CLT you should see more current when cold, less current when warm. Sometimes just using a regular 12v bulb works as a load too for showing the average DC levels when PWM is turned on.
