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Question for Rick/Mike
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John Sargent Offline
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Post: #1
Question for Rick/Mike
Gents,
I've got my dry cell connected to a pwm, then to a relay, then to the battery. The wideband afr efie gets power from the + wire between the relay and pwm, so when the system is off the efie is off. Today I looked under the hood, efie was on, pwm fan running, it is turned on about 1/3 of the way of a 30 amp pwm. When I checked the voltage at the + terminal of the dry cell, it showed about 5 volts and it didn't seem to be doing anything.
Would you have any ideas what is going on?
Thanks,
John
01-29-2009 07:13 PM
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colchiro Offline
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RE: Question for Rick/Mike
Hi John.

What's the voltage between the relay and PWM (or at your efie)?

Probably not a good idea to power your efie from the same source as your pwm, could be a little noisy.

You might also confirm you have a good connection on the other side of your cell (the ground).

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
(This post was last modified: 01-29-2009 07:30 PM by colchiro.)
01-29-2009 07:29 PM
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John Sargent Offline
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RE: Question for Rick/Mike
(01-29-2009 07:29 PM)colchiro Wrote:  Hi John.

What's the voltage between the relay and PWM (or at your efie)?

Probably not a good idea to power your efie from the same source as your pwm, could be a little noisy.

You might also confirm you have a good connection on the other side of your cell (the ground).

Thanks, Rick. I'll ck the voltage at the pwm and efie. Why would it be noisy though? I want to make sure the efie is off when the cell is, how would you recommend wiring it to accomplish that? Thanks again, John
01-30-2009 04:47 AM
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colchiro Offline
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RE: Question for Rick/Mike
The PWM quickly changes the voltage at the cell, which could be 20 amps on/off/on/off, etc. This would create voltage fluctuations on the wire going to the efie. If your efie is working properly, I wouldn't worry about it, but I'm just pointing out a possible problem. Obviously a radio connected to that wire would be more sensitive than an efie.

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
01-30-2009 02:42 PM
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