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hooking up all 02 sensors
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franka Offline
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Post: #1
hooking up all 02 sensors
why can't you hook up all 02 sensors to one efie
02-15-2009 02:28 PM
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colchiro Offline
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Post: #2
RE: hooking up all 02 sensors
Hi Franka.

The most you can connect to Mike's efies are 2 (like most other brands), but most vehicles you only need to treat the two front o2's (before the cat).

We just found out in the last 6 months or so that a few vehicles, primarily late model Chrysler and Jeep, need an efie for the rear o2's as well.

On many new vehicles the front o2's are wide band and the rears are narrow band so you'd need a wide band efie for the front and a narrow band for the rear, if you also needed to treat the rear o2's.

FWIW, Mike's wide band efie is the only one we know of that is truly wide band.

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
02-15-2009 02:39 PM
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mike Offline
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RE: hooking up all 02 sensors
(02-15-2009 02:28 PM)franka Wrote:  why can't you hook up all 02 sensors to one efie

Each sensor is outputting voltages based on the oxygen present in the exhaust. The voltage range is between .1 and .9 volts or so. It changes from high to low 2 or 3 times per second.

If you connected the signal wires of 2 sensors, the signal wires would mush each other up. So you can't connect 2 sensors to one EFIE because the EFIE would receive a mush and the output would also be a mush.

To avoid that, we created a dual EFIE that will handle the signals from 2 separate oxygen sensors and give separate outputs for each.

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02-16-2009 02:29 PM
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uberhho Offline
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Post: #4
RE: hooking up all 02 sensors
Typically, what voltage range do o2 sensors work in?
02-19-2009 11:11 PM
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colchiro Offline
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RE: hooking up all 02 sensors
See my Documents link for info on your o2 sensor. Narrow band o2's rapidly change between .1 and .9 VDC.

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
02-20-2009 02:41 PM
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