6.7 EGR Servo Motor Mod?? - Page 3

LSmith · 06-30-2008, 05:28 PM

Based on that then you would assume that wires 6,7 & 8 control the opening and closing, 2,3 & 4 are position indication and 1 & 5 supply the power to the sensor. The next obvious question would be what combination of each tell it to open or close.

Is the electronic version of the manual you pulled from on this site?

Last question (for Slagburn)-- did you do the EGR delete on your truck

__________________
2007.5 2500 4X4 Quad Cab 6.7L
Len

***slagburn*** · 06-30-2008, 05:43 PM

Quote:

Originally Posted by LSmith

Is the electronic version of the manual you pulled from on this site?

That is from they call the "Service Information CD" which can be purchased at various places on the net.

Quote:

Originally Posted by LSmith

Last question (for Slagburn)-- did you do the EGR delete on your truck

Not yet.

__________________
07.5, 6.7, Auto, QC, 4x4, Lots of gauges - ISSPRO (Pyro, Boost, Trans Temp) PriCol Optix (Fuel Pressure Lift/Rail) AutoMeter (Oil Pressure) - Dynatrac Free-Spin Hub Conversion Kit - RETRAX bed cover - homebrew shaved bluetec badge - plugged up EGR - Baldwin BF1212 water separator and CAT 1R0750 fuel filter - MSD Dashhawk - Baldwin B164 Bypass Filter

LSmith · 06-30-2008, 07:09 PM

Thanks for the info!!

__________________
2007.5 2500 4X4 Quad Cab 6.7L
Len

Shibbyutman · 07-01-2008, 05:43 AM

Quote:

Originally Posted by LSmith

Based on that then you would assume that wires 6,7 & 8 control the opening and closing, 2,3 & 4 are position indication and 1 & 5 supply the power to the sensor. The next obvious question would be what combination of each tell it to open or close.

It isn't the fact that we want to tell it to open or close. It is that we want to mimic what it provides as a load on the ECM and what it provides as feedback. You can measure the resistance between the three "control" pins. The control is set up by the ECM at a very high rate of speed. Each pin can be used as either a power or ground for either coil. So depending on current direction and the pin it is applied it pulls the motor further around. There are three "hall effect" sensors on the sensor board at the end of the EGR valve. These sensors follow a 12 pole magnet around and switch polarity each time a differing pole goes by producing a square wave output depending on the speed of the movement. That is what we want to imitate.

__________________
2003 Dodge Ram 2500 4X4, Banks Big Hoss Bundle, K&N FIPK, 5" Turbo back Expand-It exhaust, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.ABS Brake Specialist-You've got questions, I've got answers.

***Compcowboy*** · 07-01-2008, 06:50 AM

Quote:

Originally Posted by Shibbyutman

It isn't the fact that we want to tell it to open or close. It is that we want to mimic what it provides as a load on the ECM and what it provides as feedback. You can measure the resistance between the three "control" pins. The control is set up by the ECM at a very high rate of speed. Each pin can be used as either a power or ground for either coil. So depending on current direction and the pin it is applied it pulls the motor further around. There are three "hall effect" sensors on the sensor board at the end of the EGR valve. These sensors follow a 12 pole magnet around and switch polarity each time a differing pole goes by producing a square wave output depending on the speed of the movement. That is what we want to imitate.

I dont think i understood a single part of that post Shibby. Good thing i didnt try my own.

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txrlk · 07-01-2008, 11:25 AM

Quote:

Originally Posted by Shibbyutman

It isn't the fact that we want to tell it to open or close. It is that we want to mimic what it provides as a load on the ECM and what it provides as feedback. You can measure the resistance between the three "control" pins. The control is set up by the ECM at a very high rate of speed. Each pin can be used as either a power or ground for either coil. So depending on current direction and the pin it is applied it pulls the motor further around. There are three "hall effect" sensors on the sensor board at the end of the EGR valve. These sensors follow a 12 pole magnet around and switch polarity each time a differing pole goes by producing a square wave output depending on the speed of the movement. That is what we want to imitate.

HUH???????

__________________
2007.5 6.7 auto 3500 SLT Quad Cab DRW - Stock -2006 Honda Civic Hybrid = 2004 Suzuki XL-7 = 2001 Pathfinder SE 4x4

Shibbyutman · 07-01-2008, 11:32 AM

Exactly, now you know why there is no code free delete yet...

__________________
2003 Dodge Ram 2500 4X4, Banks Big Hoss Bundle, K&N FIPK, 5" Turbo back Expand-It exhaust, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.ABS Brake Specialist-You've got questions, I've got answers.

LSmith · 07-01-2008, 05:00 PM

I understand all of that, but position wise there is a point where the valve is closed, whatever the 1's and 0's are. And I'm not suggesting code free. I just want to figure out the combination to those 6 wires to keep the valve shut, from an external source. If the ECM sees it can't control the valve, but it knows it's position, logically it would respond with all of the other variables to allow the engine to run. Yes, it will set a code because it can't control the valve, but the code "shouldn't" be more severe than unplugging the EGR valve all together.

It may not work, but I won't know if I don't try!

__________________
2007.5 2500 4X4 Quad Cab 6.7L
Len

Shibbyutman · 07-01-2008, 06:32 PM

If you have some way of making a PWM signal of approximately 80% duty cycle you can apply that 12v signal to pin 6 and 7 and make 8 to ground that would get you pretty close from what I have seen. The stepper motor appears to be powered througout operation of the engine to prevent just what we have said here, shifting from boost. It is these PWM signals that maintain a little force on the valve and allow it to remain closed.

__________________
2003 Dodge Ram 2500 4X4, Banks Big Hoss Bundle, K&N FIPK, 5" Turbo back Expand-It exhaust, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.ABS Brake Specialist-You've got questions, I've got answers.

LSmith · 07-01-2008, 08:05 PM

12 Volt DC PWM -- that may be a little difficult.........

If we knew the current draw required, you could size a diode to shunt the voltage spike. Then you could just send it a 12VDC signal. May be more trouble than it's worth...

__________________
2007.5 2500 4X4 Quad Cab 6.7L
Len

Last edited by LSmith : 07-01-2008 at 08:23 PM.

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06-30-2008, 05:28 PM	#25 (permalink)
LSmith Cummins Fanatic Join Date: Jun 2008 Location: Alabama Posts: 111 LSmith's Truck Pics	Based on that then you would assume that wires 6,7 & 8 control the opening and closing, 2,3 & 4 are position indication and 1 & 5 supply the power to the sensor. The next obvious question would be what combination of each tell it to open or close. Is the electronic version of the manual you pulled from on this site? Last question (for Slagburn)-- did you do the EGR delete on your truck __________________ 2007.5 2500 4X4 Quad Cab 6.7L Len

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06-30-2008, 07:09 PM	#27 (permalink)
LSmith Cummins Fanatic Join Date: Jun 2008 Location: Alabama Posts: 111 LSmith's Truck Pics	Thanks for the info!! __________________ 2007.5 2500 4X4 Quad Cab 6.7L Len

07-01-2008, 11:32 AM	#31 (permalink)
Shibbyutman Diesel Head Join Date: Sep 2006 Location: Superior Township, Michigan Posts: 1,275 Shibbyutman's Truck Pics	Exactly, now you know why there is no code free delete yet... __________________ 2003 Dodge Ram 2500 4X4, Banks Big Hoss Bundle, K&N FIPK, 5" Turbo back Expand-It exhaust, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.ABS Brake Specialist-You've got questions, I've got answers.

07-01-2008, 05:00 PM	#32 (permalink)
LSmith Cummins Fanatic Join Date: Jun 2008 Location: Alabama Posts: 111 LSmith's Truck Pics	I understand all of that, but position wise there is a point where the valve is closed, whatever the 1's and 0's are. And I'm not suggesting code free. I just want to figure out the combination to those 6 wires to keep the valve shut, from an external source. If the ECM sees it can't control the valve, but it knows it's position, logically it would respond with all of the other variables to allow the engine to run. Yes, it will set a code because it can't control the valve, but the code "shouldn't" be more severe than unplugging the EGR valve all together. It may not work, but I won't know if I don't try! __________________ 2007.5 2500 4X4 Quad Cab 6.7L Len

07-01-2008, 06:32 PM	#33 (permalink)
Shibbyutman Diesel Head Join Date: Sep 2006 Location: Superior Township, Michigan Posts: 1,275 Shibbyutman's Truck Pics	If you have some way of making a PWM signal of approximately 80% duty cycle you can apply that 12v signal to pin 6 and 7 and make 8 to ground that would get you pretty close from what I have seen. The stepper motor appears to be powered througout operation of the engine to prevent just what we have said here, shifting from boost. It is these PWM signals that maintain a little force on the valve and allow it to remain closed. __________________ 2003 Dodge Ram 2500 4X4, Banks Big Hoss Bundle, K&N FIPK, 5" Turbo back Expand-It exhaust, Goerend Full Built Trans, Smarty REVO, DIY Fuel Control Actuator Mod, FASS 150/150 and custom big line kit.ABS Brake Specialist-You've got questions, I've got answers.

07-01-2008, 08:05 PM	#34 (permalink)
LSmith Cummins Fanatic Join Date: Jun 2008 Location: Alabama Posts: 111 LSmith's Truck Pics	12 Volt DC PWM -- that may be a little difficult......... If we knew the current draw required, you could size a diode to shunt the voltage spike. Then you could just send it a 12VDC signal. May be more trouble than it's worth... __________________ 2007.5 2500 4X4 Quad Cab 6.7L Len Last edited by LSmith : 07-01-2008 at 08:23 PM.