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eng pwr reduced
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Shawn
Apr 16, 2015, 8:40:26 AM4/16/15
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I have a '07 Saturn Aura with 211K miles on it. I was driving on the highway earlier today with the cruise set on 70. Without warning the cruise disengaged, I heard a few "bongs," and my DIC was displaying ENG PWR REDUCED and SERVICE TRACTION (not sure if that's exact, but, it mentioned the traction). I noticed immediately that I only had about half of my usual acceleration. I pulled over, turned off the car, and waited a few seconds before restarting the engine. The same DIC messages appeared when I started the car again. I drove it the remaining 25 miles to work. When I got to work I shut it off and let it sit for about 10 minutes. I then started it back up and the messages didn't reappear.
I realize there are a great many things that can cause this condition. What's the best case scenario? What's the worst case scenario?
I realize there are a great many things that can cause this condition. What's the best case scenario? What's the worst case scenario?
Wordsworth
Apr 16, 2015, 5:39:22 PM4/16/15
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On Thu, 16 Apr 2015 05:40:25 -0700 (PDT), Shawn <shba...@gmail.com>
wrote:
>I have a '07 Saturn Aura with 211K miles on it. I was driving on the highway earlier today with the cruise set on 70. Without warning the cruise disengaged, I heard a few "bongs," and my DIC was displaying ENG PWR REDUCED and SERVICE TRACTION (not sure if that's exact, but, it mentioned the traction). I noticed immediately that I only had about half of my usual acceleration. I pulled over, turned off the car, and waited a few seconds before restarting the engine. The same DIC messages appeared when I started the car again. I drove it the remaining 25 miles to work. When I got to work I shut it off and let it sit for about 10 minutes. I then started it back up and the messages didn't reappear.
>
>I realize there are a great many things that can cause this condition. What's the best case scenario? What's the worst case scenario?
The traction control system usually used the ABS sensors to determine
the speed of each wheel. If the sensors get dirty enough, it screws
with the whole works, causing the control unit to think that one (or
more) of the wheels has lost traction. The computer then retards the
ignition timing to "reduce engine power" and regain traction.
I would suggest you start by cleaning the ABS sensors at all four
wheels.
wrote:
>I have a '07 Saturn Aura with 211K miles on it. I was driving on the highway earlier today with the cruise set on 70. Without warning the cruise disengaged, I heard a few "bongs," and my DIC was displaying ENG PWR REDUCED and SERVICE TRACTION (not sure if that's exact, but, it mentioned the traction). I noticed immediately that I only had about half of my usual acceleration. I pulled over, turned off the car, and waited a few seconds before restarting the engine. The same DIC messages appeared when I started the car again. I drove it the remaining 25 miles to work. When I got to work I shut it off and let it sit for about 10 minutes. I then started it back up and the messages didn't reappear.
>
>I realize there are a great many things that can cause this condition. What's the best case scenario? What's the worst case scenario?
the speed of each wheel. If the sensors get dirty enough, it screws
with the whole works, causing the control unit to think that one (or
more) of the wheels has lost traction. The computer then retards the
ignition timing to "reduce engine power" and regain traction.
I would suggest you start by cleaning the ABS sensors at all four
wheels.
Oppie
May 27, 2015, 8:27:14 PM5/27/15
to
Agreed. A diagnostic may show which sensor is giving the problem. Many of
these are magnetic sensors that sense something like gear teeth on the wheel
hubs. The sensors themselves can go bad or the teeth rust away and increase
the critical airgap.
"Reduced Power" usually happens when the ABS senses a wheel slip, ABS
control attempts to correct the slip by selective braking on wheels that are
travelling faster. If that fails to balance drive power, the engine power is
reduced. This either by direct throttle control in a drive by wire system or
by retarding the ignition in a mechanical throttle engine.
As normal operation returns after sitting for a while, problem is likely
heat related.
"Wordsworth" <us...@domain.org> wrote in message
news:rpa0jal7pen59isd6...@4ax.com...
these are magnetic sensors that sense something like gear teeth on the wheel
hubs. The sensors themselves can go bad or the teeth rust away and increase
the critical airgap.
"Reduced Power" usually happens when the ABS senses a wheel slip, ABS
control attempts to correct the slip by selective braking on wheels that are
travelling faster. If that fails to balance drive power, the engine power is
reduced. This either by direct throttle control in a drive by wire system or
by retarding the ignition in a mechanical throttle engine.
As normal operation returns after sitting for a while, problem is likely
heat related.
"Wordsworth" <us...@domain.org> wrote in message
news:rpa0jal7pen59isd6...@4ax.com...
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