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Engine power loss message

Get an engine power loss message on a 2003 oldmobile bravada. Loses power, can't accelerate. Turn off and restart, runs fine for a little while then does it again.

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  • Cars & Trucks Master
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You need to have it checked for DTC'S - diagnostic trouble codes , There is a problem with throttle actuator control (TAC) - electronic throttle control !
Throttle Actuator Control (TAC) Overview
The throttle actuator control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. This eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions as well.
The TAC system components include, but are not limited to the following:
?€¢
The accelerator pedal position (APP) sensors

?€¢
The throttle body

?€¢
The powertrain control module (PCM)
Each of these components interface together to ensure accurate calculations and control of the throttle position (TP).


Drive by Wire Function and Diagnostics by Wells

Posted on Mar 29, 2015

  • 8 more comments 
  • Fred Smith
    Fred Smith Mar 29, 2015

    Think you may have nailed it Jeff. The codes are P0495 (High Speed Fan) and P1221 (Throttle position Sensor). What would be the easiest/cheapest way to figure out the culprit?

  • Jeff Armer Mar 29, 2015

    If you tell me your email , I'd send you the gm diagnostic flow chart on how to test it but you need a scan tool !

  • Jeff Armer Mar 29, 2015

    The throttle actuator control assembly has two throttle position (TP) sensors mounted within the assembly. The powertrain control module (PCM) provides individual signal, ground, and 5-volt reference circuits to each sensor. Both sensors operate within a voltage range between 0.35-4.65 volts. When the throttle is opened from 0 to 100 percent, one sensor signal voltage increases while the other decreases. The signal circuit for TP sensor 1 is referenced to ground, and the signal circuit for TP sensor 2 is pulled up to 5 volts within the PCM.

  • Fred Smith
    Fred Smith Mar 29, 2015

    Only have an Actron CP9180. But, idon't believe that is what you are referring to. email is smittyjack77@gmail.com

  • Jeff Armer Mar 29, 2015

    You can check with a dvom - digital volt ohm meter ! Action Taken When the DTC Sets • The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. • The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or the Failure Records. • The control module commands the TAC system to operate in the Reduced Engine Power mode. • A message center or an indicator displays Reduced Engine Power. • Under certain conditions the control module commands the engine OFF.

  • Fred Smith
    Fred Smith Mar 29, 2015

    Ok. I have a meter.

  • Fred Smith
    Fred Smith Mar 29, 2015

    so, basically just looking for one of those sensors to be erratic or not react at all. Is that correct?

  • Jeff Armer Mar 29, 2015

    Yep, pretty much ! you'll see the voltage's on the diagnostic flow chart I sent ! let me know if you get it !

  • Fred Smith
    Fred Smith Mar 29, 2015

    Will do. Thanks again!

  • Randy Ohler Mar 29, 2015

    Good answer and flow of diagnoses Jeff.

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You may just need a tune up
but if the MIL in on you have to check that and go from there (Malfunction Indicator Lamp)

Posted on Mar 29, 2015

  • Jeff Armer Mar 29, 2015

    It has nothing to do with needing a tune - up

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  • Cars & Trucks Master
  • 380 Answers

Could be clogged catalytic converter.

Posted on Mar 29, 2015

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http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

-----------
Acceleration lag problem?

http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html

--------------
How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

-----------


How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

----------
accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

----------
stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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http://technoanswers.blogspot.in/2012/02/engine-accelerates-when-brake-is.html

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http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html

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How exactly the Vehicles Accelerator Cable works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html

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How exactly Vehicles Accelerator Pump Diaphragm Works?

http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html

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accelerator pedal sensor?

http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html

-------
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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

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This will help.

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