Question about 2002 Saturn L-Series

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2002 Saturn L300, engine starts but only idles. Will not respond to throttle movement. Also get "reduced power" light on intrument panel as well as a P1516 code (Electronic Throttle Module). Do I just need to replace the throttle module at the throttle body? I'm also getting a P2105 but according to Saturn, it doesn't exist. A U2105 (communication error) does however, and I'm wondering if my reader just got the prefix code wrong.

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  • T38tester Nov 16, 2009

    Thanks Taran,



    It's funny you mention the transmission....there is another code, P1780 (Park/Neutral Position Switch Circuit) that I'm also getting. I didn't think it had anything to do with why it wouldn't run but maybe that is why I'm getting the P2105...

  • T38tester Nov 16, 2009

    Taran,

    I don't have a lb scope, is there any other way to check the signal?

  • T38tester Nov 16, 2009

    Yes

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Hi,

P1516

Tests/Procedures:

1. Clear code and start engine, if code does not reset stroke accelerator pedal to rev engine and see if code resets.

2. If code sets, lab scope the 2 Throttle Position Sensor (TPS) circuits on the throttle body (Purple wire pin D and Dark Green wire pin A) with a lab scope looking for glitches or drop outs as open the throttle plate. If there is no voltage check for the wire being shorted to ground.

3. Verify the Black and Black/White wires are good grounds and the Light Blue/Black and Gray wires have 5 volts.

4. Replace throttle body assembly if wiring is OK but sensors have glitch or drop out.


Potential Causes:
Accelerator Pedal Position (APP) Sensor
Throttle Body Module
Wiring Harness

P2105 does exist. However, it could be due to many reasons. Usually i have seen whenever there is a transmission problem. So, the first step would be to fix P1516.

For more information on U2105, read :-

Power Steering Warning Message on DIC with DTC U2105 and/or U2107 in the PSCM with any other U codes

Although the code(s) appear in the PSCM, these are communication codes and are not the result of a problem with the column operation or the control module. If the codes are in history, clear the codes and re-key the vehicle a few times to see if they come back. If they reappear, look for a communication issue from the BCM U2107 or ECM U2105 (wiring, connector, etc.) as the root cause. If the codes do not reappear after a test drive, return the vehicle back to the customer.

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Nov 16, 2009

  • taran_2005
    taran_2005 Nov 16, 2009

    Thanks for your response!!

    Well first, the p1780 code indicates a problem in the transmission or the communication lines between the body control module and the engine control module...If the transmission had a true fault of this type in it, it would not cause the engine to shut down.

    The most likely cause is that there was a glitch between the operating computers.



    Now, with that being said, My best advise is to talk to your local Saturn dealer and have them take a look at it...I would love to give you more information but, with it now starting all the information(system sensor values) need to be viewed through a Saturn scan tool.



    My concern is that the system will fail again...In most cases, the failure will show back up.


    Let me know, if needed further assistance.

    Hope i helped you.

    Thanks for using ' Fixya ' and have a nice day!!

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If you would like help we would need the DTC - diagnostic trouble code .Is their a Reduced Engine Power Mode message showing on the instrument cluster ?
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Have the vehicle checked for DTC'S - diagnostic trouble codes ! Do you know what electronic throttle control is ? The gas pedal assembly has electrical connector an sensors inside ,hooked to the PCM / ECM - engine computer . The engine computer uses these position sensors inputs to control the DC motor on the throttle body to open the throttle plate to control the speed . Plus there are position sensors inside the throttle body to input PCM/ECM to see if it's calculations are corect . Your best bet maybe to take it to a qualified repair shop .
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