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Service engine light

Discussion in 'The Garage' started by Robert D, Oct 10, 2005.

  1. Robert D

    Robert D 1/2 ton status

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    So what is the deal with the 'service engine soon' light? Is this an emissions check light, or does it trigger when the oil is too low? It seems to come on and off intermittently. The oil level looks to be fine, so I'm not quite sure what the light means.
     
  2. k20

    k20 3/4 ton status

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    It doesnt mean the oil is low, it usually means some type of sensor is out of spec and needs replaced. Pull the codes on it and see what codes it has stored. Autozone can do it for you, or if you make a paperclip into a U shape, and plug it into the top 2 right ports, and switch the ign to run, it will flash the codes through the check engine light. It will flash 12 3 times, then any problem codes. When it starts flashing 12 again, any stored codes are finished.
     
  3. readymix

    readymix 3/4 ton status

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    SES light comes on when the computer detects that any given sensor is out of range. Could be anything really, from O2 sensor to the CTS, to the Knock Sensor or EGR system.....Check your codes and post up the results. On the OBD1 trucks it is as easy as jumping two contacts on the ALDL port and turning the key to "ON", then count the flashes of the light
     
  4. Robert D

    Robert D 1/2 ton status

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    Sweet, I will have to do this Wednesday. I'm a busy man for the next couple days. As long as it is just a sensor and not something which will serve to be catastrophic I can live with it!
     
  5. sweetk30

    sweetk30 professional hooker Premium Member

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    if its 96 and newer you need a scanner dont jump the pins like the 95 and older.
     
  6. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    The "MIL" (malfunction indicator lamp) will set if the emissions are 1.5 times or greater what they should be. What year is the truck?
     
  7. Robert D

    Robert D 1/2 ton status

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    91 GMC Jimmy 4WD.
     
  8. Robert D

    Robert D 1/2 ton status

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    Ports of the? And where is it? I can find these codes today after work, but where is the port I am supposed to jump? (91 GMC Jimmy 4x4)
     
  9. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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  10. Robert D

    Robert D 1/2 ton status

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    Thanks a lot!
     
  11. k20

    k20 3/4 ton status

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    Yeh I did leave out the little part about where to put the paperclip didnt I? :doah:
     

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