Question about GMC Jimmy

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EVERY TIME I ASK A PART STORE FOR AN E.M.C. COMPUTER FOR MY 1999 GMC JIMMY THEY WANT TO GIVE ME AN ECM, OR A MAP SENSOR, SO...MAY I ASK, WHAT DOES E.M.C. STAND FOR AND WHAT DOES IT DO?

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EMC, no that should be a PCM (Powertrain Control Module), that is what you need,there is no EMC computer on this truck you have your terminology wrong, the PCM controls all engine functions as wellas the Emission control system.

Posted on Jul 29, 2010

  • 6 more comments 
  • im4thedogs Jul 29, 2010

    Is there a way you can access my prior submissions to see where I got this terminology, and why I would have gotten this info? I realy need help and now I'm realy confused.

  • yadayada
    yadayada Jul 29, 2010

    I am sorry but there is no way i can see what u have written previous to this problem post, there is no module in the truck called the"EMC" that I know for sure

  • im4thedogs Jul 30, 2010

    So... my origanal post was -----My jimmy dies in extream heat stop and go traffic (above 95 F) we have replaced the fuel pump, egr valve, distributer, spark plugs, icm & coil packs, fuel pump relay, the little girl still dies and sets a code: misfire on #6 cylinder. any ideas what else it could be? 4 mech. working on this no luck on my end.

  • im4thedogs Jul 30, 2010

    oh, and I can't start her for 8-10 hours, When the weather isn't so hot, she doesn't die, And another guru said this computer I need was also located next to the washer fluid resevior..?

  • yadayada
    yadayada Jul 30, 2010

    the chances that the computer is causing this are very slim, what testing have u done, do u have any fault codes stored in the PCM's memeory?

  • im4thedogs Jul 30, 2010

    the only code setting is a misfired on #6. other than that no other codes have set.

  • im4thedogs Jul 30, 2010

    P0306

  • yadayada
    yadayada Jul 30, 2010

    address the engine misfire in #6, that may be the source of the stall.

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check make sure you have 5 volts at crank sensor with ignition sw. on. if voltage is not present then check power to your ecm. you need to back probe ecm pin the check power source at ecm. ALL DATA.COM is a good source you need to pay to get the data you need.

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When I try to excellerate I can only give it half pedal or it starts to stall and backfire


Hi, you might want to test your MAP sensor. Sensor is used to richen mixture during acceleration. Affects timing as well--thus backfires when malfunction. This should be putting your engine light on--isn't it? See instructions below from autozone.com. A new sensor is $47 at autozone. Let me know if you have questions and thanks for using FixYa.


jturcotte_765.gifjturcotte_123.jpg

Fig. Fig. 1: Typical Manifold Absolute Pressure (MAP) sensor wiring diagram (wire color, terminal identification/location may vary on certain models)

  1. Backprobe with a high impedance voltmeter at MAP sensor terminals A and C .
  2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
  3. If the voltage is not as specified, either the wiring to the MAP sensor or the VCM may be faulty. Correct any wiring or VCM faults before continuing test.
  4. Backprobe with the high impedance voltmeter at MAP sensor terminals B and A .
  5. Verify that the sensor voltage is approximately 0.5 volts with the engine not running (at sea level).
  6. Record MAP sensor voltage with the key ON and engine off.
  7. Start the vehicle.
  8. Verify that the sensor voltage is greater than 1.5 volts (above the recorded reading) at idle.
  9. Verify that the sensor voltage increases to approximately 4.5. volts (above the recorded reading) at Wide Open Throttle (WOT).
  10. If the sensor voltage is as specified, the sensor is functioning properly.
  11. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be defective and should be replaced.
ECM pinouts for 99 Jimmy:
    jturcotte_766.gif

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1 Answer

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