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1g Code Reader - CEL CODE READER

Posted by 93_tsi_fwd, Dec 28, 2008

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  1. 93_tsi_fwd

    93_tsi_fwd Proven Member

    Joined Dec 20, 2006
    San Jose, California
    This is a How-To on figuring out your Check engine light(CEL) for 1g.

    Volt Meter or LED

    Connect the positive of the volt meter or LED to pin #1 and the ground to #12 pin on the port. SEE PIC.

    After you got that done, turn your key to the ON position and watch the pulse.

    A long pulse counts as 10, a short pulse as 1.

    1 long pulse: Engine Control Unit ( ECU )

    pulses 1 by 1: Normal operation


    11. Oxygen Sensor

    12. Air Flow Sensor

    13. Intake Air Temperature Sensor

    14. Throttle Position Sensor

    15. Motor Position Sensor

    21. Engine Coolant Temperature Sensor

    22. Crank Angle Sensor

    23. No 1 Top dead center sensor

    24. Vehicle Speed Sensor (Reed Switch)

    25. Barometric Pressure Sensor

    31. Detonation Sensor

    36. Ignition Timing Adjustment Signal

    41. Fuel Injector

    42. Fuel Pump

    43. EGR (California) ((This is also a common code when the ecu capacitors have to be replaced.))

    44. Ignition Coil ((This is also a common code when the ecu capacitors have to be replaced.))

    If you have any questions, Please PM me.

    Attached Files:

    750  0

    1992 Mitsubishi Galant VR-4
    · Galant VR-4
    Sduncan9 and 9!'clipseDOHC like this.
  2. steve

    steve DSM Wiseman

    Joined Feb 3, 2002
    Boulder, Colorado
    If you use a LED you need a 12v one or a regular LED and a current limiting resistor (For a typical red LED with a 2v forward voltage drop, at 680 ohm 1/2 watt resistor should work). Pin 1 on the DLC is going to be the positive and pin 12 the ground.

    I like using a Radio Shack 12v Piezo Buzzer for the same reason you use the overrange on the DMM, it's easier to count the sound.

    Attached Files:

    Last edited: Jan 28, 2012

    57  2

    2008 Audi TT 3.2 Quattro Roadster
    awd · manual · Misc Vehicles

    28  4

    2002 Audi TT Quattro Roadster 225
    awd · manual · Misc Vehicles

    34  2

    1992 Dodge Stealth RT/TT
    awd · manual · 3000GT/Stealth

    4K  12

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM

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