2g Engine Bay Electrical Connections

Posted by snowborder714, Jun 13, 2008

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  1. snowborder714

    snowborder714 Moderator

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    This article is designed to help 2g owners identify all the plugs in the engine bay. The photos and wire colors were based off of a 1999 Eclipse GSX, so other years and models may vary in location and wire color.

    I would like to give a HUGE thanks to turbosax2 for helping with the photography and the documentation for the article!!

    The way the tech article will be set up will be as follows:

    This post will have the master list of all the connectors. Each connector will then have it's own separate post below which will contain a little description and a few pictures and diagrams. The first picture will be an overview shot to show the general location of the plug. The plug will be circled in green. The next picture will show the plug itself. Following that will be a picture of the back of the plug to show how the wires are inserted into the plug as well as wire color. And lastly will be a diagram showing the arrangement/layout of the wires as well as the wire colors. These diagrams will always be viewed when looking at the back of the plug with the clip (the part that holds the plug in) on the top.

    Some descriptions will come from the service manual and others from Virtual Tour of the DSM Engine Bay - Quadrant map.

    Master List
    1. Manifold Differential Pressure (MDP) Sensor
    2. Fuel Injector 1
    3. Fuel Injector 2
    4. Fuel Injector 3
    5. Fuel Injector 4
    6. Ignition Coil (Coil Pack)
    7. Ignition Power Transistor
    8. Throttle Position Sensor (TPS)
    9. Knock Sensor
    10. Camshaft Position Sensor
    11. Auto-Cruise Control Vacuum Pump (Cruise Control Actuator)
    12. Volume Airflow Sensor [Mass Airflow Sensor (MAS)]
    13. Fuel Pressure Solenoid (FPS) Valve
    14. Exhaust Gas Recirculation (EGR) Control Solenoid
    15. Condenser Fan Motor [Air Conditioning (A/C) Fan]
    16. Brake Fluid Level Switch
    17. Radiator Fan Motor [Main Fan]
    18. Hood Switch
    19. Dual Pressure Switch (AC)
    20. Capacitor (Noise Condenser)
    21. Left Headlight
    22. Left Combination Light (Parking)
    23. Left Side Marker
    24. Right Headlight
    25. Right Combination Light (Parking)
    26. Right Side Marker
    27. Evaporative Purge Solenoid
    28. Theft Alarm Horn
    29. Idle Air Control Motor (ISC, IAC)
    30. Turbocharger Waste Gate Solenoid Valve [Boost Control Solenoid (BCS)]
    31. Back-up Light Switch
    32. Front Wiring Harness and Control Wiring Harness Combination
    33. Evaporative Purge Solenoid to ECU Harness Connector
    34. Crankshaft Position Sensor (CPS)
    35. EVAP Emission Purge Control Solenoid Valve
    36. Air Conditioning (A/C) Compressor
    37. Engine Coolant Temperature Gauge Unit
    38. Engine Coolant Temperature Sensor
    39. Heated Oxygen Sensor (Front O2 Sensor)
    40. Starter Solenoid
    41. Vehicle Speed Sensor (VSS)
    42. Positive Battery Cable/Starter Motor
    43. Left Fog Light
    44. Right Fog Light
    45. Generator (Alternator Power)
    46. Generator (Alternator)
    47. Power Steering Pressure Switch
    48. Horn
    49. Oil Pressure Switch (Dummy Light)
    50. Oil Pressure Gauge Unit
    51. Ignition Suppression Resistor (Fuel Injector Resistor Box)
    52. Engine Speed Detection Connector
    53. Windshield Wiper Motor
    54. ABS Hydraulic Brake Unit
    55. Left ABS Sensor
    56. Right ABS Sensor

    Wire Color Key
    B = Black
    Lg = Light green
    Sb = Sky blue
    V = Violet
    O = Orange
    Y = Yellow
    Br = Brown
    G = Green
    Gr = Gray
    L = Blue
    P = Pink
    R = Red
    W = White


    Here's an example on how to read the diagrams.

    IMG_5268 (Medium).jpg

    2 Fuel Injector 1.jpg

    If you look at the picture, you'll notice there is 2 wires coming out the back of the connector. The diagram has 2 boxes that contain letters from the color code list above. The first box contains RSb. The first letter is the main wire color - red. The second letter (if applicable) deals with the stripe color, which in this case is sky blue as you can see in the picture. The second box contains a G for green. There is no stripe on this wire. These diagrams only deal with main wire color and stripe color. Some of the diagrams contain blank boxes which just means there is no wire there.
     

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    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
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    Mello, Jst4Cyl, Malcalmstunt and 4 others like this.
  2. snowborder714

    snowborder714 Moderator

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    The MDP sensor measures the amount of vacuum in the intake manifold. It does not do this to measure the amount of air entering the engine. The MDP sensor measurement is instead used to monitor that the exhaust gas recirculation (EGR) emissions control system is working correctly. 1G cars used a temperature probe for this, while 2G cars use the MDP sensor. (from Virtual Tour website)

    1. MDP (Medium).jpg

    IMG_5252 (Medium).jpg

    This plug is held on by this little wire clip. Use a small pick or screw driver to pry the clip up. Once this is removed, then you can remove the plug.
    IMG_5255 (Medium).jpg

    IMG_5248 (Medium).JPG

    1 MDP.jpg


    http://www.newunitedracetech.com/sh...or-p-1381.html?cPath=1114_1145_1146_1147_1148
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
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  3. snowborder714

    snowborder714 Moderator

    11,905
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    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
  4. snowborder714

    snowborder714 Moderator

    11,905
    193
    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
  5. snowborder714

    snowborder714 Moderator

    11,905
    193
    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
  6. snowborder714

    snowborder714 Moderator

    11,905
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    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
  7. snowborder714

    snowborder714 Moderator

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    The engine control module controls the two ignition power transistors to turn them alternately ON and OFF. This causes the primary currents in the ignition coils to be alternately interrupted and allowed to flow to fire the cylinders in the order 1-3-4-2.(from service manual)

    7. Power Transistor (Medium).jpg

    IMG_5297 (Medium).jpg

    IMG_5295 (Medium).jpg

    7 Power Transistor.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
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  8. snowborder714

    snowborder714 Moderator

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    The TPS is connected to the throttle plate inside the throttle body. It provides an electrical signal that "tells" the engine control computer the throttle position. The ECU uses this information to help "decide" how much fuel to inject in to the engine. (from Virtual Tour website)

    *This plug also has the wire clip that holds it on (the same as the MDP sensor).*

    8. TPS (Medium).jpg

    IMG_5307 (Medium).jpg

    IMG_5305 (Medium).jpg

    8 TPS (Custom).jpg


    http://www.newunitedracetech.com/sh...tle-Position-Sensor-TPS-Connector-p-1388.html
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  9. snowborder714

    snowborder714 Moderator

    11,905
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    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  10. snowborder714

    snowborder714 Moderator

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    This is a very important component of the engine, since it "tells" the engine computer how much air is entering the cylinders. The MAS actually consists of three different sensors: air flow, air temperature, and barometric (atmospheric) pressure. (from Virtual Tour website)

    12. MAS (Medium).jpg

    IMG_5336 (Medium).jpg

    IMG_5333 (Medium).jpg

    12 MAS.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  11. snowborder714

    snowborder714 Moderator

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    This solenoid allows the engine control computer to temporarily raise the fuel pressure for hot starting purposes. This is accomplished by cutting off the vacuum hose going to the fuel pressure regulator

    It is not used for anything else, but it can provide a useful tap-in point for a boost gauge, since the regulator "sees" the intake manifold pressure. (from Virtual Tour website)

    13. FPS (Medium).jpg

    IMG_5341 (Medium).jpg

    IMG_5339 (Medium).jpg

    13 FPS.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  12. snowborder714

    snowborder714 Moderator

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    It controls the flow of exhaust gas through the exhaust gas recirculation valve - a valve that allows some exhaust gases to run back into the intake stream. This is purely for emissions purposes, as "reburning" some of the exhaust gas helps reduce emissions. (from Virtual Tour website)

    14. EGR Solenoid (Medium).jpg

    IMG_5345 (Medium).jpg

    IMG_5344 (Medium).jpg

    14 EGR Solenoid.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  13. snowborder714

    snowborder714 Moderator

    11,905
    193
    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
  14. snowborder714

    snowborder714 Moderator

    11,905
    193
    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
  15. snowborder714

    snowborder714 Moderator

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    20. Capacitor (Medium).jpg

    IMG_5387 (Medium).jpg

    IMG_5385 (Medium).jpg

    20 Radio Noise Filter.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  16. snowborder714

    snowborder714 Moderator

    11,905
    193
    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
    [​IMG]

    IMG_4039 (Medium).jpg

    IMG_4041 (Medium).JPG

    22 Left Combination Light.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...
  17. snowborder714

    snowborder714 Moderator

    11,905
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    Joined Oct 15, 2006
    Mechanicsburg, Pennsylvania
    23. Left Side Marker (Medium).jpg

    IMG_4045 (Medium).jpg

    IMG_4048 (Medium).jpg

    23 Left Side Marker.jpg
     
    Last edited by a moderator: Jul 10, 2014
    My DSM:
    1995 Mitsubishi Eclipse GST

    12.529 @ 110.820 MPH
    Loading...

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