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STP wire from ecu question

Discussion in 'Electronics' started by ST185GT, Jul 5, 2011.

  1. ST185GT

    ST185GT Member

    On the ST185 ecu, it has a single STP wire that needs to be connected to the stop light switch via the brake master cylinder. Why does the ecu need to know when its braking? ABS? or for backing off fuel maps etc?????
     
  2. fernandocelica

    fernandocelica Well-Known Member Donated!

    I think you right it's got to do with both and maybe more
     
  3. ST185GT

    ST185GT Member

    wow, how precise and technical are these ecu's.
     
  4. fernandocelica

    fernandocelica Well-Known Member Donated!

    that's why they still on the market till today.computers my man the best thing ever happen'd in our life's
     
  5. fernandocelica

    fernandocelica Well-Known Member Donated!

    st185 there's your info.look up stp you are mate.
    Abbreviation Wire colour Means... What does it do? Anything else?
    E01 White/Black Earth Attached to engine block
    ISC-1 Green/White Idle Stabilisation Control Opens a valve below the throttle body to control the idle speed rpm
    STA Black Starting signal 12V fed to the ECU whilst the car is trying to start
    STJ Green Cold start injector Signal to control the 5th injector when starting the car
    #1 Red/Black Injector signal Fires No 1 fuel injector
    #2 Light Green Injector signal Fires No 2 fuel injector
    G- Red Distributor signals Ground for G1, G2 and NE
    G1 Dark Green Distributor signals Sends crankshaft angle information Allows ECU to determine the position of each piston, adjust injector and ignition timing
    G2 White Distributor signals Sends crankshaft angle information As above, but 180o out from G1
    NE Black Engine rpm signal Sends the engine speed and crankshaft angle to the ECU Positive signal from 24 tooth sensor
    FPR Blue/Red Fuel Pump Relay Clicks on the fuel relay when you turn the ignition key If it doesn't activate the fuel relay the car won't start
    IGF White/Red Spark confirmation signal Used to detect a fault within the igniter
    THW Red Water temperature sensor Informs ECU of water temperature Probably used to correct fuel and ignition maps
    WIN Light Green/Black Intercooler computer signal Error reporting?
    TPC Black/White TVSV signal Allows extra boost in 3+ gears ~2psi Don't cut this wire, pull the pipe off from the wastegate actuator instead!
    SPD Blue/White Speed sensor Monitors car speed
    STP Green/White Stop light switch Monitors the brake light switch To inform the ECU when braking, to apply deceleration fuel cut
    THA Grey AFM air intake temp Tells the ECU the temp of the incoming air
    VS Grey/Black AFM signal Stopped - idle signal
    VC Pink/Blue AFM signal Variable - flap position signal
    BATT Pink Battery supply Supplies power to ECU via the 15A engine bay fuse Permanent 12V feed to the battery even when the ignition is off
    ELS Orange Electrical idle up Increases idle speed due to large current drawn by headlights and demister
     
  6. jwagner162

    jwagner162 Well-Known Member Donated!

    -is that correct? if it applied a decel fuel cut how would you heel toe? i would think the ecu would only be monitering engine sensors to determine fuel. e.g. afm, tps, o2, water temp sensors, ect. turbo should have more? but i dont think braking should have any effect on fueling.

    -i belive on the 162s the ecu just moniters brake fluid level. if its low it kicks the e-brake "BRAKE" light on.

    -i have been wrong before thou.
     
  7. fernandocelica

    fernandocelica Well-Known Member Donated!

    Stp yes that's proof from toyota bro it really does.
     
  8. ST185GT

    ST185GT Member

    its weird how the plug is plugged onto the break booster, and not the brake switch on the brake pedal inside the car.
     
  9. Stig

    Stig ST162 Guru Donated!

    My guess it monitors servo vaccum, which would answer both your and #09's heel/toe questions
     
  10. Mafix

    Mafix Owner Staff Member Administrator Donated!

    the STP pin controls the idle. if you are on the brakes at idle the ecu bumps it up a little to compensate. that's all it does.
     

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