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*INFO* Checking your Skyline for its ecu fault Codes

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  • *INFO* Checking your Skyline for its ecu fault Codes

    Here is some info on checking your ecu for fault codes if you are having any problems with them.

    This is for nissans from 1988-1994, altough i think its the same for 1994 models and up

    The ECU is located on the passenger side, in the side panel beside your left foot when you are seated in the car.

    ECCS has 5 modes :

    Mode 1 - Exhaust Gas Sensor monitor.

    When the engine is warm (closed loop) the green led turns on for lean, off for rich. It should alternate. When it is cold (open loop) it will be either on or off.

    Mode 2 - Mixture ratio feedback control monitor.

    During closed loop operation the red led should turn on and off simultaneously with the green led when the mixture is controlled within the specified values. During open loop the red led stays on or off.

    Mode 3 - Self Diagnosis. See below

    Mode 4 - Switches On/Off diagnosis.

    The inspection lamp monitors the idle switch portion of the throttle valve switch, the starter switch, vehicle speed sensor an other switches with an on/off condition.

    Mode 5 - Real Time diagnosis.

    Same as Mode 3, but it flashes the errors as they occur.

    To select the various modes :

    http://tinypic.com/4t10dc

    With the ignition ON take a small screwdriver and turn it clockwise. the LED's will flash together, first once, then pause, then twice, then pause, then three times. When this happens turn the screwdriver counter clockwise. The ECU is now in mode 3 which reads out the fault codes on the LED's. It will cycle through all stored fault codes.

    Red LED = 10
    Green = 1

    If the red led flashes 4 times and the green one flashes 5 times that means you have code 45. It will repeat this if this is the only fault. If there are more faults it will flash all the faults and repeat.

    The ECU will reset when you turn the ignition off.

    11 - Crank Angle Sensor/Camshaft Position Sensor
    12 - Air Flow Meter
    13 - Engine Coolant Temperature Sensor
    14 - Vehicle Speed Sensor
    21 - Ignition Signal
    22 - Fuel Pump
    23 - Idle Switch
    24 - Throttle Valve Switch
    25 - Idle Speed Control Valve
    26 - Boost Pressure Sensor
    27 -
    28 - Cooling Fan Circuit
    29 -
    30 -
    31 - ECM
    32 - EGR Function
    33 - Heated Oxygen Sensor
    34 - Knock Sensor
    35 - Exhaust Gas Temperature Sensor
    36 - EGR Control-Back Pressure Transducer
    37 - Knock Sensor
    38 - Right hand bank Closed Loop (B2)
    41 - Intake Air Temperature Sensor
    42 - Fuel Temperature Sensor
    43 - Throttle Position Sensor
    45 - Injector Leak
    47 - Crankshaft Position Sensor
    51 - Injector Circuit
    53 - Oxygen Sensor
    54 - A/T Control
    55 - No Malfunction
    63 - No. 6 Cylinder Misfire
    64 - No. 5 Cylinder Misfire
    65 - No. 4 Cylinder Misfire
    66 - No. 3 Cylinder Misfire
    67 - No. 2 Cylinder Misfire
    68 - No. 1 Cylinder Misfire
    71 - Random Misfire
    72 - TWC Function right hand bank
    76 - Fuel Injection System Function right hand bank
    77 - Rear Heated Oxygen Sensor Circuit
    82 - Crankshaft Position Sensor
    84 - Automatic Transmission Diagnostic Communication Line
    87 - Canister Control Solenoid Valve Circuit
    91 - Front Heated Oxygen Sensor Heater Circuit right hand bank
    94 - TCC Solenoid Valve
    95 - Crank Position Cog
    98 - Engine Coolant Temperature Sensor
    101 - Front Heated Oxygen Sensor Heater Circuit right hand bank
    103 - Park/Neutral Position Switch Circuit
    105 - EGR and EGR Canister Control Solenoid Valve Circuit
    108 - Canister Purge Control Valve Circuit
    111 - Inhibitor Switch
    112 - Automatic Transmission Speed Sensor
    113 - Automatic Transmission 1st Signal
    114 - Automatic Transmission 2nd Signal
    115 - Automatic Transmission 3rd Signal
    116 - Automatic Transmission 4th Signal
    118 - Automatic Transmission Shift Solenoid Valve A
    121 - Automatic Transmission Shift Solenoid Valve B
    123 - Automatic Transmission Overrun Clutch Solenoid Valve
    124 - Automatic Transmission TOR Conv Solenoid Valve
    125 - Automatic Transmission Line Pressure Solenoid
    126 - Automatic Transmission Throttle Position Sensor
    127 - Automatic Transmission Engine Speed Signal
    128 - Automatic Transmission Fluid Temperature Sensor

    Thanks for looking,


    www.TyeeImports.com
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    DL#30562
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  • #2
    Excellent info, thanks. Stickying 8)
    marginally literate keyboard warrior

    Comment


    • #3
      Where did you get this info from?
      According to alldata, and personally having extract diagnostic trouble codes from the ECU on my gt-r, there is only 1 green LED and 2 operating modes- check engine lamp self test, and self-diagnostic mode.

      The trouble codes are the same for all nissans i believe.

      Comment


      • #4
        i just took the kick panel off and exposed my ECU, and there is no LED that i can see on it. is it hiding somewhere around the area, or is it on the ECU itself?

        Comment


        • #5
          There is a small hole next to the diagnostic screw. In this hole you'll find the Leds.
          Chich

          Comment


          • #6
            i have a 95 gtst and mines not under the right foot kick panel. i looked in the trunk where someone else said to look and on the top under by the speakers theres a metal type box that looks like it is the ecu but theres no markings on it. is this it?

            Comment


            • #7
              Originally posted by r33skyline24 View Post
              i have a 95 gtst and mines not under the right foot kick panel. i looked in the trunk where someone else said to look and on the top under by the speakers theres a metal type box that looks like it is the ecu but theres no markings on it. is this it?
              left foot panel passenger side, the one in the trunk is another controller
              understeer -is when you go off the road and see the tree that kills you
              oversteer-is when you go off the road backwards and dont see the tree that kills you

              Comment


              • #8
                thanks, i thought they meant the driver.

                Comment


                • #9
                  the one in the trunk is the hicas controller
                  understeer -is when you go off the road and see the tree that kills you
                  oversteer-is when you go off the road backwards and dont see the tree that kills you

                  Comment


                  • #10
                    Originally posted by anthony View Post
                    the one in the trunk is the hicas controller
                    R33 ATTESA ECU - the Hicas ECU is above it.

                    http://gtrusa.blogspot.com/2007/11/r...-location.html

                    R32 ATTESA codes

                    http://gtrusa.blogspot.com/2007/12/n...esa-codes.html
                    Sean Morris



                    Comment


                    • #11
                      The picture is gone, I need the picture...

                      I don't know what screw to turn, where the screw is, nothing like that at all...

                      Comment


                      • #12
                        i only seem to have a red LED in my ECU it will flash 4 then 1, but will not go into diagnostic mode as it should according to this thread. and it will only flash when the screw is counter clockwise of about half.

                        Comment


                        • #13
                          There's only one screw on the back of the ECU. There's also a single red LED on that same side of the box.

                          An error code of 41 would have 4 long flashes, followed by 1 short flash. Then a pause, and it will repeat. If there is more than one error code, they will all be displayed, and then a pause, and repeat.
                          Dan Hofman
                          DnA Garage - the performance gene
                          www.dnagarage.ca

                          Comment


                          • #14
                            yeah i figured it out. my intake air temp sensor was unplugged (41) but with it conected i get a 55 (no errors) and the car still runs like complete ****, i'm going to try a vacuum leak test tomorrow.

                            Comment


                            • #15
                              how come i only have one red led on my ecu?

                              Comment

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