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ECU diagnostics The ECU is found in the passenger footwell, behind the plastic kickplate to the left of your feet when sitting. Usually you have to remove the computer from the mounts in the footwell, as the LED(s) you need to see is pointing away from you. Switch on the ignition, but don't start. The LED on the ECU will be glowing. Turn the selector screw clockwise all the way (gently!) If your ECU doesn't have a diagnostic mode screw, use the diagnostic connector to enter the diagnostics mode. ________________________________________________________________ There are three different types of factory ECU available in Skylines. One type has two LEDs and five modes The second type has no LED's. The error codes are flashed with the engine check light in the instrument cluster. The other type has one LED and two modes ________________________________________________________________ For two LED EDU's: the LED will flash once, pause, flash twice, pause... all the way up to five. This is the diagnostic mode. Mode 1 = one flash, mode 5 = five flashes. When you reach the right mode, turn the screw back counter-clockwise. Mode 3 is what most people use. For one LED ECU's: wait a couple of seconds, and turn the screw back counter-clockwise, the ECU is now in mode 2. Note - the engine check light on the dash will mirror the LED on the computer. The LED will flash out a code (or series of codes if there is more than one fault) More recent ECU's have two LED's (red = first digit, green = second digit, eg red 2x flash, green 1x flash = code 21) The ECU's on most R32's have one LED, long flash = first digit, short flash = second digit, eg long, long, short = code 21. Codes: 11 Crankshaft position sensor 12 MAF sensor circuit 13 Coolent temperature circuit 14 Vehicle speed sensor circuit 21 Ignition circuit 31 ECU (ouch!) 34 Knock sensor 43 Throttle position circuit 45 Injector leak 51 Ignition circuit 54 Auto signal to ECU 55 All OK Turn the ignition off to put the ECU back to normal. There is also a O2 sensor test in real time available - do the above to get the ECU into mode 2 (single LED ECU) or mode 1 (2 LED ECU's) Start the engine. Warm the engine, and then run under no load at 2000 rpm for the test. Single LEDs: on = lean, off = rich Dual LED's: green LED on = lean, green LED off = rich Go by the trend shown, eg mostly on = lean, mostly off = rich. The LED should be flashing between 5-10 times per 10 seconds under normal conditions.

Check your firing amplifier and all your coils sound like one of it is bad. If nor check TVP sensor it could be bad..

Check your firing amplifier and your coil. Your car sound like losing electricity.