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Discussion Starter #1
am working at my car at the min and want to do a fault code check my ecu has no led s i have looked in the faq sec and dont no how to do a fault code check on mine i may have missed something being stupied (most likely)

can someone put me right please..:spank:
 

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your right no leds on some ecus, Mine is the same.

You can use a consult cable to access the codes or the engine management light on the dash is used instead. Not sure of the procedure though.

Mine does not have the light on dash so i gave up!
 

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Discussion Starter #3
your right no leds on some ecus, Mine is the same.

You can use a consult cable to access the codes or the engine management light on the dash is used instead. Not sure of the procedure though.

Mine does not have the light on dash so i gave up!
i have the light ok but dont know the procedure please help sumone:attention:
 

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Would help to know specific model / type

Aitch
 

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search for hessitating and look for thread hessitating but coils seem ok,by me there are links on here look for the one relating to ecu checks this will help.
 

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To make it even easier on you:

----------------------------------------
ECU Diagnostics
----------------------------------------
Usually you have to remove the computer from the mounts in
the passenger foot-well, as the LED(s) you need to see is
pointing away from you.
Remove the plastic panel to gain access to the ECU.
There are three different types of factory ECU
available in Skylines.
One type has two LEDs and five modes
The second type has one LED and two modes
The last type has no LEDs, the output is done with
the engine check light in the instrument cluster. Acts
as a single LED ECU.

1, Switch on the ignition, but don't start. The LED on the ECU will
be glowing.
2, Turn the selector screw clockwise all the way (gently!)

3a, For two LED ECU'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.
3b, For single LED ECU's: wait a couple of seconds, and turn the screw
back counter clockwise, the ECU is now in mode 2.

4, 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) The ECU will keep error codes in memory for
50 starts, so keep in mind if an error happened 51 starts ago,
here will be no record of it in the ECU.
More recent ECU's have two LED's
(red = first digit, green = second digit, for example,
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, for example, long, long, short = code 21.
Note the ECU fitted to R31 Skylines has a smaller subset of the codes,
and the code for all OK is 44 on the R31 ECU. The R30 Skyline has a
totally different ECU.


ECU Diagnostic Codes
11 Crankshaft position sensor
12 MAF sensor circuit (air flow meter)
13 Coolant 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.

***This was originaly posted by Freakyclown on FAQ***
 
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