Stock ECU Question

[BongRips]

So I just took my ECU out to get it chipped and I noticed a small dial on the back of it. Obviously it's Jap writing all around it so I don't understand what it says. Does anyone know what this dial does?

[trickey1991]

SUPPOSIBLY its for reading the fault codes on the ecu ...turn it all the way clockwise with ignition on then turn it anti clockwise this will put it into mode 2 the light will flash count the flashes they will be slow for first digit then they will flash fast this will be the second digit
all skylines have them some have 1 led some have 2

[bellis_GTR]

I heard storys like this before and they said its 2 settings for the ecu. I forget the rest lol

[trickey1991]

-remove the three bolts securing the ECU to the bulkhead, floor and lower dash -carefully wiggle the ecu from it's position -don't damage the wiring harness

-turn the ecu around --the face farthest from the wires has a small dial and a LED --( later models have 2 led's)

-find a screwdriver small enough to turn the small dial...

-turn the ignition on ( but don't start the engine )

-the red LED will start to glow...

-CAREFULLY turn the small dial CLOCKWISE fully...

-the LED will go off...

-then turn the LED fully anticlockwise...

-the LED will start to flash...

-long flashes then short, repeatedly, until you switch off the ignition or start the car --if the sequence is five long then five short flashes, the code is 55, which means all is OK --3 long then 4 short means a faulty knock sensor, etc (see codes below).

you want a "55" = ok.

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

[PrNsOwn04]

http://www.skyline-owners-club.com/forums/17479-ecu-diagnostic-mode-explained.html

[nickdutch]

ha good to know this should be stickyed

[PrNsOwn04]

I'm pretty sure it is I can't remember where I found the link though thanks for the fmic btw nickdutch!!

[BongRips]

Oh ok. Thanks a lot! So if my car's not popping up an engine code the code that the ecu should throw off should be 55 right? And I'm getting a consult cable today and was wondering if that would be able to read all the fault codes that the ecu test does?