Project fade to black- 1987 HR31 Skyline

31GUN · **Posted:** Thu Apr 01, 2010 11:08 pm

I have another ecu coming in about a week, so in the mean time I thought I would check some wiring and stuff.
first thing I found is that my old multi meter is giving false readings.

One of the leads is faulty so tomorrow I'm of to buy a new one (everything is closed today, Easter Saturday)

I have an ECU for an earlier model NICS red rocker cover RB20DET.
All the plugs fit, so I wondered if it would start the car.
Answers no. It won't start the fuel pump.
so I thought I'd better check the current ECU to see if there was anything obvious, and because it look like it got a bit wet at some stage.

Here it is with the cover off

And with the sub board up

Hang on a minute, what's this?

That looks like it could be a chip holder under that chip. I'm no expert on electronics so I don't know

Here is the ECCS and NICS computers side by side

Definitely different, but the question is, is it just an ECCS thing, or an RB20DET-R thing?
Has someone chipped this ECU?

Thinks "have a look on the other side and see if the solder is different".
I have pointed out where the chip is

Looks different to me

Definitely different to the other chips

Looks newer.
Prolly asking the wrong people given the nature of this site :roll:

but can anyone tell me if I'm right or not?

Hooks

kev · **Posted:** Thu Apr 01, 2010 11:54 pm

So...what you're saying is...electricity goes thru those little squiggly lines?

Really? They look so small....

stagefumer11 · **Joined:** Mon Jun 09, 2008 11:07 pm **Posts:** 153

Definitely looks like its been chipped/reprogrammed

31GUN · **Posted:** Sun Apr 04, 2010 2:22 pm

While I deal with the ignition problem, here is something else to look at.
When I bought this car it came with sundry boxes of crap that have been a bit of trash and treasure.
Some of it is garbage some is gold.
The trick is knowing the difference.
Enjoy

Hooks

GTCookie · **Posted:** Mon Apr 05, 2010 11:18 pm

those Dunlop Volley's are certainly GOLD.

31GUN · **Posted:** Tue Apr 06, 2010 12:44 am

If I was of a different persuasion, I'd say the legs are damn sexy too.
But I'm not.
Not that there's anything wrong with that

Hooks

31GUN · **Posted:** Sat Apr 10, 2010 1:59 am

I think I have found the problem.
The board in the ecu looks like it has seen a bit of heat. Bit hard to see in this pic

Here it is a bit closer

And this is the culprit on the other side

This is it with the retainer plate removed

Question is can it be fixed?
Probably not but things aren't entirely here

........Yet

Hooks

arsonist63086 · **Posted:** Sat Apr 10, 2010 2:06 pm

lmao like the pointing finger :tu:

31GUN · **Posted:** Sat Apr 10, 2010 4:27 pm

Google images + printer = pointer fun :tu:

Hooks

ben · **Posted:** Sat Apr 10, 2010 8:41 pm

Damn, I would have never seen that. Are you good a finding Waldo too?

The pointing finger is very Monty Python-esque.

31GUN · **Posted:** Sat Apr 10, 2010 11:16 pm

Well spotted Ben.
I'm a big Terry Gilliam fan.

Hooks

ben · **Posted:** Sun Apr 11, 2010 5:36 pm

31GUN wrote:

Well spotted Ben.
I'm a big Terry Gilliam fan.

Hooks

Gilliam is brilliant! 12 Monkeys is one of my fave films ever.

31GUN · **Posted:** Fri Apr 16, 2010 6:22 pm

Okee dokee, had a bit of success.
Here is an ecu pic.
The one on the left(and plugged in) is the one Seventh Skyline sent me from Tasmania. (many thanks)
The one on the right is Mr Bad Boy

I actually plugged it in and fired her up on Tuesday night and it burst into life on 5 or 6 cylinders. This morning (Saturday) I pulled out the plugs for a look see.
No easy job, they are to be found way down here

under the coil packs. To get to them first you have to remove the strut brace, crossover inlet tube, igniter, valley cover, ignition loom, and coil packs.
At least an hours work.

And here they are, left to right
1 & 2

3 & 4

5 & 6

1 wet and 1 black in all cases.
6 new plugs later, and here is a pic of Fade somewhere other than my garage

The ecu that is in the car is for a standard RB20DET
So I will either see about getting the RB20DET-R ecu fixed or getting the standard one chipped to run the (much) bigger turbo.
At the very least I would like to put it on the dyno and check that the fuels are safe. Also want to get rid of the 15psi boost cut :twisted:

I'll be talking to a tuning mob that can do these Eproms later this week.

Hooks

31GUN · **Posted:** Fri Apr 23, 2010 12:58 am

I'll let the pics do the talking

It did it again, same thing, same freeway! different ecu.
I'll pull out the ecu tomorrow and see if it has fried the same bit.
The plot thickens...

In other news, I took the GTS-R ecu to an tuning mob today and learnt a few things.
1, the fried gizmo is indeed an ignition module.
2, they did not do the rechip in the ecu, it's Japanese.
3, that chip is the one that controls the boost cut.
4, they want $1200 AuD for a chip and tune :shock:

Hooks

Go Baby Go · **Posted:** Fri Apr 23, 2010 6:37 am

Hooks... did you let Kev near it again.............................
:wink:

31GUN · **Posted:** Fri Apr 23, 2010 8:27 pm

Not unless he snuck around when I wasn't here....
Kevin....?
Back to the problem at hand.
It has done exactly the same thing, fried the ignition module.

The ecu has another ignition module on the other side

They both hook up to the top 3 pins on this socket

So the plan is to follow the wire from the plug back and see if I can find a short or whatever else is causing this.
I haven't given up yet, but I'm close to taking it to someone who understands how electicity works.
I will also have to regard that as a personal failure. I can figure out most things but have some sort of mental block when it comes to electrons.

Hooks

arsonist63086 · **Posted:** Fri Apr 23, 2010 10:15 pm

i got a suggestion.. i was thinking why not just get a ecu from another car lets say a car withe the similar setup (like coil packs) like a a 300zxt and open up the ecu and remove the transistor you need from the other less expensive ecu (300zx and weld it to the skyline ecu.. just an idea might work since they both look similar and the internals look the same also its not like your changing out the ROM chip from the ecu... (just a thought)

31GUN · **Posted:** Fri Apr 23, 2010 11:11 pm

I thought about that, I have an ecu from a NICS RB20 det with the same modules in it.
At first I thought that the module was the problem.
Now that it has done the same thing to 2 different ecu's, I figure it's something in the wiring that is frying the modules.

Hooks

arsonist63086 · **Posted:** Sat Apr 24, 2010 5:46 pm

oh ok... well if the wiring ends up being ok then it might be a coil pack or what ever the module triggers... if you have the diagram of the wiring we might be able to help you out with your problem..

31GUN · **Posted:** Sun Apr 25, 2010 8:32 pm

I don't have a wiring diagram but Lysdexia on the R31club sent me this which is real handy
http://wiki.r31skylineclub.com/images/c ... 0and30.gif

Pinouts for the ecu :tu:

Hooks

Project fade to black- 1987 HR31 Skyline

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