ECU: How to Read and Diagnose Z31 Codes: 84-86 ONLY - Nissan Forum
Z31 300ZX(T) 1984-1989 Zs - Engine and Chassis Discussion

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post #1 of 20 Old Jan 30th, 2005, 07:21 PM Thread Starter
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ECU: How to Read and Diagnose Z31 Codes: 84-86 ONLY

Since the last thread we had about this was a little iffy. Here's what the FSM says... If anyone needs a reference page posted please ask through PMs. All pictures are under 70KB a piece for you 56K users. I compressed them quite a bit.

Procedure to pull codes is as follows.







1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI,
Under Construction
Clutch, Wheels, Tint, Paint, Interior, HID

Last edited by ♣AsleepZ♣; Jan 30th, 2005 at 08:12 PM.
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post #2 of 20 Old Jan 30th, 2005, 07:38 PM
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Owned by the :redx:

1992 Yamaha FZR 1000. 145 Hp, all stock..
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post #3 of 20 Old Jan 30th, 2005, 08:06 PM Thread Starter
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Sorry man but I see them all... the first 4 are attachements straight off the board. The last one is photobucket and they all work..


If anybody else is having problems please post.

1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI,
Under Construction
Clutch, Wheels, Tint, Paint, Interior, HID

Last edited by ♣AsleepZ♣; Jan 30th, 2005 at 08:09 PM.
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post #4 of 20 Old Jan 30th, 2005, 08:15 PM
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Fixed. Can everyone see them?

1992 Yamaha FZR 1000. 145 Hp, all stock..
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post #5 of 20 Old Jan 30th, 2005, 10:41 PM
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This seems to be the early ecu code reading procedure (THE TITLE SAYS 84-89). It is not the one used on 87 or later ecus. There are differences in codes also.
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post #6 of 20 Old Jan 30th, 2005, 10:43 PM Thread Starter
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Well that's what the FACTORY SERVICE MANUAL says. So I think it's probably correct.

1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI,
Under Construction
Clutch, Wheels, Tint, Paint, Interior, HID
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post #7 of 20 Old Jan 30th, 2005, 11:21 PM
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Well I have worked on 1987 Maximas, 1988 300zx, 1987 200sxse and I assure you that it is not the correct procedure.

I have also worked on 1984/1985/1986 300zx.

Dropping codes on 87 and later vg30e Nissans is only done in mode 3. Unless the procedure tells the person HOW to even get to mode 3, then it is not correct.

The procedure you list is from a two mode only type ecu.
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post #8 of 20 Old Jan 31st, 2005, 12:12 AM Thread Starter
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Well I've pulled the codes from mine this way and it worked perfectly...

1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI,
Under Construction
Clutch, Wheels, Tint, Paint, Interior, HID
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post #9 of 20 Old Jan 31st, 2005, 10:01 AM
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That procedure is from a 1986 Field Service Manual.

Its possible that your ecu is from a 1984-1986 car. Just drop it and if there are codes listed on the ecu box itself, then it is a 1984-1986.

If it does not have codes listed on the outside, its a 1987-1989 ecu. I take it you are not the origional owner.

Its very doubtful that Nissan would move Maximas, 200sxse and non-turbo 300zx to a new generation ecu and leave the 300zxt with an older technology.
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post #10 of 20 Old Jan 31st, 2005, 10:49 AM
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a18 680 m90 IS A 1987 300ZX TURBO part number for a 5 speed federal (non-Cali) Nissan ecu.
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post #11 of 20 Old Jan 31st, 2005, 12:20 PM
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Possible maybe somehow he was putting it in Mode 3 accidently. From what I saw of the mode change procedure in my 88 FSM, it's possible, but you'd have to get real lucky......

I'll change the title to reflect the earlier procedure.

I can also either make a seperate thread for the 87-89 procedure , or refer people to the FSM link, the section explaining all 5 modes and code retreival and testing procedures for the parts involved is incredibly long. Thanks for bringing this to our attention, BTW.

1992 Yamaha FZR 1000. 145 Hp, all stock..
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post #12 of 20 Old Jan 31st, 2005, 03:57 PM Thread Starter
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Hmm that's something I would have to check out. No I'm not the first owner but the first owner wouldn't know how to change out an ECU. Maybe I was just lucky and it gave out the codes either way. I'll have to give it some more investigation.

1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI,
Under Construction
Clutch, Wheels, Tint, Paint, Interior, HID
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post #13 of 20 Old Oct 16th, 2010, 04:40 PM
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hey my ecu doesnt light up the leds.... does that mean i need a new one? i am getting battery voltage
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post #14 of 20 Old Feb 4th, 2011, 07:03 AM
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Sorri,maybe it's a dumb question but where can i find this part,where I can do self-diagnostic? Under the hood?near the engine?

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post #15 of 20 Old Feb 4th, 2011, 11:16 AM
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For most countries, the ECU is in the passenger side kick panel.

Disclaimer:
One thing you'll find about me is that I can be very helpful to people who take their time to ask complete questions with good grammar and punctuation. I'm also a real ass to people who don't show at least a little effort in their posts.
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