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Wiring diagram... 78 280Z


wal280z

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  • 1 year later...

  • 3 years later...
Scanned image of the '78 280Z wiring diagram (the one that folds out in the back of the FSM).

400dpi resolution, *.tif format (inside the zip file).

Please remember that the '78 is different from the other year S30 models.

Wayne

have a 78 fuel injection that I'm trying to put back on 77 280z. Having a hard time as the harness was cut off and doesn't seem to match the wires from the 78. Appreciate the diagram, but color might be easier to read. Or anyway to build the 2 part connectors (not an electrician) just need some guidance. Not sure I'm making any sense...

Let me know if you have any input. Have the Fuel injection manual (80 pages worth) and a 77 full color diagram, just want to know if there was anything different with the 78 as it seems to be?

cheers

Mark

[email protected]

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There are some differences. 78's don't have fuel pump contacts in the air flow meter, 78's have an internally regulated alternator. Some pins used on the ECU connector on a 77 are not used on a 78. In short, you would need to use the correct year diagram.

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so should I use the 77 diagram or the 78? The fuel injection is off the 78 and the blocks of wires that should connect to the fuel injection relay near the foot pedal were cut so have to match it up to the 77? Seems hard to find a genuine 78 manual. Have found many previous years (Have a complete 77 color diagrame) and the fuel injection manual.

Appreciate your input. Probably have helped with what you have said already.

thanks much

Mark

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If I recall correctly, the 78 has the FI relays at the relay center (aka beer can holder) underneath the hood whereas the 77 (as you know) has the FI relay near the steering wheel inside the cabin.

Not sure what other differences apply - but the 78 is not a 'plug and play' to anything earlier.

Use both diagrams to identify connectors and their specific uses, and you will need to splice as you go. Obviously, it would be better to get the correct harness, but it sounds like your passenger cabin harness is already hacked to mate with the 78 FI harness...

I think I have a 77 FI harness that has been hacked if you want it for postage - PM me if you want it and I will confirm it's whereabouts...

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Most of the car is a 77, but the fuel injection and exhaust manifold is 78. They had cut the control unit on the 77 because someone had put carbs on it. I was trying to use my 78 Fuel injection and so it seems there will be some splicing involved. I think about it too much and I go cross eyed. Thanks for all the continued input. It does help

Mark

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  • 4 weeks later...
  • 7 months later...

Do you have a list of what all the pin numbers to the ecu mean- as in what the heck they go to?

I am in the process of wiring a gm icm in place of the transistor ignition unit- to hook up to the distributor to convert the analog signal to a digital signal to send to a gm ecu in place of the factory nissan/datsun ecu.

This is so I can tune the eprom chip and the highly tunable 7730 gm ecu.

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do you have a list of what all the pin numbers to the ecu mean- as in what the heck they go to?

I am in the process of wiring a gm icm in place of the transistor ignition unit- to hook up to the distributor to convert the analog signal to a digital signal to send to a gm ecu in place of the factory nissan/datsun ecu.

This is so i can tune the eprom chip and the highly tunable 7730 gm ecu.

dnftt!!
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look all I wanted was to know is if anyone (particularly the main poster) had what all the 35 pins actually were/what they went to on the ecu. That's it - its topic related.

Also I ordered one of those full color wiring diagrams off that site that was under that link.

So I am still missing what you are referencing. Posts like that just cause flame wars and the like and gets you kicked off of forums. You are being completely inappropriate. If you would not mind I would appreciate it if we could go back to the topic.

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No flame war unless you start it. You've talked about putting snow tires on a Z, putting a 455 in a Z, and now putting a GM ecu in a vehicle that it wasn't designed for. This could likely be done with the appropriate research skills and expense but I doubt if you'll find anyone who had done such a swap here. Plus you didn't say the year of the Z you are working on. Pin arrangements differ from year to year, 75-83. Your prior posts were about a 70(?). And it's been almost 6 years since you last posted until yesterday. You can see how one would come to the conclusion I did. Would you like me to reference your previous posts?

Edited by sblake01
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I read a lot so i don't post a lot. 6shooter has done this already but I cannot seem to get a hold of him. I don't have the 70' anymore that's gone i bought a 240sx a while ago rewired the entire car for a dohc swap that is now sold.

Now i have a 78 280z - 83k bought it last year with 79996 original miles. I had to replace the alternator, a wire for a relay, and i have a cai on it now. Also i fixed the iacv also it was missing the hose to the intake. Now the thing runs better than my 2000 civic si which is my daily driver, it has a b16a sirII motor swapped with the stock short gear hydro trans.

The plans have gone all over the place for this z since i bought it last year. I was going to put in a v8 then maybe a ka24de, now after LOTS and LOTS of reading discussing and research; I have found that the disi i have send the same signal as the gm hei (it has 6 teeth and a magnetic pickup in it) all i have to do is tap into the pickup coil and hook them to the two inputs on the gm icm for the pickup coil/sensor (all the icm does is translate a analog signal to a digital signal) then wire the gm ecu to the gm icm as well as match the pins to what they go to for the gm ecu to the datsun harness. Its actually more simple than it sounds. I just need a good correct wiring diagram for my z which from that link that posted I have purchased and should be here in about 5 days. If that does not have a pin out correlation chart akin to what michelle or alldata has it will be very helpful to know what all the pinouts are on the factory datsun/nissan ecu are that way all I have to do is wire it up to the gm ecu.

If i remember correct I may need some sensors that the 280z does not come with factory, also there also are a few sensors the gm ecu does not read based on the signal. All I have to do is swap those out for gm sensors.

The sensors and ecu DO NOT care what engine they are on they are designed to send a signal based on whatever they are trying to read. Map manifold absolute pressure, the o2 sensor reads a temp and the ecu translates it, the intake temp sensor sends a similar signal to the ecu and so on.

Does this make sense to you?

also a LOT happens in 6 years man.

Edited by vega
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Note - Vega, do not read any flames into this post.

First, your post really should have been put on a new topic. While I can see how your post could loosely follow how the thread changed, it's moved far away from the origin post and therefore less likely to get a good response.

Second, you will probably find more information and help over at hybridz when you want to do things like incorporate a GM ECU. This is more of a traditionalist site. Just make sure you search before posting there. They don't tolerate repetition very well.

Good luck with your experimentation.

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Does this make sense to you?
It all makes sense to me. I don't need a lesson in automotive theory. I've been around cars a while and even have a few automotive certifications. That wasn't my point. Evidentally the logic of my previous posts don't make sense to you. Be that as it may, why use an OBDI compliant ECU like the 7730? Yes, it's better than the ananlog JECS setup but why not go to something OBDII compliant? Either way, you'll have to add components to facilitate the use of either system and though the 7730 would be less costly and easier to set up, the OBDII system would be far more tuneable. I have three different tunes, besides the stock one, that I use on my GTO. And it takes less that 5 minutes to change from one to another. Can't do that with a 7730, at least, not that quickly or easily. One other thing. If you're ultimately going to use the 7730, wouldn't it be more important to know it's pinouts rather than the JECS pinouts since you'd be removing that system anyway? This is really more rhetorical than anything else and I don't really need the answers since I don't ever plan to do such a conversion. And if I was, I would do my own research and development/fabrication etc. Just stuff to think about. I'm done with this one. Like Steve said, good luck with your experimentation. Edited by sblake01
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