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Old 07-28-2016, 04:13 PM   #21
WorseFuture
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So I pulled the codes.Crazy thing is I have the same codes as in the video. 21,24,31. Now if 31 is ecu signal beyond normal range..or load signal.How do I go about fixing those.And 21 is ignition signal, is that the coil pack on driver side fender behind the headlight?Is it testable without a multimeter?24 is throttle body switch..where is that?Thanx in advance guys..I really appreciate the help.
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Old 07-28-2016, 05:40 PM   #22
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We need Deerhurst in here. His truck has those older pre-ODB codes like yours.
  • 21 = Ignition Signal Same as Code 21 in ODB.
  • 23 = Neutral & Clutch/Inhibitor Switch Those fail often. You could just bypass around it or go buy a replacement
  • 31 = Load Switch / ECU (ECCS Control Unit) Same as Code 31 in ODB

For the ones that are the same as ODB, go to the Free Service Manuals in my signature below, download the d21_truck_1989.pdf, and go to the EF & EC section.

The truck is basically the same as the 1989 version; changes were largely to the code mapping to make it 100% ODB.
  • Ignition Signal is covered on EF & EC-100 (make sure you don't have blown fusible links, shown in the diagram)
  • Neutral/Clutch/Inhibitor Switch: EF & EC-128 (make sure you don't have blown fusible links, shown in the diagram)
  • Engine Control Unit (ECU): EF & EC-102
  • Load Signal: EF & EC-130 (make sure you don't have blown fusible links, shown in the diagram)
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Old 07-28-2016, 06:46 PM   #23
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Thanx for the help..I'll junk it.all tjat makes no sense to me.thanx for the help ..I do appreciate it
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Old 07-28-2016, 08:34 PM   #24
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Quote:
Originally Posted by WorseFuture View Post
Thanx for the help..I'll junk it. all that makes no sense to me. thanx for the help ..I do appreciate it
It's not as hard as it seems.

The manual is setup really nice, and it is a free download that Nissan gives out.

That said, this is why these early electronics vehicles are not for everyone.
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Old 07-28-2016, 10:00 PM   #25
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That diagram doesn't help me .I don't know what I'm looking at or for.what color are the wires.why can't it just say find coil test this wire blah blah...etc.whats with all the lines everywhere.is the fusible link exposed..hidden..what's it look like.as I said..no help..I have the book..I'll see if it can be more clear.
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Old 07-28-2016, 10:16 PM   #26
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Here's a sticky on the Fusible Links:

Fusible links

It is 2 or 3 wires designed to burn up if your alternator/voltage regulator sends huge surges through your system.

Also, these are copies of the old, original manuals. They were not printed in color, so the PDFs have no color in them either.

If I wire has BR on it, you can assume BRown. G for Green. B/R for Black with Red stripe. GY for Green and Yellow.

Usually, it is complete gibberish until you are looking at the wiring harness. Then, it's like, "Oh, so B/P must mean Black and Pink."

There's a section on how to read their gibberish in the General Information section, starting on GI-7, if that helps.

Note: After looking at that page, the "slash" / symbol means the wire color is striped with the base color given first. So, L/W = Blue with White Stripe.

What do you know? L is Blue! Never would have guessed that. I thought L was for Lime.
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Old 07-31-2016, 05:42 PM   #27
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Hello again guys.I think I'm on the right path now.I tested pin 1 on the coil plug(blue)..no voltage.I then tracked it back to a plug.This plug is like a dead end.what I mean is a piece unplugs..but it think it's like a fuse of sorts..Anyhow it passes through the other wire is a white with red dots..I tested both and no current.So..I tracked that..it goes up,over to my driver fender..then inside up to my cabin.Where does that wire end up? Also I can't find my tach resistor.That was barely moving when this happened so I wanna check that too.And my big thing,how do I check my ignition.I think that's what that white wire is ultimately connected to.
You have been a great help so far.
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Old 08-02-2016, 02:42 AM   #28
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I'm at the end of my knowledge on this WF.

If the fusible links are OK, I'd recommend creating a new thread that details what codes you are getting and what you've tried.

I don't think most people follow posts in a HOW TO sticky.
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Old 08-02-2016, 02:52 AM   #29
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Well the issue is at the ecu.pin 3 should have 12 volts when key is on. Mine has 3 volts..time to check grounds
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Old 08-23-2016, 04:21 AM   #30
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Question Check engine light turns on when i hit the gas pedal

i even made a youtube video to show you guys what i mean.
Copy & Paste this bottom youtube video since i don't know how to post youtube videos here I'm new sorry.

https://www.youtube.com/watch?v=gwtHm0XVw_8
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