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Old 11-27-2021, 07:53 PM   #1
Balkins
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Default Computer Issue--- Red Light not appearing ???

Hey Buds,

My 94, 4cly D21, AUTO is having idle issues and we pulled the seat to check the computer for codes.

Following the Manual instructions for testing idles issues, the computer failed to Flash 'Any Red Lights' as we cycled through the tests.
  • Not sure what could be the issue...???
  • Anyone ever have this problem??
Thanks for your input...






.
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Old 11-28-2021, 02:43 AM   #2
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Sounds like you need another ECU
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Old 11-28-2021, 01:53 PM   #3
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Originally Posted by jp2code View Post
Sounds like you need another ECU

Hi Jp

I was afraid of that. ---->Is it possible to be a Grounding Wire Issue?




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Old 11-28-2021, 07:01 PM   #4
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I wouldn't rule out the computer just yet. Check the powers and grounds for it first. You'll need a copy of the FSM for the wiring diagrams.
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Old 11-28-2021, 07:40 PM   #5
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In the 94 Service Manual EC section, the Trouble Diagnoses section on EC-171 shows that the Main Power Supply and Ground Circuit for the KA24E is part of Diagnostic Procedure 22, which is on EC-222.

On EC-179, it shows that the ECM (ECCS Control Module) throws code 31 when it malfunctions.

Writing notes down as I am going through the manual, which is what you should have already done.

On EC-180, it says if you are in Diagnostic Test Mode 2 (Mixture ratio feedback), the Green LED will be ON and the Red LED will be OFF if the engine is stopped while the ignition switch is turned ON. Also, if engine is running and Green LED Blinks and Red LED is OFF, you are more than 5% rich on your fuel mixture ratio. Do any of these match your case? Adjusting the mixture ratio is on EC-166.

The ECM function check is on EC-275.

EC-193 mentions having the pins all connected with no bends or breaks on the terminals.

Page EC-222 starts the Main Power Supply and Ground Circuit procedure. It shows the wiring layout and where your ECCS relay is located (make sure it is good). The following 2 pages go through what to check to make sure you have power, harness continuity, voltage, and ground (ECM terminals 39, 48 and engine ground).

Here is the EC section:

https://www.nicoclub.com/service-man...F1994%2FEC.pdf

Once the page loads up in your browser, you can use the Adobe control to save a copy to your PC.
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Old 11-28-2021, 10:00 PM   #6
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Quote:
Originally Posted by jp2code View Post
In the 94 Service Manual EC section, the Trouble Diagnoses section on EC-171 shows that the Main Power Supply and Ground Circuit for the KA24E is part of Diagnostic Procedure 22, which is on EC-222.

On EC-179, it shows that the ECM (ECCS Control Module) throws code 31 when it malfunctions.......

Thanks Man...

Yes...we did that testing...but not the ECM test.
What a pain in the Arse !

I'm seriously considering selling this year truck and looking for a OBDII system. I feel sorry for the mechanics and end-users of the OBDI system... its like i'm reading / looking for smoke signals with the flashes, etc.----not to mention the location of it. My Ass and knees are scabbed !


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Old 11-28-2021, 10:27 PM   #7
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Quote:
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not to mention the location of it. My Ass and knees are scabbed !


LOL Remember that the humans that designed these were much smaller than your "average American" human. They could/can fit into much smaller spaces...



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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 11-29-2021, 10:18 AM   #8
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Quote:
Originally Posted by Balkins View Post
Thanks Man...

Yes...we did that testing...but not the ECM test.
What a pain in the Arse !

I'm seriously considering selling this year truck and looking for a OBDII system. I feel sorry for the mechanics and end-users of the OBDI system... its like i'm reading / looking for smoke signals with the flashes, etc.----not to mention the location of it. My Ass and knees are scabbed !
I would not blame you a bit. I owned a few pre-96 hardbody trucks. Most were single cab trucks. Once I got my hot little hands on a 96-97 model in king cab, a lot of problems just....went away...

Nothing like being able to plug in a code reader into that port down by your fuse box, and being able to stuff mass things behind your seat. Another bonus is that on the driver's side, you can put the seat back SO far...you can realistically sleep in it.

If you can get one in four wheel drive...so much the better. But on the other side of that coin, 4WD in these things is a bit overrated. You would NOT believe where I could take my 97 four banger in two wheel drive. You just need a little more weight in the bed. Like your camping gear for example. Also, two wheel drive there is a lot less to worry about, and to fix. How I got around all that was to install 15 inch wheels instead of the stock 14's and put really good tires on it. There wasn't a Forest Service road I couldn't conquer easily, two wheel drive or not. It went anywhere I pointed the steering wheel.

I have said here a couple of times that I sold my 97 in favor of an Xterra I got on the cheap that was reasonable miles and in nice shape. (Seller was desperate for money, could not pay his rent) Sold the truck below for just over five thousand and got the Xterra for a paltry three. I love that Xterra. And I made two grand profit on the whole deal.

But I still miss my truck. Yes, I do. Maybe ditch that 94 and start searching for a 96-97 king cab.

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Old 11-28-2021, 11:44 PM   #9
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Yeah, but you can look at your friends and say, "I don't need no OBD2 code reader! I know how to read smoke signals coming out of my ECM."

I guess that's some comfort. lol
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Old 11-29-2021, 02:24 AM   #10
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Don't let the magic smoke out of the ECU. If you do that it'll never work again.

The truck runs, right? Don't rule out the possibility that you might just have a dead LED in the ECU. If you can put the ECU in the appropriate diagnostic mode the check engine light should still flash out the codes. The difference is you would just have one flashing LED instead of two as it cycles through the various diagnostic modes.

Whatever you do, don't mess with the idle adjustment screw or any of the other screws on the throttle body. That'll just create a problem where there wasn't one before (ask me how I know). If you find you're having to read error codes frequently you can make a blinky light box thingy to interface with the ancient data link connector under the dash. It's pretty simple to make one, all you need is a momentary pushbutton switch and two 12V LEDs.
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