Go Back   Infamous Nissan - Hardbody / Frontier Forums > Model Specific > Hardbody Forum (D21)

Reply
 
Thread Tools Display Modes
Old 11-27-2021, 07:53 PM   #1
Balkins
1994 nissan d21, XE, 2wd
 
Join Date: Apr 2016
Location: florida
Posts: 70
Vehicle: 1994 nissan d21, XE, 2wd, automatic
Thanks: 89
Thanked 8 Times in 8 Posts
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...






.
Balkins is offline   Reply With Quote
Old 11-28-2021, 02:43 AM   #2
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 52
Posts: 11,173
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,835
Thanked 1,803 Times in 1,573 Posts
Default

Sounds like you need another ECU
__________________
Joe (not a mechanic!) Don't have an account? EMAIL ME
Factory Service Manuals: https://www.nicoclub.com/FSM/Hardbody/
Walk-through: Checking Nissan Trouble Codes
1994 VG30E to VG33E with H256 Cams

jp2code is offline   Reply With Quote
Thanked by:
Balkins (11-28-2021)
Old 11-28-2021, 01:53 PM   #3
Balkins
1994 nissan d21, XE, 2wd
 
Join Date: Apr 2016
Location: florida
Posts: 70
Vehicle: 1994 nissan d21, XE, 2wd, automatic
Thanks: 89
Thanked 8 Times in 8 Posts
Default

Quote:
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?




Balkins is offline   Reply With Quote
Old 11-28-2021, 07:01 PM   #4
SBJ
Total Buzzkill
 
Join Date: Nov 2016
Location: OR
Posts: 3,114
Vehicle: '90 D21 4cyl 5spd 2wd
Thanks: 347
Thanked 595 Times in 529 Posts
Default

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.
SBJ is offline   Reply With Quote
Thanked by:
Balkins (11-28-2021)
Old 11-28-2021, 07:40 PM   #5
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 52
Posts: 11,173
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,835
Thanked 1,803 Times in 1,573 Posts
Default

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.
__________________
Joe (not a mechanic!) Don't have an account? EMAIL ME
Factory Service Manuals: https://www.nicoclub.com/FSM/Hardbody/
Walk-through: Checking Nissan Trouble Codes
1994 VG30E to VG33E with H256 Cams

jp2code is offline   Reply With Quote
Thanked by:
Balkins (11-28-2021), SBJ (11-28-2021)
Old 11-28-2021, 10:00 PM   #6
Balkins
1994 nissan d21, XE, 2wd
 
Join Date: Apr 2016
Location: florida
Posts: 70
Vehicle: 1994 nissan d21, XE, 2wd, automatic
Thanks: 89
Thanked 8 Times in 8 Posts
Default

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 !


Balkins is offline   Reply With Quote
Thanked by:
jp2code (11-28-2021)
Old 11-28-2021, 10:27 PM   #7
89'HBV6
Ol'school Geek
 
89'HBV6's Avatar
 
Join Date: Mar 2020
Location: Washington State / the Left Coast
Posts: 1,508
Vehicle: 89' D21 KC SE V6 5spd 2WD - 87' D21 KC SE V6 5spd 2WD
Thanks: 1,227
Thanked 361 Times in 329 Posts
Default

Quote:
Originally Posted by Balkins View Post
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...



__________________
. . . Factory Service Manuals: https://www.nicoclub.com/nissan-service-manuals
Quote:
Originally Posted by Deerhurst
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.
89'HBV6 is offline   Reply With Quote
Old 11-28-2021, 11:44 PM   #8
jp2code
Software Developer
 
jp2code's Avatar
 
Join Date: Dec 2011
Location: Longview, TX [USA]
Age: 52
Posts: 11,173
Vehicle: 94 LB 2x4 Manual VG33e
Thanks: 1,835
Thanked 1,803 Times in 1,573 Posts
Default

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
__________________
Joe (not a mechanic!) Don't have an account? EMAIL ME
Factory Service Manuals: https://www.nicoclub.com/FSM/Hardbody/
Walk-through: Checking Nissan Trouble Codes
1994 VG30E to VG33E with H256 Cams

jp2code is offline   Reply With Quote
Old 11-29-2021, 02:24 AM   #9
SBJ
Total Buzzkill
 
Join Date: Nov 2016
Location: OR
Posts: 3,114
Vehicle: '90 D21 4cyl 5spd 2wd
Thanks: 347
Thanked 595 Times in 529 Posts
Default

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.
SBJ is offline   Reply With Quote
Thanked by:
89'HBV6 (11-29-2021), jp2code (11-29-2021)
Old 11-29-2021, 02:49 AM   #10
Deerhurst
4/86 SE-V6 2 tone 4x4 HB
 
Deerhurst's Avatar
 
Join Date: Apr 2013
Location: Oregon
Posts: 8,070
Vehicle: 1986.5 SE-V6 4WD D21, 2003 Audi A4 Avant 3.0 Quattro
Thanks: 919
Thanked 1,093 Times in 986 Posts
Default

You just need this if you do:


https://www.sparkfun.com/products/retired/10622




I have talked to folks that have burned out lights on their ECM. Being a 94 you can tap into the check connector and see if that's the case.
__________________
1986.5 SE-V6 4X4 D21 Hardbody
Pacesetter Long Tube Headers
Morimoto Mini D2S HID Projectors and Hella 500s
VG33i
Deerhurst is offline   Reply With Quote
Thanked by:
89'HBV6 (11-29-2021), Balkins (11-29-2021)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 10:35 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.