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citrus3000psi
PostPosted: Tue Jun 09, 2009 3:05 pm  Reply with quote
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Joined: 09 Dec 2008
Posts: 71
Location: Indianapolis, Indiana

On the ecu what does it output, +12, -12? Reason I ask, I tested my ecu the other day, and couldn't get any volts out of it. My diag wire works, i can read codes off of it, so I know the ecu is booting and working.

But still can't get anyhing out of the CEL, any ideas?

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98 Acura Integra Type R #139
92 Mitsu Eclipse GS Turbo (in pieces)
88 Dodge Ram 50 (almost running)
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jeffball610
PostPosted: Tue Jun 09, 2009 3:27 pm  Reply with quote
Too Much Time on His Hands


Joined: 22 Feb 2006
Posts: 619
Location: Las Vegas, NV

Get a data logger. This is a cheap and essential investment in your 4G63 powered vehicle. The output is 12v from what I can tell. You can use an electronic buzzer tool to help diagnose the CEL codes.

http://www.vfaq.com/index-main.html

Under "Electrical" and "Retrieving Diagnostic Error Codes" there is a write up of how to perform this simple task. Bookmark VFAQ.com as it is essential to your DSM and 4G63 modifications.

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1972 Datsun 510
7-bolt 4G63T, EVO 9 pistons and rods, Garrett GT3076R, "flipped" stock intake, Toyota R154, Z31 R200 w/ CVs
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citrus3000psi
PostPosted: Wed Jun 10, 2009 8:27 am  Reply with quote
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Joined: 09 Dec 2008
Posts: 71
Location: Indianapolis, Indiana

I have a palm emulator on an old laptop that I can use, I forget the software that it runs.

However I did what you just said already, I hooked up a light and read the ecu diag codes sucessfully. I just wondered why I couldn't get the CEL light to turn on, even on initial power and ignition.

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98 Acura Integra Type R #139
92 Mitsu Eclipse GS Turbo (in pieces)
88 Dodge Ram 50 (almost running)
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jeffball610
PostPosted: Wed Jun 10, 2009 7:15 pm  Reply with quote
Too Much Time on His Hands


Joined: 22 Feb 2006
Posts: 619
Location: Las Vegas, NV

MMCD is the software.

http://mmcdlogger.sourceforge.net/

There may be an issue with the wiring that may cause the CEL not to come on. I once had a bad ground in the instrument cluster of my 97 Eclipse and half the lights came on for no reason. Check your connections there. You might also trace the specific pin on the instrument cluster where it plugs into the dash and see if you can get something from the wiring itself. If you get a signal from the wiring, then it's the cluster. If you don't get a signal from the pinout in the wiring, trace it back to the ECU and see where it's bad.

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Do it in a Datsun!
1972 Datsun 510
7-bolt 4G63T, EVO 9 pistons and rods, Garrett GT3076R, "flipped" stock intake, Toyota R154, Z31 R200 w/ CVs
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Claine
PostPosted: Tue Sep 04, 2012 4:51 am  Reply with quote
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Joined: 04 Sep 2012
Posts: 5

citrus3000psi wrote:
On the ecu what does it output, +12, -12? Reason I ask, I tested my ecu the other day, and couldn't get any volts out of it. My diag wire works, i can read codes off of it, so I know the ecu is booting and working.

But still can't get anyhing out of the CEL, led lights any ideas
?


No great idea. You need to take assistance of some expert.
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