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Registered
Join Date: Oct 2006
Location: Laguna Vista
Posts: 2,196
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led blink code tester
I have had a couple of folks ask for this so first attempt.
To connect a diagnostic LED on the 951 you have two options for where to connect and also the choice for location of the LED is up to you. You will need a standard 5V 20miliamp LED any color you like. (Radio shack has them). You will also need a 330 Ohm ¼ or 1/8 watt resistor. (Orange Orange Brown bands on it). Connect the resistor to the anode of the LED (this is the longer pin on the LED). You can connect to either side but I like to use the anode.  This is the basic blink code flasher LED that we all talk about and use. Now the connection. You can connect it to the diagnostic port in the car (on the driver side fire wall) See pic 1. You can also connect to the KLR connector C to pin 3 of the KLR connector and A to pin 6 See pic 2. You can connect it into the KLR it self as I have done. See pic 3. Where you mount the LED is up to you in my case I have mounted it on a board that also has O2 and knock sensor output on it. The whole thing lives in my glove compartment. One further point if you hook it up to the diagnostic port in the engine bay you will have to route the wires into the car some how. Watch out for causing water leaks. Sox      
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"Little problems always come back and bring bigger friends with them". 1986 951"MADDOG" black Dual port WG, 4 port control valve with EBC Last edited by soxnail; 09-21-2007 at 08:46 PM.. |
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09-21-2007, 08:38 PM
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Registered
Join Date: Oct 2005
Location: Up High in the Colorado Rockies
Posts: 44
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Thanks Soxnail,
 I will try this today and report back.
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09-22-2007, 07:04 AM
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Registered
Join Date: Oct 2005
Location: Up High in the Colorado Rockies
Posts: 44
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Well this went smoothly. Did it just like Sox said, (except I used an LED with built in resistor, see pic) LED red wire to KLR pin 6 (big 2.5mm BK/YE wire) and LED black wire to KLR pin 3 (.75mm GN wire). Mounted the LED next to my W/B display.
Started the car and pulled the TPS sensor plug, LED blinked 4-1 code  Unfortunately now when the car warms up it dies. The joys of playing around with 20 year old wiring and computers. I’ve isolated the problem to two areas; will probably start a new thread latter to confirm my ideas on this. Thanks again Soxnail for doing this write-up.  
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09-23-2007, 08:27 AM
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Registered
Join Date: Aug 2006
Location: Napa Valley, CA
Posts: 169
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Yet another great idea!
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Keith 1986 Porsche 951 |
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09-23-2007, 09:47 PM
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Super Moderator
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there's some really in-depth discussion, and how to make an easy knock-counter/blink code led that plugs into the inside diagnostic port and is removable here;
http://forums.rennlist.com/rennforums/showthread.php?t=311336&highlight=knock+count
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!) Last edited by nize; 09-24-2007 at 09:39 AM.. |
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09-24-2007, 09:36 AM
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