DD240sx Posted November 27, 2014 Report Posted November 27, 2014 I have currently swarped a ka24de into my 1986 720. The lower wiring is perfectly fine it cranks and everything.I followed the upper ka24de wiring harness diagram from a forum using 3 relays but my relays aren't closing. Could this be a bad ecu but I haven't tried using direct power to all my wires. Has anyone experienced this issue cause isn't the ecu suppose to ground the relays to create contact? 1 Quote
datzenmike Posted November 27, 2014 Report Posted November 27, 2014 http://community.ratsun.net/topic/537-how-to-wire-a-ka-ca-sr-and-vg-into-anything/ 1 Quote
DD240sx Posted November 27, 2014 Author Report Posted November 27, 2014 I followed that diagram and nothing. Relays tested good just not closing Quote
datzenmike Posted November 27, 2014 Report Posted November 27, 2014 Grounds then. Can't have too many. I'm no expert on this I'll say that right now. Just pointing. but I hear about good solid ground returns on EFI and EFI swaps. 1 Quote
mhub91 Posted November 27, 2014 Report Posted November 27, 2014 Have you attached the ground on the driver's side of the engine, rear corner of valve cover area? "mesh" braided looking cable / wire. Screw this to firewall. 1 Quote
mhub91 Posted November 27, 2014 Report Posted November 27, 2014 My first question - Is your ECU turning on? There should be a red, or a red and green LED bulbs in a small window on back of ECU. Are this illuminated when key is turned on? Icehouse has put a HUGE amount of work on creating these very helpful diagrams, however they can be a little confusing to understand. I've taken the time to "redux" his diagram to help others who choose not to use his Can/Am Box. While it's a great invention, not all of use can afford to buy it. This is a very, very simple wiring job. I drew this diagram and then used it when I wired my KA24DE into my '79 510. This is 'literally' all the instruction you need to wire up a dohc KA. NOTE: For whatever reason, maybe my own fault or possibly my ECU (i dropped it - doh!), my fuel pump would not prime, nor would it pump while cranking or running. Therefore, I decided to just put it on it's own switch. This also served as a kill switch so it can't get stolen. If you follow this diagram and your fuel pump doesnt work, just put it on it's own circuit with a switch. Quote
DD240sx Posted December 1, 2014 Author Report Posted December 1, 2014 I don't have any lights turning on so I guess I need a new ecu but any chance it could be my wiring harness? Quote
DD240sx Posted December 1, 2014 Author Report Posted December 1, 2014 Also does it matter what kind of relays you use? Quote
mhub91 Posted December 1, 2014 Report Posted December 1, 2014 Standard bosch relays fork fine, thats what I used. If those lights are not turning on, you are not getting power, or you have a bad ground. Ecu's dont "just go bad". It's highly unlikely the ecu is bad. Check my diagram with you're wiring. Let me know. Quote
filthy forever Posted December 3, 2014 Report Posted December 3, 2014 do ground side voltage drops... if you dropping more than 0.1v then theres excessive resistance... most likely corrosion or a loose connection.. also make sure you running your grounds to an unpainted surface... typically the engine block or chassis is a known good ground. Quote
DD240sx Posted January 5, 2015 Author Report Posted January 5, 2015 Ok so I got the can am box from icehouse and wired it up. Relays are not working so could I have a bad battery or ecu... maybe even ignition switch causing it not to cut on? Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.