Gription
02-13-2011, 10:06 PM
So I made a thread about this issue before but I guess no one quite understood what I was talking about, so I've broken it down to make is easier to see what I already know and don't know, what I've tested, and what is working and what isn't. I searched around and the closest I came to an answer was here (http://zilvia.net/f/engine-tech/251932-please-help-me-make-s14-sr-start-please.html), but it came to a dead end.
Anyway, I just finished making my own ignition and chassis harness and now I am getting no spark whatsoever. Below is a list of my setup, an exact diagram of the ignition harness I'm running, and a list of things I have tested.
-First and foremost the car does not matter whatsoever because there is not a single oem wire remaining. Everything has been thrown out and replaced with my own ignition and body harness.
-Motor is s14sr20 with WC ecu.
-I'm canceling out the engine harness as an issue because I used it on my last setup just as it is now and it has always worked fine.
Here is everything I've tested:
Spark Plugs- OK
Ignitor Chip- OK
Coil Packs- OK
Fuel pump & injectors- OK
Cam angle sensor:
-180* singnal- OK
-1* signal- No voltage reading
-All cam angle sensor wires have tested good continuity through the harness to the ecu.
I've gone through ecu pinouts and wiring diagrams and I can see that there are 2 main +12v wires coming from the eccs relay that give power to the ecu, which I will elaborate on a little further down. On my setup, one of these wires is carrying voltage and the other is not.
Here is a diagram of my harness which controls fuel, ignition, and power to the car and ecu.
http://i14.photobucket.com/albums/a311/strikebackbmx/Onevia/s14srcustomharness.jpg
Next is a pinout diagram of my ecu to give you some more input on what I've got, which can be viewed here- http://www.kouki.co.uk/reference/nissan-200sx-s14-sr20det-ecu-pinouts
The part of interest to me is at the eccs relay which is supposed to carry power through 2 main wires to the ecu. Here is a closeup of that diagram.
http://i14.photobucket.com/albums/a311/strikebackbmx/Onevia/eccsrelay.jpg
-The coiled wire coming from the relay (pin 85) is carrying +12v to pin #16 on the ecu.
-The switched wire coming from the relay (pin 87) has no voltage reading to pins #49, #59, or the B/W wire leading to the engine harness.
To test this out as being a problem, I bypassed the relay and got +12v to ecu pins #49, #59, and the B/W wire leading to the engine harness and I still had:
-No spark
-No voltage reading on the 1* cam angle sensor lead.
So I'm in a bind and I have no idea what is causing my no spark issue. Today I got curious so I tested all 4 wires on the CAS using these instructions from the fsm:
http://i44.photobucket.com/albums/f20/iam2pro4u/cascheck.jpg
-I still got a .01-5v reading on the 180* signal lead
-Still no voltage on the 1* signal lead (labeled #2 in the instruction diagram)
-12v on pin #3, which carries power to the cas
-.01-1v reading on the #4 pin, which should be ground(?)
Should the ground lead on the CAS be fluctuating when the rotor turns? I found this a little odd and thought maybe I somehow crossed up the ground and 1* signal wires?? I dunno.
I've traced damn near every wire in the car and I have no new ideas of what could be causing this. Any wiring gurus out there who may have an idea or an answer, I really need your help! Thanks :D
Anyway, I just finished making my own ignition and chassis harness and now I am getting no spark whatsoever. Below is a list of my setup, an exact diagram of the ignition harness I'm running, and a list of things I have tested.
-First and foremost the car does not matter whatsoever because there is not a single oem wire remaining. Everything has been thrown out and replaced with my own ignition and body harness.
-Motor is s14sr20 with WC ecu.
-I'm canceling out the engine harness as an issue because I used it on my last setup just as it is now and it has always worked fine.
Here is everything I've tested:
Spark Plugs- OK
Ignitor Chip- OK
Coil Packs- OK
Fuel pump & injectors- OK
Cam angle sensor:
-180* singnal- OK
-1* signal- No voltage reading
-All cam angle sensor wires have tested good continuity through the harness to the ecu.
I've gone through ecu pinouts and wiring diagrams and I can see that there are 2 main +12v wires coming from the eccs relay that give power to the ecu, which I will elaborate on a little further down. On my setup, one of these wires is carrying voltage and the other is not.
Here is a diagram of my harness which controls fuel, ignition, and power to the car and ecu.
http://i14.photobucket.com/albums/a311/strikebackbmx/Onevia/s14srcustomharness.jpg
Next is a pinout diagram of my ecu to give you some more input on what I've got, which can be viewed here- http://www.kouki.co.uk/reference/nissan-200sx-s14-sr20det-ecu-pinouts
The part of interest to me is at the eccs relay which is supposed to carry power through 2 main wires to the ecu. Here is a closeup of that diagram.
http://i14.photobucket.com/albums/a311/strikebackbmx/Onevia/eccsrelay.jpg
-The coiled wire coming from the relay (pin 85) is carrying +12v to pin #16 on the ecu.
-The switched wire coming from the relay (pin 87) has no voltage reading to pins #49, #59, or the B/W wire leading to the engine harness.
To test this out as being a problem, I bypassed the relay and got +12v to ecu pins #49, #59, and the B/W wire leading to the engine harness and I still had:
-No spark
-No voltage reading on the 1* cam angle sensor lead.
So I'm in a bind and I have no idea what is causing my no spark issue. Today I got curious so I tested all 4 wires on the CAS using these instructions from the fsm:
http://i44.photobucket.com/albums/f20/iam2pro4u/cascheck.jpg
-I still got a .01-5v reading on the 180* signal lead
-Still no voltage on the 1* signal lead (labeled #2 in the instruction diagram)
-12v on pin #3, which carries power to the cas
-.01-1v reading on the #4 pin, which should be ground(?)
Should the ground lead on the CAS be fluctuating when the rotor turns? I found this a little odd and thought maybe I somehow crossed up the ground and 1* signal wires?? I dunno.
I've traced damn near every wire in the car and I have no new ideas of what could be causing this. Any wiring gurus out there who may have an idea or an answer, I really need your help! Thanks :D