no start problem, only sparks 1/3 CAS rotations
03-14-12, 11:07 AM
#29
Rotary Freak
Four firings of one turn of the CAS is normal. Yours isn't.
Pull the CAS out of the engine and leave the elect plug on it.
Pull the small white, two wire connector off the Lead coil assy. Backprobe the black/yellow wire in that plug.
Turn the CAS by hand while watching the meter (key On, engine OFF). See how many 0-5 signals you see when turning one full turn. Matters not which direction you spin the CAS, same results.
Each time the meter goes from 0vdc to 5vdc you should get a firing and you should see that four times when doing this.
Let's say you see four trigger signals (5vdc shows up). Then it isn't the ECU or wiring or CAS as the problem, it's further downsteam i.e. coils assy.
On a series four car, the wires b/t the coils and the ECU are a straight shot with no connector inbetween at all. On a series five that is NOT the case.
MY guess is that those wires are ok. Now the CAS four wires have a connector b/t the CAS and the ECU. Make SURE this connector is in place and connected together properly and also ohm out the CAS wires from the ECU plug to the CAS plug and while there make sure none of those four wires is going to gnd (both ECU plug and CAS plugs disconnected doing so).
The plug that is inbetween the CAS and ECU is called FE-04 (front harness to engine harness)
and if memory serves is somewhere below the brake booster/master cylinder area.
Also answer this.................when you get in the car and stare at the tach needle.....does the tach needle make one bump upwards when the key is initially turned to just ON???? Should.
Series our TURBO EM harness in a NON TURBO car???? Yes or no. Yes from what I understand. How did you handle the alternator wiring if that is the case. How did you handle the boost sensor wiring that is different than the non turbo vs the turbo em harness?
Nothing wrong with stk Mazda RX wiring at all in general, if someone has not buggered up the connectors.
http://rx7.pw.cx/guides_manuals/coll...ystifying.html
Pull the CAS out of the engine and leave the elect plug on it.
Pull the small white, two wire connector off the Lead coil assy. Backprobe the black/yellow wire in that plug.
Turn the CAS by hand while watching the meter (key On, engine OFF). See how many 0-5 signals you see when turning one full turn. Matters not which direction you spin the CAS, same results.
Each time the meter goes from 0vdc to 5vdc you should get a firing and you should see that four times when doing this.
Let's say you see four trigger signals (5vdc shows up). Then it isn't the ECU or wiring or CAS as the problem, it's further downsteam i.e. coils assy.
On a series four car, the wires b/t the coils and the ECU are a straight shot with no connector inbetween at all. On a series five that is NOT the case.
MY guess is that those wires are ok. Now the CAS four wires have a connector b/t the CAS and the ECU. Make SURE this connector is in place and connected together properly and also ohm out the CAS wires from the ECU plug to the CAS plug and while there make sure none of those four wires is going to gnd (both ECU plug and CAS plugs disconnected doing so).
The plug that is inbetween the CAS and ECU is called FE-04 (front harness to engine harness)
and if memory serves is somewhere below the brake booster/master cylinder area.
Also answer this.................when you get in the car and stare at the tach needle.....does the tach needle make one bump upwards when the key is initially turned to just ON???? Should.
Series our TURBO EM harness in a NON TURBO car???? Yes or no. Yes from what I understand. How did you handle the alternator wiring if that is the case. How did you handle the boost sensor wiring that is different than the non turbo vs the turbo em harness?
Nothing wrong with stk Mazda RX wiring at all in general, if someone has not buggered up the connectors.
http://rx7.pw.cx/guides_manuals/coll...ystifying.html
03-14-12, 11:20 AM
#30
Rotary Freak
******* Therefore, and this is important, in one eccentric shaft (crank) revolution, an ignition event occurs every 180 crank degrees.********
The above from the attachment in my other post above.
And we know the CAS rotates at 1/2 eccentric shaft speed............so in my mind four firing events with one full CAS rotation is normal and makes sense.
And just in case.........either of the coil assys MUST have at least one of their attach fasterners in place. The ignitor in each pack gets it's gnd from the body of the coil assy touching the chassis for a gnd point. Also the battery neg cable has a splice off it that attaches just at the base of the left front strut tower.This is the main CHASSIS gnd point on the car.
The above from the attachment in my other post above.
And we know the CAS rotates at 1/2 eccentric shaft speed............so in my mind four firing events with one full CAS rotation is normal and makes sense.
And just in case.........either of the coil assys MUST have at least one of their attach fasterners in place. The ignitor in each pack gets it's gnd from the body of the coil assy touching the chassis for a gnd point. Also the battery neg cable has a splice off it that attaches just at the base of the left front strut tower.This is the main CHASSIS gnd point on the car.
03-14-12, 12:21 PM
#31
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its not a ton of money to build a mega squirt. aaron has a write-up. also. maybe go crazy and run some grounds. id hit the fire wall, alt bracket, keg, maybe one on the frame somewhere. had a towncar once....kept blowing throttle cables...after the 3rd cable i figured out that the throttle cable was the best ground to the fire wall....from that day i hook up grounds everywhere. better safe than pissed.
Last edited by durtled; 03-14-12 at 12:25 PM.
03-14-12, 04:10 PM
#33
Rotary Freak
Ok. But remember that turbo and non turbo EM harness wiring does not match up unless steps are taken to make them match up.
And were the harnesses on the left side of the engine changed out for any reason?
Also..........on non turbo the alt wires are in the EM harness and on a Turbo car the alt wires are in the ENGINE harness on the left side of the engine. So the question is......is the two wire plug meant for the altenator in the EM harness connected to ANYTHING at all? That plug has one black/white wire and one white/black wire.
And were the harnesses on the left side of the engine changed out for any reason?
Also..........on non turbo the alt wires are in the EM harness and on a Turbo car the alt wires are in the ENGINE harness on the left side of the engine. So the question is......is the two wire plug meant for the altenator in the EM harness connected to ANYTHING at all? That plug has one black/white wire and one white/black wire.
03-14-12, 04:18 PM
#34
******* Therefore, and this is important, in one eccentric shaft (crank) revolution, an ignition event occurs every 180 crank degrees.********
The above from the attachment in my other post above.
And we know the CAS rotates at 1/2 eccentric shaft speed............so in my mind four firing events with one full CAS rotation is normal and makes sense.
And just in case.........either of the coil assys MUST have at least one of their attach fasterners in place. The ignitor in each pack gets it's gnd from the body of the coil assy touching the chassis for a gnd point. Also the battery neg cable has a splice off it that attaches just at the base of the left front strut tower.This is the main CHASSIS gnd point on the car.
The above from the attachment in my other post above.
And we know the CAS rotates at 1/2 eccentric shaft speed............so in my mind four firing events with one full CAS rotation is normal and makes sense.
And just in case.........either of the coil assys MUST have at least one of their attach fasterners in place. The ignitor in each pack gets it's gnd from the body of the coil assy touching the chassis for a gnd point. Also the battery neg cable has a splice off it that attaches just at the base of the left front strut tower.This is the main CHASSIS gnd point on the car.
The FSM does have a voltage pinout section for using the breakout box, but a multimeter works the exact same.... just a little slower. Do NOT use a test light, you'll blow stuff up inside the ecu. If you have one, use a logic probe, they're great.
Like I said, if it's not fixed by next weekend, I may be able to drop by and take a look.
-Green
03-14-12, 05:53 PM
#35
Rotary Freak
OOOOPS. I made a big mistake in my posts above. I should have written to backprobe the small white two wire Lead coil plug and backprobe the GREEN/yELLOW wire in that plug NOT the black/yellow (batt voltage with key ON).
I feel the problem lies in the fact you have a non turbo EM harness mated with the Turbo Front harness. Need answers to questions posed in my other posts to try to help out.
I feel the problem lies in the fact you have a non turbo EM harness mated with the Turbo Front harness. Need answers to questions posed in my other posts to try to help out.
03-15-12, 05:24 AM
#38
Rotary Freak
03-19-12, 08:30 PM
#41
Start unplugging sensors to see if you get spark when spinning the CAS. It really is worth a shot.
http://www.rotaryheads.com/PDF/2nd_g...tems_turbo.pdf
^Page 32 gives standard voltages for ecu pins.
http://www.rotaryheads.com/PDF/2nd_g...tems_turbo.pdf
^Page 32 gives standard voltages for ecu pins.
03-21-12, 06:45 PM
#49
Rotary Freak
The EGI fuses supply power to the coils via the main relay, and the EGI fuses also supply power to the ECU which in turn supplys the trigger signal to the coil ignitors when the CAS signals to the ECU are correct.
EGI INJ fuse supplies power to the individual injectors and coil assys, just like the jpg I attached a number of threads ago show.
EGI COMP supplys power to the ECU and also the numerous solenoids on the engine.
The CAS signal to the ECU determines when each injector fires and when each coil fires.
EGI INJ fuse supplies power to the individual injectors and coil assys, just like the jpg I attached a number of threads ago show.
EGI COMP supplys power to the ECU and also the numerous solenoids on the engine.
The CAS signal to the ECU determines when each injector fires and when each coil fires.